Application Compatibility Flags Howto Sample for .NET Core

Compatibility/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<!--
+Licensed to the .NET Foundation under one or more agreements.
+The .NET Foundation licenses this file to you under the MIT license.
+See the LICENSE file in the project root for more information.
+-->
+
+<!-- 
+  This file *must* be named App.config, and not App1.config etc. 
+-->
+<!-- 
+This is the list of application compatibility switches in WPF that are set via App.Config. 
+The values shown below are the defaults for the respective switch. 
+-->
+<configuration>
+  <appSettings>
+    <!-- Defined in System.Windows.CoreCompatibilityPreferences -->
+
+    <!--https://docs.microsoft.com/en-us/dotnet/api/system.windows.corecompatibilitypreferences.isaltkeyrequiredinaccesskeydefaultscope?view=netcore-3.0-->
+    <!--<add key="IsAltKeyRequiredInAccessKeyDefaultScope" value="false"/>-->
+
+    <!--https://docs.microsoft.com/en-us/dotnet/api/system.windows.corecompatibilitypreferences.enablemultimonitordisplayclipping?view=netcore-3.0#System_Windows_CoreCompatibilityPreferences_EnableMultiMonitorDisplayClipping-->
+    <!--<add key="EnableMultiMonitorDisplayClipping" value="null"/>-->
+
+    <!--GlyphRun.ComputeInkBoundingBox is supposed to return a box that contains
+    all the ink in the GlyphRun, but in some circumstances it computes a
+    box that is too small.  This was "fixed" in 4.5 by inflating the box
+    slightly.  Apps that depend on the old non-inflated result can opt out
+    of the fix by setting this to 'false'-->
+    <!--<add key="IncludeAllInkInBoundingBox" value="true"/>-->
+
+
+
+    <!-- Defined in System.Windows.BaseCompatibilityPreferences -->
+
+    <!--https://docs.microsoft.com/en-us/dotnet/api/system.windows.basecompatibilitypreferences.reusedispatchersynchronizationcontextinstance?view=netframework-4.8#System_Windows_BaseCompatibilityPreferences_ReuseDispatcherSynchronizationContextInstance-->
+    <!--<add key="ReuseDispatcherSynchronizationContextInstance" value="false"/>-->
+
+    <!--https://docs.microsoft.com/en-us/dotnet/api/system.windows.basecompatibilitypreferences.flowdispatchersynchronizationcontextpriority?view=netframework-4.8#System_Windows_BaseCompatibilityPreferences_FlowDispatcherSynchronizationContextPriority-->
+    <!--<add key="FlowDispatcherSynchronizationContextPriority" value="true"/>-->
+
+    <!--https://docs.microsoft.com/en-us/dotnet/api/system.windows.basecompatibilitypreferences.inlinedispatchersynchronizationcontextsend?view=netframework-4.8#System_Windows_BaseCompatibilityPreferences_InlineDispatcherSynchronizationContextSend-->
+    <!--<add key="InlineDispatcherSynchronizationContextSend" value="true"/>-->
+
+    <!--https://docs.microsoft.com/en-us/dotnet/api/system.windows.basecompatibilitypreferences.handledispatcherrequestprocessingfailure?view=netframework-4.8#System_Windows_BaseCompatibilityPreferences_HandleDispatcherRequestProcessingFailure-->
+    <!--<add key="HandleDispatcherRequestProcessingFailure" value="Continue"/>-->
+
+    <!--Instructs WPF to not attempt to set an equivalent XML package signature method for a given digest hash algorithm.
+    This affects the signing and digest methods used in the packaging APIs.  With this set to false, signature methods
+    will always be SHA1.-->
+    <!--<add key="MatchPackageSignatureMethodToPackagePartDigestMethod" value="true"/>-->
+
+
+    <!-- Defined in System.Windows.FrameworkCompatibilityPreferenes -->
+
+    <!--https://docs.microsoft.com/en-us/dotnet/api/system.windows.frameworkcompatibilitypreferences.areinactiveselectionhighlightbrushkeyssupported?view=netframework-4.8#System_Windows_FrameworkCompatibilityPreferences_AreInactiveSelectionHighlightBrushKeysSupported-->
+    <!--<add key="AreInactiveSelectionHighlightBrushKeysSupported" value="true"/>-->
+
+    <!--https://docs.microsoft.com/en-us/dotnet/api/system.windows.frameworkcompatibilitypreferences.keeptextboxdisplaysynchronizedwithtextproperty?view=netframework-4.8#System_Windows_FrameworkCompatibilityPreferences_KeepTextBoxDisplaySynchronizedWithTextProperty-->
+    <!--<add key="KeepTextBoxDisplaySynchronizedWithTextProperty" value="true"/>-->
+
+    <!--https://docs.microsoft.com/en-us/dotnet/api/system.windows.frameworkcompatibilitypreferences.shouldthrowoncopyorcutfailure?view=netframework-4.8#System_Windows_FrameworkCompatibilityPreferences_ShouldThrowOnCopyOrCutFailure-->
+    <!--<add key="ShouldThrowOnCopyOrCutFailure" value="false"/>-->
+
+    <!-- 
+      Possible values are:
+        - Throw (.NET 4.0 behavior)
+        - Allow (default .NET 4.5+, .NET core behavior)
+        - Disallow
+    -->
+    <!--<add key="HandleTwoWayBindingToPropertyWithNonPublicSetter" value="Allow"/>-->
+
+    <!--There is a bug in the Windows desktop window manager which can cause
+    incorrect z-order for windows when several conditions are all met:
+    (a) windows are parented/owned across different threads or processes
+    (b) a parent/owner window is also owner of a topmost window (which needn't be visible)
+    (c) the child window on a different thread/process tries to show an owned topmost window
+        (like a popup or tooltip) using ShowWindow().
+    To avoid this window manager bug, this option causes SetWindowPos() to be used instead of
+    ShowWindow() for topmost windows, avoiding condition (c).  Ideally the window manager bug
+    will be fixed, but the risk of making a change there is considered too great at this time.-->
+    <!--<add key="UseSetWindowPosForTopmostWindows" value="false"/>-->
+
+    <!--VirtualizingStackPanel added support for virtualization-when-grouping in .NET 4.5,
+    generalizing and subsuming the support for virtualizing a TreeView that existed in .NET 4.0.
+    The 4.5 algorithm had many flaws, leading to infinite loops, scrolling
+    to the wrong place, and other bad symptoms.  DDCC is worried that fixing
+    these issues may introduce new compat problems, and asked for a way to opt out
+    of the fixes.  To opt out, set this flag to 'true' in App.Config-->
+    <!--<add key="VSP45Compat" value="false"/>-->
+
+  </appSettings>
+</configuration>

