Size, SizeF

How can you create, read and modify the Size struct? The Size struct is found in the System.Drawing namespace. A size represents a rectangular measurement.

We set the Width and Height properties on Size. We also see if it is empty with IsEmpty. As a struct, it is copied by value like other value types (such as int).

Size

First, any Size instance that has zero height and zero width is empty: IsEmpty will return true. You can get or set the Width and Height properties on Size at any time.

using System;
using System.Drawing;

Size size = new Size();
Console.WriteLine(size.IsEmpty);
Console.WriteLine(size);
Console.WriteLine(size.Width);
Console.WriteLine(size.Height);
size.Width = 1;
Console.WriteLine(size);

size = new Size(5, 10);
Console.WriteLine(size.IsEmpty);
Console.WriteLine(size);

Point point = new Point(5, 10);
size = new Size(point);
Console.WriteLine(size.IsEmpty);
Console.WriteLine(size);

size = new Size(-1, -1);
Console.WriteLine(size.IsEmpty);
Console.WriteLine(size);
True
{Width=0, Height=0}
0
0
{Width=1, Height=0}
False
{Width=5, Height=10}
False
{Width=5, Height=10}
False
{Width=-1, Height=-1}

Operators

The type implements addition and subtraction operators. Addition adds both widths and both heights. Subtraction takes the difference.

using System;
using System.Drawing;

Size a = new Size(5, 5);
Size b = new Size(3, 2);

Size c = a + b;
Size d = a - b;

Console.WriteLine(c);
Console.WriteLine(d);
{Width=8, Height=7}
{Width=2, Height=3}

Convert

SizeF stands for Size Float, and the Size type has several conversion methods available on it. You will need to choose between Ceiling, Truncate, and Round.

using System;
using System.Drawing;

SizeF sizeF = new SizeF(4.5f, 5.6f);
Size ceiling = Size.Ceiling(sizeF);
Size truncate = Size.Truncate(sizeF);
Size round = Size.Round(sizeF);

Console.WriteLine(sizeF);
Console.WriteLine(ceiling);
Console.WriteLine(truncate);
Console.WriteLine(round);
{Width=4.5, Height=5.6}
{Width=5, Height=6}
{Width=4, Height=5}
{Width=4, Height=6}

SizeF

SizeF provides 2 floating point values: width and height. There are several constructors—with no parameters, you get an empty SizeF. You can also specify the width and height as a PointF.

using System;
using System.Drawing;

class Program
{
    static void Main()
    {
        SizeF sizeF = new SizeF();
        Display(sizeF);

        PointF pointF = new PointF(4.5f, 6.5f);
        sizeF = new SizeF(pointF);
        Display(sizeF);

        sizeF = new SizeF(sizeF);
        Display(sizeF);

        sizeF = new SizeF(6.5f, 10.5f);
        Display(sizeF);
    }

    static void Display(SizeF sizeF)
    {
        Console.WriteLine(sizeF);
        Console.WriteLine(sizeF.Width);
        Console.WriteLine(sizeF.Height);
        Console.WriteLine(sizeF.IsEmpty);
    }
}
{Width=0, Height=0}
0
0
True
{Width=4.5, Height=6.5}
4.5
6.5
False
{Width=4.5, Height=6.5}
4.5
6.5
False
{Width=6.5, Height=10.5}
6.5
10.5
False

The Size struct stores a width and a height in int fields. Size has methods that can simplify the logic in programs that handle size information.