C# 解析JSON方法总结

Posted 2020-08-16 mimime

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http://blog.csdn.net/jjhua/article/details/51438317

主要参考http://blog.csdn.NET/joyhen/article/details/24805899和http://www.cnblogs.com/yanweidie/p/4605212.html

根据自己需求，做些测试、修改、整理。

使用Newtonsoft.Json

一、用JsonConvert序列化和反序列化。

实体类不用特殊处理，正常定义属性即可，控制属性是否被序列化参照高级用法1。

[csharp] view plain copy

public interface IPerson
{
string FirstName
{
get;
set;
}
string LastName
{
get;
set;
}
DateTime BirthDate
{
get;
set;
}
}
public class Employee : IPerson
{
public string FirstName
{
get;
set;
}
public string LastName
{
get;
set;
}
public DateTime BirthDate
{
get;
set;
}
public string Department
{
get;
set;
}
public string JobTitle
{
get;
set;
}
public string NotSerialize { get; set; }
}
public class PersonConverter : Newtonsoft.Json.Converters.CustomCreationConverter<IPerson>
{
//重写abstract class CustomCreationConverter<T>的Create方法
public override IPerson Create(Type objectType)
{
return new Employee();
}
}
public class Product
{
public string Name { get; set; }
public DateTime Expiry { get; set; }
public Decimal Price { get; set; }
public string[] Sizes { get; set; }
public string NotSerialize { get; set; }
}

1.序列化代码：

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#region 序列化用JsonConvert
public string TestJsonSerialize()
{
Product product = new Product();
product.Name = "Apple";
product.Expiry = DateTime.Now;//.AddDays(3).ToString("yyyy-MM-dd hh:mm:ss");
product.Price = 3.99M;
//string json = Newtonsoft.Json.JsonConvert.SerializeObject(product); //没有缩进输出
string json = Newtonsoft.Json.JsonConvert.SerializeObject(product, Newtonsoft.Json.Formatting.Indented);//有缩进输出
//string json = Newtonsoft.Json.JsonConvert.SerializeObject(
// product,
// Newtonsoft.Json.Formatting.Indented,
// new Newtonsoft.Json.JsonSerializerSettings { NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore }//参照高级用法中有关JsonSerializerSettings用法
//);
return json;
}
public string TestListJsonSerialize()
{
Product product = new Product();
product.Name = "Apple";
product.Expiry = DateTime.Now;//.AddDays(3).ToString("yyyy-MM-dd hh:mm:ss");
product.Price = 3.99M;
product.Sizes = new string[] { "Small", "Medium", "Large" };
List<Product> plist = new List<Product>();
plist.Add(product);
plist.Add(product);
string json = Newtonsoft.Json.JsonConvert.SerializeObject(plist, Newtonsoft.Json.Formatting.Indented);
return json;
}
#endregion

2.反序列化代码：

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#region 反序列化用JsonConvert
public string TestJsonDeserialize()
{
string strjson = "{\\"Name\\":\\"Apple\\",\\"Expiry\\":\\"2014-05-03 10:20:59\\",\\"Price\\":3.99,\\"Sizes\\":[\\"Small\\",\\"Medium\\",\\"Large\\"]}";
Product p = Newtonsoft.Json.JsonConvert.DeserializeObject<Product>(strjson);
string template = @"
Name:{0}
Expiry:{1}
Price:{2}
Sizes:{3}
";
return string.Format(template, p.Name, p.Expiry, p.Price.ToString(), string.Join(",", p.Sizes));
}
public string TestListJsonDeserialize()
{
string strjson = "{\\"Name\\":\\"Apple\\",\\"Expiry\\":\\"2014-05-03 10:20:59\\",\\"Price\\":3.99,\\"Sizes\\":[\\"Small\\",\\"Medium\\",\\"Large\\"]}";
List<Product> plist = Newtonsoft.Json.JsonConvert.DeserializeObject<List<Product>>(string.Format("[{0},{1}]", strjson, strjson));
string template = @"
Name:{0}
Expiry:{1}
Price:{2}
Sizes:{3}
";
System.Text.StringBuilder strb = new System.Text.StringBuilder();
plist.ForEach(x =>
strb.AppendLine(
string.Format(template, x.Name, x.Expiry, x.Price.ToString(), string.Join(",", x.Sizes))
)
);
return strb.ToString();
}
#endregion

