C#获取中英文混合字符串长度和截取函数
using System.Text.RegularExpressions; using System.Text; /// <summary> /// 字符串长度(按字节算) /// </summary> /// <param name="str"></param> /// <returns></returns> static int StrLength(string str) { int len = 0; byte[] b; for (int i = 0; i < str.Length; i++) { b = Encoding.Default.GetBytes(str.Substring(i,1)); if (b.Length > 1) len += 2; else len++; } return len; } /// <summary> /// 截取指定长度字符串(按字节算) /// </summary> /// <param name="str"></param> /// <param name="length"></param> /// <returns></returns> static string StrCut(string str, int length) { int len = 0; byte[] b; StringBuilder sb = new StringBuilder(); for (int i = 0; i < str.Length; i++) { b = Encoding.Default.GetBytes(str.Substring(i, 1)); if (b.Length > 1) len += 2; else len++; if (len >= length) break; sb.Append(str[i]); } return sb.ToString(); }