Added a "BeginInvokeOnMainThreadAsync" method to "IDeviceService"

PrismLibrary · Apr 25, 2020 · 94155bb · 94155bb
1 parent 8597347
commit 94155bb
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Showing 2 changed files with 32 additions and 0 deletions.
diff --git a/src/Forms/Prism.Forms/Services/DeviceService.cs b/src/Forms/Prism.Forms/Services/DeviceService.cs
@@ -1,5 +1,6 @@
 using Prism.AppModel;
 using System;
+using System.Threading.Tasks;
 using Xamarin.Forms;
 
 namespace Prism.Services
@@ -66,6 +67,30 @@ public void BeginInvokeOnMainThread(Action action)
             Device.BeginInvokeOnMainThread(action);
         }
 
+        /// <summary>
+        /// Invokes an action (which can be awaited) on the device main UI thread.
+        /// </summary>
+        /// <param name="action">The Action to invoke</param>
+        public Task BeginInvokeOnMainThreadAsync(Action action)
+        {
+            var tcs = new TaskCompletionSource<bool>();
+
+            Device.BeginInvokeOnMainThread(() =>
+            {
+                try
+                {
+                    action();
+                    tcs.TrySetResult(true);
+                }
+                catch (Exception ex)
+                {
+                    tcs.TrySetException(ex);
+                }
+            });
+
+            return tcs.Task;
+        }
+
         /// <summary>
         /// Starts a recurring timer using the Device clock capabilities.
         /// </summary>

diff --git a/src/Forms/Prism.Forms/Services/IDeviceService.cs b/src/Forms/Prism.Forms/Services/IDeviceService.cs
@@ -1,5 +1,6 @@
 using Prism.AppModel;
 using System;
+using System.Threading.Tasks;
 using Xamarin.Forms;
 
 namespace Prism.Services
@@ -29,6 +30,12 @@ public interface IDeviceService
         /// </summary>
         /// <param name="action">The Action to invoke</param>
         void BeginInvokeOnMainThread(Action action);
+
+        /// <summary>
+        /// Invokes an action (which can be awaited) on the device main UI thread.
+        /// </summary>
+        /// <param name="action">The Action to invoke</param>
+        Task BeginInvokeOnMainThreadAsync(Action action);
 
         /// <summary>
         /// Starts a recurring timer using the Device clock capabilities.