Question

我正在尝试实现IEntityTypeConfiguration，我可以将其重新用于配置扩展实体：

<form class="form" method="POST" action="index.php" onsubmit="return checkval(event);">

  <input class="form-check-input" type="checkbox" value="" name="gdpr" id="gdpr_privacy">


  <input class="btn btn-primary btn-block" type="submit" name="submit" placeholder="Send" id="submit"></input>

</form>

获取错误：

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

public partial class Foo : IFoo
{
    public long Id { get; set; }
    public virtual Bar Bar { get; set; }
}

public interface IFoo
{
    long Id { get; set; }
    Bar Bar { get; set; }
}

public partial class Bar
{
    public long Id { get; set; }
    public long FooId { get; set; }
    public virtual IFoo Foo { get; set; }
}

public class FooConfig<TEntity> : IEntityTypeConfiguration<TEntity> where TEntity : class, IFoo
{
    public void Configure(EntityTypeBuilder<TEntity> builder)
    {
        builder.HasKey(e => e.Id);
        builder.HasOne(e => e.Bar)
            .WithOne(e => e.Foo);
    }
}

有什么方法可以“愚弄” lambda或构造FooConfig以便代码可以编译？从逻辑上讲，如果我使FooConfig为非通用的，我相信代码是正确的并且可以按预期进行编译和运行：

Error   CS0266  Cannot implicitly convert type 'IFoo' to 'TEntity'. An explicit conversion exists (are you missing a cast?)
Error   CS1662  Cannot convert lambda expression to intended delegate type because some of the return types in the block are not implicitly convertible to the delegate return type

但是当我使用实际实体时，我无法覆盖Configure方法：

public class FooConfigNonGeneric : IEntityTypeConfiguration<IFoo>
{
    public void Configure(EntityTypeBuilder<IFoo> builder)
    {
        builder.HasKey(e => e.Id);
        builder.HasOne(e => e.Bar)
            .WithOne(e => e.Foo);
    }
}

错误：

public partial class FooExtended : Foo
{
    public string AnotherProperty { get; set; }
}

public class FooExtendedConfig: FooConfigNonGeneric
{
    public override void Configure(EntityTypeBuilder<FooExtended> builder)
    {
        base.Configure(builder);
    }
}

实现通用的IEntityTypeConfiguration

0 个答案: