ListView.ColumnWidthChanging 事件

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

來源:

ListView.cs

當一列的寬度改變時，會發生這種情況。

public:
 event System::Windows::Forms::ColumnWidthChangingEventHandler ^ ColumnWidthChanging;

public event System.Windows.Forms.ColumnWidthChangingEventHandler? ColumnWidthChanging;

member this.ColumnWidthChanging : System.Windows.Forms.ColumnWidthChangingEventHandler 

Public Custom Event ColumnWidthChanging As ColumnWidthChangingEventHandler 

事件類型

ColumnWidthChangingEventHandler

範例

以下程式碼範例示範如何處理該 ColumnWidthChanging 事件。 它同時展示了 ColumnWidthChangingEventArgs.NewWidth 成員 Cancel 。 要執行這個範例，請將程式碼貼到 Windows 表單中。 從表單的建構子或Load事件處理器呼叫InitializeListView1。

 ListView listView1 = new ListView();
 private void InitializeListView1()
 {
     // Initialize a ListView in detail view and add some columns.
     listView1.View = View.Details;
     listView1.Width = 200;
     listView1.Columns.Add("Column1");
     listView1.Columns.Add("Column2");

     // Associate a method with the ColumnWidthChangingEvent.
     listView1.ColumnWidthChanging += 
         new ColumnWidthChangingEventHandler(listView1_ColumnWidthChanging);
     this.Controls.Add(listView1);
 }

 // Handle the ColumnWidthChangingEvent.
 private void listView1_ColumnWidthChanging(object sender,  
     ColumnWidthChangingEventArgs e)
 {
     // Check if the new width is too big or too small.
     if (e.NewWidth > 100 || e.NewWidth < 5)
     {
         // Cancel the event and inform the user if the new
         // width does not meet the criteria.
         MessageBox.Show("Column width is too large or too small");
         e.Cancel = true;
     }
 }

Private WithEvents listView1 As New ListView()

Private Sub InitializeListView1()

    ' Initialize a ListView in detail view and add some columns.
    listView1.View = View.Details
    listView1.Width = 200
    listView1.Columns.Add("Column1")
    listView1.Columns.Add("Column2")
    Me.Controls.Add(listView1)

End Sub


' Handle the ColumnWidthChangingEvent.
Private Sub listView1_ColumnWidthChanging(ByVal sender As Object, _
    ByVal e As ColumnWidthChangingEventArgs) _
    Handles listView1.ColumnWidthChanging

    ' Check if the new width is too big or too small.
    If e.NewWidth > 100 OrElse e.NewWidth < 5 Then

        ' Cancel the event and inform the user if the new
        ' width does not meet the criteria.
        MessageBox.Show("Column width is too large or too small")
        e.Cancel = True
    End If

End Sub

備註

此事件允許你檢查屬性ColumnWidthChangingEventArgs.NewWidth的新欄寬度，若選擇，則可將該屬性Cancel設true為 取消事件。

如需處理事件的詳細資訊，請參閱 處理和引發事件。