DataTable实现列位置交换，用于SQL语句无法解决字段页面显示顺序问题

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class DataTableDemo : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
#region  添加一个表
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("ID", typeof(int)) { DefaultValue = 0 });
dt.Columns.Add(new DataColumn("Name", typeof(string)) { DefaultValue = "1" });
dt.Columns.Add(new DataColumn("Item", typeof(string)) { DefaultValue = "1" });
dt.Columns.Add(new DataColumn("ItemAmount", typeof(double)) { DefaultValue = 0 });

dt.Rows.Add(1, "小李", "基本工资", 60);
dt.Rows.Add(1, "小李", "业绩提成", 70);

dt.Rows.Add(2, "小张", "基本工资", 500);
dt.Rows.Add(2, "小张", "业绩提成", 60);
dt.Rows.Add(2, "小张", "奖金福利", 800);

dt.Rows.Add(3, "小王", "基本工资", 30);
dt.Rows.Add(3, "小王", "奖金福利", 900);
#endregion

DataTable dtSource = dt.Copy();

dt.Columns[3].SetOrdinal(1); //ItemAmount列放置到第二列 索引从0开始

//列移动前
GridView1.DataSource = dtSource;
GridView1.DataBind();
//列移动后
GridView2.DataSource = dt;
GridView2.DataBind();
}
}