Json.NET使用入门(六)【LINQ to JSON】

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@H_403_1@手动创建JSON

本示例以编程方式一次创建JObject和JArray实例。

JArray array = new JArray();
            array.Add("Manual text");
            array.Add(new DateTime(2000,5,23));

            JObject o = new JObject();
            o["MyArray"] = array;

            string json = o.ToString();
            // {
            // "MyArray": [
            // "Manual text",
            // "2000-05-23T00:00:00"
            // ]
            // }

使用集合初始化器创建JSON

JObject o = new JObject
            {
                 { "cpu","Intel" },{ "Memory",32 },{
                   "Drives",new JArray
                   {
                            "DVD","SSD"
                    }
                 }
            };
            Console.WriteLine(o.ToString());

            // {
            // "cpu": "Intel",
            // "Memory": 32,
            // "Drives": [
            // "DVD",
            // "SSD"
            // ]
            // }

用LINQ声明创建JSON

public class Post
{
    public string Title { get; set; }
    public string Description { get; set; }
    public string Link { get; set; }
    public IList<string> Categories { get; set; }
}
List<Post> posts = GetPosts();

JObject RSS =
    new JObject(
        new JProperty("channel",new JObject(
                new JProperty("title","James Newton-King"),new JProperty("link","http://james.newtonking.com"),new JProperty("description","James Newton-King's blog."),new JProperty("item",new JArray(
                        from p in posts
                        orderby p.Title
                        select new JObject(
                            new JProperty("title",p.Title),p.Description),p.Link),new JProperty("category",new JArray(
                                    from c in p.Categories
                                    select new JValue(c)))))))));

Console.WriteLine(RSS.ToString());

// {
// "channel": {
// "title": "James Newton-King",
// "link": "http://james.newtonking.com",
// "description": "James Newton-King's blog.",
// "item": [
// {
// "title": "Json.NET 1.3 + New license + Now on CodePlex",
// "description": "Annoucing the release of Json.NET 1.3,the MIT license and being available on CodePlex",
// "link": "http://james.newtonking.com/projects/json-net.aspx",
// "category": [
// "Json.NET",
// "CodePlex"
// ]
// },
// {
// "title": "LINQ to JSON beta",
// "description": "Annoucing LINQ to JSON",
// "LINQ"
// ]
// }
// ]
// }
// }

动态创建JSON

本示例使用C#动态功能创建JObject和JArray实例。

dynamic product = new JObject();
product.ProductName = "Elbow Grease";
product.Enabled = true;
product.Price = 4.90m;
product.StockCount = 9000;
product.StockValue = 44100;
product.Tags = new JArray("Real","OnSale");

Console.WriteLine(product.ToString());
// {
//   "ProductName": "Elbow Grease",//   "Enabled": true,//   "Price": 4.90,//   "StockCount": 9000,//   "StockValue": 44100,//   "Tags": [
//     "Real",//     "OnSale"
//   ]
// }

使用JTokenWriter创建JSON

JTokenWriter writer = new JTokenWriter();
writer.WriteStartObject();
writer.WritePropertyName("name1");
writer.WriteValue("value1");
writer.WritePropertyName("name2");
writer.WriteStartArray();
writer.WriteValue(1);
writer.WriteValue(2);
writer.WriteEndArray();
writer.WriteEndObject();

JObject o = (JObject)writer.Token;

Console.WriteLine(o.ToString());
// {
//   "name1": "value1",//   "name2": [
//     1,//     2
//   ]
// }

从对象创建JSON

这个示例使用JToken.FromObject(Object)将.NET值转换为LINQ to JSON

public class Computer
{
    public string cpu { get; set; }
    public int Memory { get; set; }
    public IList<string> Drives { get; set; }
}
JValue i = (JValue)JToken.FromObject(12345);

Console.WriteLine(i.Type);
// Integer
Console.WriteLine(i.ToString());
// 12345

JValue s = (JValue)JToken.FromObject("A string");

