Silverlight Tip of the Day #77 - Creating an Efficient Random Generator

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Silverlight Tips of the Day - Summary Outline

Silverlight Tips of the Day - Blog by Mike Snow — Fri, 02 Jan 2009 22:57:21 GMT

The purpose of this post is to create an outline summary all the blogs from my Silverlight tips of the

Dew Drop - December 2, 2008 | Alvin Ashcraft's Morning Dew

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Silverlight Cream for December 01, 2008 -- #443

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In this issue: Alex Golesh, Silverlight SDK, John Stockton, Page Brooks(2), Mike Snow(2), Terence Tsang

re: Silverlight Tip of the Day #77 - Creating an Efficient Random Generator

jackbond — Tue, 02 Dec 2008 00:56:10 GMT

The differences are minor, but one of the primary ones is maintainability. First off, this functionality has nothing to do with the Application class itself, so why put it there and then require a cast? Or in the future, if he needed to refactor this code, and decided to put it in a library, he would need to update all the existing references. Better just to separate it out in the beginning (especially if it's going to encapsulate thread safetey as well.)

Somewhat related, and not nearly emphasized enough:

en.wikipedia.org/.../Law_of_Demeter

re: Silverlight Tip of the Day #77 - Creating an Efficient Random Generator

miguelito928 — Tue, 02 Dec 2008 00:16:47 GMT

Mike,

I expanded on your blog post with a few thoughts of my own on this subject. See my blog post as a tribute to yours:

murrayon.net/.../correctly-using-random-number.html

re: Silverlight Tip of the Day #77 - Creating an Efficient Random Generator

mike.snow — Mon, 01 Dec 2008 22:42:23 GMT

The main difference is that the class is static.

re: Silverlight Tip of the Day #77 - Creating an Efficient Random Generator

GearWorld — Mon, 01 Dec 2008 22:32:54 GMT

Waaaaa I don't get it. I look at both code and I don't see any difference else then the name of the method and the name of the class

Can you guys shed some light on it please ?

re: Silverlight Tip of the Day #77 - Creating an Efficient Random Generator

mike.snow — Mon, 01 Dec 2008 22:11:47 GMT

Good points! I will update the post to use a static method as you showed.

re: Silverlight Tip of the Day #77 - Creating an Efficient Random Generator

Odegaard — Mon, 01 Dec 2008 22:08:03 GMT

I couldn't agree more with JackBond. The pattern used above is horrible.

Just to add to the above example. I would use lazy instantiation, as well as making sure it's thread safe (see en.csharp-online.net/Singleton_design_pattern:_Thread-safe_Singleton)

re: Silverlight Tip of the Day #77 - Creating an Efficient Random Generator

jackbond — Mon, 01 Dec 2008 21:52:57 GMT

You could avoid tying your code to a particular application class (and thereby the unneccessary casting) by simply using a static method on a utility class to achieve the same result (sample below) One other issue, the silverlight docs make no mention of whether Next() is thread safe or not. If not, it would be pretty easy to lock on the _Random object (another reason to put this functionality in a separate class)

public class GlobalRandom

{

static Random _Random;

static GlobalRandom()

{

_Random = new Random();

}

public static int Next(int min, int max)

{

return _Random.Next(min, max);

}

Silverlight Tip of the Day #77 - Creating an Efficient Random Generator

Microsoft Weblogs — Mon, 01 Dec 2008 20:58:32 GMT

In some of my older posts I was creating a separate random generator for each object. However, the documentation