c# - Dynamicly showing file contents in textbox [WPF] -
im building wpf application in have textbox, problem textbox needs contents of file text, txt file keeps getting written too.
i have made class handle this:
public class chathandler { public filestream stream; streamwriter writer; streamreader reader; public chathandler() { stream = new filestream(@"chat/" + datetime.today.tostring("d") + ".txt", filemode.openorcreate, fileaccess.readwrite, fileshare.readwrite); writer = new streamwriter(stream); reader = new streamreader(stream); } public void write(string line) { writer.writelineasync(line); writer.flush(); } public string read() { string tmp = ""; string line; while((line = reader.readline()) != null){ tmp += line + '\n'; } return tmp; } } and have user control has textbox:
public partial class chatscreen : usercontrol { mainwindow parent; chathandler chathandler; backgroundworker worker; public chatscreen() { initializecomponent(); chathandler = new chathandler(); worker = new backgroundworker(); worker.workersupportscancellation = true; worker.dowork += new doworkeventhandler(run); } private void load() { } private void write(string text) { if (chat.text != text && text != "") { chat.text = text; } } private void run(object sender, doworkeventargs e) { backgroundworker bg = sender backgroundworker; while (!bg.cancellationpending) { chat.dispatcher.begininvoke((action)(()=>{ write(parent.handler.read()); })); thread.sleep(100); } } private void chat_loaded(object sender, routedeventargs e) { parent = (mainwindow)window.getwindow(this); if (!worker.cancellationpending) { worker.runworkerasync(); } } private void chat_unloaded(object sender, routedeventargs e) { worker.cancelasync(); } } but problem occurs: text never changed, gets set once , never changed @ anymore :( eventhough in text file lines getting added.
the content of xaml file are:
<usercontrol x:class="tantibotv2.chatscreen" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:ignorable="d" d:designheight="381" d:designwidth="641" loaded="chat_loaded" unloaded="chat_unloaded"> <grid style="{staticresource contentroot}"> <scrollviewer horizontalscrollbarvisibility="disabled" verticalscrollbarvisibility="visible"> <textbox isreadonly="true" margin="0,0,0,0" textwrapping="wrap" name="chat" isreadonlycaretvisible="false"/> </scrollviewer> </grid> </usercontrol> can please me problem?
i cannot reproduce exact problem, problem new text in text file appears. because streamreader member variable , forward reader. can fix doing:
public string read() { using (var stream = new filestream(@"chat.txt", filemode.openorcreate, fileaccess.readwrite, fileshare.readwrite)) { using (var reader = new streamreader(stream)) { string tmp = ""; string line; while ((line = reader.readline()) != null) { tmp += line + '\n'; } return tmp; } } } edit: after problem clarified bit more:
xaml:
<grid> <grid.columndefinitions> <columndefinition></columndefinition> <columndefinition></columndefinition> </grid.columndefinitions> <grid.rowdefinitions> <rowdefinition height="*"></rowdefinition> </grid.rowdefinitions> <dockpanel grid.column="0" lastchildfill="true"> <label dockpanel.dock="top">irc channel simulator</label> <button dockpanel.dock="top" click="button_click">send chat</button> <scrollviewer horizontalscrollbarvisibility="disabled" verticalscrollbarvisibility="visible"> <textbox background="aliceblue" acceptsreturn="true" margin="0,0,0,0" textwrapping="wrap" name="chatwriter" isreadonlycaretvisible="false" /> </scrollviewer> </dockpanel> <scrollviewer grid.column="1" horizontalscrollbarvisibility="disabled" verticalscrollbarvisibility="visible"> <textbox isreadonly="true" margin="0,0,0,0" textwrapping="wrap" name="chat" isreadonlycaretvisible="false"/> </scrollviewer> </grid> code behind xaml:
public partial class mainwindow : window { chathandler chathandler; backgroundworker worker; public mainwindow() { initializecomponent(); chathandler = new chathandler(); worker = new backgroundworker(); worker.workersupportscancellation = true; worker.dowork += new doworkeventhandler(run); } private void write(string text) { if (chat.text != text && text != "") { chat.text = text; } } private void run(object sender, doworkeventargs e) { backgroundworker bg = sender backgroundworker; while (!bg.cancellationpending) { chat.dispatcher.begininvoke((action)(() => { write(chathandler.read()); })); thread.sleep(100); } } private void chat_loaded(object sender, routedeventargs e) { if (!worker.cancellationpending) { worker.runworkerasync(); } } private void chat_unloaded(object sender, routedeventargs e) { worker.cancelasync(); } private void button_click(object sender, routedeventargs e) { chathandler.write(chatwriter.text); } } chathandler.cs
public class chathandler { public filestream stream; //streamwriter writer; //streamreader reader; public chathandler() { stream = new filestream(@"chat.txt", filemode.openorcreate, fileaccess.readwrite, fileshare.readwrite); //writer = new streamwriter(stream); //reader = new streamreader(stream); } public void write(string line) { using (var filestream = new filestream(@"chat.txt", filemode.append, fileaccess.write, fileshare.readwrite)) { using (var writer = new streamwriter(filestream)) { writer.writelineasync(line); writer.flush(); } } } public string read() { using (var filestream = new filestream(@"chat/" + datetime.today.tostring("d") + ".txt", filemode.open, fileaccess.read, fileshare.readwrite)) { using (var reader = new streamreader(filestream)) { string tmp = ""; string line; while ((line = reader.readline()) != null) { tmp += line + '\n'; } return tmp; } } } }
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