如何根据C＃中的条件删除一组Json对象？

Question

我有持有像数据的JSON文件：

[ 
    { 
    "applicationName": "ABC", 
    "machineName": "XYZ", 
    "OrderNumber": "N46464646" 
    }, 
    { 
    "applicationName": "DEF", 
    "machineName": "XYZ", 
    "OrderNumber": "D46364636" 
    }, 
    { 
    "applicationName": "ABC", 
    "machineName": "XYZ", 
    "OrderNumber": "D34343434" 
    } 
] 

我想从基于订单编号例如上述数据中移除一组对象的：如果我给订单编号“D46364636”，它应该删除 -

{ 
    "applicationName": "DEF", 
    "machineName": "XYZ", 
    "OrderNumber": "D46364636" 
} 

我已经尝试过做这样这个 -

JsonDataList = new List<JsonItem>(); 
       string input = ""; 
       string inputApplicationName = ""; 
       string inputMachineName = ""; 
       string inputOrderNum = ""; 
       while (input != "q") 
       { 
        Console.WriteLine("Press 'd' to Delete item"); 
        Console.WriteLine("Press 'q' to Quit Program"); 
        Console.WriteLine("Press Command:"); 
        input = Console.ReadLine(); 
        switch (input) 
        { 
         case "d": 
          Console.WriteLine("Enter Order Number to remove:"); 
          inputOrderNum = Console.ReadLine(); 
          var js = File.ReadAllText(@"C:\Users\ab54253\Documents\visual studio 2010\Projects\JSONExample\JSONExample\JsonData\AutomatedJson.json"); 
          var result=JsonConvert.DeserializeObject<List<JsonData>>(js); 
          foreach(var item in result) 
          { 
           if(item.OrderNumber==inputOrderNum) 
           { 
            JsonDataList.Remove(new JsonItem(item.applicationName, item.machineName, item.OrderNumber)); 
           } 
          } 
          break; 
         case "q": 
          Console.WriteLine("Quit Program"); 
          break; 
         default: 
          Console.WriteLine("Incorrect Command, Try Again"); 
          break; 
        } 
       } 
       Console.WriteLine("Rewriting AutomatedJson.json"); 
       string JD = JsonConvert.SerializeObject(JsonDataList, Newtonsoft.Json.Formatting.Indented); 
       File.WriteAllText(@"C:\Users\ab54253\Documents\visual studio 2010\Projects\JSONExample\JSONExample\JsonData\AutomatedJson.json", JD); 
       Console.ReadLine(); 

我能够检查与条件，我曾经用删除的数据：

if(item.OrderNumber==inputOrderNum) 
{ 
    JsonDataList.Remove(new JsonItem(item.applicationName, item.machineName, item.OrderNumber)); 
} 

通过使用上面的一段代码，它将从JSON文件中删除所有数据，而不是删除所需的数据。请指导我。

Answer 1

您可以使用将字符串反序列化为对象。然后使用Linq选择想要的项目，然后再次使用Json.NET来获取JSON字符串。

public class Item 
    { 
     public string applicationName {get; set;} 
     public string machineName {get;set;} 
     public string OrderNumber {get; set;} 
    } 

var items = JsonConvert.DeserializeObject<List<Item>>(JsonString); 

var newJsonString = JsonConvert.SerializeObject(items.Where(i => i.OrderNumber != "D46364636"));