用法一 this代表當(dāng)前類的實例對象
namespace Demo{ public class Test { private string scope = "全局變量"; public string getResult() { string scope = "局部變量"; // this代表Test的實例對象 // 所以this.scope對應(yīng)的是全局變量 // scope對應(yīng)的是getResult方法內(nèi)的局部變量 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串聯(lián)構(gòu)造函數(shù)
namespace Demo{ public class Test { public Test() { Console.WriteLine("無參構(gòu)造函數(shù)"); } // this()對應(yīng)無參構(gòu)造方法Test() // 先執(zhí)行Test()，后執(zhí)行Test(string text) public Test(string text) : this() { Console.WriteLine(text); Console.WriteLine("有參構(gòu)造函數(shù)"); } }
class Program { static void Main(string[] args) { try { Test test = new Test("張三"); } catch (Exception ex) { Console.WriteLine(ex); } finally { Console.ReadLine(); } } }}
用法三 為原始類型擴展方法
namespace Demo{ public static class Extends { // string類型擴展ToJson方法 public static object ToJson(this string Json) { return Json == null ? null : JsonConvert.DeserializeObject(Json); } // object類型擴展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="張三"}, new User{ID="2",Code="ls",Name="李四"} };
// list轉(zhuǎn)化json字符串 string json = users.ToJson(); // string轉(zhuǎn)化List users = json.ToList<User>();
// string轉(zhuǎn)化DataTable DataTable 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; } }}
該文章在 2024/3/28 22:12:22 編輯過
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