ListView.ColumnWidthChanging Händelse

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

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 

Händelsetyp

Exempel

I följande kodexempel visas hur du ColumnWidthChanging hanterar händelsen. Det visar ColumnWidthChangingEventArgs.NewWidth också medlemmarna och Cancel . Om du vill köra det här exemplet klistrar du in koden i ett Windows formulär. Anropa InitializeListView1 från formulärets konstruktor eller Load händelsehanterare.

 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

Kommentarer

Med den här händelsen kan du kontrollera den nya kolumnbredden ColumnWidthChangingEventArgs.NewWidth med egenskapen och avbryta händelsen om du väljer genom att ange Cancel egenskapen till true.

Mer information om hur du hanterar händelser finns i Hantera och höja händelser.