C# 如何重写userControl属性

IDE:C.net、WINFORMS、.NET4.0

Hi已经创建了一个userControl，我想创建一个属性，如果启用的user control为false，则将back Image更改为imgDisabled.jpg else imgEnabled.jpg

请告诉我如何覆盖usercontrol的Enabled属性并将此函数添加到其中

  private void onPropertyChanged()
    {
        if (this.Enabled)
            this.BackgroundImage = Properties.Resources.imgEnabled;
        else
            this.BackgroundImage = Properties.Resources.imgDisabled;
    }

重写基本控件类的虚拟OnEnabledChanged方法：

---

请使用像这样的活动litner

类CustomProperty:Property { 公共事件处理程序选择已更改

private int _selectionStart;
private int _selectionLength;

protected override void OnMouseDown(MouseEventArgs e)
{
    _selectionStart = SelectionStart;
    _selectionLength = SelectionLength;

    base.OnMouseDown(e);
}

protected override void OnMouseUp(MouseEventArgs e)
{
    if (null != SelectionChanged && (_selectionStart != SelectionStart || _selectionLength != SelectionLength))
        SelectionChanged(this, EventArgs.Empty);

    base.OnMouseUp(e);
}

}

private int _selectionStart;
private int _selectionLength;

protected override void OnMouseDown(MouseEventArgs e)
{
    _selectionStart = SelectionStart;
    _selectionLength = SelectionLength;

    base.OnMouseDown(e);
}

protected override void OnMouseUp(MouseEventArgs e)
{
    if (null != SelectionChanged && (_selectionStart != SelectionStart || _selectionLength != SelectionLength))
        SelectionChanged(this, EventArgs.Empty);

    base.OnMouseUp(e);
}