C# 将CookieContainer与WebClient类一起使用
我以前在HttpWebRequest和HttpWebResponse会话中使用过CookieContainer,但现在,我想在WebClient中使用它。据我所知,没有像HttpWebRequests(C# 将CookieContainer与WebClient类一起使用,c#,cookies,httpwebrequest,webclient,cookiecontainer,C#,Cookies,Httpwebrequest,Webclient,Cookiecontainer,我以前在HttpWebRequest和HttpWebResponse会话中使用过CookieContainer,但现在,我想在WebClient中使用它。据我所知,没有像HttpWebRequests(request.CookieContainer)那样的内置方法如何从CookieContainer中的网络客户端收集cookie? 我对此进行了调查,并发现: 这是最好的方法吗?是的。总之,重写GetWebRequest()是解决WebClient有限功能的最佳解决方案。在我了解这个选项之前,我在
request.CookieContainer
)那样的内置方法如何从CookieContainer中的网络客户端收集cookie?
我对此进行了调查,并发现:
这是最好的方法吗?是的。总之,重写GetWebRequest()是解决WebClient有限功能的最佳解决方案。在我了解这个选项之前,我在HttpWebRequest层编写了很多非常痛苦的代码,因为WebClient几乎完成了我所需要的,但不是完全完成了。推导要容易得多 另一个选项是使用常规WebClient类,但在发出请求之前手动填充Cookie头,然后在响应上拉出Set Cookie头。CookieContainer类上有一些帮助器方法,它们使创建和解析这些头文件变得更容易:分别是和 我更喜欢前一种方法,因为它比第二种方法对调用方更容易,并且需要的重复代码更少。此外,派生方法对多个可扩展性场景(例如cookie、代理等)的工作方式相同 来自评论
如何设置cookie的名称和值的格式以代替“somecookie” 对于多个cookie:
wb.Headers.Add(HttpRequestHeader.Cookie,
"cookiename1=cookievalue1;" +
"cookiename2=cookievalue2");
这只是你找到的文章的延伸
public class WebClientEx : WebClient
{
public WebClientEx(CookieContainer container)
{
this.container = container;
}
public CookieContainer CookieContainer
{
get { return container; }
set { container= value; }
}
private CookieContainer container = new CookieContainer();
protected override WebRequest GetWebRequest(Uri address)
{
WebRequest r = base.GetWebRequest(address);
var request = r as HttpWebRequest;
if (request != null)
{
request.CookieContainer = container;
}
return r;
}
protected override WebResponse GetWebResponse(WebRequest request, IAsyncResult result)
{
WebResponse response = base.GetWebResponse(request, result);
ReadCookies(response);
return response;
}
protected override WebResponse GetWebResponse(WebRequest request)
{
WebResponse response = base.GetWebResponse(request);
ReadCookies(response);
return response;
}
private void ReadCookies(WebResponse r)
{
var response = r as HttpWebResponse;
if (response != null)
{
CookieCollection cookies = response.Cookies;
container.Add(cookies);
}
}
}
我认为有一种更干净的方法,您不必创建新的webclient(它也可以与第三方库一起使用) 现在,您只需选择要使用的域:
WebRequest.RegisterPrefix("http://example.com/", MyWebRequestCreator.MyHttp);
这意味着进入example.com的任何webrequest现在都将使用您的自定义webrequest创建者,包括标准webclient。这种方法意味着您不必接触所有代码。只需调用寄存器前缀一次,即可完成操作。
您还可以注册“http”前缀以选择所有内容。HttpWebRequest修改分配给它的CookieContainer。不需要处理返回的cookies。只需将cookie容器分配给每个web请求
public class CookieAwareWebClient : WebClient
{
public CookieContainer CookieContainer { get; set; } = new CookieContainer();
protected override WebRequest GetWebRequest(Uri uri)
{
WebRequest request = base.GetWebRequest(uri);
if (request is HttpWebRequest)
{
(request as HttpWebRequest).CookieContainer = CookieContainer;
}
return request;
}
}
如何设置cookie的名称和值的格式以代替“somecookie”?@Neil N:wb.Headers.Add(HttpRequestHeader.cookie,“cookiename=cookievalue”);对于多个Cookie:wb.Headers.Add(HttpRequestHeader.Cookie,“cookiename1=cookievalue1;cookiename2=cookievalue2”);这对我来说是最简单的方法,将cookie从Anglesharp传输到WebClient,以获得下载链接:-)谢谢!这在@Pavel中运行得很好,不过您可以通过展示如何使用类的功能来改进这个答案,特别是设置和获取cookies。Thx用于扩展。为了使用它,我添加了公共CookieContainer CookieContainer{get{return{U container;}set{U container=value;}}@IgorShubin您必须删除
container
字段的只读
修饰符,否则无法在属性中设置它。我修改了代码。你不应该检查ReadCookies
中的Set Cookie
响应头吗?你实际上不需要GetWebResponse
和ReadCookies
,因为cookies会自动添加到容器中。在我看来,m_container
从未设置过!?它不是总是空的吗?我相信HttpWebRequest类会根据需要使用其内部字段CookieContainer来修改m_容器类。这就是您所需要的!来自回复的cookies将自动添加到容器中;声明:“默认情况下,HttpWebRequest类注册为HTTP和HTTPS方案的服务请求。尝试为这些方案注册其他WebRequest子代将失败。”
public class WebClientEx : WebClient
{
public WebClientEx(CookieContainer container)
{
this.container = container;
}
public CookieContainer CookieContainer
{
get { return container; }
set { container= value; }
}
private CookieContainer container = new CookieContainer();
protected override WebRequest GetWebRequest(Uri address)
{
WebRequest r = base.GetWebRequest(address);
var request = r as HttpWebRequest;
if (request != null)
{
request.CookieContainer = container;
}
return r;
}
protected override WebResponse GetWebResponse(WebRequest request, IAsyncResult result)
{
WebResponse response = base.GetWebResponse(request, result);
ReadCookies(response);
return response;
}
protected override WebResponse GetWebResponse(WebRequest request)
{
WebResponse response = base.GetWebResponse(request);
ReadCookies(response);
return response;
}
private void ReadCookies(WebResponse r)
{
var response = r as HttpWebResponse;
if (response != null)
{
CookieCollection cookies = response.Cookies;
container.Add(cookies);
}
}
}
internal static class MyWebRequestCreator
{
private static IWebRequestCreate myCreator;
public static IWebRequestCreate MyHttp
{
get
{
if (myCreator == null)
{
myCreator = new MyHttpRequestCreator();
}
return myCreator;
}
}
private class MyHttpRequestCreator : IWebRequestCreate
{
public WebRequest Create(Uri uri)
{
var req = System.Net.WebRequest.CreateHttp(uri);
req.CookieContainer = new CookieContainer();
return req;
}
}
}
WebRequest.RegisterPrefix("http://example.com/", MyWebRequestCreator.MyHttp);
public class CookieAwareWebClient : WebClient
{
public CookieContainer CookieContainer { get; set; } = new CookieContainer();
protected override WebRequest GetWebRequest(Uri uri)
{
WebRequest request = base.GetWebRequest(uri);
if (request is HttpWebRequest)
{
(request as HttpWebRequest).CookieContainer = CookieContainer;
}
return request;
}
}