Occurs before selected nodes are copied to the clipboard.
Syntax
Example
The following sample code illustrates some of the information available in the BeforeCopy event.
For an overview of how to handle events in Visual Basic or Visual C#, see
Event Handlers in Visual Basic and Visual C#. For specific information and code examples illustrating how to consume events in your application, see
Consuming Events in the
.NET Framework Developer's Guide.
| Visual Basic |  Copy Code |
|---|
Imports Infragistics.Win
Imports Infragistics.Win.UltraWinTree
Private Sub ultraTree1_BeforeCopy(ByVal sender As Object, ByVal e As Infragistics.Win.UltraWinTree.BeforeCopyEventArgs) Handles ultraTree1.BeforeCopy
Dim sb As New System.Text.StringBuilder()
Dim node As UltraTreeNode
Dim dr As DialogResult
e.Nodes.Tag = Me.ultraTree1.GetHashCode()
sb.Append("The following nodes are about to be copied to the clipboard: ")
For Each node In e.Nodes
sb.Append(node.Text)
sb.Append(", ")
Next
sb.Append(" Press ''OK'' or ''Cancel''.")
dr = MessageBox.Show(Me, sb.ToString(), "Copying nodes to the clipboard", MessageBoxButtons.OKCancel)
If dr = DialogResult.Cancel Then
e.Cancel = True
End If
End Sub
|
| C# | Copy Code |
|---|
using System.Diagnostics;
using Infragistics.Win;
using Infragistics.Win.UltraWinTree;
private void ultraTree1_BeforeCopy(object sender, Infragistics.Win.UltraWinTree.BeforeCopyEventArgs e)
{
// Setting the Tag of the Nodes collection passed into the
BeforeCut
// and BeforeCopy events to some serializable value can be used
to
// identify the tree that copied the nodes to the clipboard. This
Tag
// value will be de-serialized and set on the Nodes collection
that is
// passed into the BeforePaste event. This can be used for
preventing
// paste operations between trees.
// Set the Tag property on the Nodes collection to the tree's hash
code.
// Note: don't set the tag to the tree itself since that isn't
serializable
e.Nodes.Tag = this.ultraTree1.GetHashCode();
System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.Append("The following nodes are about to be copied to the
clipboard: ");
// Loop over the nodes that will be copied to the clipboard.
// Note: The Nodes collection exposed by the event args
// is read-only.
foreach ( UltraTreeNode node
in e.Nodes )
{
sb.Append( node.Text );
sb.Append( ", " );
}
sb.Append(" Press ''OK'' or ''Cancel''.");
DialogResult dr = MessageBox.Show( this,
sb.ToString(),
"Copying
nodes to the clipboard",
MessageBoxButtons.OKCancel
);
if ( dr == DialogResult.Cancel )
e.Cancel = true;
} |
See Also
