DataGridView.DataError 事件

定義

發生於外部資料剖析或驗證作業擲回例外狀況時,或是嘗試讓資料來源認可資料,但卻失敗時。

public:
 event System::Windows::Forms::DataGridViewDataErrorEventHandler ^ DataError;
public event System.Windows.Forms.DataGridViewDataErrorEventHandler DataError;
public event System.Windows.Forms.DataGridViewDataErrorEventHandler? DataError;
member this.DataError : System.Windows.Forms.DataGridViewDataErrorEventHandler 
Public Custom Event DataError As DataGridViewDataErrorEventHandler 

事件類型

範例

下列程式碼範例示範 DataError 事件處理常式。 此範例是類別概觀主題中較大範例的 DataGridViewComboBoxColumn 一部分。

private:
    void DataGridView1_DataError(Object^ sender, DataGridViewDataErrorEventArgs^ anError)
    {

        MessageBox::Show("Error happened " + anError->Context.ToString());

        if (anError->Context == DataGridViewDataErrorContexts::Commit)
        {
            MessageBox::Show("Commit error");
        }
        if (anError->Context == DataGridViewDataErrorContexts::CurrentCellChange)
        {
            MessageBox::Show("Cell change");
        }
        if (anError->Context == DataGridViewDataErrorContexts::Parsing)
        {
            MessageBox::Show("parsing error");
        }
        if (anError->Context == DataGridViewDataErrorContexts::LeaveControl)
        {
            MessageBox::Show("leave control error");
        }

        if (dynamic_cast<ConstraintException^>(anError->Exception) != nullptr)
        {
            DataGridView^ view = (DataGridView^)sender;
            view->Rows[anError->RowIndex]->ErrorText = "an error";
            view->Rows[anError->RowIndex]->Cells[anError->ColumnIndex]->ErrorText = "an error";

            anError->ThrowException = false;
        }
    }
private void DataGridView1_DataError(object sender, DataGridViewDataErrorEventArgs anError)
{

    MessageBox.Show("Error happened " + anError.Context.ToString());

    if (anError.Context == DataGridViewDataErrorContexts.Commit)
    {
        MessageBox.Show("Commit error");
    }
    if (anError.Context == DataGridViewDataErrorContexts.CurrentCellChange)
    {
        MessageBox.Show("Cell change");
    }
    if (anError.Context == DataGridViewDataErrorContexts.Parsing)
    {
        MessageBox.Show("parsing error");
    }
    if (anError.Context == DataGridViewDataErrorContexts.LeaveControl)
    {
        MessageBox.Show("leave control error");
    }

    if ((anError.Exception) is ConstraintException)
    {
        DataGridView view = (DataGridView)sender;
        view.Rows[anError.RowIndex].ErrorText = "an error";
        view.Rows[anError.RowIndex].Cells[anError.ColumnIndex].ErrorText = "an error";

        anError.ThrowException = false;
    }
}
Private Sub DataGridView1_DataError(ByVal sender As Object, _
ByVal e As DataGridViewDataErrorEventArgs) _
Handles DataGridView1.DataError

    MessageBox.Show("Error happened " _
        & e.Context.ToString())

    If (e.Context = DataGridViewDataErrorContexts.Commit) _
        Then
        MessageBox.Show("Commit error")
    End If
    If (e.Context = DataGridViewDataErrorContexts _
        .CurrentCellChange) Then
        MessageBox.Show("Cell change")
    End If
    If (e.Context = DataGridViewDataErrorContexts.Parsing) _
        Then
        MessageBox.Show("parsing error")
    End If
    If (e.Context = _
        DataGridViewDataErrorContexts.LeaveControl) Then
        MessageBox.Show("leave control error")
    End If

    If (TypeOf (e.Exception) Is ConstraintException) Then
        Dim view As DataGridView = CType(sender, DataGridView)
        view.Rows(e.RowIndex).ErrorText = "an error"
        view.Rows(e.RowIndex).Cells(e.ColumnIndex) _
            .ErrorText = "an error"

        e.ThrowException = False
    End If
End Sub

備註

事件 DataError 可讓您處理在資料處理作業期間由 控制項呼叫的程式碼中擲回的例外狀況。

如需如何處理事件的詳細資訊,請參閱 處理和引發事件

注意

ColumnIndex與此事件相關聯的 物件和 RowIndex 屬性 DataGridViewDataErrorEventArgs 通常表示發生資料錯誤的儲存格。 不過,當錯誤發生在外部資料源時,資料來源可能不會提供發生錯誤的資料行。 在此情況下, ColumnIndex 屬性通常會在錯誤時指出目前儲存格的資料行。

適用於

另請參閱