Top 45+ Entity Framework Interview Questions and Answers
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45+ [REAL-TIME] Entity Framework Interview Questions and Answers

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Entity Framework (EF) is an Object-Relational Mapping (ORM) framework developed by Microsoft for .NET applications. It simplifies the interaction between a database and application code by allowing developers to work with database objects as if they were regular .NET objects.

1. What is Entity Framework (EF)?

Ans:

Entity Framework (EF) is a powerful and widely used Object-Relational Mapping (ORM) framework developed by Microsoft for .NET applications. It simplifies the development of data access layers by enabling developers to work with databases using strongly typed .NET objects, eliminating the need to write tedious and error-prone SQL queries manually. EF abstracts the underlying database schema, allowing developers to focus on business logic rather than database interactions.

2. What are the key components of the Entity Framework?

Ans:

  • DbContext: Represents a session with the database and provides APIs for querying, saving, and managing entities.
  • Entity Data Model (EDM): Defines the conceptual model of the data, including entities, relationships, and constraints.
  • Entity SQL: A query language similar to SQL but designed for querying entity data models.
  • LINQ to Entities: Enables querying EF data models using LINQ (Language Integrated Query).
  • EntityClient: Provides low-level APIs for interacting with the Entity Data Model.

3. What is the Code First approach in Entity Framework?

Ans:

Code First is an approach in Entity Framework that allows developers to define the domain model using Plain Old CLR Object (POCO) classes without any knowledge of the underlying database. The database schema is generated automatically based on the conventions or configurations specified in the code. This approach is ideal for scenarios where the database schema is not predefined or when developers prefer to work with domain models first.

4. What is the Database First approach in Entity Framework?

Ans:

  • Database First is an approach in Entity Framework where the entity classes and DbContext are generated based on an existing database schema. 
  • Developers start by creating a database schema using tools like SQL Server Management Studio or Visual Studio’s Entity Framework Designer. 
  • Then, EF generates the corresponding entity classes and DbContext, allowing developers to interact with the database using those classes.

5. What is the Model First approach in Entity Framework?

Ans:

Model First is an approach in Entity Framework where developers create the conceptual model using Entity Framework Designer in Visual Studio. The conceptual model defines entities, relationships, and constraints graphically. From this model, EF generates both the database schema and the entity classes. This approach is suitable for scenarios where the database design is more important than the application’s domain model.

6. What is DbContext in Entity Framework?

Ans:

  • DbContext is a fundamental class in Entity Framework that represents a session with the database and acts as a bridge between the domain classes (entities) and the database. 
  • It enables developers to query, insert, update, and delete entities and manage transactions. 
  • DbContext is part of the Entity Framework Core (EF Core) and replaces the ObjectContext used in previous versions of EF.

7. What is ObjectContext in Entity Framework?

Ans:

Aspect Advantages Disadvantages
Rapid Development Quick generation of entity classes and DbContext from an existing database schema. Generated code might be cluttered and difficult to maintain if the database schema changes frequently.
Easy Integration Seamless integration with existing databases and legacy systems. Limited control over the generated code and mapping.
Mature Database Design Can leverage existing database design and stored procedures. Dependency on the underlying database schema, which might not always align with application requirements.
Design Consistency Ensures consistency between the application’s data model and the database schema. Difficulty in unit testing due to tight coupling with the database.

8. What is an Entity Data Model (EDM)?

Ans:

Entity Data Model (EDM) is a conceptual model used by Entity Framework to describe the structure of data in terms of entities, relationships, and constraints. It provides a high-level abstraction of the underlying database schema, allowing developers to work with entities and relationships in a domain-centric way rather than focusing on database tables and columns.

9. What is lazy loading in Entity Framework?

Ans:

  • Lazy loading is a feature in Entity Framework that defers the loading of related entities until they are explicitly accessed. 
  • When an entity with navigation properties is retrieved from the database, EF does not load the related entities immediately. 
  • Instead, it generates additional SQL queries to load related entities when they are accessed for the first time. 
  • Lazy loading helps improve performance by only fetching related data when needed.

10. How can you turn off lazy loading in Entity Framework?

Ans:

Lazy loading can be turned off in Entity Framework by setting the LazyLoadingEnabled property of the DbContext or ObjectContext to false. By turning off lazy loading, EF will not automatically load related entities, and developers need to use eager loading or explicit loading to retrieve related data.

