I'm stuck trying to update a progressbar from other threads ran in a different class. To explain what I do I think a picture will be better. I want to update the progressbar in the //HERE point :
I've tried using a delegate, tried with ReportProgress and I think i've basically tried to use everything google reported in the first 100 results, without success. I'm still learning WPF and this might be silly way to proceed, i'm looking for a quick and dirty way to get the work done but feel free to tell me what I should redesign for a cleaner application.
EDIT : More code.
In ExecutorWindow.xaml.cs :
public void RunExecutor()
{
// CREATE BACKGROUNDWORKER FOR EXECUTOR
execBackground.DoWork += new DoWorkEventHandler(execBackground_DoWork);
execBackground.RunWorkerCompleted += new RunWorkerCompletedEventHandler(execBackground_RunWorkerCompleted);
execBackground.ProgressChanged += new ProgressChangedEventHandler(execBackground_ProgressChanged);
execBackground.WorkerReportsProgress = true;
execBackground.WorkerSupportsCancellation = true;
// RUN BACKGROUNDWORKER
execBackground.RunWorkerAsync();
}
private void execBackground_DoWork(object sender, DoWorkEventArgs e)
{
myExecutor = new Executor(arg1, arg2);
myExecutor.Run();
}
private void execBackground_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
MessageBox.Show("RunWorkerCompleted execBackground");
}
private void execBackground_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
ExecutorProgressBar.Value += 1;
}
// TESTING
private void updateProgressBar(int i)
{
ExecutorProgressBar.Value += i;
}
public delegate void callback_updateProgressBar(int i);
In Executor.cs :
public void Run()
{
string[] options = new string[2];
int i = 0;
while (LeftToRun > 0)
{
if (CurrentRunningThreads < MaxThreadsRunning)
{
BackgroundWorker myThread = new BackgroundWorker();
myThread.DoWork += new DoWorkEventHandler(backgroundWorkerRemoteProcess_DoWork);
myThread.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorkerRemoteProcess_RunWorkerCompleted);
myThread.ProgressChanged += new ProgressChangedEventHandler(backgroundWorkerRemoteProcess_ProgressChanged);
myThread.WorkerReportsProgress = true;
myThread.WorkerSupportsCancellation = true;
myThread.RunWorkerAsync(new string[2] {opt1, opt2});
// HERE ?
CurrentRunningThreads++;
i++;
LeftToRun--;
}
}
while (CurrentRunningThreads > 0) { }
logfile.Close();
MessageBox.Show("All Tasks finished");
}
private void backgroundWorkerRemoteProcess_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker myBackgroundWorker = sender as BackgroundWorker;
string[] options = (string[])e.Argument;
string machine = options[0];
string script = options[1];
// UPDATE HERE PROGRESSBAR ?
RemoteProcess myRemoteProcess = new RemoteProcess(machine, script);
string output = myRemoteProcess.TrueExec();
// UPDATE HERE PROGRESSBAR ?
this.logfile.WriteLine(output);
}
private void backgroundWorkerRemoteProcess_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
CurrentRunningThreads--;
}
private void backgroundWorkerRemoteProcess_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
//myExecWindow.ExecutorProgressBar.Value = e.ProgressPercentage; // TESTING
//ExecutorWindow.callback_updateProgressBar(1); // TESTING
}
EDIT 2 : I got it! Simple in fact, but i guess I've been looking too close to find out.
In my ExecutorWindow class :
private void execBackground_DoWork(object sender, DoWorkEventArgs e)
{
myExecutor = new Executor(arg1, arg2);
myExecutor.Run(sender);
}
private void execBackground_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
ExecutorProgressBar.Value += 1;
}
And in my Executor class :
private BackgroundWorker myExecutorWindow;
[...]
public void Run(object sender)
{
myExecutorWindow = sender as BackgroundWorker;
string[] options = new string[2];
int i = 0;
while (LeftToRun > 0)
{
if (CurrentRunningThreads < MaxThreadsRunning)
{
BackgroundWorker myThread = new BackgroundWorker();
myThread.DoWork += new DoWorkEventHandler(backgroundWorkerRemoteProcess_DoWork);
myThread.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorkerRemoteProcess_RunWorkerCompleted);
myThread.ProgressChanged += new ProgressChangedEventHandler(backgroundWorkerRemoteProcess_ProgressChanged);
myThread.WorkerReportsProgress = true;
myThread.WorkerSupportsCancellation = true;
myThread.RunWorkerAsync(new string[2] {opt1, opt2});
CurrentRunningThreads++;
i++;
LeftToRun--;
}
}
[...]
private void backgroundWorkerRemoteProcess_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker myBackgroundWorker = sender as BackgroundWorker;
myBackgroundWorker.ReportProgress(1);
// PROCESSING MY STUFF HERE
myBackgroundWorker.ReportProgress(1);
}
private void backgroundWorkerRemoteProcess_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
myExecutorWindow.ReportProgress(1);
}
Thank you !
