Asp.Net WebApi得到结果

Question

我在ASP.Net WebApi项目中有以下控制器。 该模型是使用实体框架生成的。

public class CategoriesController : ApiController 
    { 
     private eLearningDbEntities context = new eLearningDbEntities(); 


     // GET api/Categories 
     public IEnumerable<Categories> GetCategories() 
     { 
      var query = from c in context.Categories 
         select c; 
      return query; 
     } 
    } 

当调用从浏览器我得到以下结果控制器，但我想要得到的模式，而不是所有的上下文属性的唯一属性。任何想法有什么不对？

<ArrayOfCategories xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/eLearning.DomainModel"> 
<Categories xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/" z:Id="i1"> 
<EntityKey xmlns:d3p1="http://schemas.datacontract.org/2004/07/System.Data" xmlns="http://schemas.datacontract.org/2004/07/System.Data.Objects.DataClasses" z:Id="i2"> 
<d3p1:EntityContainerName>eLearningDbEntities</d3p1:EntityContainerName> 
<d3p1:EntityKeyValues> 
<d3p1:EntityKeyMember> 
<d3p1:Key>ID</d3p1:Key> 
<d3p1:Value xmlns:d6p1="http://www.w3.org/2001/XMLSchema" i:type="d6p1:int">1</d3p1:Value> 
</d3p1:EntityKeyMember> 
</d3p1:EntityKeyValues> 
<d3p1:EntitySetName>Categories</d3p1:EntitySetName> 
</EntityKey> 
<ID>1</ID> 
<Name>e-Business</Name> 
</Categories> 
<Categories xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/" z:Id="i3"> 
<EntityKey xmlns:d3p1="http://schemas.datacontract.org/2004/07/System.Data" xmlns="http://schemas.datacontract.org/2004/07/System.Data.Objects.DataClasses" z:Id="i4"> 
<d3p1:EntityContainerName>eLearningDbEntities</d3p1:EntityContainerName> 
<d3p1:EntityKeyValues> 
<d3p1:EntityKeyMember> 
<d3p1:Key>ID</d3p1:Key> 
<d3p1:Value xmlns:d6p1="http://www.w3.org/2001/XMLSchema" i:type="d6p1:int">2</d3p1:Value> 
</d3p1:EntityKeyMember> 
</d3p1:EntityKeyValues> 
<d3p1:EntitySetName>Categories</d3p1:EntitySetName> 
</EntityKey> 
<ID>2</ID> 
<Name>SADE</Name> 
</Categories> 
</ArrayOfCategories> 

谢谢！

Answer 1

您不应该直接传回数据库实体，而是创建一个可以传回的视图模型，将消息隔离为仅关注您在客户端接收的字段。例如

// Create a View Model to hold appropriate properties 
public class MyViewModel 
{ 
    public string PropertyA {get; set;} 
    public string PropertyB {get; set;} 
} 

... 

// Map your entity to the View Model and return it. 
var viewModel = context.Categories.Select(
     e=>new MyViewModel(){ 
     PropertyA = e.SomeProperty, 
     PropertyB = e.AnotherProperty   
    }); 
return viewModel;