我创建的新班级无法创建新笔

Question

I just made a new class, but I can't seem to create a new Pen or Graphics or whatever... I openend a new project, and added a new class. So when I try to type:

Pen mypen = new Pen(Color.Black); 

There's an error saying:

"The type or namespace name 'Pen' could not be found (are you missing a using directive or an assembly reference?)"

So what should I do now?

Answer 1

You have to add System.Drawing.dll as a reference, then add a using directive at the top of the .cs file:

using System.Drawing;

That should fix your problem!

Answer 2

You need to add a using directive at the top of your file:

using System.Drawing;

Also, within the IDE, if you click on the Pen type that has the error, you will see a blue rectangle below it, hover your mouse over that and you will get a menu that gives you options to automatically do that:

You can also bring up this binding menu using Shift + Alt + F10