11. What is eager loading in Entity Framework?

Ans:

Eager loading is a technique in Entity Framework in which related entities are explicitly loaded from the database along with the main entity in a single query. Unlike lazy loading, where related entities are loaded on demand, eager loading fetches all related entities upfront, reducing the number of database round-trips and improving performance.

12. How can you perform eager loading in Entity Framework?

Ans:

  • Eager loading in Entity Framework can be achieved using the Include method or the Include extension method in LINQ queries. 
  • By specifying the navigation properties to be included in the query, EF retrieves the related entities along with the main entity in a single database query.

13. What is explicit loading in Entity Framework?

Ans:

Explicit loading is a technique in Entity Framework in which related entities are loaded from the database on demand, explicitly by the developer. Unlike lazy loading or eager loading, where associated entities are loaded automatically or eagerly, explicit loading gives developers more control over when and how associated entities are fetched from the database.

14. What is the difference between Add and Attach methods in Entity Framework?

Ans:

  • In Entity Framework, the Add method adds a new entity to the context and marks it as Added, indicating that it should be inserted into the database upon calling SaveChanges. 
  • On the other hand, the Attach method attaches an existing entity to the context. 
  • It marks it as Unchanged, indicating that the context already tracks it and should not be considered for insertion or update during SaveChanges.

15. What is the purpose of the EntityState enumeration in Entity Framework?

Ans:

The EntityState enumeration in Entity Framework tracks the state of entities being managed by the context. It represents different states, such as Added, Modified, Deleted, or Unchanged, indicating whether an entity is new, modified, deleted, or unchanged in the database.

16. What is a DbSet in Entity Framework?

Ans:

A DbSet in Entity Framework is a generic set of entities that represents a table or a collection of entities in the database. It provides methods for querying, adding, updating, and deleting entities of a specific type. DbSet is typically defined as a property in the DbContext class and corresponds to a database table or view.

17. How can you execute raw SQL queries in Entity Framework?

Ans:

  • Entity Framework allows developers to execute raw SQL queries against the database using the SqlQuery method or the ExecuteSqlCommand method provided by the DbContext. 
  • These methods enable developers to execute parameterized SQL queries or execute database commands directly, bypassing EF’s entity tracking and object materialization features.

18. What is migration in Entity Framework?

Ans:

Migration in Entity Framework is a technique for managing database schema changes in the Code First approach. It enables developers to evolve the database schema over time while preserving the existing data. Migrations capture the changes made to the domain model and generate corresponding SQL scripts to update the database schema accordingly.

19. How can you enable migrations in Entity Framework?

Ans:

  • Migrations enable developers to manage database schema changes over time while preserving data integrity. 
  • To enable migrations in Entity Framework, you use the Enable-Migrations command in the Package Manager Console (PMC) within Visual Studio. 
  • This command initializes the migrations configuration for the project, allowing you to add and apply migrations.

20. What is the purpose of the Add-Migration command in Entity Framework?

Ans:

The Add-Migration command is used to scaffold a new migration based on the changes made to the model since the last migration. When you make changes to the domain model, such as adding new entities, modifying existing entities, or altering relationships, you use this command to generate a new migration file. This file contains the necessary code to update the database schema to reflect the changes in the model.

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    21. What is the purpose of the Update-Database command in Entity Framework?

    Ans:

    • The Update-Database command applies pending migrations to the database. 
    • Once you’ve added a new migration using the Add-Migration command, you use Update-Database to execute the migration and update the database schema accordingly. 
    • This command ensures that the database schema stays synchronized with the application’s domain model.

    22. What is a navigation property in Entity Framework?

    Ans:

    A navigation property in Entity Framework is a property on an entity class that represents a relationship to another entity. It allows you to navigate from one entity to another through defined relationships. For example, in a one-to-many relationship between Author and Book entities, the Author entity may have a navigation property called Books, which represents the collection of books authored by that author.

    23. What are the different types of relationships supported by Entity Framework?

    Ans:

    One-to-One: Each entity instance is associated with exactly one instance of another entity.

    One-to-Many: Each entity instance is associated with a collection of the cases of another entity.

