Decipher encoded parameters utilizing the JavaScript encodeURIComponent method

I'm dealing with an issue in my application where text entered by a user is sent to the server as part of a URL to render an image. The text is encoded using the encodeURIComponent function, but I'm running into problems with certain characters like + or foreign characters.

For instance, if the input is "François + Anna", the resulting encoded URL looks like previewImage.ashx?id=1&text=Fran%25E7ois%2520%2B%2520Anna

When trying to decode this on the server using Uri.UnescapeDataString, I get an "Invalid URI: There is an invalid sequence in the string." error. If I remove the extended character, it decodes as "Francois + Anna".

Alternatively, using HttpUtility.UrlDecode with UTF8Encoding.UTF7, the foreign characters are decoded correctly but the encoded + becomes a space, resulting in "François   Anna".

javascriptc#asp.net.netencoding

Answer №1

The initial URL encoding was incorrect. The correct URL encoding for "François + Anna" should be 

previewImage.ashx?id=1&text=Fran%E7ois+%2B+Anna
or 
previewImage.ashx?id=1&text=Fran%E7ois%20%2B%20Anna

To fix the encoding issue, simply update the URL encoding as mentioned above. Once corrected, you can easily retrieve the result by using 

Context.Request.QueryString["text"]
. No additional steps are necessary.

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