asyncworkerprogress.html

---
layout: documentation 
title: EvaluationEngine 
teaser: Decouple business logic from control flow
navigation:
   - name: Overview
     link: asyncworker.html 
   - name: Execute asynchronous operation
     link: asyncworkerasyncoperation.html
   - name: Execute code on completion
     link: asyncworkercompletion.html
   - name: Exception Handling
     link: asyncworkerexceptionhandling.html
   - name: Cancel asynchronous operation
     link: asyncworkercancel.html
   - name: Use progress
     link: asyncworkerprogress.html
   - name: Testability
     link: asyncworkertestability.html
---

<h2>Show Progress</h2>

<script type="syntaxhighlighter" class="brush: csharp"><![CDATA[
DoWorkEventHandler worker = delegate(object sender, DoWorkEventArgs e)
{
     AsyncWorker genericWorker = (AsyncWorker)sender;
     genericWorker.WorkerReportsProgress = true;

     for (int i = 0; i <= 100; i += 10)
     {
         genericWorker.ReportProgress(i, "current step = " + i);
     }
};

ProgressChangedEventHandler progress = (sender, e) =>
{
    // update UI with this data:
    int percentage = e.ProgressPercentage;
    object step = e.UserState;
};

AsyncWorker asyncWorker = new AsyncWorker(worker, progress, null);

asyncWorker.RunWorkerAsync();
]]></script>

<p>
The progress callback will be called on the thread on which the async worker was started if this thread supports synchronization (UI thread do support synchronization).
</p>