ListView.ColumnWidthChanging 事件

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

在更改列的宽度时发生。

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 

事件类型

ColumnWidthChangingEventHandler

示例

下面的代码示例演示如何处理 ColumnWidthChanging 事件。 它还演示 了 ColumnWidthChangingEventArgs.NewWidth 和 Cancel 成员。 若要运行此示例，请将代码粘贴到 Windows 窗体中。 从窗体的构造函数或Load事件处理程序调用 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

注解

此事件允许使用 属性检查新列宽ColumnWidthChangingEventArgs.NewWidth，如果选择将 属性设置为 true，则取消事件Cancel。

有关处理事件的详细信息，请参阅 处理和引发事件。