根据您的评论，您可以考虑编写扩展方法：

Based on your comments, you might consider writing an extension method:

public static bool TryAddCookie(this WebRequest webRequest, Cookie cookie)
{
    HttpWebRequest httpRequest = webRequest as HttpWebRequest;
    if (httpRequest == null)
    {
        return false;
    }

    if (httpRequest.CookieContainer == null)
    {
        httpRequest.CookieContainer = new CookieContainer();
    }

    httpRequest.CookieContainer.Add(cookie);
    return true;
}

然后，您可以输入以下代码：

Then you can have code like:

WebRequest webRequest = WebRequest.Create( uri );
webRequest.TryAddCookie(new Cookie("someName","someValue"));