WCF数据服务不能在饲料条目处理更新

Question

我和我的一些好友正在尝试开始使用WCF数据服务，所以让我先介绍一下我们迄今所做的：

1. 我们创建了一个相当简单的WCF数据服务，其数据源实现了IUpdatable接口，并通过一些公共的IQueryable属性（代码附在底部）公开了一些数据。使用Visual Studio 2010，起初我们在IIS 7中运行我们的服务，但由于我们无法弄清楚错误，我们决定使用Cassini（Webdev webserver）来运行它。

2. 我们在C＃中编写了一个客户端来使用该服务。客户端按所有不同的数据操作（创建，读取，更新和删除）工作。到现在为止还挺好！在IIS 7 Web服务器上托管服务时，我们必须使用POST隧道来进行更新和删除工作，但现在它按预期工作。

3. 当我们尝试使用我们的Java（Restlet）和Ruby（ruby_odata）客户端使用服务时，出现问题：我们无法用这些客户端更新数据（我们得到“500 Internal Server Error”和“Method不允许“从服务器回复）。我们使用了两个非常简单的教程[a，b]来创建我们的客户。因此我们认为我们的问题在于我们的服务。

a。 ruby_odata：http：//rdoc.info/projects/visoft/ruby_odata
b。 restlet：http：//wiki.restlet.org/docs_2.0/13-restlet/28-restlet/287-restlet/288-restlet.html

这两个客户端都列为OData SDK（http://www.odata.org/developers/odata-sdk），应该正常工作以消耗OData Feed。

我们在监视HTTP请求时注意到的一件事是，C＃客户端使用HTTP MERGE动词进行更新（请参阅此处了解更多信息：http：//blogs.msdn.com/b/astoriateam/archive/ 2008/05/20/merge-vs-replace-semantics-for-update-operations.aspx），而Java和Ruby都使用HTTP PUT进行更新。这可能是为什么只有我们的C＃客户端的原因？我们能做些什么来启用PUT更新？

我们刚开始用.NET，并希望如果可能被考虑到，当你回答

using System; 
using System.Collections.Generic; 
using System.Data.Services; 
using System.Linq; 
using System.Data.Services.Providers; 
using System.Reflection; 
using System.ServiceModel.Web; 
using System.Data.Services.Common; 

namespace WCFDataServiceApp 
{ 

    public class Product 
    { 
     public int ID { get; set; } 
     public string Name { get; set; } 
     public string Color { get; set; } 
     public Category ProductCategory { get; set; } 
    } 

    public class Category 
    { 
     public int ID { get; set; } 
     public string Name { get; set; } 


    } 

    public class AWData : IUpdatable 
    { 

     static List<Category> categories; 
     static List<Product> products; 

     static AWData() 
     { 

      categories = new List<Category>() { 
       new Category { ID = 1, Name = "Bikes" }, 
       new Category { ID = 2, Name = "Parts" }, 
       new Category { ID = 3, Name = "Wheels"}, 
      }; 

      products = new List<Product>() { 
       new Product { ID = 1, Name = "Red Bike", Color = "Red", ProductCategory = categories[0] }, 
       new Product { ID = 2, Name = "Blue Bike", Color = "Blue", ProductCategory = categories[0] }, 
       new Product { ID = 3, Name = "Green Bike", Color = "Green", ProductCategory = categories[0] }, 
       new Product { ID = 4, Name = "Yellow Bike", Color = "Yellow", ProductCategory = categories[0] }, 
       new Product { ID = 5, Name = "Pink Bike", Color = "Pink", ProductCategory = categories[0] }, 
       new Product { ID = 6, Name = "Black Bike", Color = "Black", ProductCategory = categories[0] } 
      };   

     } 

     public IQueryable<Category> Categories 
     { 
      get { return categories.AsQueryable(); } 
     } 

     public IQueryable<Product> Products 
     { 
      get { return products.AsQueryable(); } 
     } 




     void IUpdatable.AddReferenceToCollection(object targetResource, string propertyName, object resourceToBeAdded) 
     { 
      System.Diagnostics.Debug.WriteLine("No support for AddReferenceToCollection(object targetResource, string propertyName, object resourceToBeAdded)"); 
     } 

     void IUpdatable.ClearChanges() 
     { 
      System.Diagnostics.Debug.WriteLine("ClearChanges()"); 
     } 

     public object CreateResource(string containerName, string fullTypeName) 
     { 
      System.Diagnostics.Debug.WriteLine("CreateResource(string containerName, string fullTypeName)"); 
      Type t = Type.GetType(fullTypeName); 

