Мы использовали WIX 3.5 (сборка № 1811) и создали собственное действие, построенное с использованием Visual Studio 2008 и с целевой платформой как .Net 3.5. Раньше это прекрасно работало, пока мы не создали пользовательское действие с использованием Visual Studio 2010 и целевой платформы, как .Net 4.0.

WIX не может вызвать пользовательское действие, мы получаем следующую ошибку:

  SFXCA: Extracting custom action to temporary directory: C:\Windows\Installer\MSI69BD.tmp-\
    SFXCA: Binding to CLR version v2.0.50727
    Calling custom action SomeCompany.SomeProduct.InstallerPlugin!SomeCompany.SomeProduct.InstallerPlugin.XYZProductCustomAction.ABCMethod
    Error: could not load custom action class SomeCompany.SomeProduct.InstallerPlugin.XYZProductCustomAction from assembly: SomeCompany.SomeProduct.InstallerPlugin

    System.BadImageFormatException: Could not load file or assembly 'SomeCompany.SomeProduct.InstallerPlugin' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.

    File name: 'SomeCompany.SomeProduct.InstallerPlugin'
       at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
       at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
       at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
       at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
       at System.AppDomain.Load(String assemblyString)
       at Microsoft.Deployment.WindowsInstaller.CustomActionProxy.GetCustomActionMethod(Session session, String assemblyName, String className, String methodName)