You can run any method on the UI thread with this very basic sample
this.Dispatcher.Invoke(DispatcherPriority.Normal, new Action(delegate()
{
this.progressBar.Value= 20; // Do all the ui thread updates here
}));
Running commands inside the Dispatcher.Invoke(...), you can actually interact with the UI from any worker thread, where otherwise you would get an exception.
If you really need to have the ultimate control on the background threads & main (UI) thread updates, here is a fantastic tutorial on that: http://blog.decarufel.net/2009/03/good-practice-to-use-dispatcher-in-wpf.html
You should be able to use the Dispatcher.Invoke method
e.g.
Dispatcher.Invoke(
new System.Action(() => myProgressBar.Value = newValue)
);
I got it! Simple in fact, but i guess I've been looking too close to find out.
In my ExecutorWindow class :
private void execBackground_DoWork(object sender, DoWorkEventArgs e)
{
myExecutor = new Executor(arg1, arg2);
myExecutor.Run(sender);
}
private void execBackground_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
ExecutorProgressBar.Value += 1;
}
And in my Executor class :
private BackgroundWorker myExecutorWindow;
[...]
public void Run(object sender)
{
myExecutorWindow = sender as BackgroundWorker;
string[] options = new string[2];
int i = 0;
while (LeftToRun > 0)
{
if (CurrentRunningThreads < MaxThreadsRunning)
{
BackgroundWorker myThread = new BackgroundWorker();
myThread.DoWork += new DoWorkEventHandler(backgroundWorkerRemoteProcess_DoWork);
myThread.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorkerRemoteProcess_RunWorkerCompleted);
myThread.ProgressChanged += new ProgressChangedEventHandler(backgroundWorkerRemoteProcess_ProgressChanged);
myThread.WorkerReportsProgress = true;
myThread.WorkerSupportsCancellation = true;
myThread.RunWorkerAsync(new string[2] {opt1, opt2});
CurrentRunningThreads++;
i++;
LeftToRun--;
}
}
[...]
private void backgroundWorkerRemoteProcess_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker myBackgroundWorker = sender as BackgroundWorker;
myBackgroundWorker.ReportProgress(1);
// PROCESSING MY STUFF HERE
myBackgroundWorker.ReportProgress(1);
}
private void backgroundWorkerRemoteProcess_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
myExecutorWindow.ReportProgress(1);
}
I found a really simple solution to create a thread to run any block of code as well as handle Invocation back to the main thread to change the control's properties. It works out of the box with .NET 4.5 and the lambda call on the Dispatcher could be adapted to work with earlier versions of .NET. The main benefit is it's just so blissfully simple and perfect when you just need a quick thread for some really basic bit of code.
So presuming you have a progress bar somewhere on your dialog in scope do this:
progBar.Minimum = 0;
progBar.Maximum = theMaxValue;
progBar.Value = 0;
Dispatcher disp = Dispatcher.CurrentDispatcher;
new Thread(() => {
// Code executing in other thread
while (progBar.Value < theMaxValue)
{
// Your application logic here
// Invoke Main Thread UI updates
disp.Invoke(
() =>
{
progBar.Value++;
}
);
}
}).Start();
You also need to ensure you have a reference to WindowsBase.dll
If you want a more reusable snippet of code running as the thread start you could use a method as the delegate but I find the inline lambda so easy for simple tasks and you don't need to deal with events as with the Background Worker approaches.
Related
first off I'd like to say I'm brand new to C# so I am not too aware with how the background worker is supposed to be implemented. I have a GUI program that basically pings a domain a returns the response to a textbox. I am able to get it to work normally, however, it freezes the code because it is running on the same thread which is why I am trying to implement a background worker.
