Change row color in DataGridView based on column date

问题

I have got a DataGridView with several columns, one being the "Calibration Due Date". I'm looking for a way to change the color of a row to RED if the calibration due date has passed, and to BLUE if there is less than one month until the calibration due date.

I have tried the following code which didn't do anything:

private void Form1_Load(object sender, EventArgs e)
{
    foreach (DataGridView row in instrumentsDataGridView.Rows)
    {
        var now = DateTime.Now;
        var expirationDate = DateTime.Parse(instrumentsDataGridView.Columns["CalibrationDue"].ToString());
        var Month = expirationDate.AddDays(-30);

        if (now > Month && now < expirationDate)
            row.DefaultCellStyle.BackColor = Color.Blue;
        else if (now > expirationDate)
            row.DefaultCellStyle.BackColor = Color.Red;
    }
}

回答1:

Do it in the CellFormatting event:

private void DataGridView_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    if (e.ColumnIndex == instrumentsDataGridView.Columns["CalibrationDue"].Index)
    {
        if (e.Value == null)
            return;

        var now = DateTime.Now;
        var expirationDate = (DateTime)e.Value;
        var month = expirationDate.AddDays(-30);

        var row = instrumentsDataGridView.Rows[e.RowIndex];

        if (now > month && now < expirationDate)
            row.DefaultCellStyle.BackColor = Color.Blue;
        else if (now > expirationDate)
            row.DefaultCellStyle.BackColor = Color.Red;
    }
}

回答2:

You can use the DataGridViewRow.Cells Property:

DateTime now = DateTime.Now, thirtyDaysAgo = now.AddDays(-30), expirationDate;

foreach (DataGridViewRow row in instrumentsDataGridView.Rows)
{
    string cellText = row.Cells["CalibrationDue"].Value + "";

    if (DateTime.TryParse(cellText, out expirationDate))
    {
        if (expirationDate < now)
            row.DefaultCellStyle.BackColor = Color.Red;
        else if (expirationDate > thirtyDaysAgo)
            row.DefaultCellStyle.BackColor = Color.Blue;
    }
}

回答3:

I was putting the code in the wrong place. I've put the following code into another form's source code (form for entering details into the DataGridView) and it is now working:

 DateTime now = DateTime.Now, thirtyDaysAgo = now.AddDays(-30), expirationDate;

        foreach (DataGridViewRow row in form.instrumentsDataGridView.Rows)
        {
            string cellText = row.Cells["CalibrationDue"].Value + "";

            if (DateTime.TryParse(cellText, out expirationDate))
            {
                if (expirationDate < now)
                    row.DefaultCellStyle.BackColor = Color.Red;
                else if (expirationDate > thirtyDaysAgo)
                    row.DefaultCellStyle.BackColor = Color.PaleTurquoise;
            }
        }

来源：https://stackoverflow.com/questions/40749012/change-row-color-in-datagridview-based-on-column-date

标签

datagridview

rows