我開始執行AutoMapper,首先我設法將它與Castle.Windsor集成,我已經使用它。現在我有一個Post
實體,我想要映射到或ImagePostModel
。無論從PostModel
AutoMapper根據枚舉映射到不同的類型?
1)繼承這是我到目前爲止有:
public class PostModelFromPostEntityConverter : ITypeConverter<Post, PostModel>
{
private readonly IPostService postService;
public PostModelFromPostEntityConverter(IPostService postService)
{
if (postService == null)
{
throw new ArgumentNullException("postService");
}
this.postService = postService;
}
public PostModel Convert(ResolutionContext context)
{
Post post = (Post)context.SourceValue;
Link link = post.Link;
if (link.Type == LinkType.Html)
{
return new LinkPostModel
{
Description = link.Description,
PictureUrl = link.Picture,
PostId = post.Id,
PostSlug = postService.GetTitleSlug(post),
Timestamp = post.Created,
Title = link.Title,
UserMessage = post.UserMessage,
UserDisplayName = post.User.DisplayName
};
}
else if (link.Type == LinkType.Image)
{
return new ImagePostModel
{
PictureUrl = link.Picture,
PostId = post.Id,
PostSlug = postService.GetTitleSlug(post),
Timestamp = post.Created,
UserMessage = post.UserMessage,
UserDisplayName = post.User.DisplayName
};
}
return null;
}
}
顯然在實施AutoMapper點是消除這樣的重複代碼,所以我怎麼映射的共同的東西,加入我的自定義規則(如if子句)之前
理想我想這是這樣的:
public class PostModelFromPostEntityConverter : ITypeConverter<Post, PostModel>
{
[...]
public PostModel Convert(ResolutionContext context)
{
Post post = (Post)context.SourceValue;
Link link = post.Link;
if (link.Type == LinkType.Html)
{
return Mapper.Map<Post, LinkPostModel>(post);
// and a few ForMember calls?
}
else if (link.Type == LinkType.Image)
{
return Mapper.Map<Post, ImagePostModel>(post);
// and a few ForMember calls?
}
return null;
}
}
2)此映射完成後。我有一個「父」的映射,在這裏我需要映射一個IEnumerable<Post>
以下模型:
public class PostListModel : IHasOpenGraphMetadata
{
public OpenGraphModel OpenGraph { get; set; } // og:model just describes the latest post
public IList<PostModel> Posts { get; set; }
}
所以基本上我需要另一個TypeConverter
(右?),這讓我首先映射的職位列表,然後創建og:model
我有這個,但它那種感覺笨重,我覺得還可以更好:
public class PostListModelFromPostEntityEnumerableConverter : ITypeConverter<IEnumerable<Post>, PostListModel>
{
public PostListModel Convert(ResolutionContext context)
{
IEnumerable<Post> posts = (IEnumerable<Post>)context.SourceValue;
PostListModel result = new PostListModel
{
Posts = posts.Select(Mapper.Map<Post, PostModel>).ToList()
};
Post first = posts.FirstOrDefault();
result.OpenGraph = Mapper.Map<Post, OpenGraphModel>(first);
return result;
}
}
3)我實際上並沒有運行代碼,所以想到另一個問題,那就是爲什麼轉換器中沒有強類型的映射?
IEnumerable<Post> posts = (IEnumerable<Post>)context.SourceValue;
它實際上可能是
IEnumerable<Post> posts = context.SourceValue;