Here is the basic setup
private void button1_Click(object sender, EventArgs e)
{
url = textBox1.Text;
button1.Enabled = false;
button2.Enabled = true;
bgWorker.DoWork += new DoWorkEventHandler(bgWorker_DoWork);
bgWorker.RunWorkerAsync();
}
private void bgWorker_DoWork(object sender, DoWorkEventArgs e)
{
do
{
if (bgWorker.CancellationPending)
break;
Invoke((MethodInvoker)delegate { monitor(); });
} while (true);
}
public void monitor()
{
textBox2.AppendText("Status of: " + url + "\n");
Status(url);
System.Threading.Thread.Sleep(30000);
}
private void Status(string url)
{
// This method does all the ping work and also appends the status to the Text box as it goes through , as OK or down
}
I have not worked with bgworkers before and as you can imagine it's confusing. I've looked at tons of other articles and I can't seem to get it. Sorry if the code looks crazy, I'm trying to learn.
Use Microsoft's Reactive Framework (NuGet "System.Reactive.Windows.Forms" and add using System.Reactive.Linq;) and then you can do this:
private void button1_Click(object sender, EventArgs e)
{
var url = textBox1.Text;
Observable
.Interval(TimeSpan.FromMinutes(0.5))
.SelectMany(_ => Observable.Start(() => Status(url)))
.ObserveOn(this)
.Subscribe(status => textBox2.AppendText("Status of: " + status + "\n"));
}
You then just need to change Status to have this signature: string Status(string url).
That's it. No background worker. No invoking. And Status is nicely run on a background thread.
You've got several mistakes. First,
Invoke((MethodInvoker)delegate
{
monitor();
});
will call monitor() on your UI thread. In almost all cases you should not call methods on other threads. You especially should not call methods that block or do anything that takes more than a few milliseconds on your UI thread, and that is what this does:
System.Threading.Thread.Sleep(30000);
Instead of calling a method on another thread; submit immutable data to the other thread and let the thread decide when to handle it. There is an event already built in to BackgroundWorker which does that. Before you call bgWorker.RunWorkerAsync() do this:
url = new Uri(something);
bgWorker.WorkerReportsProgress = true;
bgWorker.WorkerSupportsCancellation = true;
bgWorker.ProgressChanged += Bgw_ProgressChanged;
private void Bgw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
textBox2.AppendText("Status of: " + url + ": " + e.UserState.ToString()
+ Environment.NewLine);
}
Your bgWorker_DoWork should look more like this:
void bgWorker_DoWork(object sender, DoWorkEventArgs e)
{
while (!bgw.CancellationPending)
{
System.Threading.Thread.Sleep(new TimeSpan(0, 0, 30));
var status = ResultOfPing(e.Argument as Uri);
bgw.ReportProgress(0, status);
}
e.Cancel = true;
}
and you should call it like this:
bgWorker.RunWorkerAsync(url);
You've got a second problem. BackgroundWorker creates a thread, and your thread is going to spend most of its time blocked on a timer or waiting for network responses. That is a poor use of a thread. You would be better off using completion callbacks or async/await.
The background worker is running on a thread pool thread, but your call to Status and Sleep is running on the UI thread. You need to move that stuff back into bgWorker_DoWork.
Try this code:
public partial class Form1 : Form
{
bool cancel;
public Form1()
{
InitializeComponent();
}
public void StartPinging()
{
this.cancel = false;
startButton.Enabled = false;
stopButton.Enabled = true;
responseBox.Clear();
responseBox.AppendText("Starting to ping server.");
responseBox.AppendText(Environment.NewLine);
var bw = new BackgroundWorker
{
WorkerReportsProgress = false,
WorkerSupportsCancellation = true
};
bw.DoWork += (obj, ev) =>
{
while (!cancel)
{
// Ping Server Here
string response = Server.PingServer();
this.Invoke(new UiMethod(() =>
{
responseBox.AppendText(response);
responseBox.AppendText(Environment.NewLine);
}));
}
};
bw.RunWorkerCompleted += (obj, ev) =>
{
this.Invoke(new UiMethod(() =>
{
responseBox.AppendText("Stopped pinging the server.");
responseBox.AppendText(Environment.NewLine);
startButton.Enabled = true;
stopButton.Enabled = false;
}));
};
bw.RunWorkerAsync();
}
delegate void UiMethod();
private void startButton_Click(object sender, EventArgs e)
{
StartPinging();
}
private void stopButton_Click(object sender, EventArgs e)
{
responseBox.AppendText("Cancelation Pressed.");
responseBox.AppendText(Environment.NewLine);
cancel = true;
}
}
public class Server
{
static Random rng = new Random();
public static string PingServer()
{
int time = 1200 + rng.Next(2400);
Thread.Sleep(time);
return $"{time} ms";
}
}
Erwin, when dealing with C# - threads and UI elements usually you will come across cross-thread operations i.e. Background thread with UI threads. This interaction needs to be done in thread safe way with the help of Invoke to avoid invalid operations.
