字符串(String)的一系列操做

字符串(String)的一系列操做   Post By：2008-10-11 11:15:00

//字符串访问             //string s = "ABCD";             //Console.WriteLine(s[0]);//第0位字符             //Console.WriteLine(s.Length);//字符串长度             //-----------------------------------------------------------             //打散             //string s = "ABCD";             //char[] arr = s.ToCharArray();//将字符串打散,并放入字符数组中.             //Console.WriteLine(arr[0]);//arr[0]='A',arr[1]='B',arr[2]='C',arr[3]='D'             //-----------------------------------------------------------             //截取             //string s = "ABCD";             //Console.WriteLine(s.Substring(1));//从第二位开始截取到最后一位,显示BCD             //Console.WriteLine(s.Substring(2, 2));//从第三位开始截取二个,显示CD                         //-----------------------------------------------------------             //字符匹配             //string s = "ABCABCD";             //Console.WriteLine(s.IndexOf('A'));//找到该字符,返回所在位置.输出0             //Console.WriteLine(s.IndexOf("BCD"));//找到该串,返回头所在位置.输出4             //Console.WriteLine(s.IndexOf('E'));//当找不到任何相关的匹配时,输出-1;             //Console.WriteLine(s.LastIndexOf('C'));//从末尾开始匹配,输出5             //Console.WriteLine(s.LastIndexOf("AB"));//同上,输出3             //Console.WriteLine(s.Contains("ABCD"));//判断此字符串是否是在另外一字符串匹配             //-----------------------------------------------------------             //大小写转换             //string s = "aBcD";             //Console.WriteLine(s.ToLower());//将字符串转为小写,输出abcd             //Console.WriteLine(s.ToUpper());//将字符串将为大小,输出ABCD             //-----------------------------------------------------------             //匹配移除             //string s = "_@$_AB__CD_$@_";             //Console.WriteLine(s.Trim('_'));//移除首和尾匹配字符,输出@$_AB__CD_$@             //Console.WriteLine(s.TrimStart('_'));//移除首部字符,输出@$_AB__CD_$@_             //Console.WriteLine(s.TrimEnd('_'));//移除尾部字符,输出_@$_AB__CD_$@             //Console.WriteLine(s.Trim('_', '@', '$'));//只能移除字符,能够写不少..输出AB__CD             //-----------------------------------------------------------             //插入和删除             //string s = "ADEF";             //Console.WriteLine(s.Insert(1, "BC"));//在字符串什么位置插入字符串,输出ABCDEF             //Console.WriteLine(s.Remove(1));//从字符串第二个位开始到最后的字符都删除,输出A             //Console.WriteLine(s.Remove(0, 2));//从第一位开始删除二个字符,输出EF             //-----------------------------------------------------------             //替换             //string s = "A_B_C_D";             //Console.WriteLine(s.Replace('_', ':'));输出A:B:C:D             //Console.WriteLine(s.Replace("_", ""));//只有字符串才能替换空字符,输出ABCD             //-----------------------------------------------------------             //分割             //string s = "A,B,C,D";             //string[] arr = s.Split(',');             //Console.WriteLine(arr[0]);输出A             //Console.WriteLine(arr[1]);输出B             //Console.WriteLine(arr[2]);输出C             //Console.WriteLine(arr[3]);输出D             //-----------------------------------------------------------             //链接             //string[] arr = new string[] { "A", "B", "C", "D" };             //Console.WriteLine(string.Concat(arr));//链接字符串数组             //Console.WriteLine(string.Join(",", arr));//链接字符串数组,并带有分隔             //StringBuilder stringBuilder = new StringBuilder();//一种很高效的链接字符串的方式             //stringBuilder.Append(arr[0]);             //stringBuilder.Append(arr[1]);             //stringBuilder.Append(arr[2]);             //stringBuilder.Append(arr[3]);             //Console.WriteLine(stringBuilder.ToString());