DataGridView.RowValidating DataGridView.RowValidating DataGridView.RowValidating DataGridView.RowValidating Event

정의

행의 유효성을 검사하는 도중에 발생합니다.Occurs when a row is validating.

public:
 event System::Windows::Forms::DataGridViewCellCancelEventHandler ^ RowValidating;
public event System.Windows.Forms.DataGridViewCellCancelEventHandler RowValidating;
member this.RowValidating : System.Windows.Forms.DataGridViewCellCancelEventHandler 
Public Custom Event RowValidating As DataGridViewCellCancelEventHandler 

예제

다음 코드 예제에서는 RowValidating 올바른 추적 및 릴리스 날짜를 입력 하는 경우를 확인 합니다.The following code example uses RowValidating to check if valid track and release dates are entered.

private void ValidateByRow(Object sender, 
    DataGridViewCellCancelEventArgs data) 
{
    DataGridViewRow row = 
        songsDataGridView.Rows[data.RowIndex];
    DataGridViewCell trackCell = 
        row.Cells[songsDataGridView.Columns["Track"].Index];
    DataGridViewCell dateCell = 
        row.Cells[songsDataGridView.Columns["Release Date"].Index];
    data.Cancel = !(IsTrackGood(trackCell) && IsDateGood(dateCell));
}

private Boolean IsTrackGood(DataGridViewCell cell)
{
    Int32 cellValueAsInt;
    if (cell.Value.ToString().Length == 0)
    {
        cell.ErrorText = "Please enter a track";
        songsDataGridView.Rows[cell.RowIndex].ErrorText = 
            "Please enter a track";
        return false;
    }
    else if (cell.Value.ToString().Equals("0"))
    {
        cell.ErrorText = "Zero is not a valid track";
        songsDataGridView.Rows[cell.RowIndex].ErrorText =
            "Zero is not a valid track";
        return false;
    }
    else if (!Int32.TryParse(cell.Value.ToString(), out cellValueAsInt))
    {
        cell.ErrorText = "A Track must be a number";
        songsDataGridView.Rows[cell.RowIndex].ErrorText =
            "A Track must be a number";
        return false;
    }
    return true;
}

private Boolean IsDateGood(DataGridViewCell cell) 
{
    if (cell.Value == null)
    {
        cell.ErrorText = "Missing date";
        songsDataGridView.Rows[cell.RowIndex].ErrorText = 
            "Missing date";
        return false;
    }
    else
    {
        try
        {
            DateTime.Parse(cell.Value.ToString());
        }
        catch (FormatException)
        {
            cell.ErrorText = "Invalid format";
            songsDataGridView.Rows[cell.RowIndex].ErrorText = 
                "Invalid format";

            return false;
        }
    }
    return true;
}
Private Sub ValidateByRow(ByVal sender As Object, _
    ByVal data As DataGridViewCellCancelEventArgs) _
    Handles songsDataGridView.RowValidating

    Dim row As DataGridViewRow = _
        songsDataGridView.Rows(data.RowIndex)
    Dim trackCell As DataGridViewCell = _
        row.Cells(songsDataGridView.Columns("Track").Index)
    Dim dateCell As DataGridViewCell = _
        row.Cells(songsDataGridView.Columns("Release Date").Index)
    data.Cancel = Not (IsTrackGood(trackCell) _
        AndAlso IsDateGood(dateCell))
End Sub

Private Function IsTrackGood(ByRef cell As DataGridViewCell) As Boolean

    If cell.Value.ToString().Length = 0 Then
        cell.ErrorText = "Please enter a track"
        songsDataGridView.Rows(cell.RowIndex).ErrorText = _
            "Please enter a track"
        Return False
    ElseIf cell.Value.ToString().Equals("0") Then
        cell.ErrorText = "Zero is not a valid track"
        songsDataGridView.Rows(cell.RowIndex).ErrorText = _
            "Zero is not a valid track"
        Return False
    ElseIf Not Integer.TryParse( _
        cell.Value.ToString(), New Integer()) Then
        cell.ErrorText = "A Track must be a number"
        songsDataGridView.Rows(cell.RowIndex).ErrorText = _
            "A Track must be a number"
        Return False
    End If
    Return True
End Function

Private Function IsDateGood(ByRef cell As DataGridViewCell) As Boolean

    If cell.Value Is Nothing Then
        cell.ErrorText = "Missing date"
        songsDataGridView.Rows(cell.RowIndex).ErrorText = _
            "Missing date"
        Return False
    Else
        Try
            DateTime.Parse(cell.Value.ToString())
        Catch ex As FormatException

            cell.ErrorText = "Invalid format"
            songsDataGridView.Rows(cell.RowIndex).ErrorText = _
                "Invalid format"

            Return False
        End Try
    End If
    Return True
End Function

설명

이 이벤트는 비슷합니다는 Control.Validating 이벤트입니다.This event is analogous to the Control.Validating event. 이 이벤트를 사용 하 여 행의 모든 값에 대해 유효성 검사를 수행 합니다.Use this event to perform validation on all the values of a row. 행 유효성 검사를 통과 하지 못하는 경우 설정 합니다 CancelEventArgs.Cancel 속성을 true입니다.If the row does not pass validation, set the CancelEventArgs.Cancel property to true. 방지이 이벤트를 취소 합니다 RowValidated, Control.Validating, 및 Control.Validated 이벤트 발생을 사용자에서 잘못 된 행 나갈 수 없도록 방지 및 행을 데이터 바인딩된 모드에서 외부 데이터 원본에 저장 되지 않도록 방지 합니다.Canceling this event prevents the RowValidated, Control.Validating, and Control.Validated events from occurring, and also prevents the user from leaving the invalid row and prevents the row from being saved to an external data source in data bound mode.

이벤트를 처리 하는 방법에 대 한 자세한 내용은 참조 하세요. 이벤트 처리 및 발생합니다.For more information about how to handle events, see Handling and Raising Events.

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