Please look into below resource: InvokeRequired section.
https://learn.microsoft.com/en-us/dotnet/framework/winforms/controls/how-to-make-thread-safe-calls-to-windows-forms-controls
I have looked everywhere for the answer and I thought it would be simple to find but apparently not. I've heard about invoke but I have no idea how to use it or what it is.
Here is my code:
public void Thread1(object sender, EventArgs e)
{
this.button1.Enabled = false;
this.textBox2.Clear();
this.textBox3.Clear();
this.textBox4.Clear();
this.textBox6.Text = "£" + "0";
//Generate 3 random numbers
Stopwatch timer = new Stopwatch();
timer.Start();
this.Refresh();
//This is only part of this function
}
private void button1_Click(object sender, EventArgs e)
{
ThreadStart threadStart = new ThreadStart(() => Thread1(sender, e));
Thread newThread = new Thread(threadStart);
newThread.Start();
}
In background threads, use Invoke() on WinForms components to execute code on the UI thread:
this.Invoke( () => {
this.button1.Enabled = true;
this.textBox2.Text = "whatever";
} );
Documentation: https://msdn.microsoft.com/en-us/library/a1hetckb.aspx
So I can't say for sure this is the issue but I'm just about positive it is. I have a recordset of IVR calls to make. I put the data for each one in a concurrent queue and start 5 background workers to start working from the queue. However, after making 2 calls, the calls stop coming until one person hangs up, then it moves on to call number 3,4,5 etc. Are the any issues with this code?
It seems like the background workers are blocking eachother from calling the same method...? Is that possible?
private ConcurrentQueue<DataTable> _ivrCallsQueue = new ConcurrentQueue<DataTable>();
private List<BackgroundWorker> _ivrCallers = new List<BackgroundWorker>();
public overrid void Process()
{
foreach(DataRow row in _tblRecordsToProcess.Rows)
{
_workingActionItem = actionItemDAL.GetActionItemFromId(Convert.ToInt32(row["FNActionItemId"].ToString()));
var workingActionItemsTable = actionItemDAL.GetActionItemParamValues(Convert.ToInt32(row["FNActionItemId"].ToString()));
ivrCallsQueue.Enqueue(workingActionItemsTable);
}
StartCalls();
while (_ivrCallers.Count != 0)
{
testurls = testurls;
}
}
private void StartCalls()
{
int maxLines = 5;
if (_ivrCallsQueue.Count < maxLines)
{
maxLines = _ivrCallsQueue.Count;
}
for (int i = 0; i < maxLines; i++)
{
DataTable workingCall = new DataTable();
_ivrCallsQueue.TryDequeue(out workingCall);
BackgroundWorker ivrCaller = new BackgroundWorker();
_ivrCallers.Add(ivrCaller);
ivrCaller.DoWork += delegate(object sender, DoWorkEventArgs e)
{
RequestIVR(workingCall, Convert.ToInt32(workingCall.Rows[2][0].ToString()));
_ivrCallers.Remove(ivrCaller);
};
ivrCaller.RunWorkerCompleted += (bw_AnalyzeResults);
ivrCaller.RunWorkerAsync();
}
}
private void bw_AnalyzeResults(object sender, RunWorkerCompletedEventArgs e)
{
DataTable workingCall = new DataTable();
if (_ivrCallsQueue.Count != 0)
{
_ivrCallsQueue.TryDequeue(out workingCall);
BackgroundWorker ivrCaller = new BackgroundWorker();
ivrCaller.DoWork += delegate(object completeSender, DoWorkEventArgs completeArgs)
{
RequestIVR(workingCall, Convert.ToInt32(workingCall.Rows[2][0].ToString()));
_ivrCallers.Remove(ivrCaller);
};
ivrCaller.RunWorkerCompleted += (bw_AnalyzeResults);
ivrCaller.RunWorkerAsync();
}
else
{
}
}
private void RequestIVR(DataTable workingTable,int fnActionItemID)
{
var urlRequest = "http://uccx_http_trigger:9080/test?strTestMode=1&strTaskID=" + fnActionItemID;
var webClient = new WebClient { UseDefaultCredentials = true, Proxy = WebRequest.DefaultWebProxy };
DecodeResponseType(GetValueFromElement("Response Code was ", webClient.DownloadString(urlRequest)));
}
This will spawn at most five threads that each attempt to pull the next item from the queue and process it. If the queue is empty the attempt will fail and the thread will simply exit:
private List<System.Threading.Thread> Threads = new List<System.Threading.Thread>();
private ConcurrentQueue<DataTable> _ivrCallsQueue = new ConcurrentQueue<DataTable>();
private void StartCalls()
{
int maxLines = Math.Min(5 , _ivrCallsQueue.Count);
for (int i = 0; i < maxLines; i++ )
{
System.Threading.Thread T = new System.Threading.Thread(delegate()
{
DataTable workingCall;
while (_ivrCallsQueue.TryDequeue(out workingCall))
{
RequestIVR(workingCall, Convert.ToInt32(workingCall.Rows[2][0].ToString()));
}
});
Threads.Add(T);
T.Start();
}
}
The threads will keep running until all the items have been processed.
