c# - 单元格焦点上的 CellValidating 错误

Question

我的表单中有 2 个 Datagridview，我在我的 datagridview 中使用单元格验证和单元格验证事件处理程序。如果我将光标留在单元格本身并尝试通过菜单单击打开一个新文件..我收到一条错误消息:“用户代码未处理异常参数，索引超出范围。”

我知道，当光标位于单元格中时，它获得了焦点并且它正在进行单元格验证，这就是我收到此错误的原因。

此行抛出错误消息:“用户代码未处理异常参数，索引超出范围。”datagridview.Rows[e.RowIndex].ErrorText = "";

我怎样才能避免这个错误？？或者如何在单击菜单打开新文件时删除焦点？谢谢。

private void datagridview_CellValidating(object sender, CellValidatingEventArgs e)
            {
                if (e.ColumnInfo.Name == "Item1" || e.ColumnInfo.Name == "Item2")
                {
                    datagridview.Rows[e.RowIndex].ErrorText = "";
                    int newInteger;
                    if (datagridview.Rows[e.RowIndex].IsModified)
                        return;
                    if (!int.TryParse(e.Value.ToString(),
                         out newInteger) || newInteger < -50000 || newInteger > 50000)
                    {
                        e.Cancel = true;
                        datagridview.Rows[e.RowIndex].ErrorText = "The value must be a non-negative integer";
                    }
                }

            }

 private void datagridview_CellValidated(object sender, CellValidatedEventArgs e)
            {

                if (e.ColumnIndex != 3)
                    return;
                int nextRowIndex = e.RowIndex + 1;
                int lastRowIndex = datagridview.Rows.Count - 1;
                if (nextRowIndex <= lastRowIndex)
                {
                    var value = datagridview.Rows[e.RowIndex].Cells[3].Value.ToString();
                    datagridview.Rows[nextRowIndex].Cells[2].Value = value;
                }
            }

MenuItem 单击以将新文件打开到 Datagridview:

private void m_test1_Click_1(object sender, EventArgs e)
    {
        myconfig = Myconfig.DeserializeFromXmlFile(@"test2.xml");
        Display(rseConfig);
        m_ConfigPages.Visible = true;

    }



private void m_test2_Click(object sender, EventArgs e)
  {
        myconfig = Myconfig.DeserializeFromXmlFile(@"test2.xml");
        Display(myconfig );
        m_ConfigPages.Visible = true;

    }

我正在使用 DataError Event Hnadler，但它不起作用:

private void datagridview_DataError(object sender, DataGridViewDataErrorEventArgs e)
        {
            // Don't throw an exception when we're done.
            e.ThrowException = false;

            // Display an error message.
            string txt = "Error with " +
                datagridview.Columns[e.ColumnIndex].HeaderText +
                "\n\n" + e.Exception.Message;
            MessageBox.Show(txt, "Error",
                MessageBoxButtons.OK, MessageBoxIcon.Error);

            // If this is true, then the user is trapped in this cell.
            e.Cancel = true;
        }

甚至，我有行和列索引:datagridview.Rows[e.RowIndex].Cells[e.ColumnIndex].Value 仍然无法正常工作。

Answer 1

尝试添加这个事件

dgv.DataError += new DataGridViewDataErrorEventHandler(dgv_DataError);


void dgv_DataError(object sender, DataGridViewDataErrorEventArgs e)
{
      //Show any message or not.. its upto you now 
}

编辑:

将您的 cellvalidating 事件修改为

private void datagridview_CellValidating(object sender, CellValidatingEventArgs e)
{
  try
  {
     int temp = Convert.ToInt32(e.Value.ToString())
     if(temp < -5000 || temp > 5000)     
          datagridview.Rows[e.RowIndex].ErrorText = "The value must be bteewn 5000 and 5000";
  }
  catch
  {
     datagridview.Rows[e.RowIndex].ErrorText = "The value must be integer and bteewn 5000 and 5000";
  }
}