Try-Catch doesn't show Message Dialog box with await

Question

The following code successfully gets data from a web service and displays it in a Windows 8 desktop app.

HttpClient client = new HttpClient();
HttpResponseMe         


        

Answer 1

Don't you need

string errorMessage = string.Empty;

try 
{

  HttpClient client = new HttpClient();
  HttpResponseMessage response = await    
  client.GetAsync("http://localhost:12345/api/items");

  var info = new List();

  if (response.IsSuccessStatusCode)
  {
    var content = await response.Content.ReadAsStringAsync();

    var item = JsonConvert.DeserializeObject(content);

    foreach (var data in item)
    {
        var infoSect = new SampleDataGroup
        (
            (string)data.Id.ToString(),
            (string)data.Name,
            (string)"",
            (string)data.PhotoUrl,
            (string)data.Description
        );
        info.Add(infoSect);
    }
  }
  else
  {
      errorMessage = "Error";
  }      
}    
catch (Exception ex)
{
  ErrorMessage = ex.Message;
}

if (errorMessage != string.Empty) 
{
  MessageDialog dlg = new MessageDialog(errorMessage);
  await dlg.ShowAsync();
}

?