{"id":102,"date":"2023-11-28T15:13:36","date_gmt":"2023-11-28T15:13:36","guid":{"rendered":"https:\/\/code.handwerkit.com\/?p=102"},"modified":"2025-02-20T14:29:28","modified_gmt":"2025-02-20T14:29:28","slug":"c-threads-mit-erbeniss-in-der-gui","status":"publish","type":"post","link":"https:\/\/code.handwerkit.com\/?p=102","title":{"rendered":"C# Threads und Anzeige in der GUI"},"content":{"rendered":"\n

Wir wollen Daten laden und nicht dass die Oberfl\u00e4che einfriert.
\u00dcber den Invoke Befehl kann z.B. eine WinForm Benutzerelement aktualisiert werden:<\/p>\n\n\n\n

\/\/Ein Button der den Thread startet:\nprivate void buttonTest_Click(object sender, EventArgs e)\n{\n            _TmfStart = DateTime.Now;\n            textBox1.Text = "Start loading...";\n            textBox1.AppendText(Environment.NewLine);        \n            textBox1.AppendText("Time: " + _TmfStart.ToString("mm ss f"));\n\n            var thread = new Thread(new ThreadStart(getLongRun));\n            thread.Start();\n }\n\n\nprivate void getLongRun()\n        {\n            using (var db = new DatabaseContext())\n            {\n                var opt = db.artikeldatenbank.Take(50).ToList();\n                this.Invoke((MethodInvoker)delegate\n                {\n                    \/\/here can change GUI without freeze\n                    dataGridView1.DataSource = opt;\n\n                    _TmfEnd = DateTime.Now;\n                    textBox1.AppendText(Environment.NewLine);\n                    textBox1.AppendText("Time: " + _TmfEnd.ToString("ss f"));\n                });\n            }\n        }\n<\/code><\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
weitere M\u00f6glichkeiten eines Threads im Hintergrund:<\/p>\n\n\n\n
 <\/p>\n\n\n\n
int ActivThreads = 0;\nstatic CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();\nstatic CancellationToken token = cancellationTokenSource.Token;\n\nprivate void button1ThreadStart_Click(object sender, EventArgs e)\n{            \n    TestBackgroundThread(token);\n}\n\nprivate void InvokeGUIThread(Action action)\n{\n    Invoke(action);\n}\n\nvoid TestBackgroundThread(CancellationToken cancelToken, bool bg = true)\n{\n    var thread = new Thread((ThreadStart)delegate ()\n    {\n        long count = 0;\n        while (true)\n        {\n            if (cancelToken.IsCancellationRequested)\n            {\n                return;\n            }\n            Thread.Sleep(Convert.ToInt32(textBox2.Text));\n            count++;\n            InvokeGUIThread(() =>\n            {\n                textBox1.AppendText(count.ToString() + Environment.NewLine);\n            });\n\n        }\n    });\n\n    \/\/ Choose one option:\n    thread.IsBackground = bg; \/\/ <--- This will make the thread run in background\n    \/*thread.IsBackground = false;*\/ \/\/ <--- This will delay program termination\n\n    thread.Start();\n    ActivThreads++;           \n}\n\nprivate void button1StopAll_Click(object sender, EventArgs e)\n{\n    cancellationTokenSource.Cancel();\n    ActivThreads = 0;\n    cancellationTokenSource = new CancellationTokenSource();\n    token = cancellationTokenSource.Token;\n}<\/code><\/pre><\/div>\n\n\n\n
\"\"<\/figure>
\n
Die GUI friert nicht ein, 
nach jedem Klick aus den Thread Start Button
wir ein neuer Thread gestartet und in der 
TextBox wird in ms der Counter gesteuert.

Bei einem Klick auf Stop werden \u00fcber
CancelationToken alle Threads gestoppt. <\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"
Wir wollen Daten laden und nicht dass die Oberfl\u00e4che einfriert.\u00dcber den Invoke Befehl kann z.B. eine WinForm Benutzerelement aktualisiert werden: weitere M\u00f6glichkeiten eines Threads im Hintergrund: Die GUI friert nicht ein, nach jedem Klick aus den Thread Start Buttonwir ein neuer Thread gestartet und in der TextBox wird in ms der Counter gesteuert. Bei einem … <\/p>\n
„C# Threads und Anzeige in der GUI“<\/span> weiterlesen<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34,3],"tags":[6,31],"class_list":["post-102","post","type-post","status-publish","format-standard","hentry","category-threads","category-winform","tag-c","tag-thread","entry"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"post-thumbnail":false},"uagb_author_info":{"display_name":"Rooout","author_link":"https:\/\/code.handwerkit.com\/?author=1"},"uagb_comment_info":3,"uagb_excerpt":"Wir wollen Daten laden und nicht dass die Oberfl\u00e4che einfriert.\u00dcber den Invoke Befehl kann z.B. eine WinForm Benutzerelement aktualisiert werden: weitere M\u00f6glichkeiten eines Threads im Hintergrund: Die GUI friert nicht ein, nach jedem Klick aus den Thread Start Buttonwir ein neuer Thread gestartet und in der TextBox wird in ms der Counter gesteuert. Bei einem…","_links":{"self":[{"href":"https:\/\/code.handwerkit.com\/index.php?rest_route=\/wp\/v2\/posts\/102","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/code.handwerkit.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/code.handwerkit.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/code.handwerkit.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/code.handwerkit.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=102"}],"version-history":[{"count":8,"href":"https:\/\/code.handwerkit.com\/index.php?rest_route=\/wp\/v2\/posts\/102\/revisions"}],"predecessor-version":[{"id":127,"href":"https:\/\/code.handwerkit.com\/index.php?rest_route=\/wp\/v2\/posts\/102\/revisions\/127"}],"wp:attachment":[{"href":"https:\/\/code.handwerkit.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/code.handwerkit.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/code.handwerkit.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}