3.自定义序列化，使用实体类中定义的PersonConverter，每反序列化一次实体时会调用一次PersonConverter，还没想清楚如何用。

[csharp] view plain copy

#region 自定义反序列化
public string TestListCustomDeserialize()
{
string strJson = "[ { \\"FirstName\\": \\"Maurice\\", \\"LastName\\": \\"Moss\\", \\"BirthDate\\": \\"1981-03-08T00:00Z\\", \\"Department\\": \\"IT\\", \\"JobTitle\\": \\"Support\\" }, { \\"FirstName\\": \\"Jen\\", \\"LastName\\": \\"Barber\\", \\"BirthDate\\": \\"1985-12-10T00:00Z\\", \\"Department\\": \\"IT\\", \\"JobTitle\\": \\"Manager\\" } ] ";
List<IPerson> people = Newtonsoft.Json.JsonConvert.DeserializeObject<List<IPerson>>(strJson, new PersonConverter());
IPerson person = people[0];
string template = @"
当前List<IPerson>[x]对象类型：{0}
FirstName：{1}
LastName：{2}
BirthDate：{3}
Department：{4}
JobTitle：{5}
";
System.Text.StringBuilder strb = new System.Text.StringBuilder();
people.ForEach(x =>
strb.AppendLine(
string.Format(
template,
person.GetType().ToString(),
x.FirstName,
x.LastName,
x.BirthDate.ToString(),
((Employee)x).Department,
((Employee)x).JobTitle
)
)
);
return strb.ToString();
}
#endregion

4、获取Json字符串中部分内容

[csharp] view plain copy

#region Serializing Partial JSON Fragment Example
public class SearchResult
{
public string Title { get; set; }
public string Content { get; set; }
public string Url { get; set; }
}
public string SerializingJsonFragment()
{
#region
string googleSearchText = @"{
\'responseData\': {
\'results\': [{
\'GsearchResultClass\': \'GwebSearch\',
\'unescapedUrl\': \'http://en.wikipedia.org/wiki/Paris_Hilton\',
\'url\': \'http://en.wikipedia.org/wiki/Paris_Hilton\',
\'visibleUrl\': \'en.wikipedia.org\',
\'cacheUrl\': \'http://www.google.com/search?q=cache:TwrPfhd22hYJ:en.wikipedia.org\',
\'title\': \'Paris Hilton - Wikipedia, the free encyclopedia\',
\'titleNoFormatting\': \'Paris Hilton - Wikipedia, the free encyclopedia\',
\'content\': \'[1] In 2006, she released her debut album...\'
},
{
\'GsearchResultClass\': \'GwebSearch\',
\'unescapedUrl\': \'http://www.imdb.com/name/nm0385296/\',
\'url\': \'http://www.imdb.com/name/nm0385296/\',
\'visibleUrl\': \'www.imdb.com\',
\'cacheUrl\': \'http://www.google.com/search?q=cache:1i34KkqnsooJ:www.imdb.com\',
\'title\': \'Paris Hilton\',
\'titleNoFormatting\': \'Paris Hilton\',
\'content\': \'Self: Zoolander. Socialite Paris Hilton...\'
}],
\'cursor\': {
\'pages\': [{
\'start\': \'0\',
\'label\': 1
},
{
\'start\': \'4\',
\'label\': 2
},
{
\'start\': \'8\',
\'label\': 3
},
{
\'start\': \'12\',
\'label\': 4
}],
\'estimatedResultCount\': \'59600000\',
\'currentPageIndex\': 0,
\'moreResultsUrl\': \'http://www.google.com/search?oe=utf8&ie=utf8...\'
}
},
\'responseDetails\': null,
\'responseStatus\': 200
}";
#endregion
Newtonsoft.Json.Linq.JObject googleSearch = Newtonsoft.Json.Linq.JObject.Parse(googleSearchText);
// get JSON result objects into a list
List<Newtonsoft.Json.Linq.JToken> listJToken = googleSearch["responseData"]["results"].Children().ToList();
System.Text.StringBuilder strb = new System.Text.StringBuilder();
string template = @"
Title:{0}
Content: {1}
Url:{2}
";
listJToken.ForEach(x =>
{
// serialize JSON results into .NET objects
SearchResult searchResult = Newtonsoft.Json.JsonConvert.DeserializeObject<SearchResult>(x.ToString());
strb.AppendLine(string.Format(template, searchResult.Title, searchResult.Content, searchResult.Url));
});
return strb.ToString();
}
#endregion

