DataGridView添加行号隔行变色

运行效果

颜色对应关系

类实现代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    internal class DataGridViewLine: DataGridView
    {
        private void DefaultColorSet()
        {
            CellStyle_ForeColor = Color.Blue;
            CellStyle_BackColor = Color.Beige;
            CellStyle_SelectionForeColor = Color.Yellow;
            CellStyle_SelectionBackColor = Color.Orange;

            RowsDefaultCellStyle_BackColor = Color.Bisque;
            AlternatingRowsDefaultCellStyle_BackColor = Color.Beige;

        }
        public DataGridViewLine()
        {
            //默认颜色设置
            DefaultColorSet();

            this.CellPainting += new DataGridViewCellPaintingEventHandler(this.dataGridView1_CellPainting);
            SetFontAndColors();
        }
        //重绘界面
        private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
        {
            if (e.RowIndex >= 0 && e.ColumnIndex == -1)
            {
                e.Paint(e.CellBounds, DataGridViewPaintParts.All & ~DataGridViewPaintParts.ContentForeground);
                using (Brush brush = new SolidBrush(e.CellStyle.ForeColor))
                {
                    e.Graphics.DrawString((e.RowIndex + 1).ToString(), e.CellStyle.Font, brush, e.CellBounds.Location.X + 10, e.CellBounds.Location.Y + 4);
                }
                e.Handled = true;
            }
            //SetFontAndColors();
        }

        //表格字体颜色设置
        private void SetFontAndColors()
        {
            this.DefaultCellStyle.Font = new Font(this.Font.Name, this.Font.Size);// new Font("Tahoma", 15);
            this.DefaultCellStyle.ForeColor = CellStyle_ForeColor;// Color.Blue;
            this.DefaultCellStyle.BackColor = CellStyle_BackColor;// Color.Beige;
            this.DefaultCellStyle.SelectionForeColor = CellStyle_SelectionForeColor;// Color.Yellow;
            this.DefaultCellStyle.SelectionBackColor = CellStyle_SelectionBackColor;// Color.Orange;

            this.RowsDefaultCellStyle.BackColor = RowsDefaultCellStyle_BackColor;// Color.Bisque;
            this.AlternatingRowsDefaultCellStyle.BackColor = AlternatingRowsDefaultCellStyle_BackColor;// Color.Beige;
        }

        private Color _CellStyle_ForeColor;
       [Category("Appearance")]
        [Description("单元格前景色。")]
        public Color CellStyle_ForeColor { 
            get { return _CellStyle_ForeColor; } 
            set { _CellStyle_ForeColor = value; 
                SetFontAndColors(); } 
        }
        private Color _CellStyle_BackColor;
        [Category("Appearance")]
        [Description("单元格背景色。")]
        public Color CellStyle_BackColor
        {
            get { return _CellStyle_BackColor; }
            set { _CellStyle_BackColor = value; SetFontAndColors(); }
        }
        private Color _CellStyle_SelectionForeColor;
        [Category("Appearance")]
        [Description("选中单元格前景色。")]
        public Color CellStyle_SelectionForeColor
        {
            get { return _CellStyle_SelectionForeColor; }
            set { _CellStyle_SelectionForeColor = value; SetFontAndColors(); }
        }
        private Color _CellStyle_SelectionBackColor;
        [Category("Appearance")]
        [Description("选中单元格背景色。")]
        public Color CellStyle_SelectionBackColor
        {
            get { return _CellStyle_SelectionBackColor; }
            set { _CellStyle_SelectionBackColor = value; SetFontAndColors(); }
        }
        private Color _RowsDefaultCellStyle_BackColor;
        [Category("Appearance")]
        [Description("偶数数行背景色。")]
        public Color RowsDefaultCellStyle_BackColor
        {
            get { return _RowsDefaultCellStyle_BackColor; }
            set { _RowsDefaultCellStyle_BackColor = value; SetFontAndColors(); }
        }
        private Color _AlternatingRowsDefaultCellStyle_BackColor;
        [Category("Appearance")]
        [Description("奇数数行背景色。")]
        public Color AlternatingRowsDefaultCellStyle_BackColor
        {
            get { return _AlternatingRowsDefaultCellStyle_BackColor; }
            set { _AlternatingRowsDefaultCellStyle_BackColor = value; SetFontAndColors(); }
        }


    }
}

测试代码：

        private void Form1_Load(object sender, EventArgs e)
        {
            for (int i = 0; i < 10; i++)
            {
                int index = this.dataGridViewLine1.Rows.Add();//核心：通过返回值获取添加行的行索引
                this.dataGridViewLine1.Rows[index].Cells[0].Value = "1_"+ i.ToString();
                this.dataGridViewLine1.Rows[index].Cells[1].Value = "Esther";
                this.dataGridViewLine1.Rows[index].Cells[2].Value = "28";
                //如果有列标题，则可以用列标题的Name来赋值
                //this.dataGridView1.Rows[index].Cells["ID"].Value = "1";
                //this.dataGridView1.Rows[index].Cells["Name"].Value = "Esther";
                //this.dataGridView1.Rows[index].Cells["Age"].Value = "28";
            }
        }

参考链接

C#，WinForm DataGridView添加行号-罗分明网络博客 (luofenming.com)https://www.luofenming.com/show.aspx?id=2024040316370374