Question

[
  {
    "id": "133",
    "label": "S/M",
    "price": "0",
    "oldPrice": "0",
    "products": [
      "318",
      "321",
      "324",
      "327"
    ]
  },
  {
    "id": "132",
    "label": "L/XL",
    "price": "0",
    "oldPrice": "0",
    "products": [
      "319",
      "322",
      "325",
      "328"
    ]
  },
  {
    "id": "131",
    "label": "XXL/XXXL",
    "price": "0",
    "oldPrice": "0",
    "products": [
      "320",
      "323",
      "326",
      "329"
    ]
  }
]

我希望得到＆＃39;标签＆＃39;阵列＆＃34;产品＆＃34;包含＆＃34; 321＆＃34;。我怎么能做到这一点？我用了库json.net

i make linq expression 
JArray ja = JArray("this json");
JValue id = JValue.Parse("328");
ja.Select(x => x["label"]).Where(x => x["products"].Contains(id));

但我得到＆＃34;无法访问Newtonsoft.Json.Linq.JValue上的子值。＆＃34;

Answer 1

所以你应该先定义这个类：

class MyObj {
public string id { get; set; }
public string[] products { get; set; }
public string label { get; set; }

}

反序列化而不是对象：

 var deserialized = serializer.Deserialize<MyObj>(str);
 var result =  deserialized.Where(r => r.products.Contains("321")).ToList();

Answer 2

您需要使用JSON.NET之类的库。在这种情况下，你可以写这样的东西

string json = <your json string>;
var deserializedProduct = JsonConvert.DeserializeObject<List<Product>>(json).Where(p => p.products.Contains("321")).ToList();

产品

public class Product
{
    public string id { get; set; }
    public string[] products { get; set; }
    public string label { get; set; }
}

Answer 3

为此，您可以使用任何JSON库。例如JSON.NET

此LINQ to JSON样本

我如何从linq获取json的数据？

3 个答案: