參數值爲空

下面的代碼顯示每個國家的複選框列表。打算保存哪個複選框被選中。但是當點擊提交按鈕時，在newmodel中的方法
ActionResult Index（UserModel newmodel）中，參數SelectedSecurityGroup，SelectedSecurityObject和SecurityGroups的值爲null。參數值爲空

任何想法這段代碼有什麼問題？

在UserModel.cs

public class UserModel 
{ 
    public string SelectedSecurityGroup { get; set; } 
    public string SelectedSecurityObject { get; set; } 

    [DisplayName("Security Group")] 
    public virtual ICollection<SecurityGroup> SecurityGroups { get; set; } 
} 

public class SecurityGroup 
{ 
    public int Id { get; set; } 
    public string SecurityGroupName { get; set; } 
    public bool Active { get; set; } 
}

在UserController.cs

[HttpGet] 
public ActionResult Index() 
{ 
    UserModel objUserModel = new UserModel(); 

    List<SecurityGroup> lstSecurityGroup = FillViewBag(); 
    objUserModel.SecurityGroups = lstSecurityGroup; 
    return View(objUserModel); 
} 

[HttpPost] 
public ActionResult Index(UserModel newmodel) 
{ 
    string strtest = ""; 

    //Code to save data 

    return View(newmodel); 
} 

private List<SecurityGroup> FillViewBag(UserModel model = null) 
{ 
    List<SecurityGroup> lstSecurityGroup = new List<SecurityGroup>(); 
    lstSecurityGroup.Add(new SecurityGroup { Id = 1, SecurityGroupName = "India", Active = true }); 
    lstSecurityGroup.Add(new SecurityGroup { Id = 2, SecurityGroupName = "USA", Active = true }); 
    lstSecurityGroup.Add(new SecurityGroup { Id = 3, SecurityGroupName = "Pakistan", Active = false }); 
    lstSecurityGroup.Add(new SecurityGroup { Id = 4, SecurityGroupName = "Nepal", Active = false }); 

    return lstSecurityGroup; 
}

在Index.cshtml

@model Example.User.Web.Models.UserModel 

<!DOCTYPE html> 
<html> 
<head> 
    <title>Dashboard</title> 
    <script src="~/Scripts/jquery-1.11.0.js"></script> 
    <script src="~/Scripts/jquery.unobtrusive-ajax.min.js"></script> 

</head> 
<body> 
    <div> 
     <div> 
      <div id="lists"> 
       @Html.Partial("SecurityListsView", Model) 
      </div> 
     </div> 
    </div> 
</body> 
</html>

在SecurityListsView.cshtml

@model Example.User.Web.Models.UserModel 

@using (Ajax.BeginForm("Index", "User", new AjaxOptions() { UpdateTargetId = "lists" })) 
{  
    <table> 
     @{ int i = 0; } 
     @foreach (var item in Model.SecurityGroups) 
     { 
      <tr> 
       <td> 
        @Html.CheckBox("fileName", item.Active) 
        @Html.Hidden("fileId", item.Id) 
       </td> 
       <td> 
        @Html.DisplayFor(modelItem => item.SecurityGroupName) 
      </tr> 
      i++; 
     } 
    </table> 
    <input type="submit" name="btn1" value="Save" /> 
}

來源

2014-03-29 Nands

終於搞定了。下面是更正後的代碼：在SecurityListsView.cshtml

@model Example.User.Web.Models.UserModel 


@using (Html.BeginForm("Index", "User", "POST")) 
{ 
    <table> 
     @{ int i = 0; } 
     @foreach (var newitem in Model.SecurityGroups) 
     { 
      <tr> 
       <td> 
        @Html.CheckBoxFor(model => model.SecurityGroups[i].Active) 
        @Html.HiddenFor(model => model.SecurityGroups[i].Id, "Value") 
       </td> 
       <td> 
       @Html.DisplayFor(model => model.SecurityGroups[i].SecurityGroupName) 

      </tr> 
      i++; 
     } 
    </table> 
    <input type="submit" name="btn1" value="Save" /> 
}

希望它可以幫助別人！ :)

來源

2014-04-01 04:47:01 Nands

回答

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