帮手：

public static List<SelectListItem> ToSelectList(IDictionary<string,string> dictionaryItems,string selectedValue,string noSelection,bool search = false)
    {
        List<SelectListItem> items = new List<SelectListItem>();

        if (search)
        {
            items.Add(new SelectListItem { Selected = true,Value = "-1",Text = string.Format("-- {0} --",noSelection) });
        }

        foreach (var item in dictionaryItems)
        {
            items.Add(new SelectListItem
            {
                Text = item.Key,Value = item.Value,Selected = selectedValue == item.Value ? true : false
            });
        }

        return items
            .OrderBy(l => l.Text)
            .ToList();
    }

控制器：

[HttpGet]
    public ActionResult Index()
    {
        var model = new CreateModel();

        var parentOrganisations = _orgs.FindBy(o => o.OwningOrganisationID == Globals.OrganisationID || o.ID == Globals.OrganisationID)
            .OrderBy(o => o.OrganisationName);

        Dictionary<string,string> items = new Dictionary<string,string>();

        foreach (var item in parentOrganisations)
        {
            items.Add(item.OrganisationName,item.ID.ToString());
        }

        model.Organisations = SelectLists.ToSelectList(items,"-1","-- None -- ",true);

        return View(model);
    }

视图：

<div>
        <label>Parent Organisation</label>
        <div>
            @Html.DropDownListFor(m => m.ParentOrganisationID,Model.Organisations,new { @})
            <p>Select a parent organisation to create a branch</p>
        </div>
    </div>

控制器中似乎有很多重复的代码.它需要一个通用列表,将值和文本添加到字典中,然后将其用作帮助程序的输入,该帮助程序构建选择列表以作为模型的一部分发送.

有没有人有更好的方法来实现这一目标？我讨厌在我的控制器中臃肿,当我在表单上得到几个下拉时,这正是在这个实例中会发生的事情.

谢谢,

编辑 – 感谢Kenneth的帮助方法,我现在将整个事情整合到控制器中的一个调用中：

model.Organisations = _orgs.FindBy(o => o.OwningOrganisationID == Globals.OrganisationID || o.ID == Globals.OrganisationID)
            .OrderBy(o => o.OrganisationName)
            .ToList()
            .ToSelectList(org => org.OrganisationName,org => org.ID.ToString(),"None",true);

扩展方法：

public static List<SelectListItem> ToSelectList<T>(this List<T> Items,Func<T,string> getKey,string> getValue,noSelection) });
        }

        foreach (var item in Items)
        {
            items.Add(new SelectListItem
            {
                Text = getKey(item),Value = getValue(item),Selected = selectedValue == getValue(item) ? true : false
            });
        }

        return items
            .OrderBy(l => l.Text)
            .ToList();
    }

用法：

List<Org>() parentOrganisations = // fetch here
model.Organisations = parentOrganisations.ToSelectList(org => org.ID.ToString(),org => org.OrganisationName,true);

注意：我在SO编辑器中键入了这个,因此您可能会遇到一些语法错误(尽管它们应该很容易解决).

public class DirectorySearchModel
{
    [display(Name = "First name contains")]
    public string FirstName { get; set; }

    [display(Name = "Last name contains")]
    public string LastName { get; set; }

    public CountriesCollection Countries { get; set; }
    public IEnumerable<Country> SelectedCountries { get; set; }
    public IEnumerable<Country> AllCountries { get; set; }
}

CountriesCollection对象(第9行)如下所示：

public class CountriesCollection
{
    [display(Name = "Countries")]
    public int[] arrCountries { get; set; }
}

现在,我正在创建一个新的,空白的CountriesCollection实例,然后将其添加到DirectorySearchModel视图模型的空白实例中,然后将其全部序列化为Knockout.js的javascript视图模型：

{
"FirstName":null,"LastName":null,"Countries":{"arrCountries":[]},"SelectedCountries":[{"RelationshipManager":{},"CountryId":1,"CountryName":"UK"},{"RelationshipManager":{},"CountryId":2,"CountryName":"France"},"CountryId":3,"CountryName":"Spain"}],"AllCountries":[{"RelationshipManager":{},"CountryName":"Spain"}]
}

我的复选框呈现为：< input checked =“checked”data-bind =“checked：Countries.arrCountries”id =“Countries_arrCountries30”name =“Countries.arrCountries”type =“checkBox”value =“1”>.检查一对夫妇意味着你最终得到这个Knockout.js视图模型：

{
"FirstName":null,"Countries":{"arrCountries":["1","3"]},"CountryName":"Spain"}]
}

正常提交我的视图(即通过提交按钮而不是Knockout.js)到一个需要DirectorySearchModel的MVC操作,我可以请求model.Countries.arrCountries获取已检查项目的列表,但是当我使用…

$.post("/MyController/MyAction",ko.toJS(viewmodel),function(returnData) {
    $("#resultCount").html(returnData);
});

要么…

$.post("/MyController/MyAction",viewmodel,function(returnData) {
    $("#resultCount").html(returnData);
});

对于需要相同DirectorySearchModel的另一个动作,model.Countries.arrCountries始终为null！我想知道是否由于Knockout.js在MVC期待int [] s时将arrCountries条目发布为string [] s,但更改我的MVC代码以期望string [] s似乎没有太大变化……！ DirectorySearchModel中的CountriesCollection对象似乎存在,但是其中的arrCountries始终为null.

