How to Decode URL Parameters in C#?

Decoding Encoded URL Parameters in C#

When working with URLs in C#, it's often necessary to decode encoded parameters. For instance, in the URL my.aspx?val=/xyz2F, the parameter value /xyz2F is encoded and needs to be decoded to reveal its true value, which is /xyz2F.

To decode URL parameters in C#, there are two common approaches:

• Using Uri.UnescapeDataString():

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

  This method decodes the entire URL parameter string, including other encoded portions.

• Using HttpUtility.UrlDecode():

  string url = "my.aspx?val=%2Fxyz2F";
  string decodedUrl = HttpUtility.UrlDecode(url);

  This method decodes only the specific URL parameter value, not the entire URL.

In some cases, a URL may be multiply encoded. To fully decode such a URL string, you can use a loop, as shown below:

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

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