若选择不对CLR类型定义外键,但希望指定它在在数据库中应使用的名称 Eg:modelBuilder.Entity<Course>().HasRequired(c=>c.Department).WithMany(t => t.Courses).Map(m => m.MapKey("ChangedDepartmentID")); 2) 配置组合外键 当在Department类中定义的是DepartmentID和Name字段组合的主键时,在Course表中定义...
在Main方法入口中,我们首先需要创建一个ModelBuilder,使用它我们才能使用Configuration类和创建一个Model,接着创建Object。 Ok,有个model后,就可以借助上面的BookCatalog来创建数据库,被就行数据操作: 从代码中可以看到model首先是创建了一个ObjectContext,然后这个context去判断给数据库是否存在(CodeFirstWalkthrough),不存...
So, using these four tables, I expected Entity Framework to generate models that would allow me to simply execute and run in my MVC project, but it fails upon saving due to a Foreign Key Constraint. If I set the ParentID = Album.ID, then it complains that Artist.ID is NULL, and vis...
modelBuilder.Entity<Transaction>( ) .HasKey( x => x.TransactionId ) .ToTable( "Transactions" ); modelBuilder.Entity<Transaction>( ) .HasOptional( x => x.Order ) .WithMany( ) .HasForeignKey( t => t.OrderId ); modelBuilder.Entity<Order>( ) .HasKey( o => o.Id ) .ToTable("Ord...
Entity Framework Core3.0, 3.1, 5.0, 6.0, 7.0, 8.0, 9.0 HasForeignKey(String[]) Source: OwnershipBuilder%60.cs 配置属性 () 用作此关系的外键。 C# publicvirtualMicrosoft.EntityFrameworkCore.Metadata.Builders.OwnershipBuilder<TEntity,TDependentEntity>HasForeignKey(paramsstring[] foreignKe...
Jon, Generating a database from a model is a supported scenario in the next version of the Entity Framework (.NET 4.0) see the post on "Model First" on this blog. As for your other concerns and questions. we know we didn't get everything right in .NET 3.5, but we are listening ...
在前面几篇介绍了Entity Framework 实体框架的形成过程,整体框架主要是基于Database First的方式构建,也就是利用EDMX文件的映射关系,构建表与表之间的关系,这种模式弹性好,也可以利用图形化的设计器来设计表之间的关系,是开发项目较多采用的模式,不过问题还是这个XML太过复杂,因此有时候也想利用Code First模式构建整个框...
Foreign Key Support in EF 4.0 Model First with EF 4.0 Custom Code Generation with EF 4.0 Show 9 more April 2010 Volume 25 Number 04 Visual Studio - Entity Framework 4.0 and WCF Data Services 4.0 in Visual Studio 2010 By Elisa Flasko | April 2010 Among its many new improvements, Vi...
包: Microsoft.EntityFrameworkCore v8.0.0 在最终确定模型时调用。 C# 复制 public virtual void ProcessModelFinalizing (Microsoft.EntityFrameworkCore.Metadata.Builders.IConventionModelBuilder modelBuilder, Microsoft.EntityFrameworkCore.Metadata.Conventions.IConventionContext<Microsoft...
protected virtual void ForeignKeyConstraint (Microsoft.EntityFrameworkCore.Migrations.Operations.AddForeignKeyOperation operation, Microsoft.EntityFrameworkCore.Metadata.IModel? model, Microsoft.EntityFrameworkCore.Migrations.MigrationCommandListBuilder builder); 参数 operation AddForeignKeyOperation 操...