    Many-to-Many: Each entity instance is associated with a collection of the cases of another entity, and vice versa.

    24. How can you configure relationships in Entity Framework Code First approach?

    Ans:

    Relationships in Entity Framework, Code First approach, can be configured using either Fluent API or data annotations. With Fluent API, you can define relationships and specify additional configuration options programmatically. Data annotations, on the other hand, allow you to configure relationships by adding attributes to the properties of your entity classes.

    25. What is the purpose of the ForeignKey attribute in Entity Framework?

    Ans:

    • The ForeignKey attribute is used in Entity Framework to specify the foreign key property in a relationship between two entities. 
    • By decorating a property with this attribute, you explicitly specify which property serves as the foreign key for a particular navigation property, providing EF with the necessary information to establish the relationship.

    26. What is the purpose of the InverseProperty attribute in Entity Framework?

    Ans:

    The InverseProperty attribute is used in Entity Framework to specify the navigation property on the other end of a relationship. When bidirectional associations exist between entities, the InverseProperty attribute helps EF identify the corresponding navigation property on the other entity, establishing the correct relationship between them.

    27. How can you configure inheritance in the Entity Framework Code First approach?

    Ans:

    • Table Per Hierarchy (TPH): In this strategy, all classes in the inheritance hierarchy are mapped to a single database table, and a discriminator column differentiates between different types.
    • Table Per Type (TPT): In the TPT strategy, each class in the inheritance hierarchy is mapped to its database table, with shared columns placed in a base table.
    • Table Per Concrete Type (TPC): The TPC strategy maps each class in the inheritance hierarchy to its database table without any shared columns, resulting in a more denormalized database schema.

    28. What is the purpose of the Discriminator column in Entity Framework?

    Ans:

    The Discriminator column is used in Entity Framework to differentiate between different types in a hierarchy when using inheritance mapping. It stores a value that indicates the type of entity in the database table, allowing EF to determine the appropriate type when retrieving data from the database and materializing entities.

    29. What is Change Tracking in Entity Framework?

    Ans:

    • Change Tracking in Entity Framework refers to the process of keeping track of changes made to entities in the context so that these changes can be persisted in the database. 
    • EF automatically detects changes made to entity properties and tracks their state, allowing you to save those changes to the database using the SaveChanges method.

    30. What does Entity Framework support the different Change Tracking modes?

    Ans:

    Automatic: EF automatically detects changes made to entities when SaveChanges is called.

    Snapshot: EF takes a snapshot of the entity state when it is first loaded and compares it with the current state to detect changes.

    Change Tracking Proxy: EF generates proxy classes that override property setters to track changes automatically.

    31. How can you disable Change Tracking in Entity Framework?

    Ans:

    Change Tracking can be turned off in Entity Framework by setting the AutoDetectChangesEnabled property of the DbContext to false. Disabling change tracking can improve performance in scenarios where automatic change detection is not needed, such as when executing read-only queries.

    32. What is Database First with EF Core?

    Ans:

    • The Database-First approach in Entity Framework Core involves generating entity classes and a DbContext from an existing database schema. 
    • With Database-First, you start by reverse-engineering an existing database, which creates entity classes and a DbContext that represents the database schema. 
    • You can then use these generated classes to interact with the database in your application.

    33. What is Code First with EF Core?

    Ans:

    Code First approach in Entity Framework Core allows developers to define the domain model using POCO (Plain Old CLR Object) classes, and the database is generated based on these classes. With Code First, you define your entity classes, configure relationships, and specify additional metadata using Fluent API or data annotations. EF Core then creates the database schema based on your model when the application is run.

    34. What are Shadow Properties in Entity Framework Core?

    Ans:

    • Shadow Properties in Entity Framework Core are properties that are not defined in the entity class but are used internally by EF Core to store additional information, such as foreign key values or other metadata. 
    • Shadow Properties are typically used in scenarios where you need to map a database column that does not have a corresponding property in the entity class.

    35. How can you configure Shadow Properties in Entity Framework Core?

    Ans:

    Shadow Properties can be configured using the Fluent API by specifying them as navigation properties or using the HasShadowProperty method in the OnModelCreating method of your DbContext class. By configuring shadow properties, you can map database columns to properties that are not explicitly defined in your entity classes.

