Question

再次，这是我的情况。基本上，我想要清除行并每隔一定时间添加行。我最简单的代码如下：

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
            Dim wreturnCode1 As Integer = System.Threading.ThreadPool.QueueUserWorkItem(New System.Threading.WaitCallback(AddressOf RepeatAction), cancellation.Token)
    End Sub

    Private Sub RepeatAction(ByVal obj As Object)
        Dim token As System.Threading.CancellationToken = CType(obj, System.Threading.CancellationToken)
        FormTimer.Enabled = True
        AddHandler FormTimer.Elapsed, AddressOf AutoTaskRepo
   End Sub

   Private Async Sub AutoTaskRepo()

        FormTimer.Enabled = False
        DataGridView1.Rows.Clear()
        DataGridView1.Rows.Add()
        DataGridView1.Rows.Add()
        DataGridView1.Rows.Add()
        DataGridView1.Rows.Add()
        DataGridView1.Rows.Add()
        DataGridView1.Rows.Add()
        FormTimer.Enabled = True

   End Sub

在datagridview中我有5列。当我添加行时，等待n秒并清除行并再次添加行。

Here is the table in the first iteration

下一次迭代工作正常，但在清除行后的某个时刻，系统会抛出NullReferenceException。

请注意，我不需要数据源和数据表。我想手动添加并手动清除datagridview中的数据。 SomeHelp

DataGridView.Rows.Clear：System.Windows.Forms.dll

0 个答案: