使用 C# 的复杂 JSON 对象序列化

Posted 2023-03-31

【中文标题】使用 C# 的复杂 JSON 对象序列化

【英文标题】：Complex JSON object Serialization using C#

【发布时间】：2016-05-28 20:16:08

【问题描述】：

我正在尝试使用 C# 序列化复杂的 JSON 对象。我通过我的代码得到了一个初始输出。但是我想在我的序列化 json 之前以数组形式添加另一个对象。我以这种方式从我的 json 对象创建了 C# 类-

 public class GeoCoordinates
  
    public double Longitude  get; set; 
    public double Latitude  get; set; 
 

public class Tourist

  public string Name  get; set; 
  public string Shorttext  get; set; 
  public GeoCoordinates GeoCoordinates  get; set; 
  public List<string> Images  get; set; 

public class City

  public List<Tourist> Tourist  get; set; 

public class RootObject

   public List<City> city  get; set; 

我获取所有存储的 .json 文件然后序列化的代码是-

 static void Main(string[] args)
    
        var startPath = Application.StartupPath;
        var city = new City  Tourist = new List<Tourist>() ;
        DirectoryInfo d = new DirectoryInfo(startPath+@"\Flensburg\");
        foreach (var file in d.GetFiles())
        
          using (StreamReader fi = File.OpenText(file.FullName))
          
            JsonSerializer serializer = new JsonSerializer();
            Tourist tourist = (Tourist)serializer.Deserialize(fi, typeof(Tourist));
            city.Tourist.Add(tourist);
         

        

        using (StreamWriter file = File.CreateText(@"C:\C# tutorial Backup\joint_josn\joint_josn\bin\Debug\cities.json"))
        
            JsonSerializer serializer = new JsonSerializer  Formatting = Formatting.Indented ;
            serializer.Serialize(file, city);

        

     

但是在运行代码之后，我以这种方式获得了输出-

   
   "Tourist": [
    
     "Name": "Flensburg Firth",
     "Shorttext": "Flensburg Firth or Flensborg Fjord  is the westernmost inlet of the Baltic Sea. It forms part of the border between Germany to the south and Denmark to the north. Its length is either 40 or 50 km, depending to the definition of its limits. It has the largest surface of all Förden and East Jutland Fjorde, which are a special type of inlets, different from geological fjords.\nTwo peninsulas, Broager peninsula on the northern side and Holnis peninsula on the southern side divide the inlet in an outer and an inner part. West of them, near the Danish coast, there are two small Islands called Okseøer.\nOn the Danish side, outer part of the northern limits of the firth is formed by the island of Als with the town of Sønderborg. Towards the west, continuing on the Danish side are Broager, Egernsund, Gråsten, Rinkenæs, Sønderhav, and Kollund.\nIn Germany at the Danish border there is Harrislee, at the inner end of the inlet the town of Flensburg, east of it on the southern shore the town of Glücksburg and the villages Munkbrarup, Langballig, Westerholz, Quern, Steinberg, Niesgrau, Gelting, and Nieby.\n\n",
    "GeoCoordinates": 
    "Longitude": 9.42901993,
    "Latitude": 54.7959404
  ,
    "Images": [
    "CE3222F5.jpg"
   ]
  ,
   
    "Name": "Naval Academy Mürwik",
    "Shorttext": "The Naval Academy Mürwik is the main training establishment for all German Navy officers and replaced the German Imperial Naval Academy in Kiel.\nIt is located at Mürwik which is a part of Germany's most northern city, Flensburg. Built on a small hill directly by the coast, it overlooks the Flensburg Fjord. The main building of the academy is known for its beautiful architecture and location, and is often named the \"Red Castle\".\n\n",
    "GeoCoordinates": 
    "Longitude": 9.45944444,
     "Latitude": 54.815
    ,
    "Images": [
    "34AADEDE.jpg"
   ]
   ,
  
  "Name": "Nordertor",
  "Shorttext": "The Nordertor is an old town gate in Flensburg, Germany, which was built around 1595. Today the landmark is used as a symbol for Flensburg.\n\n",
  "GeoCoordinates": 
  "Longitude": 9.43004861,
  "Latitude": 54.79541778
   ,
   "Images": [
   "D02DCA3E.jpg"
    ]
   
 ]

但我也想在这个 json 之前添加“City”并保持它的数组形式。我的预期结果是-

  
  "City": [

    
      "Tourist": [
         
            "Name": "Flensburg Firth",
            "Shorttext": "Flensburg Firth or Flensborg Fjord  is the westernmost inlet of the Baltic Sea. It forms part of the border between Germany to the south and Denmark to the north. Its length is either 40 or 50 km, depending to the definition of its limits. It has the largest surface of all Förden and East Jutland Fjorde, which are a special type of inlets, different from geological fjords.\nTwo peninsulas, Broager peninsula on the northern side and Holnis peninsula on the southern side divide the inlet in an outer and an inner part. West of them, near the Danish coast, there are two small Islands called Okseøer.\nOn the Danish side, outer part of the northern limits of the firth is formed by the island of Als with the town of Sønderborg. Towards the west, continuing on the Danish side are Broager, Egernsund, Gråsten, Rinkenæs, Sønderhav, and Kollund.\nIn Germany at the Danish border there is Harrislee, at the inner end of the inlet the town of Flensburg, east of it on the southern shore the town of Glücksburg and the villages Munkbrarup, Langballig, Westerholz, Quern, Steinberg, Niesgrau, Gelting, and Nieby.\n\n",
            "GeoCoordinates": 
                "Longitude": 9.42901993,
                "Latitude": 54.7959404
            ,
            "Images": [
                "CE3222F5.jpg"
            ]
         ,
         
            "Name": "Naval Academy Mürwik",
            "Shorttext": "The Naval Academy Mürwik is the main training establishment for all German Navy officers and replaced the German Imperial Naval Academy in Kiel.\nIt is located at Mürwik which is a part of Germany's most northern city, Flensburg. Built on a small hill directly by the coast, it overlooks the Flensburg Fjord. The main building of the academy is known for its beautiful architecture and location, and is often named the \"Red Castle\".\n\n",
            "GeoCoordinates": 
                "Longitude": 9.45944444,
                "Latitude": 54.815
            ,
            "Images": [
                "34AADEDE.jpg"
            ]
         ,
         
            "Name": "Nordertor",
            "Shorttext": "The Nordertor is an old town gate in Flensburg, Germany, which was built around 1595. Today the landmark is used as a symbol for Flensburg.\n\n",
            "GeoCoordinates": 
                "Longitude": 9.43004861,
                "Latitude": 54.79541778
            ,
            "Images": [
                "D02DCA3E.jpg"
             ]
           
         ]
      

    ]

  

我正在尝试但无法得到我的结果。我知道我还需要反序列化 RootObject。但是在这里不知道怎么做。我想知道我应该在我的代码中修改什么来获得这个结果。

【参考方案1】：

您没有在代码中写出 RootObject。 此外，您只写出一个城市而不是城市列表

    using (StreamWriter file = File.CreateText(@"C:\C# tutorial Backup\joint_josn\joint_josn\bin\Debug\cities.json"))
    
        JsonSerializer serializer = new JsonSerializer  Formatting = Formatting.Indented ;
        serializer.Serialize(file, city);

    

这样做可以解决问题

    using (StreamWriter file = File.CreateText(@"C:\C# tutorial Backup\joint_josn\joint_josn\bin\Debug\cities.json"))
    
        JsonSerializer serializer = new JsonSerializer  Formatting = Formatting.Indented ;
        serializer.Serialize(file, new RootObject  city = new List<City>  city   );

    

基本上，我们编写一个根对象，以便您获得“城市”JSON 字段，此外，我们编写一个城市列表，以便您获得 JSON 格式的城市数组。

更改“RootObject”类中“city”字段名称的大小写以获得正确的 JSON 值。或者，您也可以在字段上使用 JsonProperty 属性来指定与您的字段名称不同的名称。

例如

public class RootObject

   [JsonProperty("MyCityName")]
   public List<City> city  get; set; 

【讨论】：

请在 city 行之后添加一个额外的 。它显示错误。我修好了。