使用int.parse添加值

Question

我正在遍歷一些excel單元格以求和單元格的值，某些單元格為空，並且Input string was not in the correct format傳遞它們時，我收到了Input string was not in the correct format錯誤的錯誤。 這是我的代碼：

     int total = 0;
        int rowstart = 4;
        while (ws.Cells[rowstart, 1].Value.ToString() != "")
        {
           if (ws.Cells[rowstart, 1].Value.ToString() !=
                      ws.Cells[rowstart + 1, 1].Value.ToString())
           {
               ws.InsertRow(rowstart + 1, 1);
               ws.Cells[rowstart + 1, 3].Value = total;
           }
           else
           {
         total = total + int.Parse(ws.Cells[rowstart, 3].Value.ToString()); 
// I'm adding the value of Column 3 to the variable total, 
I get the error if the cell is empty
               rowstart = rowstart + 1;
           }
        }

我以為這是因為您無法解析空字符串，所以如果單元格為空，我如何只添加0？

Answer 1

使用int.TryParse ：

int parsed;
int.TryParse(ws.Cells[rowstart, 3].Value.ToString(), out parsed)
total += parsed;

如果字符串不是數字，則parsed為0。

Answer 2

使用int.TryParse而不是int.Parse

int total = 0;
int rowstart = 4;

while (ws.Cells[rowstart, 1].Value.ToString() != "")
{
int val=0;
if (ws.Cells[rowstart, 1].Value.ToString() != ws.Cells[rowstart + 1, 1].Value.ToString())
{
   ws.InsertRow(rowstart + 1, 1);
   ws.Cells[rowstart + 1, 3].Value = total;
}
else
{ 
int.TryParse(ws.Cells[rowstart, 3].Value.ToString(), out val);
    total = total + val; 
   // I'm adding the value of Column 3 to the variable total, I get the error if the cell is empty
   rowstart = rowstart + 1;
}

}

Answer 3

試試下面的代碼

else
{ 
  If (int.TryParse(ws.Cells[rowstart, 3].Value.ToString(), out result))
    total = total +int.Parse(ws.Cells[rowstart, 3].Value.ToString());

   rowstart = rowstart + 1;
}