How to extend DbContext with partial class and partial OnModelCreating method in EntityFramework Core

How to extend DbContext with partial class and partial OnModelCreating method in EntityFramework Core

To extend DbContext using a partial class in Entity Framework Core, you can define a partial class in the same namespace and assembly as the DbContext. In the partial class, you can add new properties, methods, or override existing methods such as OnModelCreating.

Here is an example of how to extend a DbContext using a partial class:

// Original DbContext class public class MyDbContext : DbContext { public DbSet<User> Users { get; set; } protected override void OnModelCreating(ModelBuilder modelBuilder) { // configure the model } } // Partial class to extend MyDbContext public partial class MyDbContext { public DbSet<Product> Products { get; set; } // override OnModelCreating protected override void OnModelCreating(ModelBuilder modelBuilder) { base.OnModelCreating(modelBuilder); // add additional configurations for the model } }

In the above example, MyDbContext is the original DbContext class that defines a DbSet<User> and an OnModelCreating method. In the partial class MyDbContext, we have added a new DbSet<Product> and overridden the OnModelCreating method to add additional configurations for the model.

It is important to note that the partial class must be defined in the same namespace and assembly as the original DbContext class.

Examples

  1. C# Entity Framework Core extend DbContext with partial class

    Description: This query is asking for a basic example of extending an Entity Framework Core DbContext using a partial class.

    // Original DbContext in generated file public partial class MyDbContext : DbContext { // Existing DbContext code } // Extended DbContext in another file public partial class MyDbContext { // Additional members or methods }

  2. C# Entity Framework Core extend OnModelCreating method with partial class

    Description: This query is interested in code examples demonstrating how to extend the OnModelCreating method of an Entity Framework Core DbContext using a partial method.

    // Original DbContext in generated file public partial class MyDbContext : DbContext { protected override void OnModelCreating(ModelBuilder modelBuilder) { // Existing OnModelCreating logic } } // Extended DbContext in another file public partial class MyDbContext { partial void OnModelCreatingPartial(ModelBuilder modelBuilder) { // Additional OnModelCreating logic } }

  3. C# Entity Framework Core extend DbContext with custom entity configuration

    Description: This query is asking how to extend an Entity Framework Core DbContext using a partial class and include custom entity configurations.

    // Original DbContext in generated file public partial class MyDbContext : DbContext { protected override void OnModelCreating(ModelBuilder modelBuilder) { // Existing OnModelCreating logic } } // Extended DbContext in another file public partial class MyDbContext { partial void OnModelCreatingPartial(ModelBuilder modelBuilder) { // Additional custom entity configurations modelBuilder.ApplyConfiguration(new CustomEntityConfiguration()); } } // Custom entity configuration class public class CustomEntityConfiguration : IEntityTypeConfiguration<CustomEntity> { public void Configure(EntityTypeBuilder<CustomEntity> builder) { // Custom entity configuration logic } }

  4. C# Entity Framework Core extend DbContext with seed data

    Description: This query is interested in code examples where an Entity Framework Core DbContext is extended to include seed data using a partial class.

    // Original DbContext in generated file public partial class MyDbContext : DbContext { protected override void OnModelCreating(ModelBuilder modelBuilder) { // Existing OnModelCreating logic } } // Extended DbContext in another file public partial class MyDbContext { partial void OnModelCreatingPartial(ModelBuilder modelBuilder) { // Additional seed data logic modelBuilder.Entity<SeedEntity>().HasData(new SeedEntity { Id = 1, Name = "SeedData" }); } }

  5. C# Entity Framework Core extend DbContext with custom conventions

    Description: This query is asking how to extend an Entity Framework Core DbContext with custom conventions using a partial class.

    // Original DbContext in generated file public partial class MyDbContext : DbContext { protected override void OnModelCreating(ModelBuilder modelBuilder) { // Existing OnModelCreating logic } } // Extended DbContext in another file public partial class MyDbContext { partial void OnModelCreatingPartial(ModelBuilder modelBuilder) { // Additional custom conventions modelBuilder.Conventions.Add(new CustomConvention()); } } // Custom convention class public class CustomConvention : IConvention { // Custom convention logic }

  6. C# Entity Framework Core extend DbContext with query filters

    Description: This query is interested in code examples where an Entity Framework Core DbContext is extended with query filters using a partial class.

    // Original DbContext in generated file public partial class MyDbContext : DbContext { protected override void OnModelCreating(ModelBuilder modelBuilder) { // Existing OnModelCreating logic } } // Extended DbContext in another file public partial class MyDbContext { partial void OnModelCreatingPartial(ModelBuilder modelBuilder) { // Additional query filter logic modelBuilder.Entity<FilteredEntity>().HasQueryFilter(e => e.IsActive); } }

  7. C# Entity Framework Core extend DbContext with global filters

    Description: This query is asking how to extend an Entity Framework Core DbContext with global filters using a partial class.

    // Original DbContext in generated file public partial class MyDbContext : DbContext { protected override void OnModelCreating(ModelBuilder modelBuilder) { // Existing OnModelCreating logic } } // Extended DbContext in another file public partial class MyDbContext { partial void OnModelCreatingPartial(ModelBuilder modelBuilder) { // Additional global filter logic modelBuilder.Entity<GlobalFilteredEntity>().HasQueryFilter(e => !e.IsDeleted); } }

  8. C# Entity Framework Core extend DbContext with owned types

    Description: This query is looking for code examples where an Entity Framework Core DbContext is extended with owned types using a partial class.

    // Original DbContext in generated file public partial class MyDbContext : DbContext { protected override void OnModelCreating(ModelBuilder modelBuilder) { // Existing OnModelCreating logic } } // Extended DbContext in another file public partial class MyDbContext { partial void OnModelCreatingPartial(ModelBuilder modelBuilder) { // Additional owned type logic modelBuilder.Entity<OwnerEntity>().OwnsOne(e => e.OwnedProperty); } }

  9. C# Entity Framework Core extend DbContext with custom conventions and configurations

    Description: This query is asking how to extend an Entity Framework Core DbContext with both custom conventions and custom entity configurations using a partial class.

    // Original DbContext in generated file public partial class MyDbContext : DbContext { protected override void OnModelCreating(ModelBuilder modelBuilder) { // Existing OnModelCreating logic } } // Extended DbContext in another file public partial class MyDbContext { partial void OnModelCreatingPartial(ModelBuilder modelBuilder) { // Additional custom conventions and configurations modelBuilder.Conventions.Add(new CustomConvention()); modelBuilder.ApplyConfiguration(new CustomEntityConfiguration()); } } // Custom convention class public class CustomConvention : IConvention { // Custom convention logic } // Custom entity configuration class public class CustomEntityConfiguration : IEntityTypeConfiguration<CustomEntity> { public void Configure(EntityTypeBuilder<CustomEntity> builder) { // Custom entity configuration logic } }

  10. C# Entity Framework Core extend DbContext with custom database schema

    Description: This query is interested in code examples where an Entity Framework Core DbContext is extended with a custom database schema using a partial class.

    // Original DbContext in generated file public partial class MyDbContext : DbContext { protected override void OnModelCreating(ModelBuilder modelBuilder) { // Existing OnModelCreating logic } } // Extended DbContext in another file public partial class MyDbContext { partial void OnModelCreatingPartial(ModelBuilder modelBuilder) { // Additional custom schema logic modelBuilder.HasDefaultSchema("CustomSchema"); } }

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firebase-cloud-messaging controllers delegates cryptoswift rs485 angular angular-validation operation multidimensional-array linker-scripts

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