Silverlight 4 drag and drop support

One of the new features of Silverlight 4 is drag-and-drop support. It is easy to use.

You can manage all drag-and-drop operations with three events.

1: // drag? Put? After I complete my tasks? Parts t

2:  media.Drop += doDrop;

3: // drag? Put? Why? Parts t

4:  media.DragEnter += doDragEnter;

5: // drag? Put? Jieáshu? Hour + thing? Parts t

6:  media.DragLeave += doDragLeave;

7:  

In the drop event. You can also drag and drop E. Data to the Silverlight file set and use the following code to get the file set:

1:  IDataObject dataObject = e.Data as IDataObject;

2:  FileInfo[] files = dataObject.GetData( DataFormats.FileDrop ) as FileInfo[];

3:  

After obtaining files, I can use recursion to list all files:

1:  foreach ( FileInfo file in files )

2:  {}

3:  

After obtaining fileinfo, we can drag and drop the extension of the file to perform corresponding operations. The following example shows how to drag and drop a XAML file and convert it into a uielement:

 1:  if ( file.Extension.Equals( ".xaml" ) )

 2:  {

 3:    string contents;

 4:    using ( Stream stream = file.OpenRead() )

 5:    {

 6:      using ( StreamReader reader = new StreamReader( stream ) )

 7:      {

 8:        contents = reader.ReadToEnd();

 9:      }

10:    }

11:    UIElement uiElement = XamlReader.Load( contents ) as UIElement;

12:    this.xamlViewer.Children.Add( uiElement );

13:  }

14:  

The operation is so simple!