      // Check if resource exists 
      if (t != null) 
      { 
       object resource = Activator.CreateInstance(t); 
       if (containerName.Equals("Categories")) 
       { 
        categories.Add((Category)resource); 
       } 
       else if (containerName.Equals("Products")) 
       { 
        products.Add((Product)resource); 
       } 
       return resource; 
      } 
      // Current resource does not exist 
      return new Exception("Could not create a resource of type " + containerName); 

     } 

     void IUpdatable.DeleteResource(object targetResource) 
     { 
      // 1. Check object type 

      if (targetResource.GetType().IsInstanceOfType(new Category())) 
      { 
       System.Diagnostics.Debug.WriteLine("Category deleted!"); 
       categories.Remove((Category)targetResource); 
      } 
      else if (targetResource.GetType().IsInstanceOfType(new Product())) 
      { 
       System.Diagnostics.Debug.WriteLine("Product deleted!"); 
       products.Remove((Product)targetResource); 
      } 

     } 

     object IUpdatable.GetResource(IQueryable query, string fullTypeName) 
     { 
      System.Diagnostics.Debug.WriteLine("GetResource(IQueryable query, string fullTypeName)"); 
      object obj = null; 
      foreach (object o in query) 
      { 
       obj = o; 
      } 
      return obj; 

     } 



     object IUpdatable.GetValue(object targetResource, string propertyName) 
     { 
      System.Diagnostics.Debug.WriteLine("GetValue(object targetResource, string propertyName)"); 
      return null; 
     } 

     void IUpdatable.RemoveReferenceFromCollection(object targetResource, string propertyName, object resourceToBeRemoved) 
     { 
      System.Diagnostics.Debug.WriteLine("RemoveReferenceFromCollection(object targetResource, string propertyName, object resourceToBeRemoved)"); 
     } 

     object IUpdatable.ResetResource(object resource) 
     { 

      System.Diagnostics.Debug.WriteLine("ResetResource(object resource)"); 
      return null; 
     } 

     object IUpdatable.ResolveResource(object resource) 
     { 
      return resource; 
     } 

     void IUpdatable.SaveChanges() 
     { 
      System.Diagnostics.Debug.WriteLine("SaveChanges()"); 
     } 

     void IUpdatable.SetReference(object targetResource, string propertyName, object propertyValue) 
     { 
      System.Diagnostics.Debug.WriteLine("SetReference(object targetResource, string propertyName, object propertyValue)"); 
     } 

     void IUpdatable.SetValue(object targetResource, string propertyName, object propertyValue) 
     { 
      PropertyInfo pi = targetResource.GetType().GetProperty(propertyName); 

      if (pi == null) 
       throw new Exception("Can't find property"); 
      pi.SetValue(targetResource, propertyValue, null); 

      System.Diagnostics.Debug.WriteLine("Object " + targetResource + " updated value " + propertyName + " to " + propertyValue); 
     } 

     public void SetConcurrencyValues(object resourceCookie, bool? checkForEquality, IEnumerable<KeyValuePair<string, object>> concurrencyValues) 
     { 
      System.Diagnostics.Debug.WriteLine("SetConcurrencyValues(object resourceCookie, bool? checkForEquality, IEnumerable<KeyValuePair<string, object>> concurrencyValues) was called"); 
      throw new Exception("SetConcurrencyValues(object resourceCookie, bool? checkForEquality, IEnumerable<KeyValuePair<string, object>> concurrencyValues) not implemented"); 
     } 
    } 

    public class aw : DataService<AWData> //, IServiceProvider 
    { 
     // This method is called only once to initialize service-wide policies. 
     public static void InitializeService(DataServiceConfiguration config) 
     { 
      config.SetEntitySetAccessRule("*", EntitySetRights.All); 
      //config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2; 

     } 
     /* 
     public object GetService(Type serviceType) 
     { 

      System.Diagnostics.Debug.WriteLine(serviceType.ToString()); 
      return this; 
     }*/ 
    } 
} 

Answer 1

同样的问题回答这里：http://social.msdn.microsoft.com/Forums/en-US/adodotnetdataservices/thread/31d3f2f0-3dd2-479f-8b44-45f59eef0c53/

的问题是，PUT将最终调用ResetResource，预期返回一个有效的资源实例，而不是null。