Question

我在DataGridView1_CellValidating中遇到问题。每当我触发搜索按钮并将数据放在指定的行中时，它会弹出我的消息框三次。为什么我使用在datagridview中验证的单元格，因为我用它来将我的数据插入到数据库中，并且我想在每次搜索时也使用该datagridview来显示数据。当我触发搜索按钮时，是否可以暂时禁用datagridview_cellvalidating？然后再次启用，以便我可以再次使用它来输入用户的内容。这是我在DataGridView1_CellValidating中的代码：

 Private Sub DataGridView1_CellValidating(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellValidatingEventArgs) Handles DataGridView1.CellValidating

    If String.IsNullOrEmpty(e.FormattedValue) Then
        ' Show the user a message
        MessageBox.Show("You have left the cell empty")
        ' Fail validation (prevent them from leaving the cell)
        e.Cancel = False
    End If

这是我的搜索按钮

Dim conn As New MySqlConnection
        conn.ConnectionString = ("server=127.0.0.1;user id=root;password=12345;database=dbsis3bkenth;")
        Try
            conn.Open()

        sql = "SELECT LName,FName,MI FROM tblsisterbrother where IDNoBrodSis = '" & cbIDNo.Text & "'"
        cmd = New MySqlCommand(sql, conn)
        dr = cmd.ExecuteReader
        dr.Read()

        If dr.HasRows = True Then
            MessageBox.Show("Record Found.!")
        Else
            MessageBox.Show("Record Unfound.!")
        End If
        dr.Close()
    Catch ex As MySqlException
        MessageBox.Show("Error in searching to database:error is:" & ex.Message)
        Exit Sub
    End Try
    dr.Close()
    Dim DataAdapter1 As MySqlDataAdapter = New MySqlDataAdapter
    DataAdapter1.SelectCommand = cmd
    DataAdapter1.Fill(ds, "tblsisterbrother")
    DataGridView1.DataSource = ds
    DataGridView1.DataMember = "tblsisterbrother"
    conn.Dispose()
    conn.Close()

End Sub

请帮帮我并提出建议。谢谢:)）

Answer 1

您将删除订阅的活动，然后在完成工作后重新订阅

RemoveHandler DataGridView1.CellValidating, AddressOf DataGridView1_CellValidating
' do work
AddHandler DataGridView1.CellValidating, AddressOf DataGridView1_CellValidating

如何在从mysql查询数据时在vb.net中临时禁用Datagridview1_cellvalidating

1 个答案: