Esempio di threading della luce MVVM
-
25-09-2019 - |
Domanda
Ci sono esempi su come utilizzare la porzione di threading della luce MVVM? Qual è il vantaggio dell'utilizzo di mvvmlight.Threading sul normale threading .NET?
Soluzione
Sembra che tutta la parte di threading in mvvmlight sia questa classe:
public static class DispatcherHelper
{
public static Dispatcher UIDispatcher
{
get;
private set;
}
/// <summary>
/// Executes an action on the UI thread. If this method is called
/// from the UI thread, the action is executed immendiately. If the
/// method is called from another thread, the action will be enqueued
/// on the UI thread's dispatcher and executed asynchronously.
/// <para>For additional operations on the UI thread, you can get a
/// reference to the UI thread's dispatcher thanks to the property
/// <see cref="UIDispatcher" /></para>.
/// </summary>
/// <param name="action">The action that will be executed on the UI
/// thread.</param>
public static void CheckBeginInvokeOnUI(Action action)
{
if (UIDispatcher.CheckAccess())
{
action();
}
else
{
UIDispatcher.BeginInvoke(action);
}
}
/// <summary>
/// This method should be called once on the UI thread to ensure that
/// the <see cref="UIDispatcher" /> property is initialized.
/// <para>In a Silverlight application, call this method in the
/// Application_Startup event handler, after the MainPage is constructed.</para>
/// <para>In WPF, call this method on the static App() constructor.</para>
/// </summary>
public static void Initialize()
{
if (UIDispatcher != null)
{
return;
}
// for silverlight
UIDispatcher = Deployment.Current.Dispatcher;
// wpf
//IDispatcher = Dispatcher.CurrentDispatcher;
}
}
}
e questo è tutto. Usa Dispatcherhelper.initialize () secondo il commento in costruttore di app statico (WPF) o Application_Startup Event Handler (Silverlight) - e quindi puoi usare Dispatcherhelper.checkbeginInvokeonui (azione azione)
Saluti
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