    36. What is the purpose of Value Conversions in Entity Framework Core?

    Ans:

    • Value Conversions in Entity Framework Core serve as a bridge between the representation of data in the application and its storage in the database. 
    • They allow developers to customize how values are mapped between entity properties and database columns. 
    • For example, you can use value conversions to store enums as integers in the database or to serialize complex types to JSON strings for storage.

    37. How can you configure Value Conversions in Entity Framework Core?

    Ans:

    Value Conversions can be configured using the HasConversion method provided by the Fluent API in Entity Framework Core. This method allows you to specify conversion functions to transform property values when reading from or writing to the database. You can configure value conversions in the OnModelCreating method of your DbContext class, providing flexibility in how data is stored and retrieved.

    38. What is Query Tagging in Entity Framework Core?

    Ans:

    • Query Tagging in Entity Framework Core enables developers to attach custom data or metadata to queries for logging, tracking, or identification purposes. 
    • It allows you to tag queries with additional information that can be useful for debugging, performance monitoring, or auditing. 
    • For example, you can tag queries with user IDs, request IDs, or timestamps to trace their origin and impact.

    39. How can you configure Query Tagging in Entity Framework Core?

    Ans:

    Query Tagging can be configured using the WithTag method when executing queries in Entity Framework Core. This method allows you to attach a tag or metadata object to a query, which is then propagated throughout the query execution pipeline. You can use this feature to add context-specific information to questions and retrieve it later for analysis or logging purposes.

    40. What are Global Query Filters in Entity Framework Core?

    Ans:

    • Global Query Filters in Entity Framework Core allow developers to define filters that are automatically applied to all queries against a particular entity type. 
    • These filters act as predicates that restrict the results returned by queries, ensuring that only entities matching the specified criteria are retrieved from the database. 
    • Global query filters are useful for enforcing data access policies, implementing soft delete functionality, or applying row-level security.

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    41. How can you configure Global Query Filters in Entity Framework Core?

    Ans:

    Global Query Filters can be configured using the HasQueryFilter method in the OnModelCreating method of your DbContext class. This method allows you to specify a filter expression that defines the conditions for filtering entities of a particular type. Once configured, the global query filter is applied automatically to all queries targeting the specified entity type, ensuring consistent data access behavior across your application.

    42. What is the Owned Entity Type in Entity Framework Core?

    Ans:

    • The Owned Entity Type in Entity Framework Core allows developers to define complex types that are owned by another entity and do not have their own identity. 
    • These owned types are part of the owning entity and are stored inline within its table in the database rather than having separate tables. 
    • Owned types are typically used to represent value objects or components that are logically part of an entity but do not have a standalone identity.

    43. How can you configure Owned Entity Types in Entity Framework Core?

    Ans:

    Owned Entity Types can be configured using the OwnsOne or OwnsMany methods provided by the Fluent API in Entity Framework Core. These methods allow you to define owned types as navigation properties of the owning entity and specify their mappings to database columns. By configuring owned entity types, you can encapsulate complex data structures within entities and improve the organization and clarity of your domain model.

    44. What is the purpose of the Include method in Entity Framework?

    Ans:

    The Include method in Entity Framework eagerly loads related entities from the database along with the main entity in a single query. It allows you to specify navigation properties to be included in the query result, ensuring that related entities are fetched upfront rather than lazily loaded.

    45. What is the difference between eager loading and lazy loading in Entity Framework?

    Ans:

    • Eager loading retrieves related entities along with the main entity in a single query, reducing the number of database round-trips. 
    • In contrast, lazy loading defers the loading of related entities until they are accessed for the first time, which can lead to additional database queries being executed on-demand.

    46. How does Entity Framework handle transactions?

    Ans:

    • Entity Framework supports transactions through the DbContext class, allowing developers to perform atomic operations that either succeed or fail as a single unit. 
    • Transactions can be managed explicitly using the BeginTransaction, Commit, and Rollback methods or implicitly through the SaveChanges method, which wraps multiple operations in a transaction by default.

    47. What is the purpose of the Find method in Entity Framework?

    Ans:

    The Find method in Entity Framework retrieves an entity from the context by its primary key. It provides a convenient way to locate entities without explicitly writing LINQ queries, improving readability and reducing boilerplate code.

