How do I Decode URL Parameters in C#?

Decoding URL Parameters in C#

Decoding encoded URL parameters is a common task when working with web applications. In C#, there are multiple ways to decode parameters, depending on the specific requirements.

One method is to use the Uri.UnescapeDataString method. This method takes an encoded URL parameter and attempts to decode it. For example:

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

Another option is to use the HttpUtility.UrlDecode method. This method provides similar functionality to Uri.UnescapeDataString.

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

It's important to note that URL parameters may be encoded multiple times. To fully decode a parameter, you may need to call Uri.UnescapeDataString or HttpUtility.UrlDecode in a loop until the parameter is no longer decoded. Here's an example of a loop for fully decoding a parameter:

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

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