有从网上找的和自己在用的方法：
1.CSS法<个人认为几种中比较好的方法，可以减少后台程序服务>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <style> .p_Name { PADDING-LEFT: 0px; OVERFLOW: hidden; WIDTH: 90px; WORD-BREAK: break-all; HEIGHT: 40px } </style> </HEAD> <BODY> <div class="p_Name">sssssssssssssssssssssssssssss<br>ssssssssssssssssssssssssssssssssssssss</div> </BODY> </HTML>
2.使用正则区分中英文进行双字节符计算 不错
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()+".."; else return sb.ToString(); }
3.编码字节
public string GetLimitedStr(string aSrcStr,int aLimitedNum) { if (aLimitedNum<=0) return aSrcStr; //String TmpStr=RemoveHTMLStr(aSrcStr); String TmpStr=aSrcStr; byte[] TmpStrBytes = System.Text.Encoding.GetEncoding("GB2312").GetBytes(TmpStr); if(TmpStrBytes.Length<=aLimitedNum) return aSrcStr; else { byte[] LStrBytes=null; int NeedStrNum=0; if (TmpStrBytes[aLimitedNum]>127) { LStrBytes=new byte[aLimitedNum+1]; NeedStrNum=aLimitedNum+1; } else { LStrBytes=new byte[aLimitedNum]; NeedStrNum=aLimitedNum; } Array.Copy(TmpStrBytes,LStrBytes,NeedStrNum); return System.Text.Encoding.GetEncoding("GB2312").GetString(LStrBytes); } }
4.其它网上流传
public static string SubComment(string original, int width) { int len = original.Length; if (len < width) return original; int clen = 0;//当前长度 int cwidth = 0;//当前宽度 while (clen < len && cwidth < width) { if ((int) original[clen] > 128) cwidth++; clen++; cwidth++; } return original.Substring(0, clen); }