Await in catch block

Question

I have the following code:

WebClient wc = new WebClient();
string result;
try
{
  result = await wc.DownloadStringTaskAsync( new Uri( \"http://badurl\" ) );
         


        

Answer 1

You could put the await after the catch block followed by a label, and put a goto in the try block. (No, really! Goto's aren't that bad!)

Answer 2

The pattern I use to rethrow the exception after await on a fallback task:

ExceptionDispatchInfo capturedException = null;
try
{
  await SomeWork();
}
catch (Exception e)
{
  capturedException = ExceptionDispatchInfo.Capture(e);
}

if (capturedException != null)
{
  await FallbackWork();
  capturedException.Throw();
}

Answer 3

Update: C# 6.0 supports await in catch

---

Old Answer: You can rewrite that code to move the await from the catch block using a flag:

WebClient wc = new WebClient();
string result = null;
bool downloadSucceeded;
try
{
  result = await wc.DownloadStringTaskAsync( new Uri( "http://badurl" ) );
  downloadSucceeded = true;
}
catch
{
  downloadSucceeded = false;
}

if (!downloadSucceeded)
  result = await wc.DownloadStringTaskAsync( new Uri( "http://fallbackurl" ) );