C＃許多異步HttpWebRequest

Question

我嘗試使許多異步HttpWebRequest 。 這是我的測試代碼：

class Program
{
    static void Main(string[] args)
    {
        Test();
        Console.ReadLine();
    }

    public static async void Test()
    {
        for (int i = 0; i < 10; i++)
        {
            int val = i;
            await Task.Run(() => WR(val));
        }
    }

    static async void WR(int msg)
    {
        Console.WriteLine(msg + " begin");

        string url = "https://stackoverflow.com";
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.Method = "GET";
        var response = (HttpWebResponse)await Task.Factory.FromAsync<WebResponse>
                (request.BeginGetResponse, request.EndGetResponse, null);

        Console.WriteLine(msg + " status code: " + response.StatusCode);
        Console.WriteLine(msg + " end");
    }
}

結果：

0 begin
1 begin
2 begin
3 begin
4 begin
5 begin
6 begin
7 begin
8 begin
9 begin
0 status code: OK
0 end
1 status code: OK
1 end

1 end什么也沒發生。 輸出大約30秒后，我可以看到：

The thread 0x6634 has exited with code 0 (0x0).
The thread 0x5620 has exited with code 0 (0x0).
The thread 0x4d08 has exited with code 0 (0x0).
The thread 0x39b8 has exited with code 0 (0x0).
The thread 0x3454 has exited with code 0 (0x0).
The thread 0x99c has exited with code 0 (0x0).
The thread 0x6be0 has exited with code 0 (0x0).

但是也沒有例外，並且控制台沒有關閉。

我的錯誤在哪里？

回答：

不記得response.Dispose();

Answer 1

我已經運行了您的代碼並獲得如下輸出：

0 begin
1 begin
2 begin
3 begin
4 begin
5 begin
6 begin
7 begin
8 begin
9 begin
0 status code: OK
0 end
5 status code: OK
5 end
8 status code: OK
8 end
4 status code: OK
4 end
3 status code: OK
3 end
2 status code: OK
2 end
6 status code: OK
6 end
1 status code: OK
1 end
7 status code: OK
7 end
9 status code: OK
9 end

當您按Enter鍵時，由於Console.ReadLine();應用程序將關閉Console.ReadLine(); 在您的主要方法中。 它等待程序，直到從控制台獲得輸入。

Answer 2

不記得response.Dispose();

static async void WR(int msg)
{
    Console.WriteLine(msg + " begin");

    string url = "https://stackoverflow.com";
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
    request.Method = "GET";
    var response = (HttpWebResponse)await Task.Factory.FromAsync<WebResponse>
            (request.BeginGetResponse, request.EndGetResponse, null);

    Console.WriteLine(msg + " status code: " + response.StatusCode);
    Console.WriteLine(msg + " end");
    response.Dispose();
}

Answer 3

我將其設置為自己的靜態方法，該方法將返回字符串，以便您了解發生了什么。 而且我不會依賴任何類型的xml文件，除非它是從API調用返回的XML。 我在這里發布，但如果需要，您可以獲取。 不知道您的設置在后端如何。 核實：

public static string PostXMLDataCS()
    {
        bool debugging = false;
        try
        {

            string iConnectAuth = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
  "<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:tem=\"http://tempuri.org/\">" +
            "<soapenv:Header/>" +
       "<soapenv:Body>" +
        "<tem:Authenticate>" +
         "<!--Optional:-->" +
          "<tem:TenantID>TenantID</tem:TenantID>" +
               "<!--Optional:-->" +
                "<tem:Username>Username</tem:Username>" +
                     "<!--Optional:-->" +
                      "<tem:Password>password</tem:Password>" +
                           "</tem:Authenticate>" +
                            "</soapenv:Body>" +
                             "</soapenv:Envelope>";

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://www.example.com/services/ByDesign/Inventory.svc");
            byte[] bytes;
            bytes = System.Text.Encoding.ASCII.GetBytes(iConnectAuth);

            request.ContentType = "text/xml; charset=utf-8";
            request.Accept = "gzip,deflate";
            request.ContentLength = bytes.Length;
            request.Method = "POST";
            request.Headers.Add("SOAPAction", "http://tempuri.org/IInventory/Authenticate");
            request.KeepAlive = true;

            Stream requestStream = request.GetRequestStream();
            requestStream.Write(bytes, 0, bytes.Length);
            requestStream.Close();
            HttpWebResponse response;
            response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                Stream responseStream = response.GetResponseStream();
                string responseStr = new StreamReader(responseStream).ReadToEnd();
                response.Close();
                //MessageBox.Show(responseStr);
                return responseStr;
            }
        }
        catch (Exception e)
        {
            if (debugging == true)
            {
                MessageBox.Show("There was a problem authenticating for the check inventory with iConnect. Error: " + e);
            }

            string messageSubject = "There was a problem authenticating for the check inventory with iConnect.";
            string messageBody = "There was a problem authenticating for the check inventory with iConnect. Error: ";
            string kiboSendEmail = string.Empty;
            SendEmail sendEmail = new SendEmail();
            return kiboSendEmail = sendEmail.SendEmailCS(messageSubject, messageBody, e);

        }
        return null;
    }