public AppBuilder UsePlatformDetect()
    {
      OperatingSystemType os = this.RuntimePlatform.GetRuntimeInfo().OperatingSystem;
      this.LoadAssembliesInDirectory();
      Assembly[] loadedAssemblies1 = this.RuntimePlatform.GetLoadedAssemblies();
      Func<Assembly, IEnumerable<ExportWindowingSubsystemAttribute>> func1 = (Func<Assembly, IEnumerable<ExportWindowingSubsystemAttribute>>) (assembly => assembly.GetCustomAttributes<ExportWindowingSubsystemAttribute>());
      Func<Assembly, IEnumerable<ExportWindowingSubsystemAttribute>> collectionSelector1;
      ExportWindowingSubsystemAttribute windowingSubsystemAttribute = ((IEnumerable<Assembly>) loadedAssemblies1).SelectMany(collectionSelector1, (assembly, attribute) => new
      {
        assembly = assembly,
        attribute = attribute
      }).Where(_param1 =>
      {
        if (_param1.attribute.RequiredOS == os)
          return this.CheckEnvironment(_param1.attribute.EnvironmentChecker);
        return false;
      }).OrderBy(_param1 => _param1.attribute.Priority).Select(_param1 => _param1.attribute).FirstOrDefault<ExportWindowingSubsystemAttribute>();
      if (windowingSubsystemAttribute == null)
        throw new InvalidOperationException("No windowing subsystem found. Are you missing assembly references?");
      Assembly[] loadedAssemblies2 = this.RuntimePlatform.GetLoadedAssemblies();
      Func<Assembly, IEnumerable<ExportRenderingSubsystemAttribute>> func2 = (Func<Assembly, IEnumerable<ExportRenderingSubsystemAttribute>>) (assembly => assembly.GetCustomAttributes<ExportRenderingSubsystemAttribute>());
      Func<Assembly, IEnumerable<ExportRenderingSubsystemAttribute>> collectionSelector2;
      ExportRenderingSubsystemAttribute renderingSubsystemAttribute = ((IEnumerable<Assembly>) loadedAssemblies2).SelectMany(collectionSelector2, (assembly, attribute) => new
      {
        assembly = assembly,
        attribute = attribute
      }).Where(_param1 =>
      {
        if (_param1.attribute.RequiredOS == os)
          return this.CheckEnvironment(_param1.attribute.EnvironmentChecker);
        return false;
      }).Where(_param1 =>
      {
        if (_param1.attribute.RequiresWindowingSubsystem != null)
          return _param1.attribute.RequiresWindowingSubsystem == windowingSubsystemAttribute.Name;
        return true;
      }).OrderBy(_param1 => _param1.attribute.Priority).Select(_param1 => _param1.attribute).FirstOrDefault<ExportRenderingSubsystemAttribute>();
      if (renderingSubsystemAttribute == null)
        throw new InvalidOperationException("No rendering subsystem found. Are you missing assembly references?");
      this.UseWindowingSubsystem((Action) (() => windowingSubsystemAttribute.InitializationType.GetRuntimeMethod(windowingSubsystemAttribute.InitializationMethod, Type.EmptyTypes).Invoke((object) null, (object[]) null)), windowingSubsystemAttribute.Name);
      this.UseRenderingSubsystem((Action) (() => renderingSubsystemAttribute.InitializationType.GetRuntimeMethod(renderingSubsystemAttribute.InitializationMethod, Type.EmptyTypes).Invoke((object) null, (object[]) null)), renderingSubsystemAttribute.Name);
      return this;
    }