ContextMenuStrip.SourceControl ContextMenuStrip.SourceControl ContextMenuStrip.SourceControl ContextMenuStrip.SourceControl Property

Definition

Ruft das letzte Steuerelement ab, durch das dieser ContextMenuStrip angezeigt wurde.Gets the last control that caused this ContextMenuStrip to be displayed.

public:
 property System::Windows::Forms::Control ^ SourceControl { System::Windows::Forms::Control ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.Control SourceControl { get; }
member this.SourceControl : System.Windows.Forms.Control
Public ReadOnly Property SourceControl As Control

Eigenschaftswert

Das Steuerelement, durch das dieser ContextMenuStrip angezeigt wurde.The control that caused this ContextMenuStrip to be displayed.

Beispiele

Im folgenden Codebeispiel wird die SourceControl dynamische Bestimmung der Wiederverwendung und die Opening Behandlung des-Ereignisses veranschaulicht.The following code example demonstrates dynamic SourceControl determination with reuse, and handling of the Opening event. Dieses Beispiel ist Teil eines größeren Beispiels, das für die ContextMenuStrip -Klasse bereitgestellt wird.This example is part of a larger example provided for the ContextMenuStrip class.

// This event handler is invoked when the ContextMenuStrip
// control's Opening event is raised. It demonstrates
// dynamic item addition and dynamic SourceControl 
// determination with reuse.
void cms_Opening(object sender, System.ComponentModel.CancelEventArgs e)
{
    // Acquire references to the owning control and item.
    Control c = fruitContextMenuStrip.SourceControl as Control;
    ToolStripDropDownItem tsi = fruitContextMenuStrip.OwnerItem as ToolStripDropDownItem;

    // Clear the ContextMenuStrip control's Items collection.
    fruitContextMenuStrip.Items.Clear();

    // Check the source control first.
    if (c != null)
    {
        // Add custom item (Form)
        fruitContextMenuStrip.Items.Add("Source: " + c.GetType().ToString());
    }
    else if (tsi != null)
    {
        // Add custom item (ToolStripDropDownButton or ToolStripMenuItem)
        fruitContextMenuStrip.Items.Add("Source: " + tsi.GetType().ToString());
    }

    // Populate the ContextMenuStrip control with its default items.
    fruitContextMenuStrip.Items.Add("-");
    fruitContextMenuStrip.Items.Add("Apples");
    fruitContextMenuStrip.Items.Add("Oranges");
    fruitContextMenuStrip.Items.Add("Pears");

    // Set Cancel to false. 
    // It is optimized to true based on empty entry.
    e.Cancel = false;
}
' This event handler is invoked when the ContextMenuStrip
' control's Opening event is raised. It demonstrates
' dynamic item addition and dynamic SourceControl 
' determination with reuse.
 Sub cms_Opening(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs)

     ' Acquire references to the owning control and item.
     Dim c As Control = fruitContextMenuStrip.SourceControl
     Dim tsi As ToolStripDropDownItem = fruitContextMenuStrip.OwnerItem 

     ' Clear the ContextMenuStrip control's 
     ' Items collection.
     fruitContextMenuStrip.Items.Clear()

     ' Check the source control first.
     If (c IsNot Nothing) Then
         ' Add custom item (Form)
         fruitContextMenuStrip.Items.Add(("Source: " + c.GetType().ToString()))
     ElseIf (tsi IsNot Nothing) Then
         ' Add custom item (ToolStripDropDownButton or ToolStripMenuItem)
         fruitContextMenuStrip.Items.Add(("Source: " + tsi.GetType().ToString()))
     End If

     ' Populate the ContextMenuStrip control with its default items.
     fruitContextMenuStrip.Items.Add("-")
     fruitContextMenuStrip.Items.Add("Apples")
     fruitContextMenuStrip.Items.Add("Oranges")
     fruitContextMenuStrip.Items.Add("Pears")

     ' Set Cancel to false. 
     ' It is optimized to true based on empty entry.
     e.Cancel = False
 End Sub

Hinweise

Die SourceControl -Eigenschaft enthält häufig folgende Verwendungsmöglichkeiten:Common uses of the SourceControl property include the following:

  • Hinzufügen, entfernen, aktivieren oder Deaktivieren eines Menü Elements während des Opening Ereignisses.Adding, removing, enabling, or disabling a menu item during the Opening event.

  • Festlegen der Änderungen eines ausgewählten Befehls basierend auf dem Steuerelement, das zuletzt angezeigt ContextMenuStripwurde.Deciding on modifications of a chosen command based on the control that last displayed the ContextMenuStrip.

Sicherheit

UIPermission
für alle Fenster, um diesen Eigenschafts Wert festzulegen.for all windows to set this property value. Zugehörige Enumeration:AllWindowsAssociated enumeration: AllWindows

Gilt für: