字元串的處理[C#]

            //string Str1 = "友情相逢";

            //string Str2 = "用一生愛你";

            //#region char的使用

            //char a = 'a';

            //Console.WriteLine("IsLetter方法判斷a是否為字母：{0}", Char.IsLetter(a));

            //Console.WriteLine("IsDigit方法判斷a是否為數字：{0}", Char.IsDigit(a));

            //Console.WriteLine("IsLower方法判斷a是否為小寫字母：{0}", Char.IsLower(a));

            //Console.WriteLine("IsUpper方法判斷a是否為大寫字母：{0}", Char.IsUpper(a));

            //Console.WriteLine("IsWhiteSpace方法判斷a是否為空白：{0}", Char.IsWhiteSpace(a));

            //#endregion

            //#region String類的使用

            //string Str1 = "用一生愛護你！";

            //char Str2 = Str1[1];

            //char Str3 = Str1[2];

            //Console.WriteLine("字元串Str1中第二個字元是:{0}", Str2);

            //Console.WriteLine("字元串Str1中第三個字元是:{0}", Str3);

            //#region Conpare/CompareTo比較字元串的使用

            //Console.WriteLine(string.Compare(Str1, Str2));

            //Console.WriteLine(string.Compare(Str1, Str1));

            //Console.WriteLine(string.Compare(Str2, Str1));

            //Console.WriteLine(Str1.CompareTo(Str2));

            //Console.WriteLine(string.Equals(Str1,Str2)); //判斷兩個字元串是否相等

            //#region ForMat格式化輸出字元串

            //string newstr = String.Format("{0},{1}!!!", Str1, Str2); //ForMat格式化字元串

            //Console.WriteLine(newstr);

            //DateTime dt = DateTime.Now;

            //string time1 = string.Format("{0:D}", dt);

            //string time2 = string.Format("{0:T}", dt);

            //string time3 = string.Format("{0:G}", dt);

            //Console.Write(time1);

            //Console.WriteLine(time2);

            //Console.WriteLine(time3);

            //#region 截取字元串

            //string Str3 = "";

            //Str3 = Str1.Substring(1, 3);

            //Console.WriteLine(Str3);

            //#region 分割字元串

            //string Str3 = "用!一生，下載下傳";

            //char[] separator = { '!', '，' };

            //String[] splitstrings = new String[20];

            //splitstrings = Str3.Split(separator);

            //for (int i = 0; i <= splitstrings.Length; i++)

            //{

            //    Console.WriteLine("item{0}:{1}", i, splitstrings[i]);

            //}

            //#region 插入和填充字元串

            //string str3 = "下載下傳";

            //string str4;

            //str4 = str3.Insert(0, "用一生");

            //string str5 = str4.Insert(5, "你");

            //Console.WriteLine(str5);

            //string str6 = "*+_+*";

            //string str7 = str6.PadLeft(6, '(');     //在字元串左側添加，確定添加後的總字元串為6

            //string str8 = str7.PadRight(7, ')');

            //Console.WriteLine("補充字元串之前" + str6);

            //Console.WriteLine("補充字元串之後" + str8);

            //#region 删除字元串

            //string str3 = "用一生下載下傳你";

            //string str4 = str3.Remove(3);  //3為是以字元 往後的都删掉

            //Console.WriteLine(str4);

            //string str5 = str3.Remove(0, 3);  //0為索引，3為删除的字元數

            //#region 字元串的複制

            //string str = "我愛你forever";

            //string Str;

            //Str = String.Copy(str);   //将str複制給Str

            //Console.WriteLine(Str);

            //char[] str4 = new char[100];

            //str3.CopyTo(1, str4, 0, 4);     //第一個參數是原字元要複制的起始位置，第二個是新字元，第三個是新字元的複制的起始位置，第四個是複制的字元個數

            //string a = "one world ,one dream";

            //string b = a.Replace(',','*');    // 字元的替換用單引号

            //Console.WriteLine(b);

            //string c = a.Replace("one world","One World");  //字元串替換用雙引号

            //Console.WriteLine(c);