DataGridViewCellValidatingEventHandler 代理人

定義

public delegate void DataGridViewCellValidatingEventHandler(System::Object ^ sender, DataGridViewCellValidatingEventArgs ^ e);

public delegate void DataGridViewCellValidatingEventHandler(object sender, DataGridViewCellValidatingEventArgs e);

type DataGridViewCellValidatingEventHandler = delegate of obj * DataGridViewCellValidatingEventArgs -> unit

Public Delegate Sub DataGridViewCellValidatingEventHandler(sender As Object, e As DataGridViewCellValidatingEventArgs)

參數

範例

以下程式碼範例處理 CellValidating 事件，確保使用者只輸入正整數。 此範例是參考主題中更大範例 VirtualMode 的一部分。

void VirtualConnector::dataGridView1_CellValidating
    (Object^ sender, DataGridViewCellValidatingEventArgs^ e)
{
    int newInteger;

    // Don't try to validate the 'new row' until finished 
    // editing since there
    // is not any point in validating its initial value.
    if (dataGridView1->Rows[e->RowIndex]->IsNewRow) 
    {
        return; 
    }
    if (!Int32::TryParse(e->FormattedValue->ToString(), 
        newInteger) || (newInteger < 0))
    {
        e->Cancel = true;
    }
}

private void dataGridView1_CellValidating(object sender,
    DataGridViewCellValidatingEventArgs e)
{
    dataGridView1.Rows[e.RowIndex].ErrorText = "";
    int newInteger;

    // Don't try to validate the 'new row' until finished 
    // editing since there
    // is not any point in validating its initial value.
    if (dataGridView1.Rows[e.RowIndex].IsNewRow) { return; }
    if (!int.TryParse(e.FormattedValue.ToString(),
        out newInteger) || newInteger < 0)
    {
        e.Cancel = true;
        dataGridView1.Rows[e.RowIndex].ErrorText = "the value must be a non-negative integer";
    }
}

Private Sub dataGridView1_CellValidating(ByVal sender As Object, _
    ByVal e _
    As DataGridViewCellValidatingEventArgs) _
    Handles dataGridView1.CellValidating

    Me.dataGridView1.Rows(e.RowIndex).ErrorText = ""
    Dim newInteger As Integer

    ' Don't try to validate the 'new row' until finished 
    ' editing since there
    ' is not any point in validating its initial value.
    If dataGridView1.Rows(e.RowIndex).IsNewRow Then Return
    If Not Integer.TryParse(e.FormattedValue.ToString(), newInteger) _
        OrElse newInteger < 0 Then

        e.Cancel = True
        Me.dataGridView1.Rows(e.RowIndex).ErrorText = "the value must be a non-negative integer"

    End If
End Sub

備註

CellValidating當儲存格失去輸入焦點時，會發生事件，從而實現內容驗證。 取消此事件會取消對當前儲存格的變更。 當此事件在資料綁定模式下被取消時，新的值不會推送到底層資料來源。 當此活動在虛擬模式中被取消時，活動 CellValuePushed 將不會被提出。

當你建立 DataGridViewCellValidatingEventHandler 代理人時，你就能確定處理事件的方法。 要將事件與你的事件處理器關聯，請將該代理的實例加入事件中。 事件處理程序會在事件發生時被呼叫，除非你移除代理。 欲了解更多關於事件處理代表的資訊，請參閱 「處理與提升事件」。

另請參閱

• DataGridView
• CellValidating
• CellValidated
• CellValuePushed
• DataGridViewCellValidatingEventArgs
• DataGridViewCell