Compatibility/App.xaml

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+<!--
+Licensed to the .NET Foundation under one or more agreements.
+The .NET Foundation licenses this file to you under the MIT license.
+See the LICENSE file in the project root for more information.
+-->
+<Application x:Class="Wpf_AppCompat_Quirks.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:Wpf_AppCompat_Quirks"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>

Compatibility/App.xaml.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace Wpf_AppCompat_Quirks
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

Compatibility/AppCompat-Quirks.netcore.csproj

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+<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>AppCompat_Quirks</RootNamespace>
+    <UseWPF>true</UseWPF>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+  </PropertyGroup>
+
+</Project>

Compatibility/AppContextInformation.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Wpf_AppCompat_Quirks
+{
+    public class CompatSwitchInformation
+    {
+        public string Class { get; set; }
+        public string SwitchName { get; set; }
+        public string DefaultValue { get; set; }
+        public string SettingsSource { get; set; }
+    }
+}

Compatibility/MainWindow.xaml

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+<!--
+Licensed to the .NET Foundation under one or more agreements.
+The .NET Foundation licenses this file to you under the MIT license.
+See the LICENSE file in the project root for more information.
+-->
+<Window x:Class="Wpf_AppCompat_Quirks.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Wpf_AppCompat_Quirks"
+        mc:Ignorable="d"
+        Loaded="Window_Loaded"
+        Title="Application Compatibility Switches HOWTO Sample" Height="800" Width="900">
+    <ScrollViewer>
+        <StackPanel>
+            <Label>
+                <TextBlock TextWrapping="Wrap">
+                    See <Run FontWeight="Bold">runtimeconfig.template.json</Run> and <Run FontWeight="Bold">App.config</Run> for a list of supported application compatibility switches, alongwith the respective default values on .NET Core.
+                </TextBlock>
+            </Label>
+            <DataGrid ItemsSource="{Binding AppContextSwitches}" />
+            <DataGrid ItemsSource="{Binding CompatibilityPreferences}" />
+        </StackPanel>
+    </ScrollViewer>
+
+</Window>