Question

我有两个模型如下：

员工模式

public int ID{get;set;}
public string name{get;set;}
public virtual Department Department{get;set;}

部门模型

public int ID{get;set;}
public string name{get;set;}

我在添加新员工时使用员工视图的下拉列表

员工编辑控制器

public ActionResult Edit(employee employee)
{
   ....
   ViewBag.ID = new SelectList(db.departments,"ID","Name",employee.ID);
   return View(employee);
}

在视图中：

@Html.DropDownList("ID")

添加新员工可以正确保存分部，但是当我编辑现有记录时，它不会保存。

我在俯瞰什么？

模型绑定：

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using AssetManagement.Models;

namespace AssetManagement.Controllers
{
    public class EmployeeController : Controller
    {
        private AssetContext db = new AssetContext();

        //
        // GET: /Employee/

        public ActionResult Index()
        {
            var employees = db.Employees.Include(e => e.Department);
            return View(employees.ToList());
        }

        //
        // GET: /Employee/Details/5

        public ActionResult Details(int id = 0)
        {
            Employee employee = db.Employees.Find(id);
            if (employee == null)
            {
                return HttpNotFound();
            }
            return View(employee);
        }

        //
        // GET: /Employee/Create

        public ActionResult Create()
        {
            ViewBag.ID = new SelectList(db.Departments, "ID", "Name");
            return View();
        }

        //
        // POST: /Employee/Create

        [HttpPost]
        public ActionResult Create(Employee employee)
        {
            if (ModelState.IsValid)
            {
                db.Employees.Add(employee);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.ID = new SelectList(db.Departments, "ID", "Name", employee.ID);
            return View(employee);
        }

        //
        // GET: /Employee/Edit/5

        public ActionResult Edit(int id = 0)
        {
            Employee employee = db.Employees.Find(id);
            if (employee == null)
            {
                return HttpNotFound();
            }
            ViewBag.IDList = new SelectList(db.Departments, "ID", "Name", employee.ID);
            return View(employee);
        }

        //
        // POST: /Employee/Edit/5

        [HttpPost]
        public ActionResult Edit(Employee employee)
        {

            if (ModelState.IsValid)
            {
                db.Entry(employee).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }
          ViewBag.IDList = new SelectList(db.Departments, "ID", "Name", employee.ID);

            return View(employee);
        }

        //
        // GET: /Employee/Delete/5

        public ActionResult Delete(int id = 0)
        {
            Employee employee = db.Employees.Find(id);
            if (employee == null)
            {
                return HttpNotFound();
            }
            return View(employee);
        }

        //
        // POST: /Employee/Delete/5

        [HttpPost, ActionName("Delete")]
        public ActionResult DeleteConfirmed(int id)
        {
            Employee employee = db.Employees.Find(id);
            db.Employees.Remove(employee);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        protected override void Dispose(bool disposing)
        {
            db.Dispose();
            base.Dispose(disposing);
        }
    }
}

公共课科{ public int ID {get; set;} public string Name {get;组; } public virtual Employee SiteContact {get;组; } public ICollection Assets {get;组; } }

public class Employee
{
    [Key, ForeignKey("Division")]
    public int ID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public virtual Department Department{ get; set; }
    public string Title { get; set; }
    public string Address { get; set; }
    public string City { get; set; }
    public string BuildingName { get; set; }
    public string Floor { get; set; }
}

Answer 1

实体框架未保存，因为Employee实体“employee”（编辑帖子中的参数）不在上下文中。再次调用控制器时，前一个上下文将被销毁，并且此实体不在实际上下文中。 Get和in Post中的db Context不一样。

因此，您必须搜索实体以进行编辑和修改。之后，您可以保存您的实体。

试试这个：

svmStruct = svmtrain(xdata,group,'options',my_options);

.net mvc下拉列表未更新

1 个答案: