用法一 this代表当前类的实例对象
namespace Demo
{public class Test{private string scope = "全局变量";public string getResult(){string scope = "局部变量";// this代表Test的实例对象// 所以this.scope对应的是全局变量// scope对应的是getResult方法内的局部变量return this.scope + "-" + scope;}}class Program{static void Main(string[] args){try{Test test = new Test();Console.WriteLine(test.getResult());}catch (Exception ex){Console.WriteLine(ex);}finally{Console.ReadLine();}}}
}
用法二 用this串联构造函数
namespace Demo
{public class Test{public Test(){Console.WriteLine("无参构造函数");}// this()对应无参构造方法Test()// 先执行Test()，后执行Test(string text)public Test(string text) : this(){Console.WriteLine(text);Console.WriteLine("有参构造函数");}}class Program{static void Main(string[] args){try{Test test = new Test("张三");}catch (Exception ex){Console.WriteLine(ex);}finally{Console.ReadLine();}}}
}
用法三 为原始类型扩展方法
namespace Demo
{public static class Extends{// string类型扩展ToJson方法public static object ToJson(this string Json){return Json == null ? null : JsonConvert.DeserializeObject(Json);}// object类型扩展ToJson方法public static string ToJson(this object obj){var timeConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy-MM-dd HH:mm:ss" };return JsonConvert.SerializeObject(obj, timeConverter);}public static string ToJson(this object obj, string datetimeformats){var timeConverter = new IsoDateTimeConverter { DateTimeFormat = datetimeformats };return JsonConvert.SerializeObject(obj, timeConverter);}public static T ToObject<T>(this string Json){return Json == null ? default(T) : JsonConvert.DeserializeObject<T>(Json);}public static List<T> ToList<T>(this string Json){return Json == null ? null : JsonConvert.DeserializeObject<List<T>>(Json);}public static DataTable ToTable(this string Json){return Json == null ? null : JsonConvert.DeserializeObject<DataTable>(Json);}public static JObject ToJObject(this string Json){return Json == null ? JObject.Parse("{}") : JObject.Parse(Json.Replace(" ", ""));}}class Program{static void Main(string[] args){try{List<User> users = new List<User>{new User{ID="1",Code="zs",Name="张三"},new User{ID="2",Code="ls",Name="李四"}};// list转化json字符串string json = users.ToJson();// string转化Listusers = json.ToList<User>();// string转化DataTableDataTable dt = json.ToTable();}catch (Exception ex){Console.WriteLine(ex);}finally{Console.ReadLine();}}}public class User{public string ID { get; set; }public string Code { get; set; }public string Name { get; set; }}
}
)
