如何使用C#检查datagridview中的空单元格和空单元格

Question

我试图检查datagridview单元格的空值和空值...但我不能正确...

for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
    if ((String)dataGridView1.Rows[i].Cells[3].Value == String.Empty)
    {
        MessageBox.Show(" cell is empty");
        return;
    }

    if ((String)dataGridView1.Rows[i].Cells[3].Value == "")
    {
        MessageBox.Show("cell in empty");
        return ;
    }
}

我甚至试过这个代码

if (String.IsNullOrEmpty(dataGridView1.Rows[i].Cells[3].Value))
{
  MessageBox.Show("cell is empty");
  return;
}

谁能帮我这个...

Answer 1

我会尝试这样的:

foreach (DataGridViewRow rw in this.dataGridView1.Rows)
{
  for (int i = 0; i < rw.Cells.Count; i++)
  {
    if (rw.Cells[i].Value == null || rw.Cells[i].Value == DBNull.Value || String.IsNullOrWhiteSpace(rw.Cells[i].Value.ToString())
    {
      // here is your message box...
    }
  } 
}

Answer 2

if (String.IsNullOrEmpty(dataGridView1.Rows[i].Cells[3].Value as String))
{
    MessageBox.Show("cell is empty");
    return;
}

添加as String，它对我有用。