LazyProxy

LazyProxy is a lightweight library allowing to build a lazy proxy type for some interface T at runtime. The proxy type implements this interface and is initialized by the Lazy<T> argument. All method and property invocations route to the corresponding members of the lazy's Value.

For illustration, assume there is the following interface:

public interface IMyService
{
    void Foo();
}

Then the generated lazy proxy type looks like this:

// In reality, the implementation is a little more complicated,
// but the details are omitted for ease of understanding.
public class LazyProxyImpl_IMyService : IMyService
{
    private Lazy<IMyService> _service;

    public LazyProxyImpl_IMyService(Lazy<IMyService> service)
    {
        _service = service;
    }

    public void Foo() => _service.Value.Foo();
}

Get Packages

The library provides in NuGet.

Install-Package LazyProxy

Get Started

Consider the following service:

public interface IMyService
{
    void Foo();
}

public class MyService : IMyService
{
    public MyService() => Console.WriteLine("Ctor");
    public void Foo() => Console.WriteLine("Foo");
}

A lazy proxy instance for this service can be created like this:

var lazyProxy = LazyProxyBuilder.CreateInstance<IMyService>(() =>
{
    Console.WriteLine("Creating an instance of the real service...");
    return new MyService();
});

Console.WriteLine("Executing the 'Foo' method...");
lazyProxy.Foo();

The output for this example:

Executing the 'Foo' method...
Creating an instance of the real service...
Ctor
Foo

Features

Currently, LazyProxy supports the following:

Void/Result methods;
Async methods;
Generic methods;
Generic interfaces;
Ref/Out parameters;
Parameters with default values;
Parent interface members;
Indexers;
Properties (getters and setters);
Thread-safe proxy generation.

Not supported yet:

Events

Lazy Dependency Injection

Lazy proxies can be used for IoC containers to improve performance by changing resolution behavior.

More info can be found in the article about Lazy Dependency Injection for .NET.

Lazy injection for Unity container

Lazy injection for Autofac container

License