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http://dev.21tx.com 2006年05月16日  

 
 
 
 


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Form.DialogResult屬性 （表示當窗體用作對話框時該窗體的結果。） 

窗體的對話框結果是當窗體顯示為模式對話框時，從該窗體返回的值。如果該窗體顯示為對話框，用來自 DialogResult 枚舉的值設置此屬性可以為該窗體設置對話框結果的值、隱藏該模式對話框并將控件返回到調用窗體。此屬性通常由窗體上 Button 控件的 DialogResult 屬性設置。當用戶單擊 Button 控件時，分配給 Button 的 DialogResult 屬性的值將分配給該窗體的 DialogResult 屬性。

當窗體顯示為模式對話框時，單擊“關閉”按鈕（窗體右上角帶 X 的按鈕）將使窗體隱藏，并使 DialogResult 屬性設置為 DialogResult.Cancel。當用戶單擊對話框的“關閉”按鈕或設置 DialogResult 屬性的該值時，不自動調用 Close 方法。而是隱藏該窗體并可重新顯示該窗體，而不用創建該對話框的新實例。因為此行為，所以當應用程序不再需要該窗體時，必須調用該窗體的 Dispose 方法。

可以使用此屬性確定對話框是如何關閉的，以便正確處理在該對話框中執行的操作。

注意   通過在窗體的 Closing 事件的事件處理程序中設置 DialogResult 屬性，可以重寫用戶單擊“關閉”按鈕時分配給 DialogResult 屬性的值。
注意   如果 Form 顯示為無模式窗口，則 DialogResult 屬性返回的值可能不返回分配給該窗體的值，因為關閉該窗體時將自動釋放該窗體的資源。

[C#]

 1public void CreateMyForm()
2 ...{
3    // Create a new instance of the form.
4    Form form1 = new Form();
5    // Create two buttons to use as the accept and cancel buttons.
6    Button button1 = new Button ();
7    Button button2 = new Button ();
8   
9    // Set the text of button1 to "OK".
10    button1.Text = "OK";
11    // Set the position of the button on the form.
12    button1.Location = new Point (10, 10);
13    // Set the text of button2 to "Cancel".
14    button2.Text = "Cancel";
15    // Set the position of the button based on the location of button1.
16    button2.Location 
17       = new Point (button1.Left, button1.Height + button1.Top + 10);
18    // Make button1's dialog result OK.
19    button1.DialogResult = DialogResult.OK;
20    // Make button2's dialog result Cancel.
21    button2.DialogResult = DialogResult.Cancel;
22    // Set the caption bar text of the form.   
23    form1.Text = "My Dialog Box";
24 
25    // Define the border style of the form to a dialog box.
26    form1.FormBorderStyle = FormBorderStyle.FixedDialog;
27    // Set the accept button of the form to button1.
28    form1.AcceptButton = button1;
29    // Set the cancel button of the form to button2.
30    form1.CancelButton = button2;
31    // Set the start position of the form to the center of the screen.
32    form1.StartPosition = FormStartPosition.CenterScreen;
33    
34    // Add button1 to the form.
35    form1.Controls.Add(button1);
36    // Add button2 to the form.
37    form1.Controls.Add(button2);
38    
39    // Display the form as a modal dialog box.
40    form1.ShowDialog();
41 
42    // Determine if the OK button was clicked on the dialog box.
43    if (form1.DialogResult == DialogResult.OK)
44    ...{
45       // Display a message box indicating that the OK button was clicked.
46       MessageBox.Show("The OK button on the form was clicked.");
47       // Optional: Call the Dispose method when you are finished with the dialog box.
48       form1.Dispose();
49    }
50    else
51    ...{
52       // Display a message box indicating that the Cancel button was clicked.
53       MessageBox.Show("The Cancel button on the form was clicked.");
54       // Optional: Call the Dispose method when you are finished with the dialog box.
55       form1.Dispose();
56    }
57 }


 1[Visual Basic] 
2Public Sub CreateMyForm()Sub CreateMyForm()
3    ' Create a new instance of the form.
4    Dim form1 As New Form()
5    ' Create two buttons to use as the accept and cancel buttons.
6    Dim button1 As New Button()
7    Dim button2 As New Button()
8    
9    ' Set the text of button1 to "OK".
10    button1.Text = "OK"
11    ' Set the position of the button on the form.
12    button1.Location = New Point(10, 10)
13    ' Set the text of button2 to "Cancel".
14    button2.Text = "Cancel"
15    ' Set the position of the button based on the location of button1.
16    button2.Location = New Point(button1.Left, button1.Height + button1.Top + 10)
17    ' Make button1's dialog result OK.
18    button1.DialogResult = DialogResult.OK
19    ' Make button2's dialog result Cancel.
20    button2.DialogResult = DialogResult.Cancel
21    ' Set the caption bar text of the form.   
22    form1.Text = "My Dialog Box"
23    
24    ' Define the border style of the form to a dialog box.
25    form1.FormBorderStyle = FormBorderStyle.FixedDialog
26    ' Set the accept button of the form to button1.
27    form1.AcceptButton = button1
28    ' Set the cancel button of the form to button2.
29    form1.CancelButton = button2
30    ' Set the start position of the form to the center of the screen.
31    form1.StartPosition = FormStartPosition.CenterScreen
32    
33    ' Add button1 to the form.
34    form1.Controls.Add(button1)
35    ' Add button2 to the form.
36    form1.Controls.Add(button2)
37    
38    ' Display the form as a modal dialog box.
39    form1.ShowDialog()
40    
41    ' Determine if the OK button was clicked on the dialog box.
42    If form1.DialogResult = DialogResult.OK Then
43        ' Display a message box indicating that the OK button was clicked.
44        MessageBox.Show("The OK button on the form was clicked.")
45        ' Optional: Call the Dispose method when you are finished with the dialog box.
46        form1.Dispose
47    ' Display a message box indicating that the Cancel button was clicked.
48    Else
49        MessageBox.Show("The Cancel button on the form was clicked.")
50        ' Optional: Call the Dispose method when you are finished with the dialog box.
51        form1.Dispose
52    End If
53End Sub 'CreateMyForm


 


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ListView.Activation屬性 

Activation 屬性允許您指定用戶激活 ListView 控件中的項的方式。激活 ListView 中的項與只選擇項是不同的。當激活某個項時，通常會在 ItemActivate 事件的事件處理程序中執行一個操作。例如，當激活某個項時，您可能會打開一個文件或顯示一個允許用戶對項進行編輯的對話框。通常，項的激活是通過用戶對它進行雙擊來實現的。如果 Activation 屬性設置為 ItemActivation.OneClick，那么單擊該項一次即可將其激活。將 Activation 屬性設置為 ItemActivation.TwoClick 與標準的雙擊不同，這是因為兩次單擊之間的時間間隔可以是任意的。

注意   如果將 Activation 屬性設置為 ItemActivation.OneClick 或 ItemActivation.TwoClick，則不管 LabelEdit 屬性的值是什么，都不允許進行標簽編輯。