    48. What is the purpose of the Entry method in Entity Framework?

    Ans:

    The entry method in the Entity Framework provides access to an entity’s metadata and state information that is being tracked by the context. It allows developers to inspect and manipulate entities’ states, including marking them as added, modified, or deleted and accessing their original and current property values.

    49. What is database seeding in Entity Framework?

    Ans:

    • Database seeding in Entity Framework involves populating the database with initial data when the application is first deployed or when the database is created. 
    • It allows developers to prepopulate tables with default records, such as user accounts, reference data, or configuration settings, ensuring that the application starts with a consistent and predictable state.

    50. What is the purpose of the AsNoTracking method in Entity Framework?

    Ans:

    The AsNoTracking method in Entity Framework queries entities without tracking their changes in the context. It improves performance by bypassing change tracking mechanisms, which can be beneficial for read-only operations or when entities are not expected to be modified or persisted.

    51. What is the purpose of the ToListAsync method in Entity Framework?

    Ans:

    • The ToListAsync method in Entity Framework is used to asynchronously execute a query and retrieve the results as a list of entities. 
    • It allows developers to perform non-blocking database operations, improving scalability and responsiveness in applications that require asynchronous data retrieval.

    52. What is the purpose of the FromSqlRaw method in Entity Framework?

    Ans:

    The FromSqlRaw method in Entity Framework is used to execute raw SQL queries against the database and map the results to entity types. It provides a flexible way to leverage the power of SQL while still benefiting from entity tracking and materialization features offered by EF.

    53. What is the purpose of the ExecuteSqlRaw method in Entity Framework?

    Ans:

    • The ExecuteSqlRaw method in Entity Framework executes parameterized SQL commands against the database. 
    • Unlike query methods like FromSqlRaw, ExecuteSqlRaw is intended for executing non-query SQL commands, such as INSERT, UPDATE, DELETE, or stored procedure calls, which do not return entity results.

    54. What is the purpose of the RemoveRange method in Entity Framework?

    Ans:

    The RemoveRange method in Entity Framework deletes multiple entities from the context in a single operation. It provides a convenient way to batch-delete entities without the need for various database round-trips, improving performance and efficiency when dealing with large datasets.

    55. What is the purpose of the ValueGeneratedOnAddOrUpdate method in Entity Framework?

    Ans:

    The ValueGeneratedOnAddOrUpdate method in Entity Framework configures properties to be automatically populated with values generated by the database upon insertion or update. It allows developers to define properties such as timestamps or version numbers that are managed by the database, ensuring consistency and accuracy in concurrent environments.

    56. What is the purpose of the InMemory provider in Entity Framework Core?

    Ans:

    • The InMemory provider in Entity Framework Core allows developers to create an in-memory database for testing or prototyping purposes. 
    • It simulates a relational database entirely in memory, providing fast and lightweight data access without the need for an external database server.

    57. What is the purpose of the AsSplitQuery method in Entity Framework Core?

    Ans:

    The AsSplitQuery method in Entity Framework Core splits a query into multiple SQL queries to fetch related data separately. This can improve performance by reducing the amount of data retrieved from the database and optimizing the execution of complex queries.

    58. What is the purpose of the UseLazyLoadingProxies method in Entity Framework Core?

    Ans:

    • The UseLazyLoadingProxies method in Entity Framework Core enables lazy loading for navigation properties on entity classes. 
    • EF Core dynamically generates lazy loading proxies to transparently load related entities from the database when accessed for the first time, allowing for more efficient resource use and improved performance.

    59. What is the purpose of the EnsureCreated method in Entity Framework Core?

    Ans:

    The EnsureCreated method in Entity Framework Core ensures that the database schema corresponding to the context’s model is created in the database. It is primarily intended for development and testing scenarios where automatic migrations are not desired, providing a quick way to create the database schema based on the current model.

    60. What is the purpose of the EnsureDeleted method in Entity Framework Core?

    Ans:

    • The EnsureDeleted method in Entity Framework Core ensures that the database corresponding to the context’s model is deleted from the database server. 
    • It is often used in conjunction with the EnsureCreated method to recreate the database from scratch, allowing for a clean slate when testing or debugging.
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    61. What is the purpose of the ModelSnapshot file in Entity Framework Core?

