为什么我的课没有通过反射被接走

我正在尝试创建一个单元测试来验证我加载AutoMapper配置的方法是否正确工作。我加载AutoMapper配置的想法是将配置调用放在具有以下接口的类中:

public interface IEntityMapConfiguration
{
    void ConfigureMapping();
}

为了动态加载这些文件，我使用以下加载器类

public class EntityMapLoader
{
    public static void LoadEntityMappings()
    {
        // Load all IEntityMapConfiguration classes via reflection
        var types = AppDomain.CurrentDomain
                             .GetAssemblies()
                             .SelectMany(x => x.GetTypes())
                             .Where(x => x.IsSubclassOf(typeof(IEntityMapConfiguration)))
                             .Select(x => x as IEntityMapConfiguration)
                             .ToList();
        foreach (var config in types)
            config.ConfigureMapping();
    }
}

为了验证这一点，我创建了以下单元测试

public class UnitTestEntityViewModel
{
    public int Id { get; set; }
    public int Text2 { get; set; }
}
public class TestProjectionMapping : IEntityMapConfiguration
{
    public void ConfigureMapping()
    {
        Mapper.CreateMap<UnitTestEntity, UnitTestEntityViewModel>()
            .ForMember(dest => dest.Id, opt => opt.MapFrom(src => src.Id))
            .ForMember(dest => dest.Text2, opt => opt.MapFrom(src => src.Text));
    }
}
[TestClass]
public class AutomapperConfigurationTests
{
    [TestMethod]
    public void Loader_Loads_All_Configurations_In_Assembly()
    {
        // Setup
        UnitTestEntity entity = new UnitTestEntity { Id = 2, Text = "Test 1234" };
        // Act
        EntityMapLoader.LoadEntityMappings();
        // Verify
        UnitTestEntityViewModel result = Mapper.Map<UnitTestEntity, UnitTestEntityViewModel>(entity);
        Assert.AreEqual(entity.Id, result.Id, "View model's ID value did not match");
        Assert.AreEqual(entity.Text, result.Text2, "View model's text value did not match");
    }
}

问题是这个单元测试失败了，因为它没有拾取我的TestProjectionMapping类，我不知道为什么。在我的LoadEntityMappings()中，types列表计数为零。我已经验证了我的测试组件是从AppDomain.CurrentDomain.GetAssemblies()返回的。

我肯定我做了一些明显的错误，但我找不到它。什么好主意吗?

---

Edit:我将LoadentityMappings()方法更新为:

    public static void LoadEntityMappings()
    {
        // Load all IEntityMapConfiguration classes via reflection
        var types = AppDomain.CurrentDomain
                             .GetAssemblies()
                             .SelectMany(x => x.GetTypes())
                             .Where(x => x.GetInterfaces().Contains(typeof(IEntityMapConfiguration)))
                             .Select(x => x as IEntityMapConfiguration)
                             .ToList();
        foreach (var config in types)
            config.ConfigureMapping();
    }

仍然失败。语句(没有最后的选择)返回我的TestProjectionMapping类，但x as IEntityMapconfiguration失败。在调试器中，当我输入(IEntityMapConfiguration)types[0]时，我得到以下错误:

Cannot cast 'types[0]' (which has an actual type of 'System.RuntimeType') to 'MyJobLeads.DomainModel.EntityMapping.IEntityMapConfiguration'

参考观察列表输入types[0]显示:

types[0] {Name = "TestProjectionMapping" FullName = "MyJobLeads.Tests.TestProjectionMapping"} System.Type {System.RuntimeType}

同样，types[0] is IEntityMapConfiguration是false

我不知道为什么我不能出演这个角色，有什么想法吗?