获取或设置当用户按 Esc 键时单击的按钮控件。 public: property System::Windows::Forms::IButtonControl ^ CancelButton { System::Windows::Forms::IButtonControl ^ get(); void set(System::Windows::Forms::IButtonControl ^ value); }; public System.Windows.Forms.IButtonControl CancelButton { get; set; } public System.Windows.Forms.IButtonControl? CancelButton { get; set; } member this.CancelButton : System.Windows.Forms.IButtonControl with get, set Public Property CancelButton As IButtonControl 属性值 IButtonControl IButtonControl,表示窗体的“取消”按钮。 示例 以下示例创建 的新实例 Form ,并调用 ShowDialog 方法将窗体显示为对话框。 该示例将 FormBorderStyle、AcceptButton、、CancelButtonMinimizeBox、 MaximizeBox和 StartPosition 属性设置为将窗体的外观和功能更改为对话框。 该示例还使用 Add 窗体集合的 Controls 方法添加两个 Button 控件。 该示例使用 HelpButton 属性在对话框的标题栏中显示帮助按钮。 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 注解 窗体的取消按钮是用户按 ESC 键时单击的按钮控件。 分配给此属性的按钮必须是 IButtonControl 位于当前窗体上或位于当前窗体的容器内的 。 此属性允许指定当用户在应用程序中按 ESC 键时发生的默认操作。 可以使用此属性,让用户只需按 ESC 键即可关闭窗口而不提交更改,而无需用鼠标手动单击“取消”按钮,从而允许用户快速导航简单窗体。 CancelButton 如果窗体上的另一个控件截获 ESC 键,则可能不起作用。 例如,如果在窗体上打开了 , ComboBox 则 ESC 会关闭 而不是 ComboBox 关闭窗体。 IButtonControl分配给 CancelButton 的对象必须在窗体上可见,否则按 ESC 键将不起作用。 适用于 另请参阅 AcceptButton IButtonControl