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:kkcat / 发布于2013/6/17/ 1132


	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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　截取指定长度　

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