    Ans:

    The ModelSnapshot file in Entity Framework Core is an automatically generated code file that represents the snapshot of the current state of the model. It contains metadata about the entities, their properties, and the relationships between them, serving as a reference for migrations and database schema generation.

    62. What is the purpose of the AsNoTrackingWithIdentityResolution method in Entity Framework Core?

    Ans:

    The AsNoTrackingWithIdentityResolution method in Entity Framework Core executes a query without tracking changes to entities while still ensuring that entities with the same key are returned as the same instance. It combines the benefits of no-tracking queries and identity resolution, providing predictable behavior when querying entities with relationships.

    63. What is the purpose of the UseQuerySplittingBehavior method in Entity Framework Core?

    Ans:

    • The UseQuerySplittingBehavior method in Entity Framework Core is used to configure how queries are split when querying entity types with inheritance hierarchies. 
    • It allows developers to specify whether queries should be divided into separate SQL statements for each derived type or combined into a single SQL statement for better performance and efficiency.

    64. What is the purpose of the HasData method in Entity Framework Core migrations?

    Ans:

    The HasData method in Entity Framework Core migrations seeds initial data into the database during migration operations. It allows developers to specify data that should be inserted into tables when the database schema is created or updated, ensuring that the database starts with predefined records.

    65. What is the purpose of the HasAnnotation method in Entity Framework Core?

    Ans:

    • The HasAnnotation method in Entity Framework Core attaches custom annotations or metadata to various model elements, such as entities, properties, relationships, or indexes. 
    • Annotations provide additional information about the model that EF Core or third-party libraries can use for various purposes, such as code generation, serialization, or documentation.

    66. What is the purpose of the Detach method in Entity Framework Core?

    Ans:

    The Detach method in Entity Framework Core is used to detach an entity from the context, effectively removing it from being tracked for changes. This method is useful when you want to stop tracking changes to an entity or when you want to prevent an entity from being persisted in the database.

    67. What is the purpose of the Local property in Entity Framework Core?

    Ans:

    The local property in Entity Framework Core provides access to the local cache of entities tracked by the context. It allows you to enumerate and manipulate entities that have been loaded into memory without executing additional database queries.

    68. What is the purpose of the Entry? State property in Entity Framework Core?

    Ans:

    • The Entry. State property in Entity Framework Core represents the state of an entity being tracked by the context. 
    • It indicates whether the entity is new, modified, deleted, or unchanged, providing information about how the entity will be handled when changes are saved to the database.

    69. What is the purpose of the ChangeTracker property in Entity Framework Core?

    Ans:

    The ChangeTracker property in Entity Framework Core provides access to the context’s change-tracking functionality. It allows you to inspect and manipulate the state of entities being tracked, including querying pending changes, attaching/detaching entities, and controlling change-tracking behavior.

    70. What is the purpose of the ToQueryString method in Entity Framework Core?

    Ans:

    • The ToQueryString method in Entity Framework Core is used to generate the SQL query corresponding to a LINQ query or IQueryable expression. 
    • It allows you to inspect the generated SQL code for debugging or optimization purposes, providing visibility into how EF Core translates LINQ queries into SQL statements.

    71. What is the purpose of the conversion method in Entity Framework Core migrations?

    Ans:

    The conversion method in Entity Framework Core migrations configures value conversions for properties when generating or applying migrations. It allows you to specify conversion functions to transform property values between the application and database representations, ensuring compatibility between different data types.

    72. What is the purpose of the UseSqlServer method in Entity Framework Core?

    Ans:

    • The UseSqlServer method in Entity Framework Core configures the context to use SQL Server as the underlying database provider. 
    • It specifies the connection string and other options required to establish a connection to the SQL Server database instance, enabling data access operations using EF Core.

    73. What is the purpose of the UseInMemoryDatabase method in Entity Framework Core?

    Ans:

    The UseInMemoryDatabase method in Entity Framework Core configures the context to use an in-memory database provider for testing or prototyping purposes. It creates an in-memory database instance that persists only for the application’s lifetime, allowing for fast and lightweight data access without the need for an external database server.

    74. What is the purpose of the AsQueryable method in Entity Framework Core?

    Ans:

    • The AsQueryable method in Entity Framework Core is used to convert an IEnumerable collection or a DbSet into an IQueryable queryable collection. 
    • It allows you to compose LINQ queries dynamically and apply additional query operators before executing the query against the database.

