如何根据下拉选择显示复选框列表？

Question

以下是我的业务逻辑代码。我通过调用 web 服务获得低于 json 的信息，并将其反序列化为对象（如我的实体中所示）。现在，我想显示带有类别选择的下拉菜单，一旦用户选择了类别，它应该显示子类别的复选框列表。

根据我下面的代码，下拉菜单应该有“吃”和“娱乐”选项。如果用户选择“娱乐”，那么它应该显示“全部”、“电影”和“保龄球”作为复选框列表。谁能帮助我如何在 MVC3 和 C# 中拥有它？

JSON：

  {
  "Code":0,
  "Status":"Done",
  "Categories":[
              {
              "ID":1,
              "Name":"Eat",
              "Subcategories":[
                    {"Flag":false,"ID":100,"Name":"Food"},
                    {"Flag":false,"ID":101,"Name":"Fast Food"},         
                    {"Flag":false,"ID":102,"Name":"Other"}
                    ]
                    },
               {
               "ID":2,
               "Name":"Entertainment",
               "Subcategories":[
                        {"Flag":false,"ID":100,"Name":"All"},               
                        {"Flag":false,"ID":101,"Name":"Movie"},
                        {"Flag":false,"ID":102,"Name":"Bowling"}
                      ]
                     },
                     }
          ]
    }

实体：

 public class MyData
 {
   public int Code { get; set; }
   public string Status { get; set; }
   public List<Category> Categories { get; set; }
  }

  public class Category
  {
      public string Name { get; set; }
      public int ID { get; set; }
      public List<Subcategory> Subcategories { get; set; }
  }

   public class Subcategory
   {
     public string Name { get; set; }
     public int ID { get; set; }
     public bool Flag { get; set; }
   }

服务调用：

    public MyData GetAllCategories()
    {
           HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://host/data/categories/");

            request.ContentType = "application/json; charset=utf-8";
            request.Method = "GET";

            string returnJson = string.Empty;

            using (WebResponse response = request.GetResponse())
            {
                using (Stream stream = response.GetResponseStream())
                {
                    using (StreamReader reader = new StreamReader(stream))
                    {
                        while (!reader.EndOfStream)
                        {
                            returnJson += reader.ReadLine();
                        }
                    }
                }
            }

            MyData deserializedMyData = JsonConvert.DeserializeObject<MyData>returnJson 


            return deserializedMyData;
      }

Answer 1

在视图中使用以下代码 @model 我的数据

 @foreach (Category item in Model.Categories)
        {
<input type="checkbox" name="Categories" value="@item.categoryId" id="@item.categoryId"/>

        }