输出结果

[csharp] view plain copy

Title:Paris Hilton - Wikipedia, the free encyclopedia
Content: [1] In 2006, she released her debut album...
Url:http://en.wikipedia.org/wiki/Paris_Hilton
Title:Paris Hilton
Content: Self: Zoolander. Socialite Paris Hilton...
Url:http://www.imdb.com/name/nm0385296/

5、利用Json.Linq序列化

可以突破实体类的限制，自由组合要序列化的值

[csharp] view plain copy

public class Linq2Json
{
#region GetJObject
//Parsing a JSON Object from text
public Newtonsoft.Json.Linq.JObject GetJObject()
{
string json = @"{
CPU: \'Intel\',
Drives: [
\'DVD read/writer\',
\'500 gigabyte hard drive\'
]
}";
Newtonsoft.Json.Linq.JObject jobject = Newtonsoft.Json.Linq.JObject.Parse(json);
return jobject;
}
/*
* //example:=>
*
Linq2Json l2j = new Linq2Json();
Newtonsoft.Json.Linq.JObject jobject = l2j.GetJObject2(Server.MapPath("json/Person.json"));
//return Newtonsoft.Json.JsonConvert.SerializeObject(jobject, Newtonsoft.Json.Formatting.Indented);
return jobject.ToString();
*/
//Loading JSON from a file
public Newtonsoft.Json.Linq.JObject GetJObject2(string jsonPath)
{
using (System.IO.StreamReader reader = System.IO.File.OpenText(jsonPath))
{
Newtonsoft.Json.Linq.JObject jobject = (Newtonsoft.Json.Linq.JObject)Newtonsoft.Json.Linq.JToken.ReadFrom(new Newtonsoft.Json.JsonTextReader(reader));
return jobject;
}
}
//Creating JObject
public Newtonsoft.Json.Linq.JObject GetJObject3()
{
List<Post> posts = GetPosts();
Newtonsoft.Json.Linq.JObject jobject = Newtonsoft.Json.Linq.JObject.FromObject(new
{
channel = new
{
title = "James Newton-King",
link = "http://james.newtonking.com",
description = "James Newton-King\'s blog.",
item =
from p in posts
orderby p.Title
select new
{
title = p.Title,
description = p.Description,
link = p.Link,
category = p.Category
}
}
});
return jobject;
}
/*
{
"channel": {
"title": "James Newton-King",
"link": "http://james.newtonking.com",
"description": "James Newton-King\'s blog.",
"item": [{
"title": "jewron",
"description": "4546fds",
"link": "http://www.baidu.com",
"category": "jhgj"
},
{
"title": "jofdsn",
"description": "mdsfan",
"link": "http://www.baidu.com",
"category": "6546"
},
{
"title": "jokjn",
"description": "m3214an",
"link": "http://www.baidu.com",
"category": "hg425"
},
{
"title": "jon",
"description": "man",
"link": "http://www.baidu.com",
"category": "goodman"
}]
}
}
*/
//Creating JObject
public Newtonsoft.Json.Linq.JObject GetJObject4()
{
List<Post> posts = GetPosts();
Newtonsoft.Json.Linq.JObject rss = new Newtonsoft.Json.Linq.JObject(
new Newtonsoft.Json.Linq.JProperty("channel",
new Newtonsoft.Json.Linq.JObject(
new Newtonsoft.Json.Linq.JProperty("title", "James Newton-King"),
new Newtonsoft.Json.Linq.JProperty("link", "http://james.newtonking.com"),
new Newtonsoft.Json.Linq.JProperty("description", "James Newton-King\'s blog."),
new Newtonsoft.Json.Linq.JProperty("item",
new Newtonsoft.Json.Linq.JArray(
from p in posts
orderby p.Title
select new Newtonsoft.Json.Linq.JObject(
new Newtonsoft.Json.Linq.JProperty("title", p.Title),
new Newtonsoft.Json.Linq.JProperty("description", p.Description),
new Newtonsoft.Json.Linq.JProperty("link", p.Link),
new Newtonsoft.Json.Linq.JProperty("category",
new Newtonsoft.Json.Linq.JArray(
from c in p.Category
select new Newtonsoft.Json.Linq.JValue(c)
)
)
)
)
)
)
)
);
return rss;
}
/*
{
"channel": {
"title": "James Newton-King",
"link": "http://james.newtonking.com",
"description": "James Newton-King\'s blog.",
"item": [{
&nb
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