添加项目文件。

CowainHmi/Helper/DataGridViewStyle.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace CowainHmi
+{
+    public class DataGridViewStyle
+    {
+        /// <summary>
+        /// 给DataGridView添加行号
+        /// </summary>
+        /// <param name="dgv"></param>
+        /// <param name="e"></param>
+        public void DgvRowPostPaint(DataGridView dgv, DataGridViewRowPostPaintEventArgs e)
+        {
+            try
+            {
+                //添加行号 
+                SolidBrush v_SolidBrush = new SolidBrush(dgv.RowHeadersDefaultCellStyle.ForeColor);
+                int v_LineNo = 0;
+                v_LineNo = e.RowIndex + 1;
+                string v_Line = v_LineNo.ToString();
+                e.Graphics.DrawString(v_Line, e.InheritedRowStyle.Font, v_SolidBrush, e.RowBounds.Location.X + 15, e.RowBounds.Location.Y + 5);
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show("添加行号时发生错误，错误信息：" + ex.Message, "操作失败");
+            }
+        }
+    }
+}