Question

I saw this code:

this.CreateGraphics().DrawRectangle( Pens.Black, new Rectangle( 0, 0, 200, 100 ) );

CreateGraphics() is a method, but it acts like a class with static voids. How can I create this in my code? I don’t know how this technique can be called…

Answer 1

This is called Factory Method (it’s one of design patterns). Basically you create a method which will return new instances of class e.g.:

public class Graphics 
{
    public static Graphics CreateGraphics()
    {
        return new Graphics();
    }

    // ... other methods etc ...
    public bool OtherMethod()
    {
        return false;
    }
}
// then you can do Graphics.CreateGraphics().OtherMethod();

UPDATE

You can use this design patter in other places, all you need to do is to create a method which will return new instance of class (CreateGraphics method):

public class MyClass 
{
    public static Graphics CreateGraphics()
    {
        return new Graphics();
    }

    // ... other methods etc ...
    public void MyOtherMethod()
    {
        this.CreateGraphics().Something();
    }
}