具有大写十六进制字符的HttpUtility.UrlEncode

Question

HttpUtility.UrlEncode("abc : 123") produces abc+%3a+123 but I need it to produce abc+%3A+123 (notice the uppercase A .

Is there a way to have UrlEncode output uppercase hex characters?

I don't want to simply call .ToUpper() on the entire string because I need abc to stay lowercase.

Answer 1

This is not supported out of the box, but you can do it yourself:

private static string UrlEncodeUpperCase(string stringToEncode)
{
    var reg = new Regex(@"%[a-f0-9]{2}");
    stringToEncode = HttpUtility.UrlEncode(stringToEncode);
    return reg.Replace(stringToEncode, m => m.Value.ToUpperInvariant());
}

Keep in mind that [RFC 3986][1] explicitly mentions that uppercase and lowercase are equivalent.

Answer 2

I believe I've found the answer from the 2nd answer in this question: https://stackoverflow.com/a/1148326/20471

The solution is to use Uri.EscapeDataString because it uses %20 for spaces instead of + and also uppercases the hex replacements.