Console.WriteLine(s.Type);
// String
Console.WriteLine(s.ToString());
// A string

Computer computer = new Computer
{
    cpu = "Intel",Memory = 32,Drives = new List<string>
    {
        "DVD","SSD"
    }
};

JObject o = (JObject)JToken.FromObject(computer);

Console.WriteLine(o.ToString());
// {
//   "cpu": "Intel",//   "Memory": 32,//   "Drives": [
//     "DVD",//     "SSD"
//   ]
// }

JArray a = (JArray)JToken.FromObject(computer.Drives);

Console.WriteLine(a.ToString());
// [
//   "DVD",//   "SSD"
// ]

从匿名类型创建JSON

public class Post
{
    public string Title { get; set; }
    public string Description { get; set; }
    public string Link { get; set; }
    public IList<string> Categories { get; set; }
}
List<Post> posts = new List<Post>
{
    new Post
    {
        Title = "Episode VII",Description = "Episode VII production",Categories = new List<string>
        {
            "episode-vii","movie"
        },Link = "episode-vii-production.aspx"
    }
};

JObject o = JObject.FromObject(new
{
    channel = new
    {
        title = "Star Wars",link = "http://www.starwars.com",description = "Star Wars blog.",item =
            from p in posts
            orderby p.Title
            select new
            {
                title = p.Title,description = p.Description,link = p.Link,category = p.Categories
            }
    }
});

Console.WriteLine(o.ToString());
// {
// "channel": {
// "title": "Star Wars",
// "link": "http://www.starwars.com",
// "description": "Star Wars blog.",
// "item": [
// {
// "title": "Episode VII",
// "description": "Episode VII production",
// "link": "episode-vii-production.aspx",
// "category": [
// "episode-vii",
// "movie"
// ]
// }
// ]
// }
// }

使用JArray.Parse解析JSON数组

string json = @"[ 'Small','Medium','Large' ]";

JArray a = JArray.Parse(json);

Console.WriteLine(a.ToString());
// [
//   "Small",//   "Medium",//   "Large"
// ]

使用JObject.Parse解析JSON对象

string json = @"{ cpu: 'Intel',Drives: [ 'DVD read/writer','500 gigabyte hard drive' ] }";

JObject o = JObject.Parse(json);

Console.WriteLine(o.ToString());
// {
// "cpu": "Intel",
// "Drives": [
// "DVD read/writer",
// "500 gigabyte hard drive"
// ]
// }

使用JToken.Parse解析所有的JSON

JToken t1 = JToken.Parse("{}");

Console.WriteLine(t1.Type);
// Object

JToken t2 = JToken.Parse("[]");

Console.WriteLine(t2.Type);
// Array

JToken t3 = JToken.Parse("null");

Console.WriteLine(t3.Type);
// Null

JToken t4 = JToken.Parse(@"'A string!'");

Console.WriteLine(t4.Type);
// String

使用LINQ从JSON反序列化

public class BlogPost
{
    public string Title { get; set; }
    public string AuthorName { get; set; }
    public string AuthorTwitter { get; set; }
    public string Body { get; set; }
    public DateTime PostedDate { get; set; }
}
string json = @"[
  {
    'Title': 'Json.NET is awesome!','Author': {
      'Name': 'James Newton-King','Twitter': '@JamesNK','Picture': '/jamesnk.png'
    },'Date': '2013-01-23T19:30:00','BodyHtml': '&lt;h3&gt;Title!&lt;/h3&gt;\r\n&lt;p&gt;Content!&lt;/p&gt;'
  }
]"; JArray blogPostArray = JArray.Parse(json); IList<BlogPost> blogPosts = blogPostArray.Select(p => new BlogPost { Title = (string)p["Title"],AuthorName = (string)p["Author"]["Name"],AuthorTwitter = (string)p["Author"]["Twitter"],PostedDate = (DateTime)p["Date"],Body = HttpUtility.HtmlDecode((string)p["BodyHtml"]) }).ToList(); Console.WriteLine(blogPosts[0].Body); // <h3>Title!</h3> // <p>Content!</p>

使用LINQ序列化为JSON

本示例使用LINQ to JSON手动将.NET类型转换为JSON

public class BlogPost
{
    public string Title { get; set; }
    public string AuthorName { get; set; }
    public string AuthorTwitter { get; set; }
    public string Body { get; set; }
    public DateTime PostedDate { get; set; }
}
IList<BlogPost> blogPosts = new List<BlogPost>
{
    new BlogPost
    {
        Title = "Json.NET is awesome!",AuthorName = "James Newton-King",AuthorTwitter = "JamesNK",PostedDate = new DateTime(2013,1,23,19,30,0),Body = @"<h3>Title!</h3> <p>Content!</p>"
    }
};

JArray blogPostsArray = new JArray(
    blogPosts.Select(p => new JObject
    {
        { "Title",p.Title },{
            "Author",new JObject
            {
                { "Name",p.AuthorName },{ "Twitter",p.AuthorTwitter }
            }
        },{ "Date",p.PostedDate },{ "BodyHtml",HttpUtility.HtmlEncode(p.Body) },})
    );

Console.WriteLine(blogPostsArray.ToString());
// [
// {
// "Title": "Json.NET is awesome!",
// "Author": {
// "Name": "James Newton-King",
// "Twitter": "JamesNK"
// },
// "Date": "2013-01-23T19:30:00",
// "BodyHtml": "&lt;h3&gt;Title!&lt;/h3&gt;\r\n&lt;p&gt;Content!&lt;/p&gt;"
// }
// ]

修改JSON

此示例加载JSON，修改JObject和JArray实例，然后再次写出JSON

string json = @"{ 'channel': {
    'title': 'Star Wars','link': 'http://www.starwars.com','description': 'Star Wars blog.','obsolete': 'Obsolete value','item': []
  }
}"; JObject RSS = JObject.Parse(json); JObject channel = (JObject)RSS["channel"]; channel["title"] = ((string)channel["title"]).ToUpper(); channel["description"] = ((string)channel["description"]).ToUpper(); channel.Property("obsolete").Remove(); channel.Property("description").AddAfterSelf(new JProperty("new","New value")); JArray item = (JArray)channel["item"]; item.Add("Item 1"); item.Add("Item 2"); Console.WriteLine(RSS.ToString()); // { // "channel": { // "title": "STAR WARS",// "link": "http://www.starwars.com",
// "description": "STAR WARS BLOG.",
// "new": "New value",
// "item": [
// "Item 1",
// "Item 2"
// ]
// }
// }

合并JSON

此示例将LINQ to JSON对象合并

JObject o1 = JObject.Parse(@"{ 'FirstName': 'John','LastName': 'Smith','Enabled': false,'Roles': [ 'User' ]
}"); JObject o2 = JObject.Parse(@"{
  'Enabled': true,'Roles': [ 'User','Admin' ]
}"); o1.Merge(o2,new JsonMergeSettings { // union array values together to avoid duplicates MergeArrayHandling = MergeArrayHandling.Union }); string json = o1.ToString(); // { // "FirstName": "John",// "LastName": "Smith",// "Enabled": true,// "Roles": [ // "User",// "Admin" // ] // }

查询JSON

此示例加载JSON，然后使用Item[Object] 索引器从其中查询值，然后将返回的标记转换为.NET值

string json = @"{
  'channel': {
    'title': 'James Newton-King','link': 'http://james.newtonking.com','description': 'James Newton-King\'s blog.','item': [
      {
        'title': 'Json.NET 1.3 + New license + Now on CodePlex','description': 'Annoucing the release of Json.NET 1.3,the MIT license and the source on CodePlex','link': 'http://james.newtonking.com/projects/json-net.aspx','category': [
          'Json.NET','CodePlex'
        ]
      },{
        'title': 'LINQ to JSON beta','description': 'Annoucing LINQ to JSON','LINQ'
        ]
      }
    ]
  }
}"; JObject RSS = JObject.Parse(json); string RSSTitle = (string)RSS["channel"]["title"]; Console.WriteLine(RSSTitle); // James Newton-King string itemTitle = (string)RSS["channel"]["item"][0]["title"]; Console.WriteLine(itemTitle); // Json.NET 1.3 + New license + Now on CodePlex JArray categories = (JArray)RSS["channel"]["item"][0]["category"]; Console.WriteLine(categories); // [ // "Json.NET",// "CodePlex" // ] string[] categoriesText = categories.Select(c => (string)c).ToArray(); Console.WriteLine(string.Join(",",categoriesText)); // Json.NET,CodePlex

用动态查询JSON

此示例加载JSON，然后使用C#动态功能从中查询值

string json = @"[
  {
    'Title': 'Json.NET is awesome!','BodyHtml': '&lt;h3&gt;Title!&lt;/h3&gt;\r\n&lt;p&gt;Content!&lt;/p&gt;'
  }
]"; dynamic blogPosts = JArray.Parse(json); dynamic blogPost = blogPosts[0]; string title = blogPost.Title; Console.WriteLine(title); // Json.NET is awesome! string author = blogPost.Author.Name; Console.WriteLine(author); // James Newton-King DateTime postDate = blogPost.Date; Console.WriteLine(postDate); // 23/01/2013 7:30:00 p.m.

用LINQ查询JSON

string json = @"{ 'channel': { 'title': 'James Newton-King','link': 'http://james.newtonking.com','description': 'James Newton-King\'s blog.','item': [ { 'title': 'Json.NET 1.3 + New license + Now on CodePlex','description': 'Annoucing the release of Json.NET 1.3,the MIT license and the source on CodePlex','link': 'http://james.newtonking.com/projects/json-net.aspx','category': [ 'Json.NET','CodePlex' ] },{ 'title': 'LINQ to JSON beta','description': 'Annoucing LINQ to JSON','LINQ' ] } ] } }";

JObject RSS = JObject.Parse(json);

var postTitles =
    from p in RSS["channel"]["item"]
    select (string)p["title"];

foreach (var item in postTitles)
{
    Console.WriteLine(item);
}
//LINQ to JSON beta
//Json.NET 1.3 + New license + Now on CodePlex

var categories =
    from c in RSS["channel"]["item"].Children()["category"].Values<string>()
    group c by c
    into g
    orderby g.Count() descending
    select new { Category = g.Key,Count = g.Count() };

foreach (var c in categories)
{
    Console.WriteLine(c.Category + " - Count: " + c.Count);
}
//Json.NET - Count: 2
//LINQ - Count: 1
//CodePlex - Count: 1

用SelectToken查询JSON

此示例加载JSON，然后使用 SelectToken(String)从它查询值。

JObject o = JObject.Parse(@"{
  'Stores': [
    'Lambton Quay','Willis Street'
  ],'Manufacturers': [
    {
      'Name': 'Acme Co','Products': [
        {
          'Name': 'Anvil','Price': 50
        }
      ]
    },{
      'Name': 'Contoso','Products': [
        {
          'Name': 'Elbow Grease','Price': 99.95
        },{
          'Name': 'Headlight Fluid','Price': 4
        }
      ]
    }
  ]
}"); string name = (string)o.SelectToken("Manufacturers[0].Name"); Console.WriteLine(name); // Acme Co decimal productPrice = (decimal)o.SelectToken("Manufacturers[0].Products[0].Price"); Console.WriteLine(productPrice); // 50 string productName = (string)o.SelectToken("Manufacturers[1].Products[0].Name"); Console.WriteLine(productName); // Elbow Grease

