ListView.AfterLabelEdit ListView.AfterLabelEdit ListView.AfterLabelEdit ListView.AfterLabelEdit Event

定義

項目のラベルがユーザーによって編集されると発生します。Occurs when the label for an item is edited by the user.

public:
 event System::Windows::Forms::LabelEditEventHandler ^ AfterLabelEdit;
public event System.Windows.Forms.LabelEditEventHandler AfterLabelEdit;
member this.AfterLabelEdit : System.Windows.Forms.LabelEditEventHandler 
Public Custom Event AfterLabelEdit As LabelEditEventHandler 

次のコード例は、使用する方法を示します、AfterLabelEdit新しく編集されたラベルをアルファベットの文字に制限するイベントです。The following code example demonstrates how to use the AfterLabelEdit event to restrict a newly edited label to characters in the alphabet. この例では、ASCIIEncodingクラスの新しいラベルの各文字の ASCII 文字コードを取得します。The example uses the ASCIIEncoding class to obtain the ASCII character code of each character of the new label. 文字が数字を表す ASCII コードの間にある場合は、項目に新しいラベルを適用できません。If the character falls between the ASCII codes that represent numbers, the new label cannot be applied to the item. この例では、作成済みである必要があります、ListViewフォームとそれに追加された項目へのコントロール。This example requires that you have created a ListView control on a form and added items to it. また、例では接続していることが必要です、AfterLabelEditイベントをコードの例で定義されているイベント ハンドラー。The example also requires that you have connected the AfterLabelEdit event to the event handler defined in the example code. 使用するには、 ASCIIEncoding 、ファイルに含める必要があります、クラス、System.Text名前空間。In order to use the ASCIIEncoding class, your file must include the System.Text namespace.

private:
   void MyListView_AfterLabelEdit( Object^ /*sender*/, System::Windows::Forms::LabelEditEventArgs^ e )
   {
      // Determine if label is changed by checking for 0.
      if ( e->Label == nullptr )
               return;

      // ASCIIEncoding is used to determine if a number character has been entered.
      ASCIIEncoding^ AE = gcnew ASCIIEncoding;

      // Convert the new label to a character array.
      array<Char>^temp = e->Label->ToCharArray();

      // Check each character in the new label to determine if it is a number.
      for ( int x = 0; x < temp->Length; x++ )
      {
         // Encode the character from the character array to its ASCII code.
         array<Byte>^bc = AE->GetBytes( temp[ x ].ToString() );

         // Determine if the ASCII code is within the valid range of numerical values.
         if ( bc[ 0 ] > 47 && bc[ 0 ] < 58 )
         {
            // Cancel the event and return the lable to its original state.
            e->CancelEdit = true;

            // Display a MessageBox alerting the user that numbers are not allowed.
            MessageBox::Show( "The text for the item cannot contain numerical values." );

            // Break out of the loop and exit.
            return;
         }
      }
   }
private void MyListView_AfterLabelEdit(object sender, System.Windows.Forms.LabelEditEventArgs e)
{
 
   // Determine if label is changed by checking for null.
   if (e.Label == null)
      return;

   // ASCIIEncoding is used to determine if a number character has been entered.
   ASCIIEncoding AE = new ASCIIEncoding();
   // Convert the new label to a character array.
   char[] temp = e.Label.ToCharArray();

   // Check each character in the new label to determine if it is a number.
   for(int x=0; x < temp.Length; x++)
   {
      // Encode the character from the character array to its ASCII code.
      byte[] bc = AE.GetBytes(temp[x].ToString());
   
      // Determine if the ASCII code is within the valid range of numerical values.
      if(bc[0] > 47 && bc[0] < 58)
      {
         // Cancel the event and return the lable to its original state.
         e.CancelEdit = true;
         // Display a MessageBox alerting the user that numbers are not allowed.
         MessageBox.Show ("The text for the item cannot contain numerical values.");
         // Break out of the loop and exit.
         return;
      }
   }
}
Private Sub MyListView_AfterLabelEdit(ByVal sender As Object, ByVal e As System.Windows.Forms.LabelEditEventArgs) Handles listView1.AfterLabelEdit

   ' Determine if label is changed by checking to see if it is equal to Nothing.
   If e.Label Is Nothing Then
      Return
   End If
   ' ASCIIEncoding is used to determine if a number character has been entered.
   Dim AE As New ASCIIEncoding()
   ' Convert the new label to a character array.
   Dim temp As Char() = e.Label.ToCharArray()

   ' Check each character in the new label to determine if it is a number.
   Dim x As Integer
   For x = 0 To temp.Length - 1
      ' Encode the character from the character array to its ASCII code.
      Dim bc As Byte() = AE.GetBytes(temp(x).ToString())

      ' Determine if the ASCII code is within the valid range of numerical values.
      If bc(0) > 47 And bc(0) < 58 Then
         ' Cancel the event and return the lable to its original state.
         e.CancelEdit = True
         ' Display a MessageBox alerting the user that numbers are not allowed.
         MessageBox.Show("The text for the item cannot contain numerical values.")
         ' Break out of the loop and exit.
         Return
      End If
   Next x
End Sub

注釈

AfterLabelEditイベントは、ユーザーは、項目のテキストの変更が完了すると発生します。The AfterLabelEdit event occurs when the user finishes modifying the text for an item. 新しい項目のユーザーが入力文字列がイベントに渡され、イベント ハンドラーは、変更を拒否できます。The new string that the user types for the item is passed to the event, and the event handler can reject the change. イベント ハンドラーは、変更を拒否する場合、ユーザーがアイテムの編集を開始する前に、テキストをテキスト元に戻します。If the event handler rejects the change, the text reverts to the text as it was before the user began editing the item.

注意

ListView.AfterLabelEditイベントはラベルの編集がコミットされを呼び出す前に実行、ListView.Sortこのイベントのハンドラー メソッドは、元の値を使用して項目を並べ替えられます。Because the ListView.AfterLabelEdit event takes place before the label edit is committed, calling the ListView.Sort method in a handler for this event will sort the item using the original value.

ために、AfterLabelEditイベントを発生させる、LabelEditのプロパティ、ListViewにコントロールを設定する必要がありますtrueします。In order for the AfterLabelEdit event to be raised, the LabelEdit property of the ListView control must be set to true.

イベント ハンドラーを作成することができます、BeforeLabelEditユーザー項目のテキストを編集する前に、タスクを実行するイベントです。You can create an event handler for the BeforeLabelEdit event to perform tasks before the user edits the text of an item.

イベントの処理の詳細については、「処理とイベントの発生」を参照してください。For more information about handling events, see Handling and Raising Events.

適用対象

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