Json序列化和反序列化–Newtonsoft.Json

using Newtonsoft.Json;

写入文件，读取文件后，要及时释放FileStream ，StreamWriter StreamReader ，否则可能导致读写失败；

反序列化使用泛型方法，而不应使用as转换；

as可能导致转型失败；

JsonConvert.DeserializeObject<CStudent>(json)

string path = Application.StartupPath + @\"\\data.json\";private void button2_Click(object sender, EventArgs e){listBox1.Items.Add(path);CStudent student = new CStudent() { Name = \"Tome\", Sex = \"male\", Age = 18 };string json = JsonConvert.SerializeObject(student);using (FileStream stream = new FileStream(path, FileMode.OpenOrCreate)){StreamWriter sw = new StreamWriter(stream);sw.Write(json);sw.Dispose();}        }

private void button3_Click(object sender, EventArgs e){listBox1.Items.Clear();if (!File.Exists(path)) return;string json =null;using (FileStream stream = new FileStream(path, FileMode.Open)){StreamReader sr = new StreamReader(stream);json = sr.ReadToEnd();sr.Dispose();}listBox1.Items.Add(\"(json ==null)?\" + (json == null));if (json ==null) return;var student3 = JsonConvert.DeserializeObject<CStudent>(json);listBox1.Items.Add(student3.Name);listBox1.Items.Add(student3.Sex);listBox1.Items.Add(student3.Age);listBox1.Items.Add(\"Say():\"+student3.Say());}