DataGridViewDataErrorEventArgs.ThrowException 属性

定义

获取或设置值,该值指示是否在 DataGridViewDataErrorEventHandler 委托处理完异常后引发该异常。Gets or sets a value indicating whether to throw the exception after the DataGridViewDataErrorEventHandler delegate is finished with it.

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

属性值

如果应引发异常,则为 true,否则为 falsetrue if the exception should be thrown; otherwise, false. 默认值为 falseThe default is false.

例外

将此属性设置为 true 时,Exception 属性值为 nullWhen setting this property to true, the Exception property value is null.

示例

下面的代码示例演示如何使用 ThrowException 属性指示不应引发异常。The following code example demonstrates using the ThrowException property to indicate that the exception should not be thrown. 此示例是 DataGridViewComboBoxColumn 类概述主题中提供的一个更大示例的一部分。This example is part of a larger example available in the DataGridViewComboBoxColumn class overview topic.

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

注解

如果 DataGridViewDataErrorEventHandler 处理了 Exception 属性所表示的异常,则将此属性设置为 false,并且你不希望将异常传播到可能处理 DataError 事件的另一个 DataGridViewDataErrorEventHandlerSet this property to false if the DataGridViewDataErrorEventHandler has dealt with the exception represented by the Exception property, and you do not want to propagate the exception to another DataGridViewDataErrorEventHandler that may handle the DataError event.

出于调试目的,传播异常并检查堆栈跟踪以获取有关错误上下文的信息,这可能很有用。For debugging purposes, it can be useful to propagate the exception and inspect the stack trace for information regarding the context of the error.

适用于

另请参阅