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Control.ControlAdded-Ereignis

Aktualisiert: November 2007

Tritt ein, wenn der Control.ControlCollection ein neues Steuerelement hinzugefügt wird.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

[BrowsableAttribute(true)]
public event ControlEventHandler ControlAdded
/** @event */
/** @attribute BrowsableAttribute(true) */
public void add_ControlAdded (ControlEventHandler value)
/** @event */
/** @attribute BrowsableAttribute(true) */
public void remove_ControlAdded (ControlEventHandler value)

JScript unterstützt keine Ereignisse.

Weitere Informationen über die Behandlung von Ereignissen finden Sie unter Behandeln von Ereignissen.

Im folgenden Codebeispiel wird mithilfe von ControlAdded einem Formular ein Steuerelement hinzugefügt und der Name des hinzugefügten Steuerelements in einer MessageBox angezeigt.

// This example demonstrates the use of the ControlAdded and
// ControlRemoved events. This example assumes that two Button controls
// are added to the form and connected to the addControl_Click and
// removeControl_Click event-handler methods.
private void Form1_Load(object sender, System.EventArgs e)
{
    // Connect the ControlRemoved and ControlAdded event handlers
    // to the event-handler methods.
    // ControlRemoved and ControlAdded are not available at design time.
    this.ControlRemoved += new System.Windows.Forms.ControlEventHandler(this.Control_Removed);
    this.ControlAdded += new System.Windows.Forms.ControlEventHandler(this.Control_Added);
}

private void Control_Added(object sender, System.Windows.Forms.ControlEventArgs e)
{
    MessageBox.Show("The control named " + e.Control.Name + " has been added to the form.");
}

private void Control_Removed(object sender, System.Windows.Forms.ControlEventArgs e)
{
    MessageBox.Show("The control named " + e.Control.Name + " has been removed from the form.");
}

// Click event handler for a Button control. Adds a TextBox to the form.
private void addControl_Click(object sender, System.EventArgs e)
{
    // Create a new TextBox control and add it to the form.
    TextBox textBox1 = new TextBox();
    textBox1.Size = new Size(100,10);
    textBox1.Location = new Point(10,10);
    // Name the control in order to remove it later. The name must be specified
    // if a control is added at run time.
    textBox1.Name = "textBox1";

    // Add the control to the form's control collection.
    this.Controls.Add(textBox1);
}

// Click event handler for a Button control.
// Removes the previously added TextBox from the form.
private void removeControl_Click(object sender, System.EventArgs e)
{
    // Loop through all controls in the form's control collection.
    foreach (Control tempCtrl in this.Controls)
    {
        // Determine whether the control is textBox1,
        // and if it is, remove it.
        if (tempCtrl.Name == "textBox1")
        {
            this.Controls.Remove(tempCtrl);
        }
    }
}


// This example demonstrates the use of the ControlAdded and
// ControlRemoved events. This example assumes that two Button controls
// are added to the form and connected to the addControl_Click and
// removeControl_Click event-handler methods.
private void Form1_Load(Object sender, System.EventArgs e)
{
    // Connect the ControlRemoved and ControlAdded event handlers
    // to the event-handler methods.
    // ControlRemoved and ControlAdded are not available at design time.
    this.add_ControlRemoved(new System.Windows.Forms.
        ControlEventHandler(this.Control_Removed));
    this.add_ControlAdded(new System.Windows.Forms.
        ControlEventHandler(this.Control_Added));
} //Form1_Load

private void Control_Added(Object sender, System.Windows.Forms.
    ControlEventArgs e)
{
    MessageBox.Show("The control named " + e.get_Control().get_Name() 
        + " has been added to the form.");
} //Control_Added

private void Control_Removed(Object sender, System.Windows.Forms.
    ControlEventArgs e)
{
    MessageBox.Show("The control named " + e.get_Control().get_Name() 
        + " has been removed from the form.");
} //Control_Removed

// Click event handler for a Button control. Adds a TextBox to the form.
private void addControl_Click(Object sender, System.EventArgs e)
{
    // Create a new TextBox control and add it to the form.
    TextBox textBox1 = new TextBox();
    textBox1.set_Size(new Size(100, 10));
    textBox1.set_Location(new Point(10, 10));

    // Name the control in order to remove it later. 
    // The name must be specified
    // if a control is added at run time.
    textBox1.set_Name("textBox1");

    // Add the control to the form's control collection.
    this.get_Controls().Add(textBox1);
} //addControl_Click

// Click event handler for a Button control.
// Removes the previously added TextBox from the form.
private void removeControl_Click(Object sender, System.EventArgs e)
{
    // Loop through all controls in the form's control collection.
    for (int iCtr = 0; iCtr < this.get_Controls().get_Count(); iCtr++) {
        Control tempCtrl = this.get_Controls().get_Item(iCtr);

        // Determine whether the control is textBox1,
        // and if it is, remove it.
        if (tempCtrl.get_Name().Equals("textBox1")) {
            this.get_Controls().Remove(tempCtrl);
        }
    }
} //removeControl_Click


Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

.NET Framework und .NET Compact Framework unterstützen nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen für .NET Framework.

.NET Framework

Unterstützt in: 3.5, 3.0, 2.0, 1.1, 1.0

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