C#检查datagridview列是否为空

Question

我想检查datagridview中的"many"列是否为空.

我的代码

        for (int i = 0; i < (gridx.Rows.Count - 1); i++)
        {
            col = gridx.Rows[i].Cells["code"].Value.ToString();
            col4 = gridx.Rows[i].Cells["many"].Value.ToString();                
        }

        if (col4 == "")
        {
            MessageBox.Show("Many is empty");
            this.Focus();
            return;
        } 
        else
        {
          //my code in here
        }

但它没有显示错误"很多是空的"

请帮帮我..谢谢之前

Answer 1

由于您要col4在for循环中指定最后一个单元格值,因此可以将其作为null进行检查.

for (int i = 0; i < (gridx.Rows.Count - 1); i++)
        {
            col = gridx.Rows[i].Cells["code"].Value.ToString();
            if(gridxRows[i].Cells["many"].Value == null ||       
               gridxRows[i].Cells["many"].Value == string.Empty)
             {
                col4 = gridx.Rows[i].Cells["many"].Value.ToString();
             }
         }

您当前的代码只会检查最后一行cell["many"]是否为空.如果您想确保所有列都是空的,那么您可以尝试以下方法.

bool isColumnEmpty = true;
for (int i = 0; i < (gridx.Rows.Count - 1); i++)
        {
            col = gridx.Rows[i].Cells["code"].Value.ToString();
            if(gridxRows[i].Cells["many"].Value == null ||       
               gridxRows[i].Cells["many"].Value == string.Empty)
             {
                col4 = gridx.Rows[i].Cells["many"].Value.ToString();
                isColumnEmpty = false; // that means some thing is found against cell
             }
         }

现在检查是否设置了isColumnEmpty标志;

if(isCoulmnEmpty)
{
            MessageBox.Show("Many is empty");
            this.Focus();
            return;
}