    75. What is the purpose of the UseLazyLoading method in Entity Framework Core?

    Ans:

    The UseLazyLoading method in Entity Framework Core is used to enable lazy loading for navigation properties on entity classes. When lazy loading is enabled, related entities are automatically loaded from the database when accessed for the first time, helping to minimize the amount of data fetched from the database upfront.

    76. What is the purpose of the FindAsync method in Entity Framework Core?

    Ans:

    • The FindAsync method in Entity Framework Core is an asynchronous version of the Find method, which retrieves an entity from the context by its primary key. 
    • It allows for non-blocking database operations when fetching entities, improving performance and scalability in asynchronous applications.

    77. What is the purpose of the UseLazyLoadingProxies method in Entity Framework Core?

    Ans:

    The UseLazyLoadingProxies method in Entity Framework Core enables lazy loading for navigation properties on entity classes. EF Core dynamically generates lazy loading proxies to transparently load related entities from the database when accessed for the first time, allowing for more efficient resource use and improved performance.

    78. What is the purpose of the ValueGeneratedOnAddOrUpdate method in Entity Framework Core?

    Ans:

    • The ValueGeneratedOnAddOrUpdate method in Entity Framework Core is used to configure properties to be automatically populated with values generated by the database upon insertion or update. 
    • It allows developers to define properties such as timestamps or version numbers that are managed by the database, ensuring consistency and accuracy in concurrent environments.

    79. What is the purpose of the ApplyConfiguration method in Entity Framework Core?

    Ans:

    The ApplyConfiguration method in Entity Framework Core applies entity-type configurations defined in separate configuration classes to the model. It allows developers to organize and modularize their model configuration by separating it into individual courses, improving code maintainability and readability.

    80. What is the purpose of the UseQueryTrackingBehavior method in Entity Framework Core?

    Ans:

    • The UseQueryTrackingBehavior method in Entity Framework Core configures the context’s query-tracking behavior. 
    • It allows developers to specify whether queries should track changes to entities or not, providing flexibility in managing the performance and behavior of data access operations.
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    81. What is the purpose of the GetDatabaseValuesAsync method in Entity Framework Core?

    Ans:

    The GetDatabaseValuesAsync method in Entity Framework Core asynchronously retrieves an entity’s current values from the database. It allows developers to compare the current database values with the original values of the entity being tracked, facilitating optimistic concurrency control and conflict resolution.

    82. What is the purpose of the IsConcurrencyToken attribute in Entity Framework Core?

    Ans:

    • The IsConcurrencyToken attribute in Entity Framework Core is used to specify that a property should be included in concurrency checks when updating entities. 
    • It marks the property as a concurrency token, allowing EF Core to detect and handle concurrent updates to the same entity by multiple users or processes.

    83. What is the purpose of the UseSnakeCaseNamingConvention method in Entity Framework Core?

    Ans:

    The UseSnakeCaseNamingConvention method in Entity Framework Core configures the naming convention for database objects to use the snake_case naming style. It converts entity and property names to lowercase and separates words with underscores when generating database tables, columns, and constraints, ensuring consistency with database naming conventions.

    84. What is the purpose of the AsTracking method in Entity Framework Core?

    Ans:

    • The AsTracking method in Entity Framework Core enables change tracking for entities returned by a query. 
    • It ensures that any changes made to the entities are tracked by the context, allowing for automatic modification detection and synchronization with the database when changes are saved.

    85. What is the purpose of the UseSqlite method in Entity Framework Core?

    Ans:

    The UseSqlite method in Entity Framework Core configures the context to use SQLite as the underlying database provider. It specifies the connection string and other options required to establish a connection to the SQLite database file, enabling data access operations using EF Core with SQLite databases.

    86. What is the purpose of the AsNoTracking method in Entity Framework Core?

    Ans:

    • The AsNoTracking method in Entity Framework Core is used to execute a query without tracking changes to entities. 
    • This can improve performance when entities are read-only or when changes to entities are not expected to persist in the database.

    87. What is the purpose of the ConfigureWarnings method in Entity Framework Core?

    Ans:

    The ConfigureWarnings method in Entity Framework Core configures how the context handles warnings. It allows developers to suppress or configure warnings generated by EF Core during query execution, migration generation, or other operations.

