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amaitlandamaitland
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AnyCpu - Add ModuleInitializer to resolve AnyCpu dlls at runtime
- Checks if the Assembly.GetEntryAssembly() is MSIL - Change CefSharp.Core.csproj to use LangVersion 9 so we can get the compiler to output the ModuleInitializer - Remove CefSharpPlatformCheck and other CefSharpAnyCpuSupport checks - CefSharp.Common.targets still has CefSharpAnyCpuSupport references for backwards compatibility with those with it set and Prefer32bit The default behaviour for this case is to simply copy the 32bit libs - Calling CefRuntime.SubscribeAnyCpuAssemblyResolver multiple times now will simply Unsubscribe the previous resolver This change should remove the need for users to perform any action when supporting AnyCpu.
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‎CefSharp.Core/CefRuntimeAnyCpuInitializer.cs‎

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// Copyright © 2022 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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using System.Reflection;
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using System.Runtime.CompilerServices;
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namespace CefSharp
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{
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/// <summary>
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/// When targeting NETFRAMEWORK this Module Initializer
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/// will call <see cref="CefRuntime.SubscribeAnyCpuAssemblyResolver(string)"/>
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/// when the <see cref="Assembly.GetEntryAssembly"/> has a <see cref="ProcessorArchitecture.MSIL"/>.
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/// </summary>
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public static class CefRuntimeAnyCpuInitializer
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{
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/// <summary>
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/// True if the AnyCpu resolver was attached via this Module Initializer
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/// </summary>
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public static bool AssemblyResolverAttached { get; private set; }
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[ModuleInitializer]
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internal static void ModuleInitializer()
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{
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var executingAssembly = Assembly.GetEntryAssembly();
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//The GetEntryAssembly method can return null when a managed assembly has been loaded from an unmanaged application.
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//https://docs.microsoft.com/en-us/dotnet/api/system.reflection.assembly.getentryassembly
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if (executingAssembly != null && CefRuntime.SubscribeToAnyCpuResolverInModuleInitializer)
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{
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var name = executingAssembly.GetName();
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if (name.ProcessorArchitecture == ProcessorArchitecture.MSIL)
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{
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if (!CefRuntime.IsAnyCpuAssemblyResolverAttached)
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{
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AssemblyResolverAttached = true;
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CefRuntime.SubscribeAnyCpuAssemblyResolver();
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}
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}
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}
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}
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}
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}

‎CefSharp.Core/CefSharp.Core.csproj‎

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Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net452</TargetFramework>
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<OutputType>Library</OutputType>
@@ -8,6 +8,7 @@
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<SignAssembly>true</SignAssembly>
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<AssemblyOriginatorKeyFile>..\CefSharp.snk</AssemblyOriginatorKeyFile>
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<PlatformTarget>AnyCPU</PlatformTarget>
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<LangVersion>9</LangVersion>
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<!--
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Stop MSBuild from appending TargetFramework to output path.
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Remove if we use TargetFrameworks
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<ItemGroup>
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<Compile Remove="BrowserSettings.netcore.cs" />
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<Compile Remove="Initializer.cs" />
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<Compile Remove="ModuleInitializerAttribute.cs" />
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<Compile Remove="PostData.netcore.cs" />
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<Compile Remove="PostDataElement.netcore.cs" />
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<Compile Remove="Request.netcore.cs" />

‎CefSharp/CefRuntime.cs‎

Lines changed: 31 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -14,7 +14,27 @@ namespace CefSharp
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/// </summary>
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public static class CefRuntime
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{
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private static ResolveEventHandler currentDomainAssemblyResolveHandler;
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private static ResolveEventHandler CurrentDomainAssemblyResolveHandler;
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/// <summary>
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/// For AnyCPU support a ModileInitializer in CefSharp.Core.dll will run when the dll is
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/// loaded and call <see cref="SubscribeAnyCpuAssemblyResolver(string)"/> if tge dll is <see cref="ProcessorArchitecture.MSIL"/>
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/// Set this to false before attempting to load any other CefSharp resources to avoid attaching the resolver.
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/// Alternatively call <see cref="UnsubscribeAnyCpuAssemblyResolver"/> to remove the resolver.
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/// </summary>
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public static bool SubscribeToAnyCpuResolverInModuleInitializer { get; set; } = true;
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/// <summary>
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/// Check if an AnyCpu resolver has already been attached (subscribed to the
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/// <see cref="AppDomain.AssemblyResolve"/> event for the <see cref="AppDomain.CurrentDomain"/>
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/// </summary>
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public static bool IsAnyCpuAssemblyResolverAttached
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{
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get
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{
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return CurrentDomainAssemblyResolveHandler != null;
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}
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}
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/// <summary>
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/// When using AnyCPU the architecture specific version of CefSharp.Core.Runtime.dll
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/// based on <see cref="Environment.Is64BitProcess"/>.
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/// This method MUST be called before you call Cef.Initialize, create your first ChromiumWebBrowser instance, basically
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/// before anything CefSharp related happens. This method is part of CefSharp.dll which is an AnyCPU library and
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/// doesn't have any references to the CefSharp.Core.Runtime.dll so it's safe to use.
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/// doesn't have any references to the CefSharp.Core.Runtime.dll so it's safe to use. Multiple calls will
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/// result in <see cref="UnsubscribeAnyCpuAssemblyResolver"/> being called if <see cref="IsAnyCpuAssemblyResolverAttached"/>
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/// is true.
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/// </summary>
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/// <param name="basePath">
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/// The path containing the x64/x86 folders which contain the CefSharp/CEF resources.
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/// If null then AppDomain.CurrentDomain.SetupInformation.ApplicationBase will be used as the path.
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/// (</param>
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/// </param>
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public static void SubscribeAnyCpuAssemblyResolver(string basePath = null)
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{
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if(currentDomainAssemblyResolveHandler != null)
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if(IsAnyCpuAssemblyResolverAttached)
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{
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throw new Exception("UseAnyCpuAssemblyResolver has already been called, call ");
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UnsubscribeAnyCpuAssemblyResolver();
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}
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if(basePath == null)
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{
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basePath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
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}
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currentDomainAssemblyResolveHandler = (sender, args) =>
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CurrentDomainAssemblyResolveHandler = (sender, args) =>
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{
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if (args.Name.StartsWith("CefSharp.Core.Runtime"))
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{
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return null;
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};
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AppDomain.CurrentDomain.AssemblyResolve += currentDomainAssemblyResolveHandler;
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AppDomain.CurrentDomain.AssemblyResolve += CurrentDomainAssemblyResolveHandler;
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}
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/// <summary>
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/// </summary>
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public static void UnsubscribeAnyCpuAssemblyResolver()
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{
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AppDomain.CurrentDomain.AssemblyResolve -= currentDomainAssemblyResolveHandler;
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AppDomain.CurrentDomain.AssemblyResolve -= CurrentDomainAssemblyResolveHandler;
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currentDomainAssemblyResolveHandler = null;
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CurrentDomainAssemblyResolveHandler = null;
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}
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/// <summary>

