Base wrapper class and interface to seamlessly wrap any .NET type.
The Wrapper<T> class comes with a few overloads such as Equals, GetHashCode, ToString and others that are automatically mapped to the wrapped object. This allows you to use the wrapper as if it was the wrapped object.
You can access the wrapped object using the Unwrapped property or the explicit casting operator.
var actualObject = wrapper.Unwrapped;
var actualObject = (ActualType)wrapper;The Wrapper<T> class is useful when you want to add functionality to an existing class without modifying it. It is also useful when you want to wrap a class that you don't own.
The most common use case is when you need to mock a class that is not virtual, abstract or lacks an interface. You can create a wrapper that inherits from the class you want to mock and map its methods and properties.
If you need a working real-world example, Wrapper<T> is used extensively in the ToolBX.NetAbstractions library.
First, create a class that inherits from Wrapper<T> and implements IWrapper<T>.
public class MyWrapper : Wrapper<MyType>
{
public int MyProperty
{
get => Unwrapped.MyProperty;
set => Unwrapped.MyProperty = value;
}
//TODO : Map other properties and methods to the wrapped object
public MyWrapper(MyType wrappedObject) : base(wrappedObject)
{
}
}Then, you can use the wrapper as if it was the wrapped object.
var wrapper = new MyWrapper(new MyType());
wrapper.MyProperty = 42;If the wrapped object implements IDisposable, the wrapper should also implement IDisposable and dispose the wrapped object when it is called but this mecahnism isn't built-in with Wrapper<T> so you have to do it yourself.
public class MyWrapper : Wrapper<MyType>, IDisposable
{
public MyWrapper(MyType wrappedObject) : base(wrappedObject)
{
}
public void Dispose()
{
Unwrapped.Dispose();
}
}