pass generic class(Model) to wcf service call RSS

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  archmt

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  pass generic class(Model) to wcf service call

  Feb 01, 2011 06:58 PM | LINK

  I have a WCF service, have different type to objects(Person, Address classes) passed to service calls and these Person, Address objects returned from WCF call..

   

  In order to make service reusable it makes sense to have service figure out model type OR object type passed in at run time and while making service call from Silverlight ability to package these objects(person class values) in to generic object/byte array etc...

  Is there a way to achieve this..

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  MF_MiEK

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  Re: pass generic class(Model) to wcf service call

  Feb 01, 2011 07:16 PM | LINK

  Hi,
  You have to use KnowType attribute:

  using System;
  using System.ComponentModel;
  using System.Runtime.Serialization;
  
  namespace MyNamespace 
  {
      [DataContract]
      [KnownType(Class2)]
      [KnownType(Class3)]
      public class Class1
      {
          [DataMember]
          public int Id { get; set; }
  
          [DataMember]
          public Object MyObjectProperty { get; set; }
          
      }
  }

  
  
  

  In this example you can pass in "MyObjectProperty" objects of 'Class2' or 'Class3'.

  Find more examples in MSDN  for [KnownTypes ()].

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  archmt

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  Re: pass generic class(Model) to wcf service call

  Feb 02, 2011 12:32 PM | LINK

  Thanks.

  1)What about when I want to pass class 1 as an object while making service calls.

  How to pass this object in a serivce call froom SL...byte array?

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  MF_MiEK

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  Re: pass generic class(Model) to wcf service call

  Feb 02, 2011 01:34 PM | LINK

  Hi,
  I haven't ever tried it with byte [], but I think it's the same :

  [KnownType(typeof(byte[]))]

  
  And for service:

  
  

      [ServiceKnownType(typeof(byte[]))]
  

  http://thzero.blogspot.com/2009/03/wcf-silverlight-and-known-types_21.html

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  archmt

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  Re: pass generic class(Model) to wcf service call

  Feb 02, 2011 04:48 PM | LINK

  So I have:

  1)

  [DataContract] 
       public class Class1 
      { 
          [DataMember] 
          public int Id { get; set; } 
   
          [DataMember] 
          public string Name { get; set; } 
           
      } 
  

  2)

  [DataContract] 
       public class Class2 
      { 

          [DataMember] 
          public string FirstName { get; set; } 
  
          [DataMember] 
          public string LastName { get; set; } 
   
          [DataMember] 
          public string City{ get; set; } 
           
      } 

   

  3) Some other object Class3...

  I want to have service recive/deliver any (class1, class2, class3) and perform same operation to fetch data from DB irrespective of Class it receives..so Service has Read and write, Update methods

   

  [ServiceContract(Namespace = "")]
  public interface IService
  //GenericItem can be class1, class2, class3   
  {[OperationContract]
      GenericItem Read(GenericItem item);
      [OperationContract]
     GenericItem Write(GenericItem item);
      [OperationContract]
      GenericItem Update(GenericItem item);
  }

  [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
      public class Service:IService
      {
        
         public IAsyncResult BeginRead(GenericItem obj, AsyncCallback callback, object state)
          {
          }

      }

  so, GenericItem can be of type Class1, class2 or class3...
  SerivceContract and service needs not to have knowledge earlier of which type..shuould be able to figure out at runtime that this is class1 or class2.

   

  
  

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  archmt

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  Re: pass generic class(Model) to wcf service call

  Feb 02, 2011 04:53 PM | LINK

  ALSO, how would service know the type of object it received here i.e. for MyObjectProperty

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  MF_MiEK

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  Re: pass generic class(Model) to wcf service call

  Feb 02, 2011 05:53 PM | LINK

  Hi,

      [KnownType(Class2)]
      [KnownType(Class3)]
      [DataContract] 
      public class GenericItem 
      { 
          [DataMember] 
          public int Id { get; set; } 
   
          [DataMember] 
          public object ObjectOfOtherClass { get; set; } 
           
      } 

  and service:

  [ServiceKnownType(typeof(Class1))]
  [ServiceKnownType(typeof(Class2))]
  [ServiceKnownType(typeof(byte[]))]
  [ServiceContract(Namespace = "")]
  public interface IService
  //GenericItem can be class1, class2, class3   
  {[OperationContract]
      GenericItem Read(GenericItem item);
      [OperationContract]
     GenericItem Write(GenericItem item);
      [OperationContract]
      GenericItem Update(GenericItem item);
  }

  
  
  

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  archmt

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  Re: pass generic class(Model) to wcf service call

  Feb 02, 2011 06:57 PM | LINK

  Hi

   how to access say class2 and it's properties(modify it as well) in the service code..

  For example =Class2.LastName  

  And Say SL client app uses class2...how to pass that info from client to service so that service code knows that it is class2 to it has recieved etc.

  
  

  Thanks.

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  Daoping Liu...

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  Re: pass generic class(Model) to wcf service call

  Feb 03, 2011 08:08 AM | LINK

  Hi,

  You can ask for more help from Asp.net forum.

  Hope that will help.

   

  Regards

  Please mark the replies as answers if they help or unmark if not.
  If you have any feedback about my replies, please contact msdnmg@microsoft.com.
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