用SelectToken查询JSON并转义属性

此示例加载JSON时需要使用 SelectToken(String)查询时需要转义的属性

JObject o = JObject.Parse(@"{ 'Space Invaders': 'Taito','Doom ]|[': 'id',""Yar's Revenge"": 'Atari','Government ""Intelligence""': 'Make-Believe' }");

string spaceInvaders = (string)o.SelectToken("['Space Invaders']");
// Taito

string doom3 = (string)o.SelectToken("['Doom ]|[']");
// id

string yarsRevenge = (string)o.SelectToken("['Yar\\'s Revenge']");
// Atari

string governmentIntelligence = (string)o.SelectToken("['Government \"Intelligence\"']");
// Make-Believe

用SelectToken和LINQ查询JSON

此示例加载JSON，然后使用SelectToken(String)和LINQ运算符的组合来从中查询值。

JObject o = JObject.Parse(@"{
  'Stores': [
    'Lambton Quay','Price': 4
        }
      ]
    }
  ]
}"); string[] storeNames = o.SelectToken("Stores").Select(s => (string)s).ToArray(); Console.WriteLine(string.Join(",storeNames)); // Lambton Quay,Willis Street string[] firstProductNames = o["Manufacturers"].Select(m => (string)m.SelectToken("Products[1].Name")) .Where(n => n != null).ToArray(); Console.WriteLine(string.Join(",firstProductNames)); // Headlight Fluid decimal totalPrice = o["Manufacturers"].Sum(m => (decimal)m.SelectToken("Products[0].Price")); Console.WriteLine(totalPrice); // 149.95

用JSONPath查询JSON

此示例加载JSON，然后使用带有JSONPath查询的SelectToken(String)从其中查询值。

JObject o = JObject.Parse(@"{
  'Stores': [
    'Lambton Quay','Price': 4
        }
      ]
    }
  ]
}"); // manufacturer with the name 'Acme Co' JToken acme = o.SelectToken("$.Manufacturers[?(@.Name == 'Acme Co')]"); Console.WriteLine(acme); // { "Name": "Acme Co",Products: [{ "Name": "Anvil","Price": 50 }] } // name of all products priced 50 and above IEnumerable<JToken> pricyProducts = o.SelectTokens("$..Products[?(@.Price >= 50)].Name"); foreach (JToken item in pricyProducts) { Console.WriteLine(item); } // Anvil // Elbow Grease

从文件中读取JSON

JObject o1 = JObject.Parse(File.ReadAllText(@"c:\videogames.json"));

// read JSON directly from a file
using (StreamReader file = File.OpenText(@"c:\videogames.json"))
using (JsonTextReader reader = new JsonTextReader(file))
{
    JObject o2 = (JObject)JToken.ReadFrom(reader);
}

将JSON写入一个文件

JObject videogameRatings = new JObject(
    new JProperty("Halo",9),new JProperty("Starcraft",new JProperty("Call of Duty",7.5));

File.WriteAllText(@"c:\videogames.json",videogameRatings.ToString());

// write JSON directly to a file
using (StreamWriter file = File.CreateText(@"c:\videogames.json"))
using (JsonTextWriter writer = new JsonTextWriter(file))
{
    videogameRatings.WriteTo(writer);
}

将JSON转换为集合

此示例使用ToObject<T>()将LINQ to JSON对象转换为.NET类型

string json = @"{
  'd': [
    {
      'Name': 'John Smith'
    },{
      'Name': 'Mike Smith'
    }
  ]
}"; JObject o = JObject.Parse(json); JArray a = (JArray)o["d"]; IList<Person> person = a.ToObject<IList<Person>>(); Console.WriteLine(person[0].Name); // John Smith Console.WriteLine(person[1].Name); // Mike Smith

将JSON转换为值

此示例使用ToObject<T>()将LINQ to JSON对象转换为.NET类型

JValue v1 = new JValue(true);

bool b = v1.ToObject<bool>();