It looks like bw_AnalyzeResults does pretty much the same thing that StartCalls() does. In other words, when the background worker has finished its work, you immediately enqueue the same work to happen again, recursively forever?
By the looks of it, you want bw_AnalyzeResults to analyze the results returned by calling your web service. That is not what is happening at the moment.
The code below taken from the bw_AnalyzeResults event handler is scheduling a background job and making itself handle the RunWorkerCompleted event. So, presumably the software keeps going around and around executing bw_AnalyzeResults forever until you kill the process?
private void bw_AnalyzeResults(object sender, RunWorkerCompletedEventArgs e)
{
ivrCaller.DoWork += delegate(object completeSender, DoWorkEventArgs completeArgs)
{
RequestIVR(workingCall, Convert.ToInt32(workingCall.Rows[2][0].ToString()));
_ivrCallers.Remove(ivrCaller);
};
ivrCaller.RunWorkerCompleted += (bw_AnalyzeResults);
}
I want to set a progress bar for my application.
I am using a background to download somefiles from my server.
It would be nice if I set a progress bar for that.
I know to use
ProgressBar.Value = 5;
and more.
but I want to use progress bar.'
I am using this code for progress bar
private void bgDownload_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.downloadProgressBar.Value = e.ProgressPercentage;
}
but its not working.
Can any one say how can I do it.
Thanks In Advance
If you're doing processing in the background, the UI will not update until its over.
So what you'll need to do is create a seperate thread which the processing will happen in, and within that thread update the progress bar. In the main thread don't do anything.
To update the progress bar from within another thread, you will need a delegate (or you'll get a runtime error).
Hope this can get you started.
You can try to use BackgroundWorker to download some files.
So backgroud download won't effect your Process Bar.
private void btnDownLoad_Click(System.Object sender,
System.EventArgs e)
{
// Start the asynchronous operation.
backgroundWorkerDownLoadFile.RunWorkerAsync();
}
private void backgroundWorkerDownLoadFile_DoWork(object sender,
DoWorkEventArgs e)
{
// Get the File in Server.
}
I assume you are using background worker component. So, you will have to call ReportProgress method of backgroundworker from its DoWork method which should update the progress bar. Please find below some reference on ReportProgress method from MSDN:
http://msdn.microsoft.com/en-us/library/ka89zff4.aspx
in addition to what JKhuang wrote, to alter the values in your progress bar you'll need to add
a delegate and a callback function
delegate void SetProgCallback(int newVal);
private void SetProgressbarValue(int newVal)
{
if (progbar.InvokeRequired)
{
SetProgCallback d = SetProgressbarValue;
Invoke(d, new object[] { newVal });
}
else
{
//insert your actual code here
}
}
Here is an example of how to do this.
public int ProgressBarPercentage { get; set; }
public string StatusMessage { get; set; }
public void StartDownload()
{
BackgroundWorker bw = new BackgroundWorker();
bw.WorkerReportsProgress = true;
bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
bw.DoWork += new DoWorkEventHandler(bw_DoWork);
bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
bw.RunWorkerAsync();
}
void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
// Run clean up code here once complete (ie make sure progress bar is at 100 percent....
}
void bw_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker bw = sender as BackgroundWorker;
// Download files here
List<string> filestoget = new List<string>();
filestoget.Add("File1");
filestoget.Add("File2");
filestoget.Add("File3");
filestoget.Add("File4");
filestoget.Add("File5");
foreach (string file in filestoget)
{
// Get File
// Report output
int progress = 0; // add soemthing here to calculate your progress
bw.ReportProgress(progress, string.Format("File {0} downloaded", file));
}
}
void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
ProgressBarPercentage = e.ProgressPercentage;
StatusMessage = e.UserState.ToString();
}
I have written code to save an image which is generated by the application. The size of the image is around 32-35 MB. While saving the image to a BMB file, it is taking a long time, around 3-5 secs. For this purpose, I have used a background worker but when running the background worker, it shows an error like..."can't access the object as it is created on different thread".
