c# - 在 HttpWebRequest 中提交请求后无法执行此操作

Question

我在以下代码中遇到错误。

HttpWebRequest webRequest = WebRequest.Create(URL) as HttpWebRequest;
webRequest.CookieContainer = cookies;
StreamReader responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream());
HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse();
response.Cookies = webRequest.CookieContainer.GetCookies(webRequest.RequestUri); //Error here
string responseData = responseReader.ReadToEnd();
responseReader.Close();

Error : System.InvalidOperationException: This operation cannot be performed after the request has been submitted. at System.Net.HttpWebRequest.GetResponse()

上面的代码有什么问题？

Answer 1

HttpWebResponse.Cookies Property应该已经包含与响应关联的 cookie。

您还应该避免多次调用 GetResponse。

var cookies = new CookieContainer();

HttpWebRequest webRequest = WebRequest.Create(URL) as HttpWebRequest;
webRequest.CookieContainer = cookies;

var response = (HttpWebResponse)webRequest.GetResponse();

using (var responseReader = new StreamReader(response.GetResponseStream())) {
    var responseCookies = response.Cookies;
    string responseData = responseReader.ReadToEnd();
    //...
}

您可以为后续请求重用 cookie 容器，因为它们将由响应添加