c#Json獲取所有父子值

我有一個 json 字串。

json 字串中有多個子類別，具體取決于類別。我想把它們全部結合起來。它應該始終提供更高級別的最后一個子級別的 ID。

樣本 ：

Id   - Name
--     ----------
1239 - Accessory> Jewelery > wristband> Silver wristband 

誰能幫我 。謝謝

    {
  "categories": [
    {
      "id": 368,
      **"name": "Accessory ",**
      "parentId": null,
      "subCategories": [
        {
          "id": 396,
          **"name": "Jewelery ",**
          "parentId": 368,
          "subCategories": [
            {
              "id": 397,
              **"name": "wristband",**
              "parentId": 396,
              "subCategories": [
                {
                  "id": 1238,
                  "name": "Gold wristband",
                  "parentId": 397,
                  "subCategories": []
                },
                {
                  **"id": 1239,**
                  "name": "Silver wristband",
                  "parentId": 397,
                  "subCategories": []
                },
                {
                  "id": 2845,
                  "name": "Steel wristband",
                  "parentId": 397,
                  "subCategories": []
                },
                {
                  "id": 3171,
                  "name": "Pearl wristband",
                  "parentId": 397,
                  "subCategories": []
                },
                {
                  "id": 3883,
                  "name": "diamond wristband",
                  "parentId": 397,
                  "subCategories": []
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}

這是我的課

public class SubCategory
    {
        public int id { get; set; }
        public string name { get; set; }
        public int parentId { get; set; }
        public List<object> subCategories { get; set; }
    }

    public class Category
    {
        public int id { get; set; }
        public string name { get; set; }
        public object parentId { get; set; }
        public List<SubCategory> subCategories { get; set; }
    }

    public class Root
    {
        public List<Category> categories { get; set; }
    }

uj5u.com熱心網友回復：

我認為您可以洗掉 SubCategory，那List<object>在那里做什么？

假設你可以反序列化

public class Category
{
    public int id { get; set; }
    public string name { get; set; }
    public int? parentId { get; set; }   // int?
    public List<Category> subCategories { get; set; }  // <Category>
}

public class Root
{
    public List<Category> categories { get; set; }
}

那么你可以使用一個簡單的深度優先遞回訪問者：

string FindCategoryTrail(List<Category> categories, int id)
{
   foreach(var category in categories)
   {
       if (category.id == id)  return category.name;

       var trail = FindCategoryTrail(category.subCategories , id);
       if (trail != null)
       {
          return category.name   " > "   trail;
       }
   }
   return null;
}

并稱之為

string trail = FindCategoryTrail(myRoot.categories, 1239);

uj5u.com熱心網友回復：

使用 Linq，您可以展平嵌套串列：

public class Category
{
    public int id { get; set; }
    public string name { get; set; }
    public object parentId { get; set; }
    public List<Category> subCategories { get; set; }
}

public class Root
{
    public List<Category> categories { get; set; }
}

        IEnumerable<Category> Flatten(IEnumerable<Category> e) => e.SelectMany(c => Flatten(c.subCategories)).Concat(e);

        Root root = JsonConvert.DeserializeObject<Root>(File.ReadAllText(@"U:\test1.json"));
        var search = Flatten(root.categories).Where(c => c.id == 1239);

        foreach(var s in search)
        {
            System.Diagnostics.Debug.WriteLine($"id: {s.id}");
            System.Diagnostics.Debug.WriteLine($"name: {s.name}");
            System.Diagnostics.Debug.WriteLine($"parentid: {s.parentId}");
        }

標籤：C＃ json 。网

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