页面之间9种数据传递

Session
Application
QueryString
Cache    前4个传递方法一样
Server.Transfer
HttpConetext
Cookie
文件传输
数据库

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApp
{
    public partial class WebForm2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        }

        internal int Addparm { get; set; }

        protected void Button1_Click(object sender, EventArgs e)
        {
            Addparm = 1;
            Server.Transfer("WebForm1.aspx");
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            Context.Items["Id"] = 2;
            Server.Transfer("WebForm1.aspx");
        }

        protected void Button4_Click(object sender, EventArgs e)
        {
            Response.Cookies.Add(new HttpCookie("Id", "3"));
            Response.Redirect("WebForm1.aspx");
        }

        protected void Button5_Click(object sender, EventArgs e)
        {
            Cache["Id"] = 4;
            Response.Redirect("WebForm1.aspx");
        }

        protected void Button3_Click(object sender, EventArgs e)
        {
            using (var _writer = new StreamWriter(Server.MapPath("a.txt")))
            {
                _writer.Write("5");
                _writer.Close();
            }
            Response.Redirect("WebForm1.aspx");
        }
    }
}

取数据:

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

namespace WebApp
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            /*
            // Services.Transfer
            var id = ((WebForm2) PreviousPage).Addparm;
            */

            /*
            //HttpContext
            var id = Context.Items["Id"];
            */

            /*
            //Cookies
            var id = Request.Cookies["Id"].Value;
            */

            /*
            //Cache
            var id = Cache["Id"];
             */
            string id = null;
            using (var _reader = new StreamReader(Server.MapPath("a.txt")))
            {
                id = _reader.ReadToEnd();
                _reader.Close();
            }
            Response.Write(id);
        }
    }
}