Why does Unit.Pixel() only take an integer parameter, but new Unit() has a default return type of Pixel and handles doubles?

Question

Going through my code, I was hoping to remove instances where I do this:

Height = new Unit(doubleValue);

where Height was representing a value in pixels.

I didn't like having to say new everywhere, it felt like I should be able to just modify height's value, but it is read-only.

As such, I stumbled upon Unit.Pixel() and Unit.Percentage(). The percentage method takes a double, but the pixel method only handles integers.

Is there some big reason behind this, an oversight, or a misunderstanding on my part?

Is it standard to create a new unit every time I wish to change height's value?

EDIT: For reference,

Unit Constructor

Pixel Method

what component is that??? Height in a Form or Control is a simple int — Daniel Mošmondor, Jul 13 '11 at 21:50

score 2 · Accepted Answer · edited May 23 '17 at 12:19

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The System.Web.UI.WebControls.Unit is a struct and therefore is immutable. You will need to create a new instance each time you want change the height value.

In web development, sizes are not always measured in pixels, there are many UnitTypes

Unit.Pixel(int n) // Pixels are represented as integer values.

I guess that the Constructor that accepts a double was provided for convenience.

You can do a simple test

var x = new Unit(5.0);
var y = Unit.Pixel(5);

Assert.AreEqual(x, y); // returns true

edited May 23 '17 at 12:19

Community

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answered Jul 13 '11 at 21:57

Rohan West

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But wait, if I have a Height with value 5 and type pixel, it is perfectly fine to say height = Unit.Pixel(10); This changes the value of height, no? – Sean Anderson Jul 13 '11 at 21:59
When I call new Unit(200.5, UnitType.Pixel); I am given an object which says its value is 200.5 pixels. Is this to say that if I use Unit.Pixel(200) I would see no visual differences? (Assuming no code is dependent on the double value and its only necessary for displaying to the screen) – Sean Anderson Jul 13 '11 at 22:05

score 0 · Answer 2 · answered Jan 23 '14 at 12:04

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You can specify pixels in double in the browser, and it really make difference when browser zoom is used.

answered Jan 23 '14 at 12:04

Xizario

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Why does Unit.Pixel() only take an integer parameter, but new Unit() has a default return type of Pixel and handles doubles?

2 Answers2