c# - EmitMapper's List Mapping Issue with Collections -

the source class:

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; } } 

the destination class

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; } } 

i try using emitmapper map each other; when mapping source desction, here code sample：

[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());     } 

and got exception,

test method mblog.test.emitmappertest.shoulemapentitytomodel threw exception: system.exception: constructor types [] not found in system.collections.generic.ilist`1[[mblog.core.models.post, mblog.core, version=1.0.0.0, culture=neutral, publickeytoken=null]]

i had same problem, have found solution. don't user lists destination object. if use simple arrays in mblog.core.models.post object should nicely filled object. destination class should like:

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; } }