问题
I have a URL like the following
http://mysite.com/default.aspx?q=%E1
Where %E1 is supposed to be á. When I call Request.QueryString from my C# page I receive
http://mysite.com/default.aspx?q=%ufffd
It does this for any accented character. %E1, %E3, %E9, %ED etc. all get passed as %ufffd. Normal encoded values (%2D, %2E, %27) all get passed correctly.
The config file already has the responseEncoding/requestEncoding in the globalization section set to UTF-8.
How could I read the correct values?
Please note that I'm not the one generating the query string and I have no control over it.
回答1:
While it's true that á is encoded as U+00E1, the UTF-8 encoding (which is relevant for URL parameters) is 0xC3 0xA1.
You can verify by called a Wikipedia entry on an accented letter, such as http://en.wikipedia.org/wiki/%C3%81
U+FFFD is the Unicode Replacement Character which indicates the a given character value cannot be correctly encoded in Unicode.
Update:
Your question has two points.
First: How do I encode a Unicode string as parameter. Use
"?q=" + HttpUtility.UrlEncode(value)
Second: How do I retrieve a Unicode value? Use:
Request["q"]
If you receive the %E1 from some other source you do not control, maybe the RawUrl can help you. (I have not tried)
来源：https://stackoverflow.com/questions/14327085/querystring-converting-e1-to-ufffd