OnBeforeCopy メソッド

ノードがクリップボードにコピーされる前に呼び出されます。

シンタックス

Visual Basic

'宣言
 
Protected Overridable Sub OnBeforeCopy( _
   ByVal e As BeforeCopyEventArgs _
) 

C#

protected virtual void OnBeforeCopy( 
   BeforeCopyEventArgs e
)

パラメータ

e

イベントのデータを含む System.EventArgs。

使用例

Visual Basic

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

    ' 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 = Me.ultraTree1.GetHashCode()

    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.
    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#

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;
}