manually invoke property injection with AutoFac

Question

Suppose all the dependencies have already been registered at the beginning of the program. At later points in the program how can you use AutoFac to create a new object with a parameterless constructor and inject the registered properties into the object?

Answer 1

You can register your object in the container with PropertiesAutowired then use resolve when you need an instace:

ContainerBuilder builder = new ContainerBuilder();
// builder register other dependencies
builder.RegisterType<MyObject>().PropertiesAutowired();

var container = builder.Build();

var myObject = container.Resolve<MyObject>(); //the properties will be filled

Or if you don't want to register in the container your can use the InjectProperties method on an existing instance:

ContainerBuilder builder = new ContainerBuilder();
// builder register other dependencies

var container = builder.Build();

var myObject = new MyObject();
container.InjectProperties(myObject); //the properties will be filled