I have been looking everywhere to find out how to catch a base fault contract type in c#. I would like to have all my fault contracts inherit from one class and have one catch(FaultException fex) in the MVC controller.
DataContracts
[DataContract]
public class BaseClass1
{ }
[DataContract]
public class Class2 : BaseClass1
{ }
Service
[ServiceContract]
public interface IService1
{
[OperationContract]
[FaultContract(typeof(BaseClass1))]
[FaultContract(typeof(Class2))] //Do I need this one?
void ThrowClass2();
}
public class Service1 : IService1
{
public void ThrowClass2()
{
throw new FaultException<Class2>(new Class2(), "Class2 Reason");
}
}
Service Consumer
FaultTestService.Service1Client client = null;
try
{
client = new FaultTestService.Service1Client();
client.ThrowAmpFaults("InvalidParameter", 0);
}
catch (FaultException<Namespace.BaseClass1> fex)
{
//DOES NOT GO IN HERE AS I WOULD EXPECT
}
catch (FaultException fex)
{
//Other Possible Option
MessageFault fault = fex.CreateMessageFault();
var fe1 = fault.GetDetail<BaseClass1>();
//This throws a serialization exception it needs <Class2>
}
Please let me know if either of these catch statements can be fixed to do what I am looking for.
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That syntax will not work in C#. Consider the folowing "workaround" instead.
try
{
throw new FaultException<DerivedClass2>(new DerivedClass2());
}
catch (FaultException fex)
{
bool handled = false;
Type fexType = fex.GetType();
if (fexType.IsGenericType && fexType.GetGenericTypeDefinition() == typeof(FaultException<>))
{
if (typeof(BaseClass1).IsAssignableFrom(fexType.GetGenericArguments()[0]))
{
object detail = fexType.GetProperty("Detail").GetValue(fex, null);
// Use detail here.
handled = true;
}
}
if (!handled)
throw; // Don't know how to handle. Re-throw.
}
This can be simplified if we disregard the unusual case where Detail == null
but the constructed generic type matches. I'll also use the C# dynamic keyword to simplify it a little further.
try
{
throw new FaultException<DerivedClass2>(new DerivedClass2());
}
catch (FaultException fex)
{
bool handled = false;
Type fexType = fex.GetType();
if (fexType.IsGenericType && fexType.GetGenericTypeDefinition() == typeof(FaultException<>))
{
object detail = ((dynamic)fex).Detail;
if (detail is BaseClass1) // true for subclasses too!
{
// Use detail here.
}
}
if (!handled)
throw; // Don't know how to handle. Re-throw.
}
The other thing to consider is whether you should just use throw new FaultException<BaseClass1>(new DerivedClass2())
. This way of throwing will let you catch using the code you originally provided.
Sorry, there is no way to do this. There is no relationship between FaultException<T1>
and FaultException<T2>
simply because T1
may be a subclass of T2
.
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