急急！请问如何将这个javascript代码改成C#，谢谢
这是一段javascript代码，请问如何把它改成C#，谢谢
function decode56(str){
var c1, c2, c3, c4,c5=[-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1],c6 = str.charCodeAt(0),c7,i, len, out;
if(!this['][']){
this[']['] = 1;
c7=this.decode56(str);
str = c7.substr(c6);
};
len = str.length;
i = 1;
out = "";
while(i < len) {
do {
c1 = c5[str.charCodeAt(i++) & 0xff];
} while(i < len && c1 == -1);
if(c1 == -1) break;
do {
c2 = c5[str.charCodeAt(i++) & 0xff];
} while(i < len && c2 == -1);
if(c2 == -1) break;
out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
do {
c3 = str.charCodeAt(i++) & 0xff;
if(c3 == 61) return out;
c3 = c5[c3];
} while(i < len && c3 == -1);
if(c3 == -1) break;
out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
do {
c4 = str.charCodeAt(i++) & 0xff;
if(c4 == 61) return out;
c4 = c5[c4];
} while(i < len && c4 == -1);
if(c4 == -1) break;
out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
}
return out;
}
[解决办法]
没有测试过，随手改写不能保证其正确率
private string decode56(string str){ int[] c5 = new int[] { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 }; char c6 = str[0]; int len = str.Length; int i = 1; string _out = string.Empty; int c1, c2, c3, c4; while (i < len) { do { c1 = c5[str[i++] & 0xff]; } while (i < len && c1 == -1); if (c1 == -1) break; do { c2 = c5[str[i++] & 0xff]; } while (i < len && c2 == -1); if (c2 == -1) break; _out += (char)((c1 << 2) | ((c2 & 0x30) >> 4)); do { c3 = str[i++] & 0xff; if (c3 == 61) return _out; c3 = c5[c3]; } while (i < len && c3 == -1); if (c3 == -1) break; _out += (char)((((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2))); do { c4 = str[i++] & 0xff; if (c4 == 61) return _out; c4 = c5[c4]; } while (i < len && c4 == -1); if (c4 == -1) break; _out += (char)(((c3 & 0x03) << 6) | c4); } return _out;}