Form.HelpButton 屬性
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得或設定值，指出是否應在表單的標題方塊中顯示 [說明] 按鈕。
public:
property bool HelpButton { bool get(); void set(bool value); };public bool HelpButton { get; set; }member this.HelpButton : bool with get, setPublic Property HelpButton As Boolean屬性值
若要在表單的標題列中顯示 [說明] 按鈕，則為 true，否則為 false。 預設為 false。
範例
下列範例會建立 的新 實例 Form ，並呼叫 ShowDialog 方法，將表單顯示為對話方塊。 此範例會將 FormBorderStyle 、 AcceptButton 、 CancelButton 、 MinimizeBox 、 MaximizeBox 和 StartPosition 屬性設定為將表單的外觀和功能變更為對話方塊。 此範例也會使用 Add 表單集合的 Controls 方法來加入兩 Button 個控制項。 此範例會 HelpButton 使用 屬性，在對話方塊的標題列中顯示 [說明] 按鈕。
public:
void CreateMyForm()
{
// Create a new instance of the form.
Form^ form1 = gcnew Form;
// Create two buttons to use as the accept and cancel buttons.
Button^ button1 = gcnew Button;
Button^ button2 = gcnew Button;
// Set the text of button1 to "OK".
button1->Text = "OK";
// Set the position of the button on the form.
button1->Location = Point(10,10);
// Set the text of button2 to "Cancel".
button2->Text = "Cancel";
// Set the position of the button based on the location of button1.
button2->Location =
Point( button1->Left, button1->Height + button1->Top + 10 );
// Set the caption bar text of the form.
form1->Text = "My Dialog Box";
// Display a help button on the form.
form1->HelpButton = true;
// Define the border style of the form to a dialog box.
form1->FormBorderStyle = ::FormBorderStyle::FixedDialog;
// Set the MaximizeBox to false to remove the maximize box.
form1->MaximizeBox = false;
// Set the MinimizeBox to false to remove the minimize box.
form1->MinimizeBox = false;
// Set the accept button of the form to button1.
form1->AcceptButton = button1;
// Set the cancel button of the form to button2.
form1->CancelButton = button2;
// Set the start position of the form to the center of the screen.
form1->StartPosition = FormStartPosition::CenterScreen;
// Add button1 to the form.
form1->Controls->Add( button1 );
// Add button2 to the form.
form1->Controls->Add( button2 );
// Display the form as a modal dialog box.
form1->ShowDialog();
}
public void CreateMyForm()
{
// Create a new instance of the form.
Form form1 = new Form();
// Create two buttons to use as the accept and cancel buttons.
Button button1 = new Button ();
Button button2 = new Button ();
// Set the text of button1 to "OK".
button1.Text = "OK";
// Set the position of the button on the form.
button1.Location = new Point (10, 10);
// Set the text of button2 to "Cancel".
button2.Text = "Cancel";
// Set the position of the button based on the location of button1.
button2.Location
= new Point (button1.Left, button1.Height + button1.Top + 10);
// Set the caption bar text of the form.
form1.Text = "My Dialog Box";
// Display a help button on the form.
form1.HelpButton = true;
// Define the border style of the form to a dialog box.
form1.FormBorderStyle = FormBorderStyle.FixedDialog;
// Set the MaximizeBox to false to remove the maximize box.
form1.MaximizeBox = false;
// Set the MinimizeBox to false to remove the minimize box.
form1.MinimizeBox = false;
// Set the accept button of the form to button1.
form1.AcceptButton = button1;
// Set the cancel button of the form to button2.
form1.CancelButton = button2;
// Set the start position of the form to the center of the screen.
form1.StartPosition = FormStartPosition.CenterScreen;
// Add button1 to the form.
form1.Controls.Add(button1);
// Add button2 to the form.
form1.Controls.Add(button2);
// Display the form as a modal dialog box.
form1.ShowDialog();
}
Public Sub CreateMyForm()
' Create a new instance of the form.
Dim form1 As New Form()
' Create two buttons to use as the accept and cancel buttons.
Dim button1 As New Button()
Dim button2 As New Button()
' Set the text of button1 to "OK".
button1.Text = "OK"
' Set the position of the button on the form.
button1.Location = New Point(10, 10)
' Set the text of button2 to "Cancel".
button2.Text = "Cancel"
' Set the position of the button based on the location of button1.
button2.Location = _
New Point(button1.Left, button1.Height + button1.Top + 10)
' Set the caption bar text of the form.
form1.Text = "My Dialog Box"
' Display a help button on the form.
form1.HelpButton = True
' Define the border style of the form to a dialog box.
form1.FormBorderStyle = FormBorderStyle.FixedDialog
' Set the MaximizeBox to false to remove the maximize box.
form1.MaximizeBox = False
' Set the MinimizeBox to false to remove the minimize box.
form1.MinimizeBox = False
' Set the accept button of the form to button1.
form1.AcceptButton = button1
' Set the cancel button of the form to button2.
form1.CancelButton = button2
' Set the start position of the form to the center of the screen.
form1.StartPosition = FormStartPosition.CenterScreen
' Add button1 to the form.
form1.Controls.Add(button1)
' Add button2 to the form.
form1.Controls.Add(button2)
' Display the form as a modal dialog box.
form1.ShowDialog()
End Sub
備註
當此屬性設定為 true 時，具有問號的小按鈕會出現在 [關閉] 按鈕左邊的標題列中。 您可以使用此按鈕來顯示應用程式的說明。 您可以為事件建立事件處理常式， HelpRequested 以在按一下表單的 [說明] 按鈕時向使用者顯示 [說明] 資訊。
若要顯示 [說明] 按鈕，表單的 ControlBox 屬性值必須是 true ，其預設值。 屬性 ControlBox 會決定標題列的右上角是否包含最大化按鈕、最小化按鈕、說明按鈕和關閉按鈕等控制項。 此外，您也必須將表單的 FormBorderStyle 屬性設定為 FormBorderStyle.FixedSingle 、 FormBorderStyle.Sizable 、 FormBorderStyle.Fixed3D 或 FormBorderStyle.FixedDialog 。
重要
如果顯示[最大化] 或 [最小化] 按鈕，則會忽略 屬性的值 HelpButton 。
