主要就是在没有AddOrUpdate方法的时候
主要就是在没有AddOrUpdate要领的时候，你想要转变数据库内的一条数据如何操纵
核心操纵（这里主要展示下如何只转变一个字段“ShipName”的值）
（转变整笔记录的值在Attach后面操纵db.Entry(order).State = EntityState.Modified;然后savechange即可，但是注意这样操纵是将新建的order东西对应的字段全部替换了）
[HttpPost] public ActionResult Edit() { int orderID = int.Parse(HttpContext.Request["orderID"]); string shipName = HttpContext.Request["shipname"]; Orders order = new Orders { OrderID = orderID,ShipName = shipName }; db.Set<Orders>().Attach(order); db.Entry(order).Property("ShipName").IsModified = true; db.Entry(order).Property("ShipName").CurrentValue = shipName; db.SaveChanges(); return Redirect("/Orders/Edit/?id="+orderID); }
后台代码：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Mvc; using System.Data.Entity; using T1_EF.Models; namespace T1_EF.Controllers { public class OrdersController : Controller { DbContext db = new NorthwindEntities(); // GET: Orders public ActionResult Index() { var list = from order in db.Set<Orders>() select order; ViewData.Model = list; return View(); } public ActionResult Edit(int id) { var data = db.Set<Orders>().Where(o=>o.OrderID==id).FirstOrDefault(); ViewData.Model = data; return View(); } [HttpPost] public ActionResult Edit() { int orderID = int.Parse(HttpContext.Request["orderID"]); string shipName = HttpContext.Request["shipname"]; Orders order = new Orders { OrderID = orderID,ShipName = shipName }; db.Set<Orders>().Attach(order); db.Entry(order).Property("ShipName").IsModified = true; db.Entry(order).Property("ShipName").CurrentValue = shipName; db.SaveChanges(); return Redirect("/Orders/Edit/?id="+orderID); } } }
View Code前台代码Index.cshtml：
@model IEnumerable<T1_EF.Models.Orders> @{ Layout = null; } <!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width" /> <title>Index</title> </head> <body> <div> <table border="1"> <tr> <td>订单编号</td> <td>客户名称</td> <td>船舶公司</td> <td>船名</td> <td>改削</td> </tr> @foreach (var item in Model) { <tr> <td>@item.OrderID</td> <td>@item.Customers.CompanyName</td> <td>@item.Shippers.CompanyName</td> <td>@item.ShipName</td> <td><a href="@Url.Action("Edit","Orders")?id[email protected]">改削</a></td> </tr> } </table> </div> </body> </html>
View CodeEdit.cshtml：
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