DatagridView BindingList PropertyChanged

Question

When the button_click changed the NIndex property ,And i want to change the cell's background . The problem is the CellValueChanged don't work. Could tell me how to change the cell'background when the cell's value changed,please.

Answer 1

Hi @GuoLearn ，Welcome to Microsoft Q&A,

You can use DataGridViewCell to pick selected cell and then modify its background.

The key code is:

private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (e.RowIndex >= 0 && e.ColumnIndex >= 0)
    {
        DataGridViewCell cell = dataGridView1.SelectedCells[0];
        cell.Style.BackColor = System.Drawing.Color.Red;
    }
}

Below is my sample code:

using System;
using System.ComponentModel;
using System.Windows.Forms;

namespace _8_14_x
{
    public partial class Form1 : Form
    {
        // Declare a new BindingListOfT with the Part business object.
        BindingList<Part> listOfParts;
        private void InitializeListOfParts()
        {
            // Create the new BindingList of Part type.
            listOfParts = new BindingList<Part>();

            listOfParts.AllowNew = false;
            listOfParts.AllowRemove = false;

            // Raise ListChanged events when new parts are added.
            listOfParts.RaiseListChangedEvents = true;

            // Add a couple of parts to the list.
            listOfParts.Add(new Part("Widget", 1234));
            listOfParts.Add(new Part("Gadget", 5647));
        }
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            InitializeListOfParts();
            dataGridView1.DataSource = listOfParts;
            dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;

        }
        private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex >= 0 && e.ColumnIndex >= 0)
            {
                DataGridViewCell cell = dataGridView1.SelectedCells[0];
                cell.Style.BackColor = System.Drawing.Color.Red;
            }
        }

        private void Edit_button_Click(object sender, EventArgs e)
        {
            if (dataGridView1.CurrentRow.Index == -1)
                return;
            DataGridViewCell cell = dataGridView1.SelectedCells[0];
            cell.Value = "123";
        }
    }

    // A simple business object for example purposes.
    public class Part
    {
        private string name;
        private int number;
        public Part() { }
        public Part(string nameForPart, int numberForPart)
        {
            PartName = nameForPart;
            PartNumber = numberForPart;
        }

        public string PartName
        {
            get { return name; }
            set { name = value; }
        }

        public int PartNumber
        {
            get { return number; }
            set { number = value; }
        }
    }
}

Best Regards,

Jiale

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