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序列化
Product product = new Product();
product.ExpiryDate = new DateTime(2008, 12, 28);
JsonSerializer serializer = new JsonSerializer();
serializer.Converters.Add(new JavaScriptDateTimeConverter());
serializer.NullValueHandling = NullValueHandling.Ignore;
using (StreamWriter sw = new StreamWriter(@"c:\json.txt"))
using (JsonWriter writer = new JsonTextWriter(sw))
{
serializer.Serialize(writer, product);
// {"ExpiryDate":new Date(1230375600000),"Price":0}
}
JsonReader读Json字符串
string jsonText = @"{""input"" : ""value"", ""output"" : ""result""}"; JsonReader reader = new JsonTextReader(new StringReader(jsonText)); while (reader.Read()) { Console.WriteLine(reader.TokenType + "\t\t" + reader.ValueType + "\t\t" + reader.Value); }
JsonWriter写字符串
StringWriter sw = new StringWriter(); JsonWriter writer = new JsonTextWriter(sw); writer.WriteStartObject(); writer.WritePropertyName("input"); writer.WriteValue("value"); writer.WritePropertyName("output"); writer.WriteValue("result"); writer.WriteEndObject(); writer.Flush(); string jsonText = sw.GetStringBuilder().ToString(); Console.WriteLine(jsonText);
使用JObject读写字符串
JObject jo = JObject.Parse(jsonText); string[] values = jo.Properties().Select(item => item.Value.ToString()).ToArray();
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
string jsonText = "[{‘a‘:‘aaa‘,‘b‘:‘bbb‘,‘c‘:‘ccc‘},{‘a‘:‘aaa2‘,‘b‘:‘bbb2‘,‘c‘:‘ccc2‘}]";
JArray ja =(JArray) JsonConvert.DeserializeObject(jsonText);
JObject o = (JObject)ja[1];
Console.WriteLine(o["a"]);
Console.WriteLine(ja[1]["a"]);
JsonSerializer读写对象(基于JsonWriter与JsonReader)
string jsonArrayText1 = "[{‘a‘:‘a1‘,‘b‘:‘b1‘},{‘a‘:‘a2‘,‘b‘:‘b2‘}]"; JArray ja = (JArray)JsonConvert.DeserializeObject(jsonArrayText1); string ja1a = ja[1]["a"].ToString(); //或者 JObject o = (JObject)ja[1]; string oa = o["a"].ToString();
嵌套格式
string jsonText = "{\"beijing\":{\"zone\":\"海淀\",\"zone_en\":\"haidian\"}}";
JObject jo = (JObject)JsonConvert.DeserializeObject(jsonText);
string zone = jo["beijing"]["zone"].ToString();
string zone_en = jo["beijing"]["zone_en"].ToString();
自定义类Project
class Project
{
public string Input { get; set; }
public string Output { get; set; }
}
Project p = new Project() { Input = "stone", Output = "gold" };
JsonSerializer serializer = new JsonSerializer();
StringWriter sw = new StringWriter();
serializer.Serialize(new JsonTextWriter(sw), p);
Console.WriteLine(sw.GetStringBuilder().ToString());
StringReader sr = new StringReader(@"{""Input"":""stone"", ""Output"":""gold""}");
Project p1 = (Project)serializer.Deserialize(new JsonTextReader(sr), typeof(Project));
Console.WriteLine(p1.Input + "=>" + p1.Output);
契约方式：使用System.Runtime.Serialization.dll提供的DataContractJsonSerializer或者 JsonReaderWriterFactory实现
Project p = new Project() { Input = "stone", Output = "gold" }; DataContractJsonSerializer serializer = new DataContractJsonSerializer(p.GetType()); string jsonText; using (MemoryStream stream = new MemoryStream()) { serializer.WriteObject(stream, p); jsonText = Encoding.UTF8.GetString(stream.ToArray()); Console.WriteLine(jsonText); } using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonText))) { DataContractJsonSerializer serializer1 = new DataContractJsonSerializer(typeof(Project)); Project p1 = (Project)serializer1.ReadObject(ms); Console.WriteLine(p1.Input + "=>" + p1.Output); }
这里要注意，这里的Project类和成员要加相关的Attribute：
[DataContract] class Project { [DataMember] public string Input { get; set; } [DataMember] public string Output { get; set; } }
实用参考：
JSON验证工具：http://jsonlint.com/
JSON简明教程：http://www.w3school.com.cn/json/
Newtonsoft.Json类库下载：http://json.codeplex.com/
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原文地址：http://www.cnblogs.com/zeroone/p/4743662.html
