DataGridViewDataErrorEventArgs.Context 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

取得發生錯誤時，DataGridView 之狀態的詳細資料。

public:
 property System::Windows::Forms::DataGridViewDataErrorContexts Context { System::Windows::Forms::DataGridViewDataErrorContexts get(); };

public System.Windows.Forms.DataGridViewDataErrorContexts Context { get; }

member this.Context : System.Windows.Forms.DataGridViewDataErrorContexts

Public ReadOnly Property Context As DataGridViewDataErrorContexts

屬性值

DataGridViewDataErrorContexts

DataGridViewDataErrorContexts 值的位元組合，指定發生錯誤的內容。

範例

下列程式碼範例示範如何調查錯誤內容。 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

列舉的成員 DataGridViewDataErrorContexts 可以使用位 OR 運算子結合，以表示發生資料錯誤時所系結 DataGridView 資料的狀態。 例如，如果使用者輸入不正確儲存格值 (例如在需要日期) 的儲存格中輸入名稱，然後選取不同的儲存格，則會 DataGridView 嘗試認可不正確儲存格值。 當認可失敗時， DataGridView 將會引發 DataError 事件，其 Context 屬性將具有 和 CurrentCellChange 的值 Commit 。

另請參閱

• DataGridView
• DataError