CloudUpload return an error

[Benedikt]

Hey guys,

I'm currently using the CloudUpload to upload files to an internal server.
This happens over multiple single steps in clsDaten.UploadReklamationsDateienKEMdoc.
This would return a true if succesfull uploaded and a false, as well as an error message if not.
I now want to show this error message in the interface and an Error sign instead of the succesfull check.
But I dont find anywhere how.

Does anyone have an idea?

Greetings Benedikt

    public class clsCloudUploadProvider : ICloudUploadProvider
    {
		long uploadFilesCount = 0;

		clsReklamation Reklamation;

		public Task<object> UploadFileAsync(string fileName, Stream fileStream, CloudUploadFileProgressChanged uploadProgressChanged, CancellationToken cancellationToken)
		{
			return Task.Factory.StartNew<object>(() => UploadFile(fileName, fileStream, uploadProgressChanged, cancellationToken), cancellationToken);
		}

		private object UploadFile(string fileName, Stream fileStream, CloudUploadFileProgressChanged uploadProgressChanged, CancellationToken cancellationToken)
		{
			this.uploadFilesCount++;
			var fileLength = fileStream.Length;

			uploadProgressChanged(fileLength);

			object[] ImportState = Import(fileStream, fileName);

			if ((bool)ImportState[0])
			{
				return fileName;
			}
			else
			{
				return null;
            }
		}

		public object[] Import(Stream filestream, string filename)
		{
			return clsDaten.UploadReklamationsDateienKEMdoc(Reklamation, (filestream as FileStream).Name);
		}

		public clsCloudUploadProvider(clsReklamation reklamation)
		{
			Reklamation = reklamation;
		}
	}

[Martin Ivanov]

Hello Benedikt,

There is no direct API to mark the uploading file as failed, but you can use the following custom code:

private voidRadCloudUpload_ItemStateChanged(object sender, Telerik.Windows.Cloud.Controls.Upload.CloudUploadFileStateChangedEventArgs e)
 {
     if (e.NewState == CloudUploadFileState.Uploaded && e.Item.UploadResult == null) // this means that the UploadFile method in your provider returned null at some point
 {
         var methodInfo = typeof(CloudUploadFile).GetMethod("SetState", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
         methodInfo.Invoke(e.Item, new object[1] { CloudUploadFileState.Failed });

        // you can use this code if you want to change the default tooltip of the state icon
 var container = cloudUploadList.ItemContainerGenerator.ContainerFromItem(e.Item);
         var notificationIcon = container.ChildrenOfType<Grid>().FirstOrDefault(x => x.Name == "NotificationIcon");
 notificationIcon.ToolTip = "File upload failed";
 }            
 }

You can use the ItemStateChanged event which will be invoked when you return the null valuein your UploadFile method. In this case the e.Item.UploadResult will be null, which you can use to indicate if the item should be marked as failed. Then, you can set its State to Failed and update the tooltip of the visual item if needed.

I hope this helps.

Regards,
Martin Ivanov
Progress Telerik

[Benedikt]

Hi Martin,

works exactly as I wanted,

thank you :)