指定演员表无效， [英] Specified cast is not valid,

问题描述

double total = 0;

            foreach (DataGridViewRow row in gvpurchase.Rows)
            {
                if (!row.IsNewRow && row.Cells["paid"].Value != null)
                {
                    total += (double)row.Cells["paid"].Value;

                    //Convert.ToInt32(["paid"]);
                }
            }

            lbltotal.Text = total.ToString("N2");
        }




    }

< b>我尝试了什么：



我在Windows应用程序的标签中获得了网格视图总金额，但是我收到错误Specified Cast无效，如何解决这个错误。请给我一些想法。

What I have tried:

I get grid view sum amount in label for windows application, but i got a error Specified Cast is not valid, how to solve this error. Any one please give me ideas.

推荐答案

这行代码就是问题：

This line of code is the issue:

total += (double)row.Cells["paid"].Value;

错误说你无法转换为row.Cells [paid]中的任何内容。值。也许这是一片空白。无论如何，调试代码，你会看到。

The error says you cannot convert to double whatever is in row.Cells["paid"].Value. Perhaps it is a blank. Regardless, debug the code and you'll see.

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