让DataGridView显示行号

  • DataGridView默认的属性中,不可设置显示行号。
    效果如下:



    为了表示行号,我们可以在DataGridView的RowPostPaint事件中进行绘制。
    RowPostPaint事件,具体可以参照MSDN。
    下面是实现代码:
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    using System;
    
        using System.Collections.Generic;
    
        using System.ComponentModel;
    
        using System.Data;
    
        using System.Drawing;
    
        using System.Drawing.Imaging;
    
        using System.Text;
    
        using System.Windows.Forms;
    
        namespace DrawRowIndex
    
        {
    
        public partial class Form1 : Form
    
        {
    
        public Form1()
    
        {
    
        InitializeComponent();
    
        }
    
        private void Form1_Load(object sender, EventArgs e)
    
        {
    
        dataGridView1.Dock = DockStyle.Fill;
    
        dataGridView1.DataSource = ImageCodecInfo.GetImageDecoders();
    
        }
    
        private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
    
        {
    
        Rectangle rectangle = new Rectangle(e.RowBounds.Location.X,
    
        e.RowBounds.Location.Y,
    
        dataGridView1.RowHeadersWidth - 4,
    
        e.RowBounds.Height);
    
        TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(),
    
        dataGridView1.RowHeadersDefaultCellStyle.Font,
    
        rectangle,
    
        dataGridView1.RowHeadersDefaultCellStyle.ForeColor,
    
        TextFormatFlags.VerticalCenter | TextFormatFlags.Right);
    
        }
    
        }
    
        }

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