MenuItem.RadioCheck 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

取得或設定值，指出如果選取 MenuItem，是否顯示選項按鈕，而不顯示核取記號。

public:
 property bool RadioCheck { bool get(); void set(bool value); };

public bool RadioCheck { get; set; }

member this.RadioCheck : bool with get, set

Public Property RadioCheck As Boolean

屬性值

Boolean

如果使用選項按鈕，而不用核取記號，則為 true；功能表項目核取時顯示出標準的核取記號，則為 false。 預設為 false。

範例

下列程式碼範例會 Checked 使用 屬性來變更應用程式的狀態。 在此範例中，會提供一組功能表項目，用來指定控制項中文字的 TextBox 色彩。 在此範例中，提供的事件處理常式是由三個功能表項目的事件所 Click 使用。 每個功能表項目都會指定色彩、 menuItemRed 、 menuItemGreen 或 menuItemBlue 。 事件處理常式會決定按一下的功能表項目、將核取記號放在選取的功能表項目，以及變更表單控制項的 TextBox 文字色彩，名為 textBox1 。 此範例也會使用 RadioCheck 屬性來示範選項按鈕檢查如何用來顯示互斥的功能表項目。 這個範例會 System.Drawing 要求命名空間已新增至包含此程式碼的表單。

public:
   // This method is called from the constructor of the form to set up the menu items.
   void ConfigureMyMenus()
   {
      /* Set all of these menu items to Radio-Button check marks so the user can see 
         that only one color can be selected at a time. */
      menuItemRed->RadioCheck = true;
      menuItemBlue->RadioCheck = true;
      menuItemGreen->RadioCheck = true;
   }

private:
   // The following event handler would be connected to three menu items.
   void MyMenuClick( Object^ sender, EventArgs^ e )
   {
      if ( sender == menuItemBlue )
      {
         // Set the checkmark for the menuItemBlue menu item.
         menuItemBlue->Checked = true;
         // Uncheck the menuItemRed and menuItemGreen menu items.
         menuItemRed->Checked = false;
         menuItemGreen->Checked = false;
         // Set the color of the text in the TextBox control to Blue.
         textBox1->ForeColor = Color::Blue;
      }
      else if ( sender == menuItemRed )
      {
         // Set the checkmark for the menuItemRed menu item.
         menuItemRed->Checked = true;
         // Uncheck the menuItemBlue and menuItemGreen menu items.
         menuItemBlue->Checked = false;
         menuItemGreen->Checked = false;
         // Set the color of the text in the TextBox control to Red.
         textBox1->ForeColor = Color::Red;
      }
      else
      {
         // Set the checkmark for the menuItemGreen menu item.
         menuItemGreen->Checked = true;
         // Uncheck the menuItemRed and menuItemGreen menu items.
         menuItemBlue->Checked = false;
         menuItemRed->Checked = false;
         // Set the color of the text in the TextBox control to Blue.
         textBox1->ForeColor = Color::Green;
      }
   }

// This method is called from the constructor of the form to set up the menu items.
public void ConfigureMyMenus()
{
   /* Set all of these menu items to Radio-Button check marks so the user can see 
      that only one color can be selected at a time. */
   menuItemRed.RadioCheck = true;
   menuItemBlue.RadioCheck = true;
   menuItemGreen.RadioCheck = true;
}

// The following event handler would be connected to three menu items.
private void MyMenuClick(Object sender, EventArgs e)
{
   if(sender == menuItemBlue)
   {
      // Set the checkmark for the menuItemBlue menu item.
      menuItemBlue.Checked = true;
      // Uncheck the menuItemRed and menuItemGreen menu items.
      menuItemRed.Checked = false;
      menuItemGreen.Checked = false;
      // Set the color of the text in the TextBox control to Blue.
      textBox1.ForeColor = Color.Blue;
   }
   else if(sender == menuItemRed)
   {
      // Set the checkmark for the menuItemRed menu item.
      menuItemRed.Checked = true;
      // Uncheck the menuItemBlue and menuItemGreen menu items.
      menuItemBlue.Checked = false;
      menuItemGreen.Checked = false;
      // Set the color of the text in the TextBox control to Red.
      textBox1.ForeColor = Color.Red;
   }
   else
   {
     // Set the checkmark for the menuItemGreen menu item.
      menuItemGreen.Checked = true;
      // Uncheck the menuItemRed and menuItemGreen menu items.
      menuItemBlue.Checked = false;
      menuItemRed.Checked = false;
      // Set the color of the text in the TextBox control to Blue.
      textBox1.ForeColor = Color.Green;
   }
}

' This method is called from the constructor of the form to set up the menu
' items.
Public Sub ConfigureMyMenus()
    ' Set all of these menu items to Radio-Button check marks so the user
    ' can see that only one color can be selected at a time. 
    menuItemRed.RadioCheck = True
    menuItemBlue.RadioCheck = True
    menuItemGreen.RadioCheck = True
End Sub    

' The following event handler would be connected to three menu items.
Private Sub MyMenuClick(sender As Object, e As EventArgs)
    If sender Is menuItemBlue Then
        ' Set the checkmark for the menuItemBlue menu item.
        menuItemBlue.Checked = True
        ' Uncheck the menuItemRed and menuItemGreen menu items.
        menuItemRed.Checked = False
        menuItemGreen.Checked = False
        ' Set the color of the text in the TextBox control to Blue.
        textBox1.ForeColor = Color.Blue
    Else
        If sender Is menuItemRed Then
            ' Set the checkmark for the menuItemRed menu item.
            menuItemRed.Checked = True
            ' Uncheck the menuItemBlue and menuItemGreen menu items.
            menuItemBlue.Checked = False
            menuItemGreen.Checked = False
            ' Set the color of the text in the TextBox control to Red.
            textBox1.ForeColor = Color.Red
        Else
            ' Set the checkmark for the menuItemGreen menu item.
            menuItemGreen.Checked = True
            ' Uncheck the menuItemRed and menuItemGreen menu items.
            menuItemBlue.Checked = False
            menuItemRed.Checked = False
            ' Set the color of the text in the TextBox control to Blue.
            textBox1.ForeColor = Color.Green
        End If
    End If
End Sub

備註

核取記號不一定表示一組功能表項目的互斥狀態。 您可以使用這個屬性向使用者指出功能表項目的核取記號互斥。

另請參閱

• Checked