DataGridView.CellValidating 事件

  • 参考

定义

命名空间:
System.Windows.Forms
程序集:
System.Windows.Forms.dll

在单元格失去输入焦点时发生，并启用内容验证功能。

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

事件类型

DataGridViewCellValidatingEventHandler

示例

下面的代码示例处理 CellValidating 事件，以确保用户只输入正整数。 此示例是参考主题中提供的更大示例的 VirtualMode 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

注解

取消此事件将取消对当前单元格所做的更改。 在数据绑定模式下取消此事件时，不会将新值推送到基础数据源。 在虚拟模式下取消此事件时，不会引发该 CellValuePushed 事件。

CellValidated处理 事件以执行验证后处理。

有关如何处理事件的详细信息，请参阅 处理和引发事件。

适用于

另请参阅