improved no deadlock example

Author: crowcoder

AsyncTesting.sln

@@ -1,10 +1,15 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
-VisualStudioVersion = 15.0.26730.10
+VisualStudioVersion = 15.0.26730.16
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WPFGui", "AsyncTesting\WPFGui.csproj", "{201924C3-E71B-4F00-9F77-9024E7D90DF9}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{AB0737E7-61A4-49A7-A2C5-F89080031747}"
+	ProjectSection(SolutionItems) = preProject
+		.gitignore = .gitignore
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU

AsyncTesting/Commands/SaveAndDeadLockEvenWithConfigureAwaitFalse.cs

@@ -24,10 +24,7 @@ public void Execute(object parameter)
             TheViewModel vm = parameter as TheViewModel;
             vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
 
-            //Blocks while CallSomethingAsync runs. CallSomethingAsync
-            //has switched contexts even though ConfigureAwait(false)
-            //is used! This is because the library code does not also
-            //use ConfigureAwait(false);
+            //Blocks while CallSomethingAsync runs. 
             string msg =  CallSomethingAsync(vm).Result;
             vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
             vm.UpdateDescription(msg);

AsyncTesting/Commands/SaveWithNoDeadlock.cs

@@ -1,8 +1,10 @@
 using AsyncTesting.Models;
 using System;
+using System.Diagnostics;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Windows.Input;
+using System.Windows.Threading;
 
 namespace AsyncTesting.Commands
 {
@@ -26,14 +28,14 @@ public void Execute(object parameter)
 
             //Blocks while CallSomethingAsync runs. CallSomethingAsync
             //cannot resume on the context because .Result is blocking.
-            string msg =  CallSomethingAsync(vm).Result;
-            vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
-            vm.UpdateDescription(msg);
+            var msg = CallSomethingAsync(vm); 
+            vm.UpdateDescription(msg.Result);
         }
 
         private async Task<string> CallSomethingAsync(TheViewModel vm)
         {
-            await Task.Delay(10).ConfigureAwait(continueOnCapturedContext:false);
+            //quick delay just to (attempt) to switch threads
+            await Task.Delay(10).ConfigureAwait(continueOnCapturedContext:false);           
             vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
             await Task.Delay(1000).ConfigureAwait(continueOnCapturedContext: false);
             return $"No deadlock because blocking call is on different context.";