MVC2中的基本操作（增、删、改、查）

控制器中代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcApplication1.Models;
using System.Text;

namespace MvcApplication1.Controllers
{
    public class talkController : Controller
    {
        //
        // GET: /talk/
        TalkDataContext dbTalk = new TalkDataContext();
        public static int pageIndex = 1,pageCount;
        public ActionResult Index(string msg)
        {
            if (pageIndex < 1)
            { pageIndex = 1; }
            int pageSize = 3;            
            List<talk> talkList = dbTalk.talk.ToList();
            int totalCount = talkList.Count;
            bool hasRemainder;
            int endNum=pageIndex * pageSize;
           // pageCount = (totalCount % pageSize == 0 )?( totalCount / pageSize ): (totalCount / pageSize + 1);
            if (totalCount % pageSize == 0)
            { pageCount = totalCount / pageSize; hasRemainder = false; }
            else
            { pageCount = totalCount / pageSize + 1; hasRemainder = true; }
            List<talk> newList = new List<talk>();
            if (hasRemainder)
            {
                if (pageIndex == pageCount)
                {
                    endNum = totalCount;
                }
            }           
            for (int i = (pageIndex - 1) * pageSize; i < endNum; i++)
            {
                newList.Add(talkList[i]);
            }
            ViewData["pageIndex"] = pageIndex;
            ViewData["pageCount"] = pageCount;
            ViewData["pageSize"] = pageSize;
            ViewData["totalCount"] = totalCount;
            ViewData["error"] = msg;
            return View(newList);//返回分页器实例到视图
            

        }
        //上一页
        public ActionResult prevPage()
        {
            string errorMsg = "";
            if (pageIndex > 1)
            {
                pageIndex -= 1;
            }
            else
            {
                errorMsg = "已经是第一页了！";
               // Response.Write("<script>alert('已经是第1页了！')</script>");
            }

            return RedirectToAction("Index", "talk", new { msg = errorMsg });
        }
        //下一页
        public ActionResult nextPage()
        {
            if (pageIndex < pageCount)
            {
                pageIndex += 1;
            }
            else
            {
                ViewData["error"] = "已经是第一页了";
               // Response.Write("<script>alert('已经是最后1页了！')</script>");
            }
            return RedirectToAction("Index");
        }
        //首页
        public ActionResult firstPage()
        {
            pageIndex = 1;
            return RedirectToAction("Index");
        }
        //尾页
        public ActionResult lastPage()
        {
            pageIndex = pageCount;
            return RedirectToAction("Index");
        }
        //跳到的页数     
        public ActionResult search()
        {
           string keyWord = Request.Form["keyWord"];
           var talk = dbTalk.talk.Where(m => m.name.IndexOf(keyWord)>=0);//dbTalk.talk.Where(m => m.name.Equals(keyWord) == true);//
           if (talk == null)
           { ViewData["error"] = "未找到相关信息！"; }
           else
           { ViewData["error"] = "Yes！";}
           ViewData.Model = talk;
           return View();
        }
        public ActionResult gotoPage(FormCollection formCollection)
        {
            string pageNum = formCollection["goto"];
            if (!int.TryParse(pageNum, out pageIndex))
            {
                pageIndex = 1;
            }
            else
            {
                if (pageIndex > pageCount || pageIndex < 1)
                { pageIndex = 1; }
            }
            return RedirectToAction("Index");
        }
        public void  Test()
        {
            Response.Write("<script>alert('已经是最后1页了！');location='Index'</script>");          
        }
        // GET: /talk/Details/5
        
        public ActionResult Details(int id)
        {
            var data = dbTalk.talk.First(m=>m.id==id);        
            return View(data);
        }
  
        //
        // GET: /talk/Create

        public ActionResult Create()
        {
            return View();
        } 

        //
        // POST: /talk/Create

        [HttpPost]
        public ActionResult Create(talk m)
        {
            try
            {
                // TODO: Add insert logic here
                talk t = new talk();
                UpdateModel(t,Request.Form.AllKeys);
                dbTalk.talk.InsertOnSubmit(t);
                dbTalk.SubmitChanges();
                //if (string.IsNullOrEmpty(m.name))
                //{
                //    ModelState.AddModelError("error", "用户名不能为空！");                  
                //    return View();
                //}
                //talk t = new talk();
                //t.name = m.name;
                //t.text = m.text;
                //t.time = m.time;
                //dbTalk.talk.InsertOnSubmit(t);
                //dbTalk.SubmitChanges();
                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }

        //
        // GET: /talk/Delete/5
 
        public ActionResult Delete(int id)
        {
             talk t = dbTalk.talk.First(m => m.id == id);
            //var t=from item in dbTalk.talk where item.id==id select item;
            //talk tt=t.First();
            return View(t);
        }

        //
        // POST: /talk/Delete/5

        [HttpPost]
        public ActionResult Delete(int id, FormCollection collection)
        {
            try
            {
                // TODO: Add delete logic here
                talk t = dbTalk.talk.First(m => m.id == id);
                dbTalk.talk.DeleteOnSubmit(t);
                dbTalk.SubmitChanges();
                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }

        //
        // GET: /talk/Edit/5
 
        public ActionResult Edit(int id)
        {
            talk t = dbTalk.talk.First(m => m.id == id);
            return View(t);
        }

        //
        // POST: /talk/Edit/5

        [HttpPost]
        public ActionResult Edit(int id, FormCollection collection)
        {
            try
            {
                // TODO: Add update logic here
               talk t= dbTalk.talk.First(m => m.id == id);
                UpdateModel(t, collection.AllKeys);           
                dbTalk.SubmitChanges();
                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }
    }
}