Following is the code:
private void btnSaveDesign_Click(object sender, RoutedEventArgs e)
{
Microsoft.Win32.SaveFileDialog sfd = new Microsoft.Win32.SaveFileDialog();
sfd.Title = "Save design as...";
sfd.Filter = "BMP|*.bmp";
if (sfd.ShowDialog() == true)
{
ww = new winWait();
ww.Show();
System.ComponentModel.BackgroundWorker bw = new System.ComponentModel.BackgroundWorker();
bw.DoWork += new System.ComponentModel.DoWorkEventHandler(bw_DoWork);
bw.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
fName = sfd.FileName;
cache = new CachedBitmap((BitmapSource)imgOut.Source, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
bw.RunWorkerAsync();
}
}
void bw_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e)
{
ww.Close();
}
void bw_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
BmpBitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(cache)); //here... it says cant access...
using (FileStream file = File.OpenWrite(fName))
{
encoder.Save(file);
}
}
I have declared "cache" as a global object. (A similar trick worked when I was programming in Windows Forms with VB.NET.)
ww is the wait window that I want to be displayed while the precess is being executed.
How to do this? Is there any other simple method for multi threading in WPF?
When WPF objects are created they are assigned to a Dispatcher object. This disallows any threads other than the creating thread to access the object. This can be circumvented by freezing the object by calling the freeze method. You would need to call Freeze on your bitmapsource object. Once you have frozen your object it becomes uneditable
Your problem comes about because you are accessing an object which is not created by the background worker thread. Normally this would happen if you access a UI control which is created in the main thread and accessed from different thread.
Use the code below.
Dispatcher.Invoke
(
new Action(
delegate()
{
BmpBitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(cache));
using (FileStream file = File.OpenWrite(fName))
{
encoder.Save(file);
}
}
)
);
I think you have to pass cache as a parameter to the new thread:
bw.RunWorkerAsync(cache);
and get it from the DoWork method:
var cache=(CacheType) e.Argument;
.NET framework provides a simple way to get started in threading with
the BackgroundWorker component. This wraps much of the complexity and
makes spawning a background thread relatively safe. In addition, it
allows you to communicate between your background thread and your UI
thread without doing any special coding. You can use this component
with WinForms and WPF applications. The BackgroundWorker offers
several features which include spawning a background thread, the
ability to cancel the background process before it has completed, and
the chance to report the progress back to your UI.
public BackgroudWorker()
{
InitializeComponent();
backgroundWorker = ((BackgroundWorker)this.FindResource("backgroundWorker"));
}
private int DoSlowProcess(int iterations, BackgroundWorker worker, DoWorkEventArgs e)
{
int result = 0;
for (int i = 0; i <= iterations; i++)
{
if (worker != null)
{
if (worker.CancellationPending)
{
e.Cancel = true;
return result;
}
if (worker.WorkerReportsProgress)
{
int percentComplete =
(int)((float)i / (float)iterations * 100);
worker.ReportProgress(percentComplete);
}
}
Thread.Sleep(100);
result = i;
}
return result;
}
private void startButton_Click(object sender, RoutedEventArgs e)
{
int iterations = 0;
if (int.TryParse(inputBox.Text, out iterations))
{
backgroundWorker.RunWorkerAsync(iterations);
startButton.IsEnabled = false;
cancelButton.IsEnabled = true;
outputBox.Text = "";
}
}
private void cancelButton_Click(object sender, RoutedEventArgs e)
{
// TODO: Implement Cancel process
this.backgroundWorker.CancelAsync();
}
private void BackgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
// e.Result = DoSlowProcess((int)e.Argument);
var bgw = sender as BackgroundWorker;
e.Result = DoSlowProcess((int)e.Argument, bgw, e);
}
private void BackgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
workerProgress.Value = e.ProgressPercentage;
}
private void BackgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Error != null)
{
MessageBox.Show(e.Error.Message);
}
else if (e.Cancelled)
{
outputBox.Text = "Canceled";
workerProgress.Value = 0;
}
else
{
outputBox.Text = e.Result.ToString();
workerProgress.Value = 0;
}
startButton.IsEnabled = true;
cancelButton.IsEnabled = false;
}