c# - Synchronizing sub-thread with main thread - not so obvious problem -


Honestly, I'm a little lame when it comes to threading;) Then I'm asking a little help.

Suppose we have some kind of control on which we can draw some charts. There is also a method that pulls the chart on this control. The problem is that the charting system is only for one of the areas of control and when the chart is ready, we need to refresh the control.

So assume that our control looks like this: 

  Class Charting Control: System. Windows .form. Control {public canvas canvas; Public Zero Refresh (); / * ... other fields / methods * /}

where canvas is a class to attract the image (something like graphics).
Charting method is used only for canvas objects (we can not change this), so it looks like this: 

  Public stateless draw chart (Canvas) {/ * Draw This method can be called from a different thread, background worker etc ... and I have to synchronize it with the main thread and call  refresh ()  when the chart is ready it happens. 
 
 Now when the chart is ready, then I set a flag on the canvas object 
 
  public status blank draft drawer (canvas) {/ * draw * / canvas .Tag = true; // chart is ready}  
 
 and I have a background worker running inside the charting control and if the  canvas.Tag  field has changed and is listening , Call this  refresh ()  
 
 but it seems that my method is a little less, easy-fail etc. ... is there any better way to improve it? 
 
 Limitations: 
 - We can not modify the  canvas  category. What we can use is the  tag  field (type  object  
 - we can modify the  chartingcontroll  class and drawing method 
 - There may be many charting controls - we do not have any control over how called  Draw Chart . It can be said in a separate thread, or not. It is said to build control and drawarty method and earn them somehow. Shish 
 
  Solution  
 OK, I sorted it out like this:  Charting Control  I created a  manual reset event manual reset < / Code> and background worker. 
 
 Bacground worker  manual reset : 
 
  is waiting for zero background Worker_DoWork (object sender , System.ComponentModel.DoWorkEventArgs e) {manualReset.WaitOne (); // Wait for a chart to be completed}  
 
 and finally call the reset method () Switch to 
 
  void Prishtbhumivrkr_runwack full (object sender, System.Co Monpenntmodel. Runwalkeruplicated avantarges e) {refresh (); }  
 
 I place the manual code  inside  canvas tags and drawing method, when the chart is ready, then I  Reset the manual reset .set ();

OK, I like it to pass the signal to prepare the chart Resolved: In the Charting Control I Manual ResetEvent manualReset and background worker.

ManualReset.WaitOne (); // Wait for a chart to be completed}

and finally reset () method 

  zero background worker_recognized full (object sender, System.ComponentModel call ) RunWorkerCompletedEventArgs e) {refresh (); }

I place the manual code inside canvas tags and drawing method, when the chart is ready, then I Reset the manual reset .set (); to pass the signal to prepare the chart


-

Comments

Post a Comment

Popular posts from this blog

Eclipse CDT variable colors in editor -

I hope this is a good question to ask here. This programming is related, so I thought it would be better than the superuser, so I am using the CDT C ++ Eclipse plugin. I know how the editor changes colors for some things But is there a way to do that all the variables are different colors? For example in KDEValue, it sets the local variables and square variables in different colors and bold square squares. Can I copy it to CDT? Eclips provides some level of color customization for text editor syntax You can see it on the following: There are many elements, including the Window> Preferences> C / C ++> Editor> Syntax color code that can be changed, assembly, Comments, Preprocessor and Doxian Under the code, it is possible to change the color of some variable types, such as global variables, local variable announcements, local variable references, and parameter variables. But I do not think the code is capable of changing the color of each variable declared....
Read more

AJAX doesn't send POST query -

$ (दस्तावेज़) .ready (function () {function ajaxselectrss (rssurlvar) {var ajaxRequest; // वेरिएबल जो अजाक्स को संभव बनाता है! कोशिश करें कि {// ओपेरा 8.0+, फ़ायरफ़ॉक्स, सफारी अजाक्स अनुरोध} = नया एक्सएमएलएचटीपीआरइवेस्ट ();} कैच (ई) {// इंटरनेट एक्सप्लोरर ब्राउज़र्स {ajaxRequest = new ActiveXObject ("Msxml2.XMLHTTP");} पकड़ो (ई) {try {ajaxRequest = new ActiveXObject ("Microsoft.XMLHTTP");} कैच (ई) {// कुछ गलत चेतावनी ("आपका ब्राउज़र तोड़ दिया!"); वापसी झूठी;}}} // एक बनाएं फ़ंक्शन जो सर्वर से भेजे गए डेटा प्राप्त करेंगे ajaxRequest.onreadystatechange = function () {if (ajaxRequest.readyState == 4) {var ajaxDisplay = document.getElementById ('news'); ajaxDisplay.innerHTML = ajaxRequest.responseText;}} / / Var rssurlvar = $ (this) .attr ("title"); var queryString = "rurl =" + rssurlvar; var urltofile = "rssget.php"; ajaxRequest.open ("पोस्ट", urltofile, सच); ajaxRequ Est.setRequestHeader ("सामग्री-प्र...
Read more

wpf - Custom Message Box Advice -

Well, I'm using a custom window box that comes with some custom control boxes that accompany the text The producers who are displayed are called. I have a defined event, which has been subscribed through the original class, it gets burnt when clicking on the button. However, I can not see how to use it effectively, I would like to return one yes, whether yes or not, but obviously my code will continue to execute, so this Below is some example code to clarify the problem that the method has subscibed by clicking on the button. Message box window Public partial class custom message box: window {public representative message messagebox object sender, event events e); Public event messagebox handler messagebox document; Public Customs Box () {Initial group (); } Public Customsbox (String Message) {InitializeComponent (); This.txtdescription.Text = Message; } Public Customsbox (String Message, String Title, String First BTNtext) {Initialization (); This.lbltitle.Content =...
Read more