Comments on: Async Operations in Wcf: Handling Exceptions

By: Anoosh

Anoosh — Sun, 12 Jul 2009 17:14:08 +0000

In a web based envrionment you cant guarantee the callers to stick around necessary for their response. I have a similar issue where if the client process terminates before async response is recieved, the server crashes. In my case WCF server is hosted by a service. So, having to re-start the service manually each time is not feasible. Is there anyway to handle such situations on the server, and not causing the service to crash?

By: Nemphys

Nemphys — Sat, 11 Jul 2009 14:56:33 +0000

Hi Dan, thank you for this enlightening article and your good code.
Concerning exception handling though, I have a problem properly returning faultexceptions to the client using (server-side) async operations.
For example, if I try throwing a FaultException in the FindSquareRoot method, even if I use a try/catch block around the endGetSqareRoot on the client side, the exception never reaches the client (it just crashes the server).
Any help on this matter would be greatly appreciated.

By: Shannon Broskie

Shannon Broskie — Thu, 26 Mar 2009 14:10:17 +0000

Hi again Dan,

As soon as I submitted this I found the answer. The e.Error object returned in the event args can be cast to the original FaultException definition granting access to the information.

By: Shannon Broskie

Shannon Broskie — Thu, 26 Mar 2009 13:56:58 +0000

Hey Dan, I’m trying to create some consistency between our synchronous and asynchronous calls. We use a FaultContract with a custom error class containing additional useful information for our application. When coding for synchronous calls we obviously have a try/catch around the catch and are able to catch the FaultException with our contract such as follows:

try
{
decimal result = proxy.ExceptionTest(23);
}
catch (FaultException err)
{
…
}

Unfortunately with asynchronous calls the error information returned in the asynchronous call methods event args only contains the ‘outer’ exception with the FaultReason as the message. How can we get to our ErrorInfo FaultContact class in that asynchronous call? We are using the event-model based approach.

Thanks for your input.

By: Dew Drop - August 29, 2008 | Alvin Ashcraft's Morning Dew

Dew Drop - August 29, 2008 | Alvin Ashcraft's Morning Dew — Fri, 29 Aug 2008 13:01:41 +0000

[...] Async Operations in WCF: Handling Exceptions (Dan Rigsby) [...]

By: Arjan`s World » LINKBLOG for August 28, 2008

Arjan`s World » LINKBLOG for August 28, 2008 — Thu, 28 Aug 2008 20:56:12 +0000

[...] Async Operations in Wcf: Handling Exceptions – Dan Rigsby [...]

By: Dan Rigsby » Async Operations in Wcf: Event Based Model

Dan Rigsby » Async Operations in Wcf: Event Based Model — Thu, 28 Aug 2008 20:02:11 +0000

[...] Posted by Dan Rigsby on March 18th, 2008 Async Operations in Wcf Series: Part 1: Event Based Model Part 2: IAsyncResult Model (Client-Side) Part 3: IAsyncResult Model (Server-Side) Part 4: Canceling Operations Part 5: Handling Exceptions [...]

By: Dan Rigsby » Async Operations in Wcf: IAsyncResult Model (Client-Side)

Dan Rigsby » Async Operations in Wcf: IAsyncResult Model (Client-Side) — Thu, 28 Aug 2008 20:00:20 +0000

[...] Posted by Dan Rigsby on March 20th, 2008 Async Operations in Wcf Series: Part 1: Event Based Model Part 2: IAsyncResult Model (Client-Side) Part 3: IAsyncResult Model (Server-Side) Part 4: Canceling Operations Part 5: Handling Exceptions [...]

By: Dan Rigsby » Async Operations in Wcf: IAsyncResult Model (Server-Side)

Dan Rigsby » Async Operations in Wcf: IAsyncResult Model (Server-Side) — Thu, 28 Aug 2008 19:53:52 +0000

[...] Posted by Dan Rigsby on March 26th, 2008 Async Operations in Wcf Series: Part 1: Event Based Model Part 2: IAsyncResult Model (Client-Side) Part 3: IAsyncResult Model (Server-Side) Part 4: Canceling Operations Part 5: Handling Exceptions [...]

By: Dan Rigsby » Async Operations in Wcf: Canceling Operations

Dan Rigsby » Async Operations in Wcf: Canceling Operations — Thu, 28 Aug 2008 19:51:30 +0000

[...] Posted by Dan Rigsby on March 30th, 2008 Async Operations in Wcf Series: Part 1: Event Based Model Part 2: IAsyncResult Model (Client-Side) Part 3: IAsyncResult Model (Server-Side) Part 4: Canceling Operations Part 5: Handling Exceptions [...]