当映射（automapper）需要一个枚举类型转换为布尔 [英] When mapping (automapper) need to convert a type enum to a bool

问题描述

我有以下的模式

public class Foo
{
    [Key]
    public int      FooID { get; set; }
    public string   Description { get; set; }
    public bool     IsValid{ get; set; }
}

我有以下的视图模式

public class FooViewModel
{
    public int FooId { get; set; }
    public string Description { get; set; }
    public YesNoEnumViewModel IsValid{ get; set; }
}

有关YesNoEnumViewModel我用下面的枚举类型：

For the type YesNoEnumViewModel I used the following enum:

public enum YesNoEnumViewModel
{
    [Display(Name = "Yes", ResourceType = typeof(UserResource))]
    Yes = 1,
    [Display(Name = "No", ResourceType = typeof(UserResource))]
    No = 2
}

在我的code，我需要我的视图模型映射到我的模型。所以，我试试这个：

In my code I need to map my viewModel into my model. So I try this:

    [HttpPost]
    public ActionResult AddedNew(FooViewModel viewModel)
    {
        if (!ModelState.IsValid)
            return PartialView("AddedNew", viewModel);

        var foo = Mapper.Map<FooViewModel, FooModel>(viewModel);
        ...
    }

和试图映射时，我得到了一个错误。该错误是从枚举类型YesNoEnumViewModel转换为bool（在我的模型属性为BOOL类型）。

And I got an error when trying to map. The error is on the converting from the enum type YesNoEnumViewModel to bool (the property in my model is of type bool).

下面是我的CreateMap：

Here is my CreateMap:

Mapper.CreateMap<FooViewModel, Foo>();

也许我需要在CreateMap指定为成员的的IsValid我FooViewModel一些特别的东西必须做到将其转换为我的模型的布尔？

Maybe I need to specify in the CreateMap that for member IsValid of my FooViewModel something special must be done to convert it to a bool of my model?

感谢您的帮助。

推荐答案

也许我需要在CreateMap指定为我FooViewModel一些特殊成员的IsValid必须完成将其转换为我的模型的布尔？

"Maybe I need to specify in the CreateMap that for member IsValid of my FooViewModel something special must be done to convert it to a bool of my model?"

没错，你需要创建一个知道如何解决YesNoEnumViewModel布尔自定义解析：

Exactly, you need to create a custom Resolver that knows how to resolve YesNoEnumViewModel to Boolean:

Mapper.CreateMap<FooViewModel, Foo>().
     ForMember(dest => dest.IsValid, opt => opt.ResolveUsing<EnumResolver>());

internal class EnumResolver : ValueResolver<FooViewModel, bool>
{
    protected override bool ResolveCore(FooViewModel vm)
    {
        return vm.IsValid == YesNoEnumViewModel.Yes;
    }
}

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