如何将datagridview列值与文本框值相乘。 [英] How do I multiply datagridview column values with a text box value.

问题描述

如果我生成一些行然后我输入文本框值.............，但是首先如果我输入文本框值然后生成行，则代码工作正常。它不执行操作，总值显示在totPenTxt.Text为零。



我尝试过：

The Code is working fine if i generate some rows and then i input Text box Value ............. but first if i input Text box value and then generate rows. It do not perform action and the total value shows in totPenTxt.Text zero.

What I have tried:

private void penTxt_TextChanged(object sender, EventArgs e)
       {
           int sum = 0;
           for (int i = 0; i < metroGrid1.Rows.Count - 1; ++i)
           {
               sum += Convert.ToInt32(metroGrid1.Rows[i].Cells["quantity"].Value);
           }
           if (penTxt.Text == string.Empty && totPenTxt.Text != string.Empty)
           {
               totPenTxt.Text = Convert.ToInt32(0).ToString();
           }
           else
           {
               int value = Convert.ToInt32(penTxt.Text);

                   int result = value * sum;
                   totPenTxt.Text = result.ToString();

           }

推荐答案

如果GridView中没有行，则sum将为零。你需要添加一个正确的行数检查，如果没有，则采取不同的行动。



另外......

If there are no rows in the GridView then sum will be zero. You need to add a proper check for the number of rows and take a different action if there are none.

Also ...

        totPenTxt.Text = Convert.ToInt32(0).ToString();
// why not just:
        totPenTxt.Text = "0";

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