c＃Datagridview（Winform）基于相邻单元格值的单元格着色

Question

Is it possible to color datagridview cell based on multiple conditions. I know I can change the color of the cells based on that cell value. but is it possible to add condition where i can also apply color based on adjacent cell value.

To compare the cell's date with current date i am using the code below.

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    if (dataGridView1.Columns[e.ColumnIndex].Name == "ACTION PROPOSED DATE")
    {
        if (e.Value == null || e.Value == System.DBNull.Value || e.ColumnIndex < 0 || e.RowIndex < 0)
        {
            return;
        }
        else
        {
            if (((DateTime) e.Value).Date < (DateTime) DateTime.Now.Date)
            {
                e.CellStyle.BackColor = Color.Red;
                e.CellStyle.ForeColor = Color.White;
            }
        }
    }
    // This section change the color of action proposed description column cell.
    // i want to change the color in "ACTION PROPOSED DATE"column, if "ACTION PROPOSED DESCRIPTION" contains file closed
    else if (dataGridView1.Columns[e.ColumnIndex].Name == "ACTION PROPOSED DESCRIPTION")
    {
        if (e.Value == null || e.Value == System.DBNull.Value || e.ColumnIndex < 0 || e.RowIndex < 0)
        {
            return;
        }
        else
        {
            string stringvalue = (string) e.Value;
            stringvalue = stringvalue.ToLower();
            if ((stringvalue.IndexOf("file closed") > -1))
            {
                e.CellStyle.BackColor = Color.Purple;
            }
        }
    }
}

I want to change the color in the "ACTION PROPOSED DATE" column cell to purple , if "ACTION PROPOSED DESCRIPTION" contains "file closed"

this is the result i get in datagridview

this is the result i am expecting

Before posting I have googled a lot, but I didn't get find any answer to my question. So I hope I didn't repeat this question.

Answer 1

The event args of the CellFormatting event indicate which cell is being formatted . But you can use other cells to determine how to format that cell.

For instance, to achieve your goal, you can use something like this:

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    if (e.ColumnIndex < 0 || e.RowIndex < 0) return;
    if (dataGridView1.Columns[e.ColumnIndex].Name == "ACTION PROPOSED DATE")
    {
        // Take the other column value for the same row
        var proposedDescription = dg.Rows[e.RowIndex].Cells["ACTION PROPOSED DESCRIPTION"].Value as string;
        if (proposedDescription != null && proposedDescription.IndexOf("file closed", StringComparison.CurrentCultureIgnoreCase) >= 0)
        {
             e.CellStyle.BackColor = Color.Purple;
             return;
        }
        if (e.Value == null || e.Value == System.DBNull.Value || e.ColumnIndex < 0 || e.RowIndex < 0)
        {
            return;
        }
        else
        {
            if (((DateTime) e.Value).Date < (DateTime) DateTime.Now.Date)
            {
                e.CellStyle.BackColor = Color.Red;
                e.CellStyle.ForeColor = Color.White;
            }
        }
    }
}

Answer 2

You can simply change this line of code

e.CellStyle.BackColor = Color.Purple;

to

// Note i did change the column name of ACTION PROPOSE DATE
// due to syntax property naming rules.
dataGridView1["ACTION_PROPOSED_DATE", e.RowIndex].Style.BackColor = Color.Purple

You have to change this also:

else if (dataGridView1.Columns[e.ColumnIndex].Name == "ACTION PROPOSED DESCRIPTION")

to

if (dataGridView1.Columns[e.ColumnIndex].Name == "ACTION PROPOSED DESCRIPTION")

that your program wont skip on checking your column proposed description.

You can add a condition that will also check if the adjacent cell value is file closed below this line of codes:

if (((DateTime) e.Value).Date < (DateTime) DateTime.Now.Date) 
{ 
    e.CellStyle.BackColor = Color.Red; 
    e.CellStyle.ForeColor = Color.White; 
} 

and make the current cell color to purple. To do that write this code:

if (dataGridView1["ACTION_PROPOSED_DESCRIPTION", e.RowIndex].Value.ToString() == "File Closed") 
{ 
    dataGridView1["ACTION_PROPOSED_DATE", e.RowIndex].Style.BackColor = Color.Purple;
}