如何在ASP.NET MVC 4中使用viewmodel（IEnumerable）更新我的數據庫

Question

{WV_DeviceReg, WV_DevEventLog, WV_DevSystemLog, WV_DeviceConfig}是我的ADO.NET實體框架模型。

視圖模型

namespace MvcWebVms.Models 
{ 
    public class HomeViewModels 
    { 
     public IEnumerable<WV_DeviceReg> DeviceReg { get; set; } 
     public IEnumerable<WV_DevEventLog> DevEventLog { get; set; } 
     public IEnumerable<WV_DevSystemLog> DevSystemLog { get; set; } 
     public IEnumerable<WV_DeviceConfig> DeviceConfig { get; set; } 
    } 
} 

查看

@model MvcWebVms.Models.HomeViewModels 

@using (Html.BeginForm()){ 

    <div> 

     @foreach (var item in Model.DeviceConfig) { 

      @Html.HiddenFor(modelItem => item.FieldName) 
      @Html.HiddenFor(modelItem => item.DeviceID_F) 

      <div class="editor-label"> 
        @Html.DisplayFor(modelItem => item.FieldName) 
      </div> 
      <div class="editor-field"> 
        @Html.EditorFor(modelItem => item.FieldValue) 
      </div> 

     } 
     <input type="submit" value="Apply" /> 

    </div> 
} 

控制器

public ActionResult Setting(string id) 
{ 
    HomeServices service = new HomeServices(); 
    return View(service.GetDeviceSettingAT(id)); 
} 

public WVDBEntities wvdb = new WVDBEntities(); 

[HttpPost] 
public ActionResult Setting(HomeViewModels viewModels) 
{ 

    if (ModelState.IsValid) 
    { 

    foreach (????????????) 
     { 
      ???????????????? 
     } 
     wvdb.SaveChanges(); 
     return View(viewModels); 
    } 
    else 
    { 
     return View(); 
    } 

} 

表

WV_DeviceConfig { FieldName(PK), DeviceID_F(PK), FieldValue, ServerTime } 

FieldName的映射關鍵字FieldValue的映射值

問：如何使用foreach更新我的數據庫？

Answer 1

我覺得首先你要你的foreach循環改變傳統的for循環和後背部，像這樣的列表：

@for (int i = 0; i < Model.DeviceConfig.Count(); i ++) { 
     @Html.HiddenFor(m => m.DeviceConfig[i].FieldName) 
//etc.. same thing for all hidden/input fields 

和動作方法能接受像這樣

[HttpPost] 
public ActionResult Setting(List<DeviceConfig> DeviceConfigList) 

列表

，然後你可以做以下更新數據庫

foreach (var item in DeviceConfigList) 
    { 
     db.Entry(item).State = EntityState.Modified; 
    } 
db.SaveChanges();