Console.WriteLine(b);
// true

int i = v1.ToObject<int>();

Console.WriteLine(i);
// 1

string s = v1.ToObject<string>();

Console.WriteLine(s);
// "True"

将JSON转换为类型

此示例使用 ToObject(Type)将LINQ to JSON对象转换为.NET类型

JValue v1 = new JValue(true);

bool b = (bool)v1.ToObject(typeof(bool));

Console.WriteLine(b);
// true

int i = (int)v1.ToObject(typeof(int));

Console.WriteLine(i);
// 1

string s = (string)v1.ToObject(typeof(string));

Console.WriteLine(s);
// "True"

转换JValue

此示例将JValue实例转换为.NET值

JValue v1 = new JValue("1");
int i = (int)v1;

Console.WriteLine(i);
// 1

JValue v2 = new JValue(true);
bool b = (bool)v2;

Console.WriteLine(b);
// true

JValue v3 = new JValue("19.95");
decimal d = (decimal)v3;

Console.WriteLine(d);
// 19.95

JValue v4 = new JValue(new DateTime(2013,21));
string s = (string)v4;

Console.WriteLine(s);
// 01/21/2013 00:00:00

JValue v5 = new JValue("http://www.bing.com");
Uri u = (Uri)v5;

Console.WriteLine(u);
// http://www.bing.com/

JValue v6 = JValue.CreateNull();
u = (Uri)v6;

Console.WriteLine((u != null) ? u.ToString() : "{null}");
// {null}

DateTime? dt = (DateTime?)v6;

Console.WriteLine((dt != null) ? dt.ToString() : "{null}");
// {null}

使用JValue.Value

JValue s = new JValue("A string value");

Console.WriteLine(s.Value.GetType().Name);
// String
Console.WriteLine(s.Value);
// A string value

JValue u = new JValue(new Uri("http://www.google.com/"));

Console.WriteLine(u.Value.GetType().Name);
// Uri
Console.WriteLine(u.Value);
// http://www.google.com/

使用JObject.Properties

此示例使用Properties()获取对象的JProperty集合

JObject o = new JObject
{
    { "name1","value1" },{ "name2","value2" }
};

foreach (JProperty property in o.Properties())
{
    Console.WriteLine(property.Name + " - " + property.Value);
}
// name1 - value1
// name2 - value2

foreach (KeyValuePair<string,JToken> property in o)
{
    Console.WriteLine(property.Key + " - " + property.Value);
}
// name1 - value1
// name2 - value2

使用LINQ to JSON注解

本示例使用LINQ to JSON对象的注释

JObject o = JObject.Parse(@"{ 'name': 'Bill G','age': 58,'country': 'United States','employer': 'Microsoft' }");

o.AddAnnotation(new HashSet<string>());
o.PropertyChanged += (sender,args) => o.Annotation<HashSet<string>>().Add(args.PropertyName);

o["age"] = 59;
o["employer"] = "Bill & Melinda Gates Foundation";

HashSet<string> changedProperties = o.Annotation<HashSet<string>>();
// age
// employer

比较JSON和JToken.DeepEquals

此示例使用DeepEquals(JToken,JToken)比较JToken实例,比较令牌和所有子令牌

JValue s1 = new JValue("A string");
JValue s2 = new JValue("A string");
JValue s3 = new JValue("A STRING");

Console.WriteLine(JToken.DeepEquals(s1,s2));
// true

Console.WriteLine(JToken.DeepEquals(s2,s3));
// false

JObject o1 = new JObject
{
    { "Integer",12345 },{ "String","A string" },{ "Items",new JArray(1,2) }
};

JObject o2 = new JObject
{
    { "Integer",2) }
};

Console.WriteLine(JToken.DeepEquals(o1,o2));
// true

Console.WriteLine(JToken.DeepEquals(s1,o1["String"]));
// true

使用JToken.DeepClone克隆JSON

此示例使用 DeepClone()递归地克隆一个JToken及其所有子项

JObject o1 = new JObject
{
    { "String","A string!" },2) }
};

