C# 使用 AutoMapper 将对象的属性映射到字符串
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Using AutoMapper to map the property of an object to a string
提问by marcusstarnes
I have the following model:
我有以下模型：
public class Tag
{
public int Id { get; set; }
public string Name { get; set; }
}
I want to be able to use AutoMapper to map the Nameproperty of the Tagtype to a string property in one of my viewmodels.
我希望能够使用 AutoMapperName将Tag类型的属性映射到我的一个视图模型中的字符串属性。
I have created a custom resolver to try to handle this mapping, using the following code:
我创建了一个自定义解析器来尝试处理此映射，使用以下代码：
public class TagToStringResolver : ValueResolver<Tag, string>
{
protected override string ResolveCore(Tag source)
{
return source.Name ?? string.Empty;
}
}
I am mapping using the following code:
我正在使用以下代码进行映射：
Mapper.CreateMap<Tag, String>()
.ForMember(d => d, o => o.ResolveUsing<TagToStringResolver>());
When I run the application I get the error:
当我运行应用程序时，我收到错误：
Custom configuration for members is only supported for top-level individual members on a type.
成员的自定义配置仅支持类型上的顶级个人成员。
What am I doing wrong?
我究竟做错了什么？
采纳答案by Rob West
This is because you are trying to map to the actual destination type rather than a property of the destination type. You can achieve what you want with:
这是因为您试图映射到实际的目标类型而不是目标类型的属性。您可以通过以下方式实现您想要的：
Mapper.CreateMap<Tag, string>().ConvertUsing(source => source.Name ?? string.Empty);
although it would be a lot simpler just to override ToString on the Tag class.
尽管仅在 Tag 类上覆盖 ToString 会简单得多。
回答by ZafarYousafi
ForMember means you are providing mapping for a member where you want a mapping between type. Instead, use this :
ForMember 意味着您正在为需要类型之间映射的成员提供映射。相反，使用这个：
Mapper.CreateMap<Tag, String>().ConvertUsing<TagToStringConverter>();
And Converter is
转换器是
public class TagToStringConverter : ITypeConverter<Tag, String>
{
public string Convert(ResolutionContext context)
{
return (context.SourceValue as Tag).Name ?? string.Empty;
}
}
