Control.Validated イベント
定義
コントロールの検証が終了すると発生します。Occurs when the control is finished validating.
public:
event EventHandler ^ Validated;public event EventHandler Validated;member this.Validated : EventHandler Public Custom Event Validated As EventHandler 例
次のコード例では、派生クラス TextBox を使用して、ユーザーが入力する電子メールアドレスを検証します。The following code example uses the derived class TextBox and validates an email address that the user enters. 電子メールアドレスが標準形式 ("@" and "") に含まれていない場合、検証は失敗し、ErrorProvider アイコンが表示され、イベントは取り消されます。If the email address is not in the standard format (containing "@" and "."), the validation fails, an ErrorProvider icon is displayed, and the event is canceled. この例では、TextBox および ErrorProvider コントロールがフォーム上に作成されている必要があります。This example requires that a TextBox and ErrorProvider control have been created on a form.
private:
void textBox1_Validating( Object^ sender, System::ComponentModel::CancelEventArgs^ e )
{
String^ errorMsg;
if ( !ValidEmailAddress( textBox1->Text, &errorMsg ) )
{
// Cancel the event and select the text to be corrected by the user.
e->Cancel = true;
textBox1->Select( 0, textBox1->Text->Length );
// Set the ErrorProvider error with the text to display.
this->errorProvider1->SetError( textBox1, errorMsg );
}
}
void textBox1_Validated( Object^ sender, System::EventArgs^ e )
{
// If all conditions have been met, clear the ErrorProvider of errors.
errorProvider1->SetError( textBox1, "" );
}
public:
bool ValidEmailAddress( String^ emailAddress, [Out]interior_ptr<String^> errorMessage )
{
// Confirm that the email address String* is not empty.
if ( emailAddress->Length == 0 )
{
*errorMessage = "email address is required.";
return false;
}
// Confirm that there is an "@" and a "." in the email address, and in the correct order.
if ( emailAddress->IndexOf( "@" ) > -1 )
{
if ( emailAddress->IndexOf( ".", emailAddress->IndexOf( "@" ) ) > emailAddress->IndexOf( "@" ) )
{
*errorMessage = "";
return true;
}
}
*errorMessage = "email address must be valid email address format.\n" +
"For example 'someone@example.com' ";
return false;
}
private void textBox1_Validating(object sender,
System.ComponentModel.CancelEventArgs e)
{
string errorMsg;
if(!ValidEmailAddress(textBox1.Text, out errorMsg))
{
// Cancel the event and select the text to be corrected by the user.
e.Cancel = true;
textBox1.Select(0, textBox1.Text.Length);
// Set the ErrorProvider error with the text to display.
this.errorProvider1.SetError(textBox1, errorMsg);
}
}
private void textBox1_Validated(object sender, System.EventArgs e)
{
// If all conditions have been met, clear the ErrorProvider of errors.
errorProvider1.SetError(textBox1, "");
}
public bool ValidEmailAddress(string emailAddress, out string errorMessage)
{
// Confirm that the email address string is not empty.
if(emailAddress.Length == 0)
{
errorMessage = "email address is required.";
return false;
}
// Confirm that there is an "@" and a "." in the email address, and in the correct order.
if(emailAddress.IndexOf("@") > -1)
{
if(emailAddress.IndexOf(".", emailAddress.IndexOf("@") ) > emailAddress.IndexOf("@") )
{
errorMessage = "";
return true;
}
}
errorMessage = "email address must be valid email address format.\n" +
"For example 'someone@example.com' ";
return false;
}
Private Function ValidEmailAddress(ByVal emailAddress As String, ByRef errorMessage As String) As Boolean
' Confirm there is text in the control.
If textBox1.Text.Length = 0 Then
errorMessage = "Email address is required."
Return False
End If
' Confirm that there is an "@" and a "." in the email address, and in the correct order.
If emailAddress.IndexOf("@") > -1 Then
If (emailAddress.IndexOf(".", emailAddress.IndexOf("@")) > emailAddress.IndexOf("@")) Then
errorMessage = ""
Return True
End If
End If
errorMessage = "Email address must be valid email address format." + ControlChars.Cr + _
"For example 'someone@example.com' "
Return False
End Function
Private Sub textBox1_Validating(ByVal sender As Object, _
ByVal e As System.ComponentModel.CancelEventArgs) Handles textBox1.Validating
Dim errorMsg As String
If Not ValidEmailAddress(textBox1.Text, errorMsg) Then
' Cancel the event and select the text to be corrected by the user.
e.Cancel = True
textBox1.Select(0, textBox1.Text.Length)
' Set the ErrorProvider error with the text to display.
Me.errorProvider1.SetError(textBox1, errorMsg)
End If
End Sub
Private Sub textBox1_Validated(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles textBox1.Validated
' If all conditions have been met, clear the error provider of errors.
errorProvider1.SetError(textBox1, "")
End Sub
注釈
キーボード (タブ、SHIFT + TAB など) を使用してフォーカスを変更する場合、Select または SelectNextControl のメソッドを呼び出すか、ContainerControl.ActiveControl プロパティを現在のフォームに設定すると、フォーカスイベントは次の順序で発生します。When you change the focus by using the keyboard (TAB, SHIFT+TAB, and so on), by calling the Select or SelectNextControl methods, or by setting the ContainerControl.ActiveControl property to the current form, focus events occur in the following order:
マウスを使用するか Focus メソッドを呼び出すことによってフォーカスを変更すると、フォーカスイベントは次の順序で発生します。When you change the focus by using the mouse or by calling the Focus method, focus events occur in the following order:
CausesValidation プロパティが falseに設定されている場合、Validating および Validated イベントは抑制されます。If the CausesValidation property is set to false, the Validating and Validated events are suppressed.
CancelEventArgs の Cancel プロパティが Validating イベントデリゲートで true に設定されている場合、通常は、Validating イベントの後に発生するすべてのイベントが抑制されます。If the Cancel property of the CancelEventArgs is set to true in the Validating event delegate, all events that would usually occur after the Validating event are suppressed.
注意事項
Enter、GotFocus、Leave、LostFocus、Validating、または Validated のイベントハンドラー内からフォーカスを設定しないようにしてください。Do not attempt to set focus from within the Enter, GotFocus, Leave, LostFocus, Validating, or Validated event handlers. これにより、アプリケーションまたはオペレーティングシステムが応答を停止する可能性があります。Doing so can cause your application or the operating system to stop responding. 詳細については、「 WM_KILLFOCUS 」トピックと、「 About Messages and message Queues 」トピックの「message デッドロック」セクションを参照してください。For more information, see the WM_KILLFOCUS topic, and the "Message Deadlocks" section of the About Messages and Message Queues topic.
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.