{"id":5481,"date":"2022-08-29T00:48:42","date_gmt":"2022-08-28T19:18:42","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-why-is-the-windows-forms-ui-blocked-when-executing-task-with-continuewith\/"},"modified":"2022-08-29T00:48:42","modified_gmt":"2022-08-28T19:18:42","slug":"solved-why-is-the-windows-forms-ui-blocked-when-executing-task-with-continuewith","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-why-is-the-windows-forms-ui-blocked-when-executing-task-with-continuewith\/","title":{"rendered":"[Solved] Why is the Windows Forms UI blocked when executing Task with ContinueWith?"},"content":{"rendered":"

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Since you already create (and save) your tasks, the easiest fix would be to await them for each iteration of your while loop:<\/p>\n

while (run)\n{\n    action2();\n\n    foreach (Task t in continutask)\n        await t;\n}\n<\/code><\/pre>\n
That way, when all pings completed (successful or not) you start the entire process again – without delay.<\/p>\n
One more thing: You could add a textBox1.ScrollToEnd();<\/code> to PrintResult<\/code><\/p>\n
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Since there is a lot of room for improvement, below is a rewritten and simplified example. I’ve removed a lot of unused variables (e.g. seqnum<\/code>) and made the PingStart<\/code> method completely asynchronous. I also replaced your ListBox with a TextBox for easier testing, so you might want to revert that in your code.<\/p>\n
This still isn’t the cleanest<\/em> of all possible implementations (mainly because of the global run<\/code>) but it should show you how to do things “more async”<\/em> \ud83d\ude42<\/p>\n
private async void buttonStart_Click(object sender, EventArgs e)\n{\n    \/\/ If the ping loops are already running, don't start them again\n    if (run)\n        return;\n\n    run = true;\n\n    \/\/ Get all IPs (in my case from a TextBox instead of a ListBox\n    string[] ips = txtIPs.Text.Split(new[] {\"\\r\\n\"}, StringSplitOptions.RemoveEmptyEntries);\n\n    \/\/ Create an array to store all Tasks\n    Task[] pingTasks = new Task[ips.Length];\n\n    \/\/ Loop through all IPs\n    for(int i = 0; i < ips.Length; i++)\n    {\n        string ip = ips[i];\n\n        \/\/ Launch and store a task for each IP\n        pingTasks[i] = Task.Run(async () =>\n            {\n                \/\/ while run is true, ping over and over again\n                while (run)\n                {\n                    \/\/ Ping IP and wait for result (instead of storing it an a global array)\n                    var result = await PingStart(ip);\n\n                    \/\/ Print the result (here I removed seqnum)\n                    PrintResult(result.Item2);\n\n                    \/\/ This line is optional. \n                    \/\/ If you want to blast pings without delay, \n                    \/\/ you can remove it\n                    await Task.Delay(1000);\n                }\n            }\n        );\n    }\n\n    \/\/ Wait for all loops to end after setting run = false.\n    \/\/ You could add a mechanism to call isPing.SendAsyncCancel() instead of waiting after setting run = false\n    foreach (Task pingTask in pingTasks)\n        await pingTask;\n}\n\n\/\/ (very) simplified explanation of changes:\n\/\/ async = this method is async (and therefore awaitable)\n\/\/ Task<> = This async method returns a result of type ...\n\/\/ Tuple<bool, string> = A generic combination of a bool and a string\n\/\/ (-)int seqnum = wasn't used so I removed it\nprivate async Task<Tuple<bool, string>> PingStart(string ip)\n{\n    Ping isPing = new Ping();\n    const int timeout = 2000;\n    const string data = \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\";\n    var buffer = Encoding.ASCII.GetBytes(data);\n    PingOptions options = new PingOptions {DontFragment = false};\n\n    \/\/ await SendPingAsync = Ping and wait without blocking\n    PingReply reply = await isPing.SendPingAsync(ip, timeout, buffer, options);\n    string rtt = reply.RoundtripTime.ToString();\n\n    bool success = reply.Status == IPStatus.Success;\n    string text;\n\n    if (success)\n    {\n        text = $\"{ip}\" + \" Success!\" + $\" rtt: [{rtt}]\" + $\"Thread: {Thread.CurrentThread.GetHashCode()} Is pool thread: {Thread.CurrentThread.IsThreadPoolThread}\";\n    }\n    else\n    {\n        text = $\"{ip}\" + $\" Not Successful! Status: {reply.Status}\" + $\"Thread: {Thread.CurrentThread.GetHashCode()} Is pool thread: {Thread.CurrentThread.IsThreadPoolThread}\";\n    }\n\n    \/\/ return if the ping was successful and the status message\n    return new Tuple<bool, string>(success, text);\n}\n<\/code><\/pre>\n
This way you will have a loop for each IP that will continue independently of each other until run<\/code> is set to false<\/code>.<\/p>\n<\/p><\/div>\n
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            8<\/span> <\/p><\/div>\n<\/div>\n
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solved Why is the Windows Forms UI blocked when executing Task with ContinueWith? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Since you already create (and save) your tasks, the easiest fix would be to await them for each iteration of your while loop: while (run) { action2(); foreach (Task t in continutask) await t; } That way, when all pings completed (successful or not) you start the entire process again – without delay. One … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[1395,324,1396,1394,959],"class_list":["post-5481","post","type-post","status-publish","format-standard","hentry","category-solved","tag-blocked","tag-c","tag-continuewith","tag-task-parallel-library","tag-winforms"],"yoast_head":"\n[Solved] Why is the Windows Forms UI blocked when executing Task with ContinueWith? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-why-is-the-windows-forms-ui-blocked-when-executing-task-with-continuewith\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Why is the Windows Forms UI blocked when executing Task with ContinueWith? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Since you already create (and save) your tasks, the easiest fix would be to await them for each iteration of your while loop: while (run) { action2(); foreach (Task t in continutask) await t; } That way, when all pings completed (successful or not) you start the entire process again – without delay. One ... 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