All products / Saraff.IoC

Injection Patterns

Constructor Injection

internal sealed class MyCustomClass {

    [IoC.ServiceRequired]
    public MyCustomClass(IService1 svc1/* , ... */) { // type of arguments of constructor can be is a interface or/and class
    }

    // ...
}

internal sealed class Service2:Component, IService2 {

    [IoC.ServiceRequired]
    public Service2(IService1 svc1/* , ... */) { // type of arguments of a constructor can be is a interface or/and a class

    }

    // ...
}

Property Setter Injection

internal sealed class MyCustomClass {

    // ...

    [IoC.ServiceRequired]
    public IService1 Svc1 { // type of a property can be only is a interface
        get;
        set;
    }

    // ...

}

internal sealed class Service2:Component, IService2 {

    // ...

    [IoC.ServiceRequired]
    public IService1 Svc1 { // type of a property can be only is a interface
        get;
        set;
    }

    // ...
}

Method Injection

Available for a components that implements a service’s interfaces

[IoC.ProxyRequired] // The Method Injection pattern require uses a proxy for injections
internal sealed class Service2:Component, IService2 {

    // ...

    public TResult MethodA<T1, T2, TResult>(
        T1 val1, 
        [IoC.ServiceRequired]T2 val2, // type of arguments can be is a interface or/and a class
        [IoC.ServiceRequired]IService1 service1, 
        [IoC.ServiceRequired]IService2 service2 = null) {

        // ...

    }

    // ...
}

Lazy Injection

You may defer time to injection. It may be use to resolve cyclic dependency or create expensive resources. For this you need to use a IoC.Lazy delegate.

internal sealed class MyCustomClass {

    [IoC.ServiceRequired]
    public MyCustomClass(IoC.Lazy<IService1> svc1/* , ... */) { // type of arguments of constructor can be is a interface or/and class
    }

    [IoC.ServiceRequired]
    public IoC.Lazy<IService1> Svc1 { // type of a property can be only is a interface
        get;
        set;
    }

    public TResult MethodA<T1, T2, TResult>(
        T1 val1, 
        [IoC.ServiceRequired]IoC.Lazy<T2> val2, // type of arguments can be is a interface or/and a class
        [IoC.ServiceRequired]IoC.Lazy<IService2> service2 = null) {

        // ...

    }
    
    // ...
}

IServiceProvider

internal sealed class Service2:Component, IService2 {

    // ...

    private IService1 Svc2 {
        get {
            return this.GetService(typeof(IService1)) as IService1;
            // if you want get instance for specific class (context binding), use a IoC.IContextBinder<,>
            return this.GetService(typeof(IoC.IContextBinder<IService1,Service2>)) as IService1;
            // or
            return this.GetService(typeof(IoC.IContextBinder<,>).MakeGenericType(typeof(IService1),this.GetType())) as IService1;
        }
    }

    // ...

}

using(var _container = new IoC.ServiceContainer()) {

    //...

    var _provider = _container as IServiceProvider;
    var _svc = _provider.GetService(typeof(IService1)) as IService1;

    //...
}