How to Fully Decode URL Parameters in C#?

Decoding URL Parameters in C#

HTTP requests often contain URL parameters that may be encoded for security reasons. To access these parameters in C#, you need to decode them first.

Method 1: Uri.UnescapeDataString

string encodedUrl = "my.aspx?val=%2Fxyz2F";
string decodedUrl = Uri.UnescapeDataString(encodedUrl);

Method 2: HttpUtility.UrlDecode

string decodedUrl = HttpUtility.UrlDecode(encodedUrl);

Both methods perform basic URL decoding, but a single call might not be sufficient. To fully decode the URL, you can use a while loop to repeatedly decode it until no further changes occur:

static string DecodeUrlString(string url) {
    string newUrl;
    while ((newUrl = Uri.UnescapeDataString(url)) != url)
        url = newUrl;
    return newUrl;
}

With this method, the provided URL would be fully decoded to "my.aspx?val=/xyz2F".

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