Console.WriteLine(o1.ToString());
// {
// "String": "A string!",
// "Items": [
// 1,
// 2
// ]
// }

JObject o2 = (JObject)o1.DeepClone();

Console.WriteLine(o2.ToString());
// {
// "String": "A string!",
// 2
// ]
// }

Console.WriteLine(JToken.DeepEquals(o1,o2));
// true

Console.WriteLine(Object.ReferenceEquals(o1,o2));
// false

用JToken.ToString写JSON文本

本示例将LINQ to JSON对象转换为JSON

JObject o = JObject.Parse(@"{'string1':'value','integer2':99,'datetime3':'2000-05-23T00:00:00'}");

Console.WriteLine(o.ToString());
// {
//   "string1": "value",//   "integer2": 99,//   "datetime3": "2000-05-23T00:00:00"
// }

Console.WriteLine(o.ToString(Formatting.None));
// {"string1":"value","integer2":99,"datetime3":"2000-05-23T00:00:00"}

Console.WriteLine(o.ToString(Formatting.None,new JavaScriptDateTimeConverter()));
// {"string1":"value","datetime3":new Date(959032800000)}

与JsonConverter一起使用JToken.ToString

本示例使用JsonConverter来自定义将LINQ to JSON对象转换为JSON

JObject o = JObject.Parse(@"{'string1':'value','integer2':99,'datetime3':'2000-05-23T00:00:00'}"); Console.WriteLine(o.ToString(Formatting.None,new JavaScriptDateTimeConverter())); // {"string1":"value","integer2":99,"datetime3":new Date(959032800000)}

使用JToken.CreateReader

本示例从JToken创建一个JTokenReader

JObject o = new JObject
{
    { "cpu",{
        "Drives",new JArray
        {
            "DVD","SSD"
        }
    }
};

JsonReader reader = o.CreateReader();
while (reader.Read())
{
    Console.Write(reader.TokenType);
    if (reader.Value != null)
    {
        Console.Write(" - " + reader.Value);
    }

    Console.WriteLine();
}

// StartObject
// PropertyName - cpu
// String - Intel
// PropertyName - Memory
// Integer - 32
// PropertyName - Drives
// StartArray
// String - DVD
// String - SSD
// EndArray
// EndObject

使用JToken.CreateWriter

本示例从JToken创建一个JTokenWriter

JObject o = new JObject
{
    { "name1","value2" }
};

JsonWriter writer = o.CreateWriter();
writer.WritePropertyName("name3");
writer.WriteStartArray();
writer.WriteValue(1);
writer.WriteValue(2);
writer.WriteEndArray();

Console.WriteLine(o.ToString());
// {
//   "name1": "value1",//   "name2": "value2",//   "name3": [
//     1,//     2
//   ]
// }

从BSON读取

本示例使用BsonReader从BSON读取JObject

byte[] data = Convert.FromBase64String("KQAAAAJuYW1lMQAHAAAAdmFsdWUxAAJuYW1lMgAHAAAAdmFsdWUyAAA=");
MemoryStream ms = new MemoryStream(data);

JObject o;
using (BsonReader reader = new BsonReader(ms))
{
    o = (JObject)JToken.ReadFrom(reader);
}

string value = (string)o["name1"];

Console.WriteLine(value);
// value1

写为BSON

本示例使用BsonWriter将JObject写入BSON

JObject o = new JObject
{
    { "name1","value2" }
};

MemoryStream ms = new MemoryStream();
using (BsonWriter writer = new BsonWriter(ms))
{
    o.WriteTo(writer);
}

string data = Convert.ToBase64String(ms.ToArray());

Console.WriteLine(data);
// KQAAAAJuYW1lMQAHAAAAdmFsdWUxAAJuYW1lMgAHAAAAdmFsdWUyAAA=

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