使用LINQ查詢JSON

我有一個從API調用接收到的Json響應。它有幾個嵌套級別，如下所示（這是一個片段）：使用LINQ查詢JSON

"Items": [ 
    { 
    "Result": { 
     "Id": "191e24b8-887d-e111-96ec-000c29128cee", 
     "Name": "Name", 
     "StartDate": "2012-04-03T00:00:00+01:00", 
     "EndDate": null, 
     "Status": { 
     "Name": "Active", 
     "Value": 5 
     }, 
     "Client": { 
     "Id": "35ea10da-b8d5-4ef8-bf23-c829ae90fe60", 
     "Name": "client Name", 
     "AdditionalItems": {} 
     }, 
     "ServiceAgreement": { 
     "Id": "65216699-a409-44b0-8294-0e995eb05d9d", 
     "Name": "Name", 
     "AdditionalItems": { 
      "ScheduleBased": true, 
      "PayFrequency": { 
      "Id": "981acb72-8291-de11-98fa-005056c00008", 
      "Name": "Weekly", 
      "AdditionalItems": {} 
      }, 
      "PayCycle": [ 
      { 
       "Name": "Schedule Based", 
       "ScheduleBased": true, 
       "SelfBilling": false, 
       "Id": "a8a2ecc4-ff79-46da-a135-743b57808ec3", 
       "CreatedOn": "2011-09-16T23:32:19+01:00", 
       "CreatedBy": "System Administrator", 
       "ModifiedOn": "2011-09-16T23:32:19+01:00", 
       "ModifiedBy": "System Administrator", 
       "Archived": false 
      } 
      ] 
     } 
     }, 
} 
] 
...

我想要做的就是從retreive使用LINQ的PayCycle節點的數據。我可以在例如控制器使用下面的LINQ得到使用真實Result.ServiceAgreement.AdditionalItems.SchedultedBased的值項：

var result = from p in data["Data"]["Items"].Children() 
      where (bool)p["Result"]["ServiceAgreement"]["AdditionalItems"]["ScheduleBased"] == true 
      select new 
      { 
       Name = (string)p["Result"]["Client"]["Name"], 
       Id = (string)p["Result"]["Client"]["Id"] 
      };

現在我需要得到Result.ServiceAgreement.AdditionalItems.Paycycle.ScheduleBased和SelfBilling性能。我如何做到這一點，如果PayCycle也是一個數組，我如何獲得孩子，就像我在上面的Linq中使用Data.Items一樣，這樣我就可以在這兩個項目上使用where子句過濾器？

來源

2012-09-17 KDee

可以反序列化JSON成dynamic對象，然後使用LINQ對象：

[TestMethod] 
    public void TestMethod1() 
    { 
     const string json = @"""Items"": [ 
{ 
""Result"": { 
    ""Id"": ""191e24b8-887d-e111-96ec-000c29128cee"", 
    ""Name"": ""Name"", 
    ""StartDate"": ""2012-04-03T00:00:00+01:00"", 
    ""EndDate"": null, 
    ""Status"": { 
    ""Name"": ""Active"", 
    ""Value"": 5 
    }, 
    ""Client"": { 
    ""Id"": ""35ea10da-b8d5-4ef8-bf23-c829ae90fe60"", 
    ""Name"": ""client Name"", 
    ""AdditionalItems"": {} 
    }, 
    ""ServiceAgreement"": { 
    ""Id"": ""65216699-a409-44b0-8294-0e995eb05d9d"", 
    ""Name"": ""Name"", 
    ""AdditionalItems"": { 
     ""ScheduleBased"": true, 
     ""PayFrequency"": { 
     ""Id"": ""981acb72-8291-de11-98fa-005056c00008"", 
     ""Name"": ""Weekly"", 
     ""AdditionalItems"": {} 
     }, 
     ""PayCycle"": [ 
     { 
      ""Name"": ""Schedule Based"", 
      ""ScheduleBased"": true, 
      ""SelfBilling"": false, 
      ""Id"": ""a8a2ecc4-ff79-46da-a135-743b57808ec3"", 
      ""CreatedOn"": ""2011-09-16T23:32:19+01:00"", 
      ""CreatedBy"": ""System Administrator"", 
      ""ModifiedOn"": ""2011-09-16T23:32:19+01:00"", 
      ""ModifiedBy"": ""System Administrator"", 
      ""Archived"": false 
     } 
     ] 
    } 
    } 
} 
} 
]"; 
     dynamic data = System.Web.Helpers.Json.Decode("{" + json + "}"); 

     var result = from i in (IEnumerable<dynamic>)data.Items 
        where i.Result.ServiceAgreement.AdditionalItems.ScheduleBased == true 
        select new 
          { 
           i.Result.Client.Name, 
           i.Result.Client.Id 
          }; 

     Assert.AreEqual(1, result.Count()); 
     Assert.AreEqual("client Name", result.First().Name); 
     Assert.AreEqual("35ea10da-b8d5-4ef8-bf23-c829ae90fe60", result.First().Id); 
    }

注意，我不得不加上括號{和}包圍你的例子JSON字符串，否則.NET json解析器不喜歡它。

來源

2012-09-17 12:18:11 CodingWithSpike

我已經稍微修改了我的PayCycle集合，只返回集合中的1個項目。例如，我爲了獲得SelfBilling屬性，我在where子句中完成了以下內容：where（bool）p [「Result」] [「ServiceAgreement」] [「AdditionalItems」] [「PayCycle」] [0] [「SelfBilling」] == false。這給了我正在尋找的結果。 – KDee

首先，我不熟悉使用這種格式編寫LINQ/LAMBDA [「some」] [「thing」]。我的第一步是創建一些類/對象來存放數據，以便隨後創建任何代碼。

例如

public class Result 
{ 
    public Guid Id { get; set; } 
    public string Name { get; set; }, 
    public DateTime StartDate { get; set; } 
    //you get the idea 
}

但可能試試以下？

var result = from p in data["Data"]["Items"].Children() 
       where (bool)p["Result"]["ServiceAgreement"]["AdditionalItems"]["ScheduleBased"] == true 
        && (p["Result"]["ServiceAgreement"]["AdditionalItems"]["PayCycle"]).Where(o => o.["ScheduleBased"] == true) 
       select new 
       { 
        Name = (string)p["Result"]["Client"]["Name"], 
        Id = (string)p["Result"]["Client"]["Id"] 
       };

來源

2012-09-17 11:45:29

使用LINQ查詢JSON

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