StructureMap Implementation

In MVC 5

• Get Structuremap package from NuGet
• Get Servicelocation package from NuGet
• Create folder DependencyInjection for Ioc Classes
• Copy the classes from old project ( DependencyScope, DependencyResolver)
• Copy DependencyScope and DependencyResolver into the folder ‘DependencyInjection‘
• Resolve classes names
• To resolve interface IDependencyScope Add references to
  • System.Web.Http
  • System.Web.Http.WebHost
• Create IocConfig (copy code from the old project)
• Resolve Dependencies
• Add IocConfig call to Global.asax.cs (reference newly created DependencyResolver Class)

       protected void Application_Start()
        {
            var container = IocConfig.Setup();
            System.Web.Mvc.DependencyResolver.SetResolver(new DependencyResolver(container));
            GlobalConfiguration.Configuration.DependencyResolver = new DependencyResolver(container);

• Different configurations for API project
• For API project you may not need this statement

	System.Web.Mvc.DependencyResolver.SetResolver(new DependencyInjection.DependencyResolver(container));

• For static methods concrete object can be get using the similar statement given below

	var storeService = IocConfig.Setup().GetInstance<IUserStoreService<ApplicationUser>>();

In MVC 6

• Create IoC project in solution
• install StructureMap.Microsoft.DependencyInjection nuget package in IoC project
• Add project references to IoC but not the UI ones
• create a class file and write the code below

    public class InstanceScanner : Registry
    {
        public static IContainer Setup()
        {
            var container = new Container(
                x =>
                {
                    x.Scan(k =>
                    {
                        k.TheCallingAssembly();
                        k.WithDefaultConventions();   // if interface has I in front of implementation you don't need to define again
                        k.AssembliesFromApplicationBaseDirectory();
                    });
                 //   x.For<ITest>().Use<Test>();     //If naming conventions are not implemented 
                }
                );
            return container;
        }
    }

• in UI (Main) project add IoC project reference
• in Startup.cs file

  public IServiceProvider ConfigureServices(IServiceCollection services) // THIS CAN BE VOID BUT CHANGE IT TO RETURN IServiceProvider
        {
            // Add framework services.
            services.AddMvc();
           return ConfigureIoC(services);
        }
  public IServiceProvider ConfigureIoC(IServiceCollection services)
        {
           var  container = InstanceScanner.Setup();    // referencing the code above 
           container.Populate(services);
           return container.GetInstance<IServiceProvider>();
        }

• That's it.
  • If an interface is starts with "I" and class name you don't need to do anything.
  • If naming conventions are not implemented uncomment the relevant part above.

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Note :

For<MyContext>().Use(() => new MyContext("LocalhostConnString"));

If you give StructureMap an object instance, it will treat that instance as a singleton and return the same one every time. If instead you give it a lambda that creates an instance, it will run that lambda each time the type is requested.