使用开源的类库Newtonsoft.Json(下载地址http://json.codeplex.com/)。下载后加入工程就能用。通常可以使用JObject, JsonReader, JsonWriter处理。这种方式最通用，也最灵活，可以随时修改不爽的地方。
(1)使用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); }
(2)使用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);
(3)使用JObject读写字符串：
JObject jo = JObject.Parse(jsonText); string[] values = jo.Properties().Select(item => item.Value.ToString()).ToArray();
(4)使用JsonSerializer读写对象(基于JsonWriter与JsonReader):
数组型数据
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
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);
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);
上面的代码都是基于下面这个Project类定义：
class Project
{
public string Input { get; set; }
public string Output { get; set; }
}
{
public string Input { get; set; }
public string Output { get; set; }
}
此外，如果上面的JsonTextReader等类编译不过的话，说明是我们自己修改过的类，换成你们自己的相关类就可以了，不影响使用。
本文转自黄聪博客园博客，原文链接：http://www.cnblogs.com/huangcong/p/4381451.html，如需转载请自行联系原作者
