小编Som*_* me的帖子

考虑这个简单的代码：

public void Main()
{
    var d = new Derived();

    test(d);
}

public void test(Base parameter)
{
    parameter.Validate();
}

public class Base
{
}
public class Derived : Base
{
}

public static class Validation
{
    public static void Validate(this Base b)
    {
        Console.WriteLine("Validation for base");
    }
    public static void Validate(this Derived d)
    {
        Console.WriteLine("Validation for Derived");
    }
}

当测试方法被调用时，它将执行 Validate 方法，该方法采用基本参数，而不是像我调用d.Validate().

如何强制测试方法调用正确的 Validate 方法，而不在其中进行类型测试？

我无法将嵌套模型的值恢复到控制器,它们都是空值.

这是简化的架构:

//The viewModel being passed to the view
public class RunnerIndexViewModel
{
    public RegisterViewModel User { get; set; }

    public TrainerViewModel TrainerVM { get; set; }

    public RunnerBase Runner { get; set; }

    [Display(Name = "AddContact", ResourceType = typeof(MyRessources))]
    public bool AddContact { get; set; }
}

public class RegisterViewModel
{
    // various simple type properties here
}

public class TrainerViewModel
{
    // various properties here
    public Unit unit { get; set; }

    public List<SelectListItem> ListStatut { get; set; …