Saxonite 1.2.11.3. Sandtrap.

SacsMobileXamarin/Xamarin/Tasks/SaxThreadUtil.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+
+namespace Sarand.Net.Mobile.Xamarin.Tasks
+{
+	//=======================================================================
+	public static class SaxThreadUtil
+	{
+		//-------------------------------------------------------------------
+		//    I n v o k e   o n   M a i n   T h r e a d   a n d   W a i t
+		//-------------------------------------------------------------------
+		// Invoke task on main thread and wait for completion.
+		public static void BeginInvokeOnMainThreadSync (Action taskFn)
+		{
+			var tcs = new TaskCompletionSource<Object>();
+			Device.BeginInvokeOnMainThread(() =>
+			{
+				try
+				{
+					taskFn();
+					tcs.SetResult(null);
+				}
+				catch (Exception ex) { tcs.SetException(ex); }
+			});
+		}
+		public static T BeginInvokeOnMainThreadSync<T> (Func<T> taskFn)
+		{
+			var tcs = new TaskCompletionSource<T>();
+			Device.BeginInvokeOnMainThread(() =>
+			{
+				try
+				{
+					var result = taskFn();
+					tcs.SetResult(result);
+				}
+				catch (Exception ex) { tcs.SetException(ex); }
+			});
+			return tcs.Task.Result;
+		}
+
+		//-------------------------------------------------------------------
+	}
+	//=======================================================================
+}