c# – 防止Automapper将IEnumerable属性转换为List

我正在尝试将Model映射到viewmodel,该viewmodel具有从IEnumerable继承的类型属性.属性具有相同的类型和名称,但Automapper将源转换为通用列表,然后无法映射到目标.

这些是我想要映射的类：

BasicOverview
{
   public IRichTextContent Intro { get; set; }
   ...
}

Blogoverviewviewmodel
{
   public IRichTextContent Intro { get; set; }
   ...
}

以下是定义IRichTextContent类型的第三方代码：

//     Represents rich text content in a form of structured data
public interface IRichTextContent : IEnumerable<IRichTextBlock>,IEnumerable
{
    //
    // Summary:
    //     List of rich text content blocks
    IEnumerable<IRichTextBlock> Blocks { get; set; }
}

我的Automapper配置文件：

public AutomapperProfile()
    {
        CreateMap<BasicOverview,BlogListviewmodel>();
        CreateMap<BasicOverview,ReviewListviewmodel>();
        CreateMap<BasicOverview,Blogoverviewviewmodel>();
    }

这是我得到的错误：

An unhandled exception occurred while processing the request.
InvalidCastException: Unable to cast object of type ‘System.Collections.Generic.List`1[KenticoCloud.Delivery.IRichTextBlock]’ to type ‘KenticoCloud.Delivery.IRichTextContent’.
lambda_method(Closure,BasicOverview,Blogoverviewviewmodel,ResolutionContext )

AutoMapperMappingException: Error mapping types.

Mapping types:
BasicOverview -> Blogoverviewviewmodel

Type Map configuration:
BasicOverview -> Blogoverviewviewmodel

Destination Member:
Intro
lambda_method(Closure,ResolutionContext )

我尝试将以下内容添加到我的Automapper配置文件中：

CreateMap<IEnumerable<IRichTextBlock>,IRichTextContent>()
            .ForMember(dest => dest.Blocks,m => m.MapFrom(src => src));

其中产生了以下错误：

TypeLoadException: Method ‘GetEnumerator’ in type ‘Proxy_KenticoCloud.Delivery.IRichTextContent_12345678_’ from assembly ‘AutoMapper.Proxies,Version=0.0.0.0,Culture=neutral,PublicKeyToken=abc123ef45’ does not have an implementation.

解决方法

只是为了让 Lucian Bargaoanu的评论更加明显.

其中一个解决方案是将以下映射添加到Automapper配置文件：

CreateMap<IRichTextContent,IRichTextContent>().ConvertUsing(s=>s);