c#模拟js escape方法的简单实例

public static string escape(string s)
        {
            stringbuilder sb = new stringbuilder();
            byte[] ba = system.text.encoding.unicode.getbytes(s);
            for (int i = 0; i < ba.length; i += 2)
            {
                if (ba[i + 1] == 0)
                {
                    //数字,大小写字母,以及"+-*/._"不变
                    if (
                          (ba[i] >= 48 && ba[i] <= 57)
                        || (ba[i] >= 64 && ba[i] <= 90)
                        || (ba[i] >= 97 && ba[i] <= 122)
                        || (ba[i] == 42 || ba[i] == 43 || ba[i] == 45 || ba[i] == 46 || ba[i] == 47 || ba[i] == 95)
                        )//保持不变
                    {
                        sb.append(encoding.unicode.getstring(ba, i, 2));

                    }
                    else//%xx形式
                    {
                        sb.append("%");
                        sb.append(ba[i].tostring("x2"));
                    }
                }
                else
                {
                    sb.append("%u");
                    sb.append(ba[i + 1].tostring("x2"));
                    sb.append(ba[i].tostring("x2"));
                }
            }
            return sb.tostring();
        }