datagridview列相乘，然后将它们相加

问题描述

你好，
我希望将两列的值一一乘以两，然后在文本框中打印这些相乘的答案的总和.我已经写了一个代码，但是它给出了超出范围的错误.代码是这样的:



d = 0

对于r = 0到a-1
c =(DataGridView1.Item(j + 3，r + 1).value * DataGridView1.Item(j + 2，r + 1).value)
d = d + c
下一个r
TextBox2.Text = Str(d)


这里"r"是行，"a"是用户给出的行总数."j"是列


请尽快尽快答复我.

hello,
i want two multiply two column''s value one by one and then print the sum of these multiplied answers in a text box. i have written a code but it gives out of range error.the code is this:



d = 0

For r = 0 To a - 1
c = (DataGridView1.Item(j + 3, r + 1).value * DataGridView1.Item(j + 2, r + 1).value)
d = d + c
Next r
TextBox2.Text = Str(d)


here "r" are rows and "a" is total no.of rows given by user."j" are columns


kindly reply me as soon as possible i need this urgently.

推荐答案

Double val1 = Convert.ToDouble(dataGridView1.Rows[e.RowIndex].Cells[4].Value);
                Double val2 = Convert.ToDouble(dataGridView1.Rows[e.RowIndex].Cells[6].Value);
                dataGridView1.Rows[e.RowIndex].Cells[7].Value = val1 * val2;
                //val3 = Convert.ToInt32(dataGridView1.Rows[e.RowIndex].Cells[8].Value);
                //tb_grossamt.Text = (val1 * val2).ToString();
                Double valgrd = (val1 * val2);
                Double valtax = Convert.ToDouble(tb_tax.Text);
                Double taxtot = (valgrd * valtax / 100);
                Double ftot = (valgrd + taxtot);

c = (DataGridView1.Item(j + 3, r + 1).value * DataGridView1.Item(j + 2, r + 1).value)

>
循环的upper bound value的r+1使Row index成为a，这会导致上述错误.

因此，在上面的代码中用r替换r+1，最好将值转换为Double 以便进行乘法运算，如Solution 1中已经建议的那样，如下所示:

r+1 for upper bound value of the loop makes Row index as a which causes the above error.

So replace r+1 with r in the above code further it is better to convert the value to Double for multiplication as already suggested in Solution 1, as shown below:

c = Convert.ToDouble(DataGridView1.Item(j + 3, r + 1).value) * Convert.ToDouble(DataGridView1.Item(j + 2, r + 1).value)

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