How to read datagridview cell and text color from XML file?

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Hi,
I have added right click menu for DGV. The menu has cell/text color changing feature.
But when I close my application and re-open it, all my cell styles return to default. So, I tried to save those information to an xml file. I created a class for writing xml as follows:

C#

namespace DataGridView
{
    class DataGridViewColor
    {
        public static void WriteDataGridViewSettings(System.Windows.Forms.DataGridView dgv)
        {
            XmlTextWriter writer = new XmlTextWriter(Application.StartupPath + @"\MyGridColor.xml", null);
            writer.WriteStartDocument();
            writer.WriteStartElement(dgv.Name);
            int LastRow = dgv.Rows.Count-1;
            for (int i = 0; i < LastRow; i++)
            {
                for (int j = 0; j < dgv.Columns.Count - 1; j++)
                {
                    writer.WriteStartElement("CellColor");
                    writer.WriteString(dgv.Rows[i].Cells[j].Style.BackColor.ToString());
                    writer.WriteEndElement();
                    writer.WriteStartElement("TextColor");
                    writer.WriteString(dgv.Rows[i].Cells[j].Style.ForeColor.ToString());
                    writer.WriteEndElement();
                }
            }
            writer.WriteEndElement();
            writer.WriteEndDocument();
            writer.Close();
        }

    }
}

I don't know how to read the information from my xml file and put then in DataGridView. Please help me to write reading class.

What I have tried:

I tried the following class for reading (It is not complete):

C#

public static void ReadDataGridViewColor(System.Windows.Forms.DataGridView dgv)
       {
           XmlDocument xmldoc = new XmlDocument();
           XmlNodeList xmlnode;
           FileStream fs = new FileStream(Application.StartupPath + @"\MyGridColor.xml", FileMode.Open, FileAccess.Read);
           xmldoc.Load(fs);
           xmlnode = xmldoc.GetElementsByTagName("column");

Posted 9-Jan-21 7:41am

Alex Dunlop

Updated 9-Jan-21 7:57am

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RickZeeland · Answer 1 · 2021-01-09T07:57:00

You can also use XElement.Load(@"MyGridColor.xml"), see:
How to load XML from a file - LINQ to XML | Microsoft Docs[^]
And: Reading XML documents using LINQ[^]

Example:

public static void WriteDataGridViewSettings(System.Windows.Forms.DataGridView dgv)
{
	XmlTextWriter writer = new XmlTextWriter(Application.StartupPath + @"\MyGridColor.xml", Encoding.UTF8);
	writer.WriteStartDocument();
	writer.WriteStartElement(dgv.Name);
	int LastRow = dgv.Rows.Count-1;
	
	for (int i = 0; i < LastRow; i++)
	{
		writer.WriteStartElement("Row");

		for (int j = 0; j < dgv.Columns.Count - 1; j++)
		{
			writer.WriteStartElement("CellColor");
			// This will only work if you use named colors
			writer.WriteString(dgv.Rows[i].Cells[j].Style.BackColor.Name);
			writer.WriteEndElement();
			writer.WriteStartElement("TextColor");
			writer.WriteString(dgv.Rows[i].Cells[j].Style.ForeColor.Name);
			writer.WriteEndElement();
		}

		writer.WriteEndElement();
	}

	writer.WriteEndElement();
	writer.WriteEndDocument();
	writer.Close();
}

Then you can read the file simply like this:

XElement xml = XElement.Load("MyGridColor.xml");

Optional: to produce a more nicely formatted output to the xml file you can use:

writer.WriteWhitespace("\n");

See example here: https://www.dotnetperls.com/xmltextwriter[^]