Asp.net MVC 2 CascadingDropDown

Question

嗨，這是我的控制器代碼：

public ActionResult Create() 
{ 
     makelist = new SelectList(db.CountryMasters.ToList(), "CountryID", "CountryName",1); 
     ViewData["CounrtyMaster"] = makelist; 

     var modelList = new CascadingSelectList(clientMasterManagement.GetState(makelist.SelectedValue.ToString()), "StateID", "StateName"); 
     ViewData["StateMaster"] = modelList; 

     return View("Create"); 
} 

，這是我查看代碼：

<div class="editor-field"> 
    <%= Html.DropDownList("CountryID", ViewData["CounrtyMaster"] as SelectList)%> 
    <%= Html.ValidationMessageFor(model => model.CountryID) %> 
</div> 

<%= Html.CascadingDropDownList("StateMaster","CountryMaster")%> 

當我選擇上列表它不影響第二個

，有人能幫我一下嗎？？？

Answer 1

在你的控制器操作的用戶CascadingSelectList功能，而不是SelectList

var makelist = new SelectList(db.CountryMasters.ToList(), "CountryID", "CountryName",1); ViewData["CounrtyMaster"] = makelist; 
var modelList = new CascadingSelectList(clientMasterManagement.GetState(makelist.SelectedValue.ToString()), "StateID", "StateName"); 
ViewData["StateMaster"] = modelList; 

Answer 2

Html.CascadingDropDownList不是一個標準的MVC幫手。我認爲你使用的是Stephen Walther's helper。如果是的話這個問題會幫助你：

ASP.NET MVC - Cascading Drop Down