DataGridViewDataErrorEventArgs.ThrowException 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

取得或設定值，指出是否要在完成 DataGridViewDataErrorEventHandler 委派後擲出例外狀況。

public:
 property bool ThrowException { bool get(); void set(bool value); };

public bool ThrowException { get; set; }

member this.ThrowException : bool with get, set

Public Property ThrowException As Boolean

屬性值

Boolean

如果應該擲出例外狀況則為 true，否則為 false。 預設為 false。

例外狀況

ArgumentException

將這個屬性設為 true 時，Exception 屬性值為 null。

範例

下列程式碼範例示範如何使用 ThrowException 屬性來指出不應該擲回例外狀況。 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

如果 DataGridViewDataErrorEventHandler 已處理 屬性 false 所 Exception 表示的例外狀況，而且您不想將例外狀況傳播至另一個 DataGridViewDataErrorEventHandler 可能處理 DataError 事件的例外狀況，請將此屬性設定為 。

為了進行偵錯，傳播例外狀況並檢查堆疊追蹤是否有錯誤內容的相關資訊很有用。

另請參閱

• DataGridView
• DataError