2006/5/13
考试考得差不多了，看了一些书，参考了一下MSDN，有很多收获： Form.DialogResult属性 （表示当窗体用作对话框时该窗体的结果。）
窗体的对话框结果是当窗体显示为模式对话框时，从该窗体返回的值。如果该窗体显示为对话框，用来自 DialogResult 枚举的值设置此属性可以为该窗体设置对话框结果的值、隐藏该模式对话框并将控件返回到调用窗体。此属性通常由窗体上 Button 控件的 DialogResult 属性设置。当用户单击 Button 控件时，分配给 Button 的 DialogResult 属性的值将分配给该窗体的 DialogResult 属性。
当窗体显示为模式对话框时，单击“关闭”按钮（窗体右上角带 X 的按钮）将使窗体隐藏，并使 DialogResult 属性设置为 DialogResult.Cancel。当用户单击对话框的“关闭”按钮或设置 DialogResult 属性的该值时，不自动调用 Close 方法。而是隐藏该窗体并可重新显示该窗体，而不用创建该对话框的新实例。因为此行为，所以当应用程序不再需要该窗体时，必须调用该窗体的 Dispose 方法。
可以使用此属性确定对话框是如何关闭的，以便正确处理在该对话框中执行的操作。
注意 通过在窗体的 Closing 事件的事件处理程序中设置 DialogResult 属性，可以重写用户单击“关闭”按钮时分配给 DialogResult 属性的值。
注意 如果 Form 显示为无模式窗口，则 DialogResult 属性返回的值可能不返回分配给该窗体的值，因为关闭该窗体时将自动释放该窗体的资源。
[C#]
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public void CreateMyForm()
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...{
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// Create a new instance of the form.
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Form form1 = new Form();
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// Create two buttons to use as the accept and cancel buttons.
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Button button1 = new Button ();
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Button button2 = new Button ();
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// Set the text of button1 to "OK".
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button1.Text = "OK";
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// Set the position of the button on the form.
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button1.Location = new Point (10, 10);
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// Set the text of button2 to "Cancel".
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button2.Text = "Cancel";
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// Set the position of the button based on the location of button1.
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button2.Location
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= new Point (button1.Left, button1.Height + button1.Top + 10);
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// Make button1's dialog result OK.
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button1.DialogResult = DialogResult.OK;
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// Make button2's dialog result Cancel.
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button2.DialogResult = DialogResult.Cancel;
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// Set the caption bar text of the form.
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form1.Text = "My Dialog Box";
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// Define the border style of the form to a dialog box.
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form1.FormBorderStyle = FormBorderStyle.FixedDialog;
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// Set the accept button of the form to button1.
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form1.AcceptButton = button1;
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// Set the cancel button of the form to button2.
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form1.CancelButton = button2;
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// Set the start position of the form to the center of the screen.
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form1.StartPosition = FormStartPosition.CenterScreen;
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// Add button1 to the form.
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form1.Controls.Add(button1);
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// Add button2 to the form.
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form1.Controls.Add(button2);
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// Display the form as a modal dialog box.
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form1.ShowDialog();
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// Determine if the OK button was clicked on the dialog box.
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if (form1.DialogResult == DialogResult.OK)
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...{
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// Display a message box indicating that the OK button was clicked.
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MessageBox.Show("The OK button on the form was clicked.");
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// Optional: Call the Dispose method when you are finished with the dialog box.
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form1.Dispose();
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}
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else
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...{
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// Display a message box indicating that the Cancel button was clicked.
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MessageBox.Show("The Cancel button on the form was clicked.");
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// Optional: Call the Dispose method when you are finished with the dialog box.
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form1.Dispose();
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}
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}
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[Visual Basic]
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Public Sub CreateMyForm()Sub CreateMyForm()
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' Create a new instance of the form.
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Dim form1 As New Form()
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' Create two buttons to use as the accept and cancel buttons.
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Dim button1 As New Button()
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Dim button2 As New Button()
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' Set the text of button1 to "OK".
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button1.Text = "OK"
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' Set the position of the button on the form.
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button1.Location = New Point(10, 10)
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' Set the text of button2 to "Cancel".
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button2.Text = "Cancel"
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' Set the position of the button based on the location of button1.
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button2.Location = New Point(button1.Left, button1.Height + button1.Top + 10)
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' Make button1's dialog result OK.
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button1.DialogResult = DialogResult.OK
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' Make button2's dialog result Cancel.
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button2.DialogResult = DialogResult.Cancel
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' Set the caption bar text of the form.
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form1.Text = "My Dialog Box"
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' Define the border style of the form to a dialog box.
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form1.FormBorderStyle = FormBorderStyle.FixedDialog
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' Set the accept button of the form to button1.
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form1.AcceptButton = button1
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' Set the cancel button of the form to button2.
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form1.CancelButton = button2
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' Set the start position of the form to the center of the screen.
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form1.StartPosition = FormStartPosition.CenterScreen
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' Add button1 to the form.
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form1.Controls.Add(button1)
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' Add button2 to the form.
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form1.Controls.Add(button2)
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' Display the form as a modal dialog box.
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form1.ShowDialog()
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' Determine if the OK button was clicked on the dialog box.
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If form1.DialogResult = DialogResult.OK Then
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' Display a message box indicating that the OK button was clicked.
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MessageBox.Show("The OK button on the form was clicked.")
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' Optional: Call the Dispose method when you are finished with the dialog box.
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form1.Dispose
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' Display a message box indicating that the Cancel button was clicked.
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Else
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MessageBox.Show("The Cancel button on the form was clicked.")
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' Optional: Call the Dispose method when you are finished with the dialog box.
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form1.Dispose
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End If
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End Sub 'CreateMyForm
ListView.Activation属性
Activation 属性允许您指定用户激活 ListView 控件中的项的方式。激活 ListView 中的项与只选择项是不同的。当激活某个项时，通常会在 ItemActivate 事件的事件处理程序中执行一个操作。例如，当激活某个项时，您可能会打开一个文件或显示一个允许用户对项进行编辑的对话框。通常，项的激活是通过用户对它进行双击来实现的。如果 Activation 属性设置为 ItemActivation.OneClick，那么单击该项一次即可将其激活。将 Activation 属性设置为 ItemActivation.TwoClick 与标准的双击不同，这是因为两次单击之间的时间间隔可以是任意的。
注意 如果将 Activation 属性设置为 ItemActivation.OneClick 或 ItemActivation.TwoClick，则不管 LabelEdit 属性的值是什么，都不允许进行标签编辑。
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