Form.StartPosition 属性

定义

获取或设置运行时窗体的起始位置。Gets or sets the starting position of the form at run time.

public:
 property System::Windows::Forms::FormStartPosition StartPosition { System::Windows::Forms::FormStartPosition get(); void set(System::Windows::Forms::FormStartPosition value); };
public System.Windows.Forms.FormStartPosition StartPosition { get; set; }
member this.StartPosition : System.Windows.Forms.FormStartPosition with get, set
Public Property StartPosition As FormStartPosition

属性值

FormStartPosition,表示窗体的起始位置。A FormStartPosition that represents the starting position of the form.

异常

指定值不在有效值范围内。The value specified is outside the range of valid values.

示例

下面的示例创建 Form 的新实例,并调用 ShowDialog 方法将窗体显示为对话框。The following example creates a new instance of a Form and calls the ShowDialog method to display the form as a dialog box. 该示例将设置 "FormBorderStyle"、"AcceptButton"、"CancelButton" 和 "StartPosition" 属性,以便将窗体的外观和功能更改为对话框。The example sets the FormBorderStyle, AcceptButton, CancelButton, and StartPosition properties to change the appearance and functionality of the form to a dialog box. 该示例还使用窗体的 Controls 集合的 Add 方法来添加两个 Button 控件。The example also uses the Add method of the form's Controls collection to add two Button controls. 该示例使用 HelpButton 属性在对话框的标题栏中显示 "帮助" 按钮。The example uses the HelpButton property to display a help button in the caption bar of the dialog box.

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 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 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 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

此属性使您可以设置在运行时显示窗体的起始位置。This property enables you to set the starting position of the form when it is displayed at run time. 可以通过设置 Location 属性来手动指定窗体的位置,也可以使用 Windows 指定的默认位置。The form's position can be specified manually by setting the Location property or use the default location specified by Windows. 您还可以将窗体放置在屏幕的中心或窗体的父窗体中心(如多文档界面(MDI)子窗体)中显示。You can also position the form to display in the center of the screen or in the center of its parent form for forms such as multiple-document interface (MDI) child forms.

应在显示窗体之前设置此属性。This property should be set before the form is shown. 可以在调用 ShowShowDialog 方法之前或在窗体的构造函数中设置此属性。You can set this property before you call the Show or ShowDialog method or in your form's constructor.

适用于

另请参阅