[英]AutoMapper: Mapping a collection of Object to a collection of strings
I need help with a special mapping with AutoMapper.我需要使用 AutoMapper 进行特殊映射的帮助。 I want to map a collection of objects to a collection of strings.我想将 map 对象集合转换为字符串集合。
So i have a Tag classd所以我有一个标签分类
public class Tag
{
public Guid Id { get; set; }
public string Name {get; set; }
}
Than in a model i have a IList of this class.比在 model 中,我有这个 class 的 IList。 Now i want to map the name's to a collection of strings.现在我想将 map 的名称添加到字符串集合中。
Thats how I define the mapping rule:这就是我定义映射规则的方式:
.ForMember(dest => dest.Tags, opt => opt.ResolveUsing<TagNameResolver>())
And here is my ValueResolver:这是我的ValueResolver:
protected override string ResolveCore(Tag source)
{
return source.Name;
}
But u know.. it dont work;-) So maybe someone know how to do it right and can help me.但是你知道..它不起作用;-)所以也许有人知道如何正确地做它并且可以帮助我。
thx alot多谢
Jan简
Sooo.. u wanted more details.. here u get it.. but i have shorten it;) Sooo ..你想要更多细节..在这里你明白了..但我缩短了它;)
So the Model:所以Model:
public class Artocle
{
public Guid Id { get; set; }
public string Title {get; set; }
public string Text { get; set; }
public IList<Tag> Tags { get; set; }
}
And the Tag model u can see above.您可以在上面看到标签 model。
I want to map it to a ArticleView... i need the tag model only for some business context, not for tthe output.我想将 map 放到 ArticleView... 我需要标签 model 仅用于某些业务环境,不适用于 output。
So here is the ViewModel i need to map to:所以这是我需要 map 到的 ViewModel:
public class ArticleView
{
public Guid Id { get; set; }
public string Title { get; set; }
public string Text { get; set; }
public IList<string> Tags { get; set; } // The mapping problem :-)
}
So I have a BootStrapper for the mappings.所以我有一个用于映射的 BootStrapper。 My Mapping looks like this:我的映射如下所示:
Mapper.CreateMap<Article, ArticleView>()
.ForMember(dest => dest.Tags, opt => opt.ResolveUsing<TagNameResolver>())
And I map it manuelly with a special method而我 map 它用特殊的方法手动
public static ArticleView ConvertToArticleView(this Article article)
{
return Mapper.Map<Article, ArticleView>(article);
}
A unit test validated the following would map from IList <Tag>
to IList <string>
单元测试验证了从 IList <Tag>
到 IList <string>
的 map
private class TagNameResolver : ValueResolver<IList<Tag>, IList<string>>
{
protected override IList<string> ResolveCore(IList<Tag> source)
{
var tags = new List<string>();
foreach (var tag in source)
{
tags.Add(tag.Name);
}
return tags;
}
}
This is a shorter way of creating the map:这是创建 map 的更短的方法:
.ForMember(dest => dest.Tags, opt => opt.MapFrom(so => so.Tags.Select(t=>t.Name).ToList()));
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