截取指定长度的字符串，区分汉字和字符代码,CSharp代码库,德仔网

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【CSharp】截取指定长度的字符串，区分汉字和字符

作者:dezai / 发布于2014/5/14/ 450

using System.Text;
using System.Text.RegularExpressions;



 int current = 30;
 int location_http = lblContext.Text.IndexOf("http");
 int location_img = lblContext.Text.IndexOf("img");
 if (location_http < current && location_http > 0)
 {
 current = location_http;
 }
 if (location_img < current && location_img > 0)
 {
 current = location_img;
 }


 lblContext.Text = GetFirstString(lblContext.Text, current);


 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();
 }

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　截取字符串　

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