Question

所以这是我的代码：

        // converts JSON data to an object I can use to pull select data out of
        JObject o = JObject.Parse(data);

        // this works fine. I can go one layer deep for a single piece of data
        int count = (int)o["count"];
        Console.WriteLine("This: {0} should say 30", count);

        // this also works. I can go multiple layers deep for SINGLE pieces of data...
        string publisherOne = (string)o["recipes"][0]["publisher"];
        Console.WriteLine("This: {0} should say Closet Cooking", publisherOne);

        // this is where the issue is... I can't go multiple layers deep and
        // get single pieces of data from each JSON object
        List<string> allPublishers = o["recipes"]["publisher"].Select(t => (string)t).ToList();
        Console.WriteLine(allPublishers[2] + "should say picky palate");

数据是一串JSON，这里是我正在使用的样本:(它更长，但这已经足够了）

{
  "count": 30,
  "recipes": [
{
  "publisher": "Closet Cooking",
  "f2f_url": "http://food2fork.com/view/35186",
  "title": "Caprese Grilled Cheese Sandwich",
  "source_url": "http://www.closetcooking.com/2011/09/caprese-grilled-cheese-sandwich.html",
  "recipe_id": "35186",
  "image_url": "http://static.food2fork.com/Caprese2BGrilled2BCheese2BSandwich2B5002B21616ce448f5.jpg",
  "social_rank": 99.99999999999993,
  "publisher_url": "http://closetcooking.com"
},
{
  "publisher": "Closet Cooking",
  "f2f_url": "http://food2fork.com/view/35596",
  "title": "Spinach Pesto Grilled Cheese Sandwich",
  "source_url": "http://www.closetcooking.com/2010/05/spinach-pesto-grilled-cheese-sandwich.html",
  "recipe_id": "35596",
  "image_url": "http://static.food2fork.com/SpinachPestoGrilledCheeseSandwich50053b8a9a0.jpg",
  "social_rank": 99.99999999999862,
  "publisher_url": "http://closetcooking.com"
},
{
  "publisher": "Picky Palate",
  "f2f_url": "http://food2fork.com/view/484d98",
  "title": "Crock Pot Pesto Ranch Chicken Thighs",
  "source_url": "http://picky-palate.com/2012/09/20/pesto-ranch-crock-pot-chicken-thighs/",
  "recipe_id": "484d98",
  "image_url": "http://static.food2fork.com/CrockPotPestoRanchChickenThighs1text1300x248ca0b.jpg",
  "social_rank": 99.99999999941502,
  "publisher_url": "http://picky-palate.com"
},

前两个（count和publisherOne）工作非常好。 allPublishers应该是所有发布者的列表，但它会给我带来麻烦，因为发布者信息只是食谱数组中的一个数据。这是我在尝试这样做时使用的参考： http://www.newtonsoft.com/json/help/html/LINQtoJSON.htm 提前谢谢！

Answer 1

我会使用这些类

public class Recipe
{
    public string publisher { get; set; }
    public string f2f_url { get; set; }
    public string title { get; set; }
    public string source_url { get; set; }
    public string recipe_id { get; set; }
    public string image_url { get; set; }
    public double social_rank { get; set; }
    public string publisher_url { get; set; }
}

public class RootObject
{
    public int count { get; set; }
    public List<Recipe> recipes { get; set; }
}

和

反序列化为

var obj = JsonConvert.DeserializeObject<RootObject>(json)

现在您可以用编译时安全方式编写linq

PS：见http://json2csharp.com/

linq to json定位要反序列化的特定项

1 个答案: