Question

我想询问一行如何根据dataGridView中列的值自动更新其字体的颜色。

例如，一个表有4列：id, name, rentPayMent and check。

检查每一行是否有check == 0的任何值如果是，则此行的字体color = red Else do nothing

在运动中，我使用如下代码，但它带来错误

对象引用未设置为对象的实例，System.NullReferenceException未处理

private void dataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
    foreach (DataGridViewRow row in dataGridView1.Rows)
    {
        if (row.Cells[3].Value.ToString() == "0") //**Object reference not set to an instance of an object**
        {
            row.DefaultCellStyle.BackColor = Color.Red;  //then change row color to red
        }
    }
}

谢谢大家，我已经得到了解决方案。

    private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
    {
        if (dataGridView1.Rows[e.RowIndex].Cells[3].Value != null && !string.IsNullOrWhiteSpace(dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString()))
        {
            if (dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString().Trim() == "0")
                dataGridView1.Rows[e.RowIndex].DefaultCellStyle = new DataGridViewCellStyle { ForeColor = Color.Red };
        }
        else
        {
            dataGridView1.Rows[e.RowIndex].Cells[3].Style = dataGridView1.DefaultCellStyle;
        }

    }

Answer 1

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    if (dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value != null && !string.IsNullOrWhiteSpace(dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString()))
    {
        dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Style = new DataGridViewCellStyle { ForeColor = Color.Orange, BackColor = Color.Blue };
    }
    else
    {
        dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Style = dataGridView1.DefaultCellStyle;
    }
}

Answer 2

我在winform上做到了。

尝试下面的代码：

private void dataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
        {

            foreach (DataGridViewRow row in dataGridView1.Rows)
            {

                if (row.Cells["YourDatagridColumnName"].Value.ToString() == "0") //if check ==0
                {
                    row.DefaultCellStyle.BackColor = Color.Red;  //then change row color to red
                } 

            }

        }

最好的问候

Answer 3

我使用类似的东西：

private void dataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
    foreach (DataGridViewRow row in dataGridView1.Rows)
    {
        if(!string.IsNullOrEmpty(row.Cells[3].Value.ToString()))  // make sure the value is present
        (
          if (row.Cells[3].Value.ToString() == "0") 
          {
              row.DefaultCellStyle.BackColor = Color.Red;  //then change row color to red
          }
        )
    }
}

Answer 4

优先选择命名dataGridView中的列。例如，将列命名为colCheck。使用CellFormatting方法更改行字体颜色，如下所示

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{

    if (e.RowIndex > -1 && e.ColumnIndex == dataGridView1.Columns["colCheck"].Index)
        {
            if (e.Value != null)
            {

                if (dataGridView1.Rows[e.RowIndex].Cells["colCheck"].Value.ToString() == "1")
                {
                    for (int i = 0; i < this.dataGridView1.Columns.Count; i++ )
                    {
                        this.dataGridView1.Rows[e.RowIndex].Cells[i].Style.ForeColor = Color.Red;
                    }

                }
                else
                {
                    for (int i = 0; i < this.dataGridView1.Columns.Count; i++ )
                    {
                        this.dataGridView1.Rows[e.RowIndex].Cells[i].Style.ForeColor = Color.Black;
                    }
                }
            }
        }


}

Answer 5

我个人会使用JavaScript来处理这个逻辑。但是如果将它放在CodeBehind中是绝对必须的，我会检查该单元格的值是否为“0”。如果是这样，我会添加一个“红色”（或您选择的任何名称）的CssClass，然后编写CSS以获得颜色值。这至少可以使维护更容易，而不是让服务器端处理颜色。

（datagridview）根据列值更新行字体颜色

5 个答案: