字符串的一些操作（转）

1 字符串分割

string url = "http://asdfsfd asdf asdfsdf ";string[] sss = GetString(url," ");foreach(string str in sss){Response.Write(str.ToString() +" ");}

private string[] GetString(string str,string cutStr){char[] cutChar = cutStr.ToCharArray();string[] sArray = str.Split(cutChar);return sArray;}

2 字符串截取

public static string GetFirstString(string stringToSub, int length) {Regex regex = new Regex("[/u4e00-/u9fa5]+", RegexOptions.Compiled);char[] stringChar = stringToSub.ToCharArray();StringBuilder sb = new StringBuilder();int nLength = 0;bool isCut=false;for(int i = 0; i < stringChar.Length; i++) {if (regex.IsMatch((stringChar[i]).ToString())) {sb.Append(stringChar[i]);nLength += 2;}else {sb.Append(stringChar[i]);nLength = nLength + 1;}

if (nLength > length){isCut=true;break;}}if(isCut)return sb.ToString()+"...";elsereturn sb.ToString();}

3.取子串函数SubStringstring tmp2 = tmp1.SubString(0,3);相当于vb.net中的midtring str="abcdefg";string str1=str.Substring(2,3);//str1="cde"

4.C#中有什么函数可以判断某一字符串中是否存在着某一字符？如："akkk*kkk"是否有“*”？

string s = "akkk*kkk";int i = s.IndexOf("*");

if( i != -1) 包含else 不包含

5.右对齐此实例中的字符，在左边用指定的 Unicode 字符填充以达到指定的总长度。[C#] public string PadLeft(int, char);str = "256";str = str.PadLeft(5,"0"); //str = "00256"