Question

我用这段代码用条件改变行的颜色，但代码不起作用！我不知道为什么，我有一个错误：

未处理的类型异常 System.NullReferenceException'发生在db（项目名称）.exe
中

当我到达“color = dataGridView1.Rows ....”

时

我该怎么办？

while (true)
{
    color = dataGridView1[2, rowindex].Value.ToString();
    if (color == "IDLE")
    {
        dataGridView1.Rows[rowindex].DefaultCellStyle.BackColor = Color.Orange;
    }
    if (color == "ACTIVE")
    { dataGridView1.Rows[rowindex].DefaultCellStyle.BackColor = Color.Green; }
    if (color == "MAINTENANCE")
    { dataGridView1.Rows[rowindex].DefaultCellStyle.BackColor = Color.Purple; }
    if (color == "DISMISSED")
    { dataGridView1.Rows[rowindex].DefaultCellStyle.BackColor = Color.Red; }
    if (color == null)
    { break; }
    rowindex++;
}

Answer 1

foreach (DataGridViewRow row in dataGridView1.Rows)
{
    if (row.Cells["color"] == "IDLE")
    {
        row.DefaultCellStyle.BackColor = Color.Orange;
    }
    else
    if (row.Cells["color"] == "ACTIVE")
    { 
        row.DefaultCellStyle.BackColor = Color.Green; 
    }
    else
    if (row.Cells["color"] == "MAINTENANCE")
    { 
        row.DefaultCellStyle.BackColor = Color.Purple; 
    }
    else
    if (row.Cells["color"] == "DISMISSED")
    { 
        row.DefaultCellStyle.BackColor = Color.Red; 
    }
    //else
    //{ 
    //    break; //probably don't need this since the foreach will know when it's done looping through all the Rows
    //}
}

C＃着色的datagridview行

1 个答案: