无法从线程任务 <bool> 转换为系统操作

Question

我对运行按钮中的任务有疑问问题是：无法从 threading.task.task 转换为系统操作我在按钮中标记了行

         private async void BtnStart_Click(object sender, EventArgs e)
         {

        if (String.IsNullOrEmpty( txtProxy.Text) || lstviewcomp.Items.Count==0)
        {
            MessageBox.Show("Please uploads files");
            return;
        }
        proxies = txtProxy.Text.Split('\n');
        proxycount = proxies.Length;
        foreach (string item in lstviewcomp.Items)
        {
            proxycount++;
            if (proxyCounter> proxycount)
            {
                proxyCounter = 0;
            }
            ProxyInfo = proxies[proxyCounter].Split(',');
            var result = await Task.Run( MainAsync("", "", "", "", "", "")).GetAwaiter().GetResult();// Problem in this line 


            // proxyCounter++;
        }
    }


public async Task MainAsync(string instausername,string pass,string proxyip,string proxyport,string proxyusername,string proxypass)
        {
            try
            {
                // create user session data and provide login details
                var userSession = new UserSessionData
                {
                    UserName = instausername,
                    Password = pass
                };
                // create proxy handeler
                var httpHndler = new HttpClientHandler();
                IWebProxy proxy = new WebProxy(proxyip,Convert.ToInt32(proxyport));
                proxy.Credentials = new NetworkCredential(proxyusername, proxypass);
                httpHndler.Proxy = proxy;
                // create new InstaApi instance using Builder
                _instaApi = new InstaApiBuilder()
                    .SetUser(userSession)
                    .UseHttpClientHandler(httpHndler)
                    .UseLogger(logger: new DebugFileLogger()) // use logger for requests and debug messages
                    .SetRequestDelay(TimeSpan.FromSeconds(1)) // set delay between requests
                    .Build();

            // login
            txtLog.Text = txtLog.Text + $"Logging in as {userSession.UserName}"+" At "+DateTime.Now+"\n";
            var logInResult = await _instaApi.LoginAsync();
            if (!logInResult.Succeeded)
            {
                txtLog.Text = txtLog.Text + $"Unable to login: {logInResult.Info.Message}" + " At " + DateTime.Now + "\n";

            }
            else
            {
                txtLog.Text = txtLog.Text + $"Logging in success : {userSession.UserName}" + " At " + DateTime.Now + "\n";

            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex);
        }
        finally
        {
            var logoutResult = Task.Run(() => _instaApi.LogoutAsync()).GetAwaiter().GetResult();
            if (logoutResult.Succeeded) txtLog.Text = txtLog.Text + "Logout sucess \n";

        }
        return false;
    }

Answer 1

public async Task MainAsync

应该改为

public async Task<bool> MainAsync

然后代替

var result = await Task.Run( MainAsync("", "", "", "", "", "")).GetAwaiter().GetResult();

你可以使用

var result = await MainAsync("", "", "", "", "", "");

您还需要在以下行中使用 async:

var logoutResult = Task.Run(() => _instaApi.LogoutAsync()).GetAwaiter().GetResult();

变为：

var logoutResult = await _instaApi.LogoutAsync();

Answer 2

Task.Run取Func<Task>或Action（当然你可以额外传CancellationToken）。因此，对于您的情况，您需要传递一个 returns 任务并且不会尝试等待 void 的函数（我希望您记住您不能等待 void）。刚得到任务结果：

Task.Run(() => MainAsync("", "", "", "", "", "")).GetAwaiter().GetResult();

您可以直接等待任务而不是上面的代码：

Task.Run(() => MainAsync("", "", "", "", "", "")).Wait();

但是，如果您想按任务结果异步继续您的工作流程，您的 MainAsync 应该 returns a Task<bool> 正如@Olexiy Sadovnikov 回答中指出的那样并等待返回的任务。

无法从线程任务 <bool> 转换为系统操作

cannot convert from threading task<bool> to system action

c#

task

threadpool