Question

我的代码如下：

 public static void sendData()
    {
        try
        {
            WebClient wc = new WebClient();
            var URI = new Uri("abc.com");
            string str = "data=1234";
            wc.Headers["Content-Type"] = "application/x-www-form-urlencoded";
            wc.UploadStringCompleted += new UploadStringCompletedEventHandler(wc__UploadStringCompleted);
            wc.UploadStringAsync(URI, "POST", str);
        }
        catch (Exception ex)
        {
            string temp = ex.Message;
        }
    }

   public static void wc__UploadStringCompleted(object sender, UploadStringCompletedEventArgs e)
    {

        try
        {
            string tt = e.Result;
        }

        catch (Exception exc)
        {

        }

    }

它是发送sucessfull到服务器，但它不能收集数据响应。请告诉我如何响应数据，我想在sendData方法得到响应不委托和wc__UploadStringCompleted不调用

Answer 1

public static async Task<string> sendData()
{
    TaskCompletionSource<string> complete = new TaskCompletionSource<string>();

    try
    {
        WebClient wc = new WebClient();
        var URI = new Uri("abc.com");
        string str = "data=1234";
        wc.Headers["Content-Type"] = "application/x-www-form-urlencoded";
        wc.UploadStringCompleted += (s, e) =>
        {
            try
            {
                string tt = e.Result;
                complete.SetResult(tttt);
            }
            catch (Exception exc)
            {
                complete.SetException(exc);
            }
        }
        wc.UploadStringAsync(URI, "POST", str);
    }
    catch (Exception ex)
    {
        string temp = ex.Message;
        complete.SetException(ex);
    }

    return await complete.Task;
}

用法：

public async void foo()
{
    string response = await sendData();
}

Answer 2

如果您的意思是，您希望在sendData()方法中进行响应，则可以在sendData()本身中连接处理程序。

wc.UploadStringCompleted += (s,e)=>
{
    try
    {
        string tt = e.Result;
    }

    catch (Exception exc)
    {

    }
}

无法从服务器接收响应？

2 个答案: