We have a simple WCF service that has a Data Contract class decorated with a custom attribute. The DataContract class is one of the parameter of the method defined in the service. The proxy on client application tries to read the method parameters
and try to retrieve the attributes but it doesn't show the custom attribute at all.
WCF Service
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.Security;
[assembly: AllowPartiallyTrustedCallers]
namespace TestCustomAttributesInWCFService
{
// NOTE: If you change the interface name "IService1" here, you must also update the reference to "IService1" in App.config.
[ServiceContract]
public interface IService1
{
[OperationContract]
string GetData(int value);
[OperationContract]
CompositeType GetDataUsingDataContract(CompositeType composite);
// TODO: Add your service operations here
}
// Use a data contract as illustrated in the sample below to add composite types to service operations
[Flag("UserDefinedClass")]
[DataContract]
public class CompositeType
{
bool boolValue = true;
string stringValue = "Hello ";
[DataMember]
public bool BoolValue
{
get { return boolValue; }
set { boolValue = value; }
}
[DataMember]
public string StringValue
{
get { return stringValue; }
set { stringValue = value; }
}
}
public class FlagAttribute : Attribute
{
// This constructor specifies the unnamed arguments to the attribute class.
public FlagAttribute(string name)
{
this.name = name;
}
// This property is readonly (it has no set accessor)
// so it cannot be used as a named argument to this attribute.
public string Name
{
get
{
return name;
}
}
public override string ToString()
{
string value = "Flag : " + Name;
return value;
}
private string name;
}
}
I am trying to read the attribute on client side to perform so particular task. But the attribute is missing.
The Client Code is:
MyService.Service1Client client = new MyService.Service1Client();
Type t = typeof(MyService.Service1Client);
MethodInfo members = t.GetMethod("GetDataUsingDataContract");
ParameterInfo[] parameters = members.GetParameters();
foreach (var parameter in parameters)
{
Type tt = parameter.ParameterType;
object[] attributes;
attributes = tt.GetCustomAttributes(true);
}
The GetCustomAttributes function returns 4 elements. Not sure what are all these:
System.SerializableAttribute
System.CodeDom.Compiler.GeneratedCodeAttribute
System.Runtime.Serialization.DataContractAttribute
System.Diagnostics.DebuggerStepThroughAttribute
but not MyAttribute.
Why is my custom attribute missing? What am I missing here?? The above code is just a sample code that I am trying to debug. Actually I am generating the proxy at runtime based on the URI (http://.../xyz.svc).
