ValidateEvent handler in UI for Silverlight

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ValidateEvent handler

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This is a migrated thread and some comments may be shown as answers.

Radu asked on 07 Jun 2011, 01:03 PM

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Fixed by adding reference to

using Telerik.Windows;

as in http://www.telerik.com/community/forums/silverlight/menu/silverlight-3.aspx

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Hello,
I was trying to add item validation to the RadUpload. The XAML control is called RadUpload1. I have coded the snippet from the official documentation from http://www.telerik.com/help/silverlight/radupload-features-upload-validation.html and I noticed my version has a different number of attributes :

       RadUpload1.AddHandler( RadUploadItem.ValidateEvent, new UploadValidateEventHandler( RadUploadItem_OnValidate ), false );

instead of the one in your documentation:
radUpload.AddHandler(RadUploadItem.ValidateEvent, new UploadValidateEventHandler(OnValidate));
...
My handler implementation:

private void RadUploadItem_OnValidate( object sender, UploadValidateEventArgs e ) {

string fileExtension = ( e.OriginalSource as RadUploadItem ).FileName;

if( !fileExtension.EndsWith( ".csv" ) || !fileExtension.EndsWith( ".txt" ) ) {

e.ErrorMessage = "Cannot upload this image! Please select either a Comma Separated Value (csv) or a Text (txt) file.";

e.Cancel = true;

}

When implementing the handler as above I get this error at design time:

The best overloaded method match for 'System.Windows.UIElement.AddHandler(System.Windows.RoutedEvent, System.Delegate, bool)' has some invalid arguments

Side suggestion : mark in the documentation also the version of controls to which it reffers and add links for previous versions documentation.

Regards,
Radu

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