WPF Dispatcher Extentions

using System;
using System.Threading;
using System.Windows.Threading;

namespace Client.AppUtils
{
    /// <summary>
    /// Extentions class for Dispatcher
    /// </summary>
    public static class DispatcherExtentions
    {
        /// <summary>
        /// Returns true if the caller is on a separate thread than the UI thread
        /// </summary>
        public static bool IsInvokeRequired(this Dispatcher dispatcher)
        {
            return dispatcher.Thread.ManagedThreadId != Thread.CurrentThread.ManagedThreadId;
        }

        /// <summary>
        /// Calls the Dispatcher.Invoke() method if the caller is on a separate thread than the UI thread, otherwise the provided method is called
        /// </summary>
        public static void InvokeIfNeeded(this Dispatcher dispatcher, Action method, params object[] args)
        {
            if (IsInvokeRequired(dispatcher))
                dispatcher.Invoke(method, args);
            else
                method();
        }

        /// <summary>
        /// Calls the Dispatcher.Invoke() method if the caller is on a separate thread than the UI thread, otherwise the provided method is called
        /// </summary>
        public static T InvokeIfNeeded<T>(this Dispatcher dispatcher, Func<T> method)
        {
            if (IsInvokeRequired(dispatcher))
                return dispatcher.Invoke<T>(method);
            else
                return method();
        }

        /// <summary>
        /// Calls the Dispatcher.BeginInvoke() method if the caller is on a separate thread than the UI thread, otherwise the provided method is called
        /// </summary>
        public static void BeginInvokeIfNeeded(this Dispatcher dispatcher, Action action)
        {
            if (IsInvokeRequired(dispatcher))
                dispatcher.BeginInvoke(action);
            else
                action();
        }
    }
}