HttpUtility.UrlDecode turns + into space, but I ne

问题:

I'm using HttpUtility.UrlEncode to turn parameter value which concluds '+' to safe string deliverd among pages, so it turns '+' into %2b, but when I use Decode method it give me back a space. Why?

回答1:

Decoding %2b would give you back a +, but decoding a + would give you back a space.

So, most likely your string is decoded twice. If you are reading it from the Request.Querystring collection, then it's already decoded, so you shouldn't decode it again.

回答2:

Weird, the following prints + on my console (as expected):

Console.WriteLine(HttpUtility.UrlDecode(HttpUtility.UrlEncode("+")));