Silverlight with WCF

11-03-2009 2:27 AM |

 Dear Experts

i have created a WCF application and i added the WCF service to my silverlight application,

  ObservableCollection<SilverlightChartControls.AzureStorageService.DataEntity> newChartValues = new ObservableCollection<SilverlightChartControls.AzureStorageService.DataEntity>(); 

private void GeList()
        {
           
            AzureStorageService.AzureStorageServiceClient azureStorageClient = new SilverlightChartControls.AzureStorageService.AzureStorageServiceClient();
            azureStorageClient.GetDataCompleted += new EventHandler<SilverlightChartControls.AzureStorageService.GetDataCompletedEventArgs>(azureStorageClient_GetDataCompleted);
            azureStorageClient.GetDataAsync();
           
        }

        void azureStorageClient_GetDataCompleted(object sender, SilverlightChartControls.AzureStorageService.GetDataCompletedEventArgs e)
        {
     
            var data= e.Result;
          
            data.ToList<SilverlightChartControls.AzureStorageService.DataEntity>().ForEach(x => newChartValues.Add(x));

            populateChart();
        }

Here e.Result, i getting the list from the WCF , and in the next line am trying to add to my ObservableCollection called newChartValues,

But , In (x => newChartValues ) the first value is added , when adding second value its throwing an error called

 "ArugumentNullException was unhandled by user code
Value cannot be null.
Parameter name: category"

 

Can any tell me how to solve this,

Even i have see this link 

http://forums.silverlight.net/forums/t/97526.aspx, but cant fix my problem

Thanks in advance

Re: Silverlight with WCF

11-03-2009 3:40 AM |

Hi,

Just run fiddler when you request that service to see what the details are of the error.

Re: Silverlight with WCF

11-05-2009 3:37 AM |

Hi,

   It seems that your service returned you a null value. The invoking logic you posted here is nothing wrong. But it's not enough for us to judge the problem.

   You may upload your program to skydrive.live.com , if it's ok.  So that we can reproduce the program.

Best Regards