How to to set partition key for third-party cookies in c#?

Question

How to bypass third party cookies in C#? Now cookies are set with Response.Cookies.Append and cookieOptions like this:

Response.Cookies.Append("SomeCookie", "SomeValue", cookieOptions);

There is an instructions how to work around the third-party cookies at developer.chrome.com/docs/privacy-sandbox/chips/ - but this Partitioned property is not allowed in cookieOptions class. Is there any way to set custom keys-values for cookie using Response.Cookies.Append ?

Answer 1

As it is not yet supported in dot net, you can just append the Partitioned property to the Path option. For example:

Response.Cookies.Append("X-Access-Token", accessToken, new CookieOptions()
{
    HttpOnly = true,
    Secure = true,
    SameSite = SameSiteMode.None,
    Path = "/; samesite=None; Partitioned"
});

This code also includes a fix to ensure the option samesite=None is outputted into the cookie.