‎NuGet/CefSharp.Common.targets‎

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@@ -138,16 +138,6 @@
138138
https://github.com/dotnet/project-system/issues/4158
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-->
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<CefSharpPropertiesLoaded>true</CefSharpPropertiesLoaded>
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<!--
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For PackageReference library projects where buildTransitive is supported we'll default to setting CefSharpAnyCpuSupport to true
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This should only require WinExe and Exe projects to specify CefSharpAnyCpuSupport rather than every project in a solution.
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Only for PackageReference projects where NuGetToolVersion > 5.0 and OutputType is library.
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Defaulting CefSharpAnyCpuSupport to true is simpler than modifying the already complex Condition for the CefSharpPlatformCheck
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target below.
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https://github.com/cefsharp/CefSharp/issues/3622
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-->
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<CefSharpAnyCpuSupport Condition="'$(CefSharpAnyCpuSupport)' != 'true' AND '$(NuGetProjectStyle)' == 'PackageReference' AND $(NuGetToolVersion) > '5.0' AND '$(OutputType)' == 'Library'">true</CefSharpAnyCpuSupport>
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</PropertyGroup>
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153143
<Choose>
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</Choose>
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<!--
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This Transform is no longer used by default, the project was changed to use a ModuleInitializer to resolve the references
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at runtime. The transform remains here for anyone wishing to manually call
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For AnyCPU we use a Transform to add entries to app.config if possible
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Otherwise throw error to alert user they need to perform additional action
364355
-->
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<UsingTask TaskName="TransformXml" AssemblyFile="$(CefSharpTransformXmlDllPath)" Condition="Exists('$(CefSharpTransformXmlDllPath)') AND '$(CefSharpPlatformTarget)' == 'AnyCPU' AND '$(CefSharpAnyCpuSupport)' == '' AND '$(CefSharpBuildAction)' != 'NoAction'" />
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367-
<Target Name="CefSharpCommonAnyCPUConfigTransform" AfterTargets="_CopyAppConfigFile" Condition="'@(AppConfigWithTargetPath)' != '' AND Exists('$(CefSharpTransformXmlDllPath)') AND '$(CefSharpPlatformTarget)' == 'AnyCPU' AND '$(CefSharpAnyCpuSupport)' == '' AND '$(CefSharpBuildAction)' != 'NoAction'">
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<Target Name="CefSharpCommonAnyCPUConfigTransform">
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<TransformXml Source="@(AppConfigWithTargetPath->'$(OutDir)%(TargetPath)')" Transform="$(MSBuildThisFileDirectory)..\build\app.config.x86.transform" Destination="@(AppConfigWithTargetPath->'$(OutDir)%(TargetPath)')"/>
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<TransformXml Source="@(AppConfigWithTargetPath->'$(OutDir)%(TargetPath)')" Transform="$(MSBuildThisFileDirectory)..\build\app.config.x64.transform" Destination="@(AppConfigWithTargetPath->'$(OutDir)%(TargetPath)')"/>
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</Target>
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372-
<Target Name="CefSharpPlatformCheck" BeforeTargets="ResolveAssemblyReferences" Condition="('@(AppConfigWithTargetPath)' == '' OR !Exists('$(CefSharpTransformXmlDllPath)')) AND '$(CefSharpPlatformTarget)' == 'AnyCPU' AND '$(CefSharpAnyCpuSupport)' != 'true' AND '$(CefSharpBuildAction)' != 'NoAction'">
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<Error Text="$(MSBuildThisFileName) is unable to proceeed as your current PlatformTarget is '$(CefSharpPlatformTarget)'. To target AnyCPU please read https://github.com/cefsharp/CefSharp/issues/1714. Alternatively change your PlatformTarget to x86 or x64 and the relevant files will be copied automatically." HelpKeyword="CefSharpSolutionPlatformCheck" />
374-
</Target>
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376363
<!--
377364
Issue https://github.com/dotnet/project-system/issues/4158
378365
The None/Content entries aren't picked up as the .targets file doesn't exist before the Nuget restore (only when using packages.config)

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