DDD Combat 8_2 uses unity Dependency Injection to implement the configuration of the interface corresponding to the implementation class

1. Create a new Diservice class under the Util class library

    /// <summary>    /// create a class that corresponds to the key    of the object inside the diservices configured in the configuration file /// </summary>     Public class Diservice    {        publicstringgetset;}          Public string Get Set ; }    }

2 Configuring interfaces and implementation classes to be dependent on injection in the Webapi Appsettings.json file

3 Installing Unity.container and unity.servicelocator two packages for Util Class library project NuGet

4. Create a service locator Servicelocator class

namespaceutil{ Public classServicelocator:iserviceprovider//IServiceProvider This interface is the system's own    {        Private ReadOnlyIunitycontainer container;  PublicServicelocator () {container=NewUnityContainer (); //to use Jobject, you must install the Newtonsoft.json package//read the configuration file to get a JSON object            varJsonservices = Jobject.parse (File.readalltext ("Appsettings.json"))["diservices"]; //turn the jsonservices above into a collection of list<diservice>            varRequestservices = jsonconvert.deserializeobject<list<diservice>>(Jsonservices.tostring ()); //Traversing service Objects            foreach(varRequestServiceinchrequestservices) {                //registering with the containercontainer.            Registertype (Type.GetType (Requestservice.interfacetype), Type.GetType (Requestservice.implementationtype)); }        }         PublicT getservice<t>()        {            returnContainer. Resolve<t>(); }        //The following method is required for the IServiceProvider interface.         Public ObjectGetService (Type servicetype) {returncontainer.        Resolve (servicetype); }                 PublicT getservice<t>(parameteroverrides parameters) {returnContainer. Resolve<t>(parameters); }    }}

5 using the Service locator to practice dependency injection

namespaceproduct.webapi.controllers{[Produces ("Application/json")] [Route ("api/product")]     Public classProductcontroller:controller {//once executed, this parameterless constructor completes the mapping of the interface and implementationServicelocator Servicelocator =NewServicelocator ();        [HttpPost] [Route ("addproduct")]         Publicresultentity<BOOL>addproduct ([frombody] addproductspudto addproductspudto) {varresult =Newresultentity<BOOL>(); //var productdbcontext =new productefcorecontext (); //var irepsotory = new Efcorerepository (productdbcontext); //var iproductrepsitory = new Productefcorerepository (productdbcontext);            varProductdbcontext = servicelocator.getservice<iproductcontext>(); //the following new Unity.Resolution.ParameterOverrides () {{"Context", productdbcontext}}//{ } there is {} because it is a parameters description may have more than one parameter object//{"Context", productdbcontext} The first context is because the formal parameter of the public efcorerepository (DbContext context) is the context//The value is the productdbcontext we're going to pass in.            varIrepsotory = servicelocator.getservice<irepository> (NewUnity.Resolution.ParameterOverrides () {{"Context", Productdbcontext}}); varIproductrepsitory = servicelocator.getservice<iproductrepository> (NewUnity.Resolution.ParameterOverrides () {{"Context", Productdbcontext}}); varAddproductspuusecase =Newaddproductspuusecase (Irepsotory, iproductrepsitory); Try{result=Addproductspuusecase.                Addproduct (addproductspudto); Result. Issuccess=true; Result.count=1; Result. MSG="Shelves Product Success"; }            Catch(Exception ex) {result. ErrorCode= -; Result. MSG=Ex.            Message; }            returnresult; }          }}

DDD Combat 8_2 uses unity Dependency Injection to implement the configuration of the interface corresponding to the implementation class