有任何想法吗？任何帮助非常感谢！

编辑

接收Knockout.js viewmodel的操作：

public MvcHtmlString ResultCount(DirectorySearchModel model)
{
    return new MvcHtmlString(getResultCount(model).ToString());
}

getResultCount方法：

public int getResultCount(DirectorySearchModel model)
{
    IUserRepository userRepository = new UserRepository();
    int count = userRepository.Search(model,null).Count();
    return count;
}

固定！

感谢Konstantin指出从$.post到$.ajax的简单切换将我的Knockout.js视图模型发送回我的mvc动作就是所有需要的！这是我正在使用的$.ajax代码：

$.ajax({  
    type: "POST",url: "/MyController/MyAction",data: ko.toJSON(viewmodel),contentType: "application/json; charset=utf-8",dataType: "json",success: function (data) {
        $("#resultCount").html(data);
    }
});

这是我的代码.

模型：

public class ROWModel
{
    #region Properties
    //Request
    public List<TBLRETURNABLEITEMS> TBLRETURNABLEITEMS { get; set; }
    //public List<ReturnReasons> ReturnReasons { get; set; }

    public int Order_No { get; set; }
    public string First_Name {get; set; }
    public string Last_Name {get; set; }
    public string Company { get; set; }
    public string Address_1 { get; set; }
    public string Address_2 { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string Postal_Code { get; set; }
    public string Email { get; set; }
    public string Phone { get; set; }
    public string CustomerCode {get; set; }
    public string TerritoryCode {get; set; }


    //Post

    #endregion

    #region Constructor
    public ROWModel()
    { }
    #endregion
}

public class ReturnableItems : IComparable<ReturnableItems>
{
    private int _id;
    private decimal _ordered;
    private decimal _shipped;

    public int Id
    {
        get { return _id; }
        set { _id = value; }
    }

    public decimal Ordered
    {
        get { return _ordered; }
        set { _ordered = value; }
    }

    public decimal Shipped
    {
        get { return _shipped; }
        set { _shipped = value; }
    }

}

填充模型并将其发送到视图后,将使用模型显示所有内容.我认为在表单标签上坚持这样的模型：

<% using (Html.BeginForm("Items","ROW",Model))

这是ROW控制器的post Items Action：

[ActionName("Items"),AcceptVerbs(HttpVerbs.Post)]
    public ActionResult Items(ROWModel model,FormCollection collection)

问题是Model没有返回我最初填充它的TBLRETURNABLEITEMS列表.它保留了我填充的其他属性,但不保留列表.如何维护此模型的数据,而不必在每个控制器上重新加载它.

所以像这样：

[AcceptVerbs(HttpVerbs.Get)]
    public ActionResult TestA()
    {
        MyModel model = new MyModel();
        model.something = "Test";
        return View(model);
    }

    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult TestA(MyModel model)
    {
        TempData["MyModel"] = model;
        return RedirectToAction("TestB");
    }

    [AcceptVerbs(HttpVerbs.Get)]
    public ActionResult TestB()
    {
        MyModel myModel = (MyModel)TempData["MyModel"];
        return View(myModel);
    }

我有一个模特.它的名字是Product.cs

Product
  {
    public int TypeId { get; set; }/*these are at the same time field of Type Table*/
    public string TypeName { get; set; }

    public int TradeMarkId { get; set; }/*at the same time field of TradeMark Table*/
    public string TradeMarkName { get; set; }

    public int ProductId { get; set; }/*at the same time field of TProduct Table*/
    public string ProductName { get; set; }
    public int TId { get; set; }
    public int TMId { get; set; }

    public List<TypeProduct> typeList { get; set; }
  }

我的控制器页面

My controller 
  [HttpGet]
  public ActionResult TradeMarkProduckAdd()
  {
    Product product = new Product();
    TypeList typeList = new TypeList();
    product = typeList.Typelistof(product);
    return View(product);//"This doesn't work"            
  }

它说一个类型错误
传递到字典中的模型项的类型为“TypeMark.Models.Product”,但此字典需要类型为“System.Collections.Generic.IEnumerable”1 [TypeMark.Models.Product]’的模型项.

当我收到此错误时,我更改了返回View(产品);至
return View((IEnumerable)product);但它再也没有用了.

查看页面

@using TypeTradeMark.Models
    @model IEnumerable<Product>
    @using (Html.BeginForm("AddProduct","Home",FormMethod.Post))
    {
      @foreach(var item in Model as List<Product>)
      {                              
        @item.ProductName
        @item.??//checkBox for every record      
        @item.??//dropdownlist for Trademarks      
      }    
    }

TypeList类

TypeList class

    public class TypeList
    {
      VtDataContext Vt = new VtDataContext();
      public Product Typelistof(Product typelistof)
      {          
        var query = (from c in Vt.Types select c);
        typelistof.typeList=new List<Type>(query.ToList());
        return typelistof;
      }
    }

我的桌子

Type : TypeId,TypeName
    TradeMark : TradeMarkId,TradeMarkName
    TProduct : ProductId,ProductName,TId,TMId//TId relation with TypeId,TMId relation with TradeMarkId

我无法解决问题你能帮助我吗？谢谢

尝试使用这样的东西：

return View(new List<Product> { product,product2 })