CODEWITHSUNDEEP
c#typesuwp
LaVINCENT
LaVINCENT

Reputation: 3

How to change type in all code

I'm studing the UWP coding in C#. I've done a little Grid with some rectangles:

Rectangle r = new Rectangle();

I've done it in many methods of class. I would create a generic type (for example as class or a variable) to fast change all Rectangles in Ellipse (for example), not at runtime. I mean something like:

Type ShapeType = typeof(Rectangle);

and create:

ShapeType figure = new ShapeType(); ...

but tomorrow be able to change

Type ShapeType = typeof(Rectangle);

in

Type ShapeType = typeof(Ellipse);

and change all the shapes in my code. Is this possible? How can I create a class "Rectangle-like" or "Ellipse-like" ?

Thank you

Marked as duplicate of: "Get a new object instance from a Type One may not always know the Type of an object at compile-time, but may need to create an instance of the Type. How do you get a new object instance from a Type?"

Where I've written that I want create an object at runtime? Or also only that i want create an object? My question is about "How to change (from code) easily the type defined in many line of code creating a generic type?"

Upvotes: 0

Views: 111

Answers (1)

Martin Zikmund
Martin Zikmund

Reputation: 39102

The simplest solution would be to have a factory method that would create a new instance of the element you decide to use.

It could look like this:

private Shape CreateShape() => new Rectangle();

Because all Shape elements in UWP have Shape as a base class, you can use it as the return type of your method and as a "base" type in all places you use the shape.

You can now replace all the lines, where you created instances of Rectangle with the following:

var shape = CreateShape();

If you later decide that you want to change the type to Ellipse, you just change the code in one place - in the CreateShape method:

private Shape CreateShape() => new Ellipse();

Upvotes: 1

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