c# - EmitMapper的集合列表映射问题

源类：

public class Post
{
    public long ID { get; set; }

    [Column(TypeName="nvarchar")]
    [Required]
    [StringLength(250)]
    public string Name { get; set; }

    [Column(TypeName="varchar")]
    [StringLength(250)]
    public string UrlName { get; set; }

    [Column(TypeName="ntext")]
    public string Excerpt { get; set; }

    [Column(TypeName="ntext")]
    [Required]
    public string Content { get; set; }

    public DateTime PostedTime { get; set; }
    public DateTime? PublishedTime { get; set; }
    public DateTime? LastUpdatedTime { get; set; }
    public bool IsPublished { get; set; }

    public virtual List<Category> Categories { get; set; }
    public virtual List<Comment> Comments { get; set; }
    public virtual List<Tag> Tags { get; set; }
}

目的地班

public class Post : Model
{
    public long ID { get; set; }
    public string Name { get; set; }
    public string UrlName { get; set; }
    public string Excerpt { get; set; }
    public string Content { get; set; }
    public DateTime PostedTime { get; set; }
    public DateTime LastCommentedTime { get; set; }
    public bool IsPublished { get; set; }

    public List<Category> Category { get; set; }
    public List<Comment> Comments { get; set; }
    public List<Tag> Tags { get; set; }
}

我尝试使用EmitMapper互相映射。从源映射到目标时，这是代码示例：

[TestMethod]
    public void ShouleMapEntityToModel()
    {
        Post eP = new Post();
        eP.ID = 2;
        eP.Comments = new List<Comment>();

        eP.Comments.Add(new Comment()
            {
                ID = 2,
                Author = "derek"
            });

        var mP = eP.Map<Post, mBlog.Core.Models.Post>();

        Assert.IsNotNull(mP);
        Assert.AreEqual(1, mP.Comments.Count());
    }

我有一个例外，

测试方法mBlog.Test.EmitMapperTest.ShouleMapEntityToModel抛出异常：
System.Exception：在System.Collections.Generic.IList`1中找不到类型[]的构造方法[[mBlog.Core.Models.Post，mBlog.Core，Version = 1.0.0.0，Culture = neutral，PublicKeyToken = null]]

最佳答案

我有同样的问题，但是我找到了解决方案。不要使用List作为目标对象。如果在mBlog.Core.Models.Post对象中使用简单数组，则应该得到一个填充良好的对象。因此，您的目标类别应如下所示：

public class Post : Model
{
    public long ID { get; set; }
    public string Name { get; set; }
    public string UrlName { get; set; }
    public string Excerpt { get; set; }
    public string Content { get; set; }
    public DateTime PostedTime { get; set; }
    public DateTime LastCommentedTime { get; set; }
    public bool IsPublished { get; set; }

    public Category[] Category { get; set; }
    public Comment[] Comments { get; set; }
    public Tag[] Tags { get; set; }
}

关于c# - EmitMapper的集合列表映射问题，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/5834574/