在 WebClient.UploadStringTaskAsync 之后获取响应 cookie

Question

WebClient重载后class

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 cookie

public 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!
    }
}

您觉得需要更多解释吗？
因为 Whosebug 警告说：
看起来你的 post 主要是代码；请添加更多详细信息。

Answer 1

我通过覆盖 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;
    }
}

在 WebClient.UploadStringTaskAsync 之后获取响应 cookie

Get response cookies after WebClient.UploadStringTaskAsync

c#

cookies

webclient

async-await