无法将类型'void'隐式转换为'System.Net.CookieContainer'

Question

我只是想在我的webrequest中设置一个cookie但由于错误"无法将类型'void'隐式转换为'System.Net.CookieContainer'"而无法执行此操作.

如果下面的代码不起作用 - 你怎么做到这一点？

    public static string GET(string url, string cookieValue, string cookieName)
    {
        string response = "";
        Uri target = new Uri(url);
        var host = target.Host;
        Cookie c = new Cookie(cookieValue, cookieName) { Domain = host };
        CookieContainer cookieContainer = new CookieContainer().Add(c);
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Credentials = CredentialCache.DefaultCredentials;
        request.Method = "GET";
        request.CookieContainer = cookieContainer;
        WebResponse response1 = request.GetResponse();
        Stream dataStream = response1.GetResponseStream();
        StreamReader reader = new StreamReader(dataStream);

        response = reader.ReadToEnd();

        reader.Close();
        response1.Close();
        return response;
    }

Answer 1

您的表达式尝试"链接"实例创建new和调用Add.C#允许这样,但该表达式的结果类型是 Add返回类型,即void不能分配给任何东西.

你需要分开这一行

CookieContainer cookieContainer = new CookieContainer().Add(c);

分为两个:

CookieContainer cookieContainer = new CookieContainer();
cookieContainer.Add(c);

或使用{- }语法进行调用Add:

CookieContainer cookieContainer = new CookieContainer {
    c
};