    88. What is the purpose of the UseLazyLoadingProxies method in Entity Framework Core?

    Ans:

    • The UseLazyLoadingProxies method in Entity Framework Core enables lazy loading for navigation properties on entity classes. 
    • EF Core dynamically generates lazy loading proxies to load related entities from the database when accessed for the first time, improving performance and resource usage.

    89. What is the purpose of the ExecuteSqlCommand method in Entity Framework Core?

    Ans:

    The ExecuteSqlCommand method in Entity Framework Core is used to execute raw SQL commands against the database. It allows developers to execute SQL commands such as INSERT, UPDATE, DELETE, or stored procedures directly, bypassing EF Core’s query translation mechanisms.

    90. What is the purpose of the UseQueryTrackingBehavior method in Entity Framework Core?

    Ans:

    • The UseQueryTrackingBehavior method in Entity Framework Core configures the context’s default query-tracking behavior. 
    • It allows developers to specify whether queries should track changes to entities by default or not, providing control over how entities are tracked during data access operations.

    91. What is the purpose of the UseSnakeCaseNamingConvention method in Entity Framework Core?

    Ans:

    The UseSnakeCaseNamingConvention method in Entity Framework Core configures the naming convention for database objects to use the snake_case naming style. It converts entity and property names to lowercase and separates words with underscores when generating database tables, columns, and constraints.

    92. What is the purpose of the AsSplitQuery method in Entity Framework Core?

    Ans:

    The AsSplitQuery method in Entity Framework Core is used to split a query into multiple SQL queries to fetch related data separately. This can improve performance by reducing the amount of data fetched from the database and optimizing the execution of complex queries.

    93. What is the purpose of the UseQueryCache method in Entity Framework Core?

    Ans:

    • The UseQueryCache method in Entity Framework Core is used to enable query caching for queries executed by the context. 
    • It allows EF Core to cache query results in memory, improving performance by avoiding redundant database round-trips for identical queries.

    94. What is the purpose of the HasData method in Entity Framework Core migrations?

    Ans:

    The HasData method in Entity Framework Core migrations seeds initial data into the database during migration operations. It allows developers to specify data that should be inserted into tables when the database schema is created or updated, ensuring that the database starts with predefined records.

    95. What is the purpose of the ApplyConfiguration method in Entity Framework Core?

    Ans:

    • The ApplyConfiguration method in Entity Framework Core applies entity-type configurations defined in separate configuration classes to the model. 
    • It allows developers to organize and modularize their model configuration by separating it into individual courses, improving code maintainability and readability.

    96. What is the purpose of the ValueGeneratedOnAdd method in Entity Framework Core?

    Ans:

    The ValueGeneratedOnAdd method in Entity Framework Core is used to configure properties to be automatically populated with values generated by the database upon insertion. It specifies that the property value is generated only when a new entity is added to the database, ensuring that the property remains unchanged during updates.

    97. What is the purpose of the UseQueryHint method in Entity Framework Core?

    Ans:

    • The UseQueryHint method in Entity Framework Core provides query hints to the underlying database provider. 
    • It allows developers to specify hints or directives that influence the execution plan of SQL queries, such as index hints or query optimizer directives, to improve query performance.

    98. What is the purpose of the UseApplicationServiceProvider method in Entity Framework Core?

    Ans:

    The UseApplicationServiceProvider method in Entity Framework Core configures the context to use the application’s service provider for dependency injection. It allows developers to specify the service provider to be used by EF Core to resolve dependencies required during data access operations.

    99. What is the purpose of the UseRelationalNulls method in Entity Framework Core?

    Ans:

    • The UseRelationalNulls method in Entity Framework Core configures how the underlying relational database provider handles null values. 
    • It specifies whether database null values should be treated as database nulls or CLR nulls, affecting how null comparisons and operations are performed in queries.

    100. What is the purpose of the UseQuerySplittingBehavior method in Entity Framework Core?

    Ans:

    The UseQuerySplittingBehavior method in Entity Framework Core is used to configure how queries are split when querying entity types with inheritance hierarchies. It allows developers to specify whether queries should be divided into separate SQL statements for each derived type or combined into a single SQL statement for better performance and efficiency.

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