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‎.vs/AsyncTesting/v15/.suo

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‎.vs/AsyncTesting/v15/sqlite3/storage.ide

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‎AsyncTesting.sln

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 15
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VisualStudioVersion = 15.0.26730.10
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WPFGui", "AsyncTesting\WPFGui.csproj", "{201924C3-E71B-4F00-9F77-9024E7D90DF9}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{201924C3-E71B-4F00-9F77-9024E7D90DF9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{201924C3-E71B-4F00-9F77-9024E7D90DF9}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{201924C3-E71B-4F00-9F77-9024E7D90DF9}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{201924C3-E71B-4F00-9F77-9024E7D90DF9}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {DA20A861-E8E5-4D41-B6BB-1E15515C6F31}
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EndGlobalSection
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EndGlobal

‎AsyncTesting/App.config

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<?xml version="1.0" encoding="utf-8"?>
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<configuration>
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<startup>
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<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1"/>
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</startup>
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</configuration>

‎AsyncTesting/App.xaml

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<Application x:Class="AsyncTesting.App"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="clr-namespace:AsyncTesting"
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StartupUri="MainWindow.xaml">
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<Application.Resources>
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<Style TargetType="Label">
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<Setter Property="Padding" Value="3" />
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<Setter Property="Margin" Value="3" />
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<Setter Property="FontSize" Value="14" />
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<Setter Property="FontWeight" Value="Bold"/>
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</Style>
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<Style TargetType="TextBox">
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<Setter Property="Padding" Value="3" />
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<Setter Property="Margin" Value="3" />
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<Setter Property="FontSize" Value="14" />
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<Setter Property="HorizontalAlignment" Value="Stretch" />
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</Style>
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<Style TargetType="Button" >
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<Setter Property="HorizontalAlignment" Value="Left" />
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<Setter Property="Width" Value="250" />
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<Setter Property="Margin" Value="5" />
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</Style>
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</Application.Resources>
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</Application>

‎AsyncTesting/App.xaml.cs

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using System;
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using System.Collections.Generic;
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using System.Configuration;
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using System.Data;
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using System.Linq;
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using System.Threading.Tasks;
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using System.Windows;
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namespace AsyncTesting
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{
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/// <summary>
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/// Interaction logic for App.xaml
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/// </summary>
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public partial class App : Application
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{
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}
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}

‎AsyncTesting/Commands/SaveAndDeadLock.cs

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using AsyncTesting.Models;
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using System;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Windows.Input;
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namespace AsyncTesting.Commands
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{
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public class SaveAndDeadLock : ICommand
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{
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public event EventHandler CanExecuteChanged;
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public bool CanExecute(object parameter)
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{
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return true;
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}
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/// <summary>
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/// Deadlocks
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/// </summary>
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/// <param name="parameter"></param>
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public void Execute(object parameter)
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{
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TheViewModel vm = parameter as TheViewModel;
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vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
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//Blocks while CallSomethingAsync runs. CallSomethingAsync
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//cannot resume on the context because .Result is blocking.
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string msg = CallSomethingAsync(vm).Result;
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vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
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vm.UpdateDescription(msg);
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}
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private async Task<string> CallSomethingAsync(TheViewModel vm)
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{
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await Task.Delay(10);
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vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
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await Task.Delay(1000);
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return $"You will never see this message.";
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}
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}
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}

‎AsyncTesting/Commands/SaveAndDeadLockEvenWithConfigureAwaitFalse.cs

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using AsyncTesting.Models;
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using System;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Windows.Input;
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namespace AsyncTesting.Commands
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{
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public class SaveAndDeadLockEvenWithConfigureAwaitFalse : ICommand
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{
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public event EventHandler CanExecuteChanged;
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public bool CanExecute(object parameter)
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{
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return true;
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}
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/// <summary>
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/// Deadlocks
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/// </summary>
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/// <param name="parameter"></param>
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public void Execute(object parameter)
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{
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TheViewModel vm = parameter as TheViewModel;
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vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
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//Blocks while CallSomethingAsync runs. CallSomethingAsync
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//has switched contexts even though ConfigureAwait(false)
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//is used! This is because the library code does not also
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//use ConfigureAwait(false);
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string msg = CallSomethingAsync(vm).Result;
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vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
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vm.UpdateDescription(msg);
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}
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private async Task<string> CallSomethingAsync(TheViewModel vm)
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{
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LibraryCode lc = new LibraryCode();
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string msg = await lc.BadEttiquette().ConfigureAwait(continueOnCapturedContext:false);
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return msg;
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}
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}
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}

‎AsyncTesting/Commands/SaveContextAware.cs

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using AsyncTesting.Models;
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using System;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Windows.Input;
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namespace AsyncTesting.Commands
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{
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public class SaveContextAware : ICommand
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{
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public event EventHandler CanExecuteChanged;
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public bool CanExecute(object parameter)
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{
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return true;
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}
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/// <summary>
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/// Works because we never switch contexts
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/// </summary>
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/// <param name="parameter"></param>
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public async void Execute(object parameter)
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{
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TheViewModel vm = parameter as TheViewModel;
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vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
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//Remains context aware
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string msg = await CallSomethingAsync(vm);
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vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
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vm.UpdateDescription(msg);
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}
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private async Task<string> CallSomethingAsync(TheViewModel vm)
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{
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await Task.Delay(10);
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vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
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await Task.Delay(1000);
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return $"Never switched contexts.";
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}
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}
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}

‎AsyncTesting/Commands/SaveCrossContext.cs

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using AsyncTesting.Models;
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using System;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Windows.Input;
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namespace AsyncTesting.Commands
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{
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public class SaveCrossContext : ICommand
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{
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public event EventHandler CanExecuteChanged;
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public bool CanExecute(object parameter)
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{
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return true;
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}
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/// <summary>
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/// Blows up because trying to access GUI from wrong context.
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/// </summary>
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/// <param name="parameter"></param>
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public async void Execute(object parameter)
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{
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TheViewModel vm = parameter as TheViewModel;
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vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
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//Switching to default context here.
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string msg = await CallSomethingAsync(vm).ConfigureAwait(continueOnCapturedContext: false);
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//Still on default context, no access to GUI thread. Boom.
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vm.UpdateDescription(msg);
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}
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private async Task<string> CallSomethingAsync(TheViewModel vm)
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{
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await Task.Delay(10).ConfigureAwait(continueOnCapturedContext:false);
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vm.CurrentThreadID = Thread.CurrentThread.ManagedThreadId;
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await Task.Delay(1000);
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return "You will never see this message";
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}
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}
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}

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