Question

我正在尝试根据其中一列中的文本更改datagridviewer中行的颜色。我收到错误：对象引用未设置为第一个if语句行上的对象实例。我根据数据源填写了datagridviewer，代码也在下面。

[default]
Exten => 101,1,Answer
Exten => 101,n,NoOp(Test101)
Exten => 101,n,Dial(SIP/101,12,r)
Exten => 101,n,VoiceMail(101@interno-ipca)
Exten => 101,n,Hangup()

Exten => 102,1,Answer
Exten => 102,n,NoOp(Test102)
Exten => 102,n,Dial(SIP/102,12,r)
Exten => 102,n,VoiceMail(102@interno-ipca)
Exten => 102,n,Hangup()

Answer 1

使用RowPrePaint事件，不要对可能为null的对象使用.ToString()：

private void dataGridView1_RowPrePaint(object sender, DataGridViewRowPrePaintEventArgs e)
{
    if (e.RowIndex < 0) return;
    var row = (sender as DataGridView).Rows[e.RowIndex];
    string value = Convert.ToString(row.Cells["Primary Onc"].Value);
    //or in VS 2015: string value = row.Cells["Primary Onc"].Value?.ToString();

    if (value == "JMK")
        row.DefaultCellStyle.BackColor = Color.Green;
    else if (value == "DBF")
        row.DefaultCellStyle.BackColor = Color.Orange;
    else
        row.DefaultCellStyle.BackColor = Color.White;
}

Answer 2

以下是我测试的代码，它按预期工作。抱歉延误。

foreach (DataGridViewRow Row in dataGridView1.Rows) {
  DataRowView drv = (DataRowView)Row.DataBoundItem;
  if (drv != null) {
    if (drv.Row["Primary Onc"].ToString() == "JMK") {
      Row.DefaultCellStyle.BackColor = Color.Green;
    }
    else {
      if (drv.Row["Primary Onc"].ToString() == "DBF") {
        Row.DefaultCellStyle.BackColor = Color.Orange;
      }
      else {
        Row.DefaultCellStyle.BackColor = Color.White;
      }
    }
  }
}

希望这有帮助。

Answer 3

您必须使用DataGridViewCellStyle类我的解决方案：

     int max = dgv.Rows.Count;
 DataGridViewCellStyle style;
            for (int i = 0; i < max; i++)

                for (int j = 2; j < dgv.Columns.Count; j++)

                    if (dgv[j, i].Value.ToString() == "")
                    {
                        style = dgv[j, i].Style;
                        style.BackColor = Color.Red;
                        dgv[j, i].Style = style;
                    }

根据列中的文本更改行颜色

3 个答案: