问题描述
在重载WebClient类之后
public class CustomWebClient : WebClient
{
public CustomWebClient()
{
Cookies = new CookieCollection();
CookieContainer = new CookieContainer();
}
public CookieContainer CookieContainer { get; }
public CookieCollection Cookies { get; private set; }
protected override WebRequest GetWebRequest(Uri address)
{
var request = (HttpWebRequest)base.GetWebRequest(address);
request.CookieContainer = CookieContainer;
return request;
}
protected override WebResponse GetWebResponse(WebRequest request)
{
var response = (HttpWebResponse)base.GetWebResponse(request);
Cookies = response.Cookies;
return response;
}
}
我可以使用client.UploadString
获取Cookiepublic string test()
{
using (var client = new CustomWebClient())
{
//...
client.UploadString("example.com","json");
return client.Cookies
}
}
但是如何使用client.UploadStringTaskAsync获取cookie?
public async Task<string> test()
{
using (var client = new CustomWebClient())
{
//...
await client.UploadStringTaskAsync("example.com","json");
return client.Cookies // There are no cookies!
}
}
您是否需要更多说明?
因为stackoverflow警告:
看起来您的帖子大部分是代码;请添加更多详细信息。
解决方法
我通过重写GetWebResponse(WebRequest请求,IAsyncResult结果)解决了这个问题
public class CustomWebClient : WebClient
{
public CustomWebClient()
{
Cookies = new CookieCollection();
CookieContainer = new CookieContainer();
}
public CookieContainer CookieContainer { get; }
public CookieCollection Cookies { get; private set; }
protected override WebRequest GetWebRequest(Uri address)
{
var request = (HttpWebRequest)base.GetWebRequest(address);
request.CookieContainer = CookieContainer;
return request;
}
protected override WebResponse GetWebResponse(WebRequest request)
{
var response = (HttpWebResponse)base.GetWebResponse(request);
Cookies = response.Cookies;
return response;
}
protected override WebResponse GetWebResponse(WebRequest request,IAsyncResult result)
{
var response = (HttpWebResponse)base.GetWebResponse(request);
Cookies = response.Cookies;
return response;
}
}