Control.Show 方法

项目
08/17/2007

向用户显示控件。

**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）

语法

声明
Public Sub Show
用法
Dim instance As Control

instance.Show

public void Show ()

public:
void Show ()

public void Show ()

public function Show ()

备注

显示控件等效于将 Visible 属性设置为 true。在调用 Show 方法之后，只要不调用 Hide 方法，Visible 属性就返回 true 值。

示例

下面的代码示例显示一个“关于”对话框并在其图面临时绘制了一个蓝色正方形。该示例要求已定义了一个从 Form 派生的、名为 AboutDialog 的类。

Private Sub menuItemHelpAbout_Click(sender As Object, _
  e As EventArgs) Handles menuItemHelpAbout.Click
   ' Create and display a modless about dialog box.
   Dim about As New AboutDialog()
   about.Show()
   
   ' Draw a blue square on the form.
   ' NOTE: This is not a persistent object, it will no longer be
   ' visible after the next call to OnPaint. To make it persistent, 
   ' override the OnPaint method and draw the square there 
   Dim g As Graphics = about.CreateGraphics()
   g.FillRectangle(Brushes.Blue, 10, 10, 50, 50)
End Sub

private void menuItemHelpAbout_Click(object sender, EventArgs e)
{
   // Create and display a modless about dialog box.
   AboutDialog about = new AboutDialog();
   about.Show();

   // Draw a blue square on the form.
   /* NOTE: This is not a persistent object, it will no longer be
      * visible after the next call to OnPaint. To make it persistent, 
      * override the OnPaint method and draw the square there */
   Graphics g = about.CreateGraphics();
   g.FillRectangle(Brushes.Blue, 10, 10, 50, 50);
}

private:
   void menuItemHelpAbout_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      // Create and display a modeless about dialog box.
      AboutDialog^ about = gcnew AboutDialog;
      about->Show();
      
      // Draw a blue square on the form.
      /* NOTE: This is not a persistent object, it will no longer be
                  * visible after the next call to OnPaint. To make it persistent,
                  * override the OnPaint method and draw the square there */
      Graphics^ g = about->CreateGraphics();
      g->FillRectangle( Brushes::Blue, 10, 10, 50, 50 );
   }

private void menuItemHelpAbout_Click(Object sender, EventArgs e)
{
    // Create and display a modless about dialog box.
    AboutDialog about = new AboutDialog();
    about.Show();

    // Draw a blue square on the form.
    /* NOTE: This is not a persistent object, it will no longer be
       visible after the next call to OnPaint. To make it persistent, 
       override the OnPaint method and draw the square there 
     */
    Graphics g = about.CreateGraphics();
    g.FillRectangle(Brushes.get_Blue(), 10, 10, 50, 50);
} //menuItemHelpAbout_Click

平台

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

通过

Control.Show 方法

语法

备注

示例

平台

版本信息

.NET Framework

.NET Compact Framework

请参见

参考

其他资源