字符串的處理[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("字符串Str1中第二個字符是:{0}", Str2);
??????????? //Console.WriteLine("字符串Str1中第三個字符是:{0}", Str3);
??????????? //#endregion

??????????? //#region Conpare/CompareTo比較字符串的使用
??????????? //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)); //判斷兩個字符串是否相等
??????????? //#endregion

??????????? //#region ForMat格式化輸出字符串
??????????? //string newstr = String.Format("{0},{1}!!!", Str1, Str2); //ForMat格式化字符串
??????????? //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);
??????????? //#endregion

??????????? //#region 截取字符串
??????????? //string Str3 = "";
??????????? //Str3 = Str1.Substring(1, 3);
??????????? //Console.WriteLine(Str3);
??????????? //#endregion

??????????? //#region 分割字符串
??????????? //string Str3 = "用!一生，下載";
??????????? //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]);
??????????? //}
??????????? //#endregion

??????????? //#region 插入和填充字符串
??????????? //string str3 = "下載";
??????????? //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, '(');???? //在字符串左側添加，確保添加后的總字符串為6
??????????? //string str8 = str7.PadRight(7, ')');
??????????? //Console.WriteLine("補充字符串之前" + str6);
??????????? //Console.WriteLine("補充字符串之后" + str8);
??????????? //#endregion

??????????? //#region 刪除字符串
??????????? //string str3 = "用一生下載你";
??????????? //string str4 = str3.Remove(3);? //3為所以字符 往后的都刪掉
??????????? //Console.WriteLine(str4);

??????????? //string str5 = str3.Remove(0, 3);? //0為索引，3為刪除的字符數
??????????? //Console.WriteLine(str5);
??????????? //#endregion

??????????? //#region 字符串的復制
??????????? //string str = "我愛你forever";
??????????? //string Str;
??????????? //Str = String.Copy(str);?? //將str復制給Str
??????????? //Console.WriteLine(Str);

??????????? //string str3 = "用一生下載你";
??????????? //char[] str4 = new char[100];
??????????? //str3.CopyTo(1, str4, 0, 4);???? //第一個參數是原字符要復制的起始位置，第二個是新字符，第三個是新字符的復制的起始位置，第四個是復制的字符個數
??????????? //Console.WriteLine(str4);
??????????? //#endregion

??????????? //string a = "one world ,one dream";
??????????? //string b = a.Replace(',','*');??? // 字符的替換用單引號
??????????? //Console.WriteLine(b);
??????????? //string c = a.Replace("one world","One World");? //字符串替換用雙引號
??????????? //Console.WriteLine(c);