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POInvalid cross-thread access. error
 

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  1. POInvalid cross-thread access. error
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    <p>I have a web form in silverlight.</p> <p>On action of some button click i want to update a another control like chart, Textbox etc</p> <p>In the mean time when it fills the chart or textbox, i need to show a busy indicator</p> <ol> <li>Busy indicator should show first in screen</li> <li>behind the chart value should get update</li> <li>Chart value will reflect in screen</li> <li>Busy indicator should hide</li> </ol> <p>But the problem is when i try using Thread I am getting an error "Invalid cross-thread access.". As the thread is accessing the UI control. The 4 steps which i have tried is as follows.</p> <p>Any valuable suggestion how to solve this issue.</p> <h2>Step 1 => Tried Thread</h2> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.Threading; using System.ComponentModel; using System.Windows.Threading; namespace SilverlightApplication2 { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); } private void test1() { for (int i = 1; i &lt; 10000; i++) { System.Diagnostics.Debug.WriteLine(i.ToString()); } textbox1.Text="test"; //=&gt; Throwing Error "Invalid cross-thread access." busyIndicator1.IsBusy = false; //=&gt; Throwing Error "Invalid cross-thread access." } private void button1_Click(object sender, RoutedEventArgs e) { busyIndicator1.IsBusy = true; Thread th1 = new Thread(test1); th1.Start(); } } } </code></pre> <h2>step 2 => Tried BackgroundWorker</h2> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.Threading; using System.ComponentModel; using System.Windows.Threading; namespace SilverlightApplication2 { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); } private void test1() { for (int i = 1; i &lt; 10000; i++) { System.Diagnostics.Debug.WriteLine(i.ToString()); } textbox1.Text="test"; //=&gt; Throwing Error "Invalid cross-thread access." busyIndicator1.IsBusy = false; //=&gt; Throwing Error "Invalid cross-thread access." } private void button1_Click(object sender, RoutedEventArgs e) { busyIndicator1.IsBusy = true; var bw = new BackgroundWorker(); bw.DoWork += (s, args) =&gt; { test1(); //Stuff that takes some time }; bw.RunWorkerCompleted += (s, args) =&gt; { busyIndicator1.IsBusy = false; }; bw.RunWorkerAsync(); } } } </code></pre> <h2>Step 3 => Tried to raise an Event from the code behind</h2> <pre><code>public delegate void LinkToEventHandler(); public static event LinkToEventHandler Evt; private void button1_Click(object sender, RoutedEventArgs e) { busyIndicator1.IsBusy = true; Evt += new LinkToEventHandler(this.test1); Evt(); } private void test1() { for (int i = 1; i &lt; 10000; i++) { System.Diagnostics.Debug.WriteLine(i.ToString()); } textbox1.Text="test"; //=&gt; Throwing Error "Invalid cross-thread access." busyIndicator1.IsBusy = false; //=&gt; Throwing Error "Invalid cross-thread access." } </code></pre> <h2>step 4 => Tried Binding the Busyindicator</h2> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.Threading; using System.ComponentModel; using System.Windows.Threading; namespace SilverlightApplication2 { public partial class MainPage : INotifyPropertyChanged { public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged; public const string IsBusyPropertyName = "busyIndicator1"; private bool _isBusy = false; public bool IsBusy { get { return _isBusy; } set { if (_isBusy != value) { _isBusy = value; RaisePropertyChanged(IsBusyPropertyName); } } } protected void RaisePropertyChanged(string propertyName) { System.ComponentModel.PropertyChangedEventHandler propertyChanged = this.PropertyChanged; if ((propertyChanged != null)) { propertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName)); } } private void button1_Click(object sender, RoutedEventArgs e) { IsBusy = true; test1(); IsBusy=false; } } public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); } private void test1() { for (int i = 1; i &lt; 10000; i++) { System.Diagnostics.Debug.WriteLine(i.ToString()); } } } } </code></pre> <p>Note:- I want a solution which should work in Web form in silverlight not the windows form</p>
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    1. USJulien Roncaglia
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