memorycache-unpredictable

MemoryCache – Acceptably unpredictable

If you’re not familiar with System.Runtime.Caching.MemoryCache, chances are that the following code does three things you wouldn’t expect…

Take a look at the call to AddOrGetExisting. Here’s the method signature if it helps..

Doesn’t look too suspicious, does it? If you’ve never seen MemoryCache.AddOrGetExisting, you might have made the following incorrect assumptions:

  1. The first time you call AddOrGetExisting, it should add the value, stringToCache in my example, to the cache and return that same value. In other words you might think that yeResult, in my example, would be “tada!!!”, right? Wrong. It’s null the first time you call it.

    Per the documentation:

    Return Value
    Type: System.Object
    If a cache entry with the same key exists, the existing cache entry; otherwise, null.

    Odd at first, but it’s not hard to get around. I’ll try to post another article soon explaining why this happens.

  2. You might think that the parameters we passed to AddOrGetExisting would cause the cache to expire in 10 seconds, right? Wrong. It’s 20 seconds. At least. Per this valuable answer, the internal TimeSpan that periodically checks the cache is configured for 20 seconds. So you can’t expect to set the timeout for anything less than 20 seconds by default.
  3. And I say “at least” above because, in my experience, even if you set the expiration date 20 seconds from now, it might expire in 20 seconds… or it might be 22.. or 27.. or 30… or who knows! It’s unpredictable. I imagine it’s because MemoryCache is doing fancy things behind the scenes. Maybe one day I’ll look into it further.

For my purposes, MemoryCache.AddOrGetExisting works perfectly fine! I just wish someone had told me these things before I started using it.

Nasty shortcut makes setting this ridiculously easy.

Don’t accidentally allow unsafe code

This seems so dangerous. I can’t believe Microsoft has let it slip through QC for the past couple Visual Studio releases.

As a keyboard junkie, I expect ALT+F,C to close the currently open file. Or if I want to save the current file, ALT+F,S should do the trick. That’s not the case if you’re on the Build tab of a project’s properties screen (Figure 1). Here, ALT+F is going to Allow unsafe code!!!

Figure 1

It’s not too hard to catch on that something isn’t right when you use an ALT+F combination on this screen because, typically, the desired action won’t occur. It still throws me off every time it happens, but I’m keen enough to go back and make sure I uncheck uncheck that nasty little checkbox.

Growl for Windows + Visual Studio 2013

This is the second time I’ve wanted to get Grows for Windows working with Visual Studio 2013.

The Visual Studio plugin hasn’t been updated since since 2010, so it takes just a little bit of effort to get it working

The key, every time I do this, is to find this old post.

You may have noticed hat post talks about fixing the plugin to work in Visual Studio 2012. Of course, making it work in 2013 is about as simple as you can imagine.

  1. Install the current Growl For Visual Studio plug in
  2. Open up %APPDATA%\Microsoft\MSEnvShared\Addins\GrowlExtras.VisualStudioAddIn.AddIn in notepad
  3. In the <Extensibility> node, add the following
    <HostApplication>
      <Name>Microsoft Visual Studio Macros</Name>
      <Version>12.0</Version>
    </HostApplication>
    <HostApplication>
      <Name>Microsoft Visual Studio</Name>
      <Version>12.0</Version>
    </HostApplication>
  4. Save and close the file
  5. Might have to close and restart Visual Studio for it to actually register with Growl.

Time saver – Audible page load notifications

We devs… We write code, save, flip over to the browser, press F5 to refresh the page… and wait. And wait. And probably wait some more.

That’s no way to live. Some sites can take quite a while for the page to load, typically due to background processes that need to get warmed up before the site beings to act smoothly.

Personally, I want to be doing other things while I wait for that page to load. But I don’t want to forget that I was ever waiting for the page to load. I want an audible notification that the page was ready for me to work with. And I want it to be a generic tool I can tweak to work with any website/page I’m working on, without having to modify the actual website.

And so I installed Tampermonkey in Chrome. I guess it’s like Greasemonkey, but I’ve never used that either. :)

Turns out, I was able to get exactly what I want relatively easy.

I don’t even understand how that beep() function works, but it does. Smile The important thing is the @match line at the top that instructs Tampermonkey to run the beep function when that page is finished loading.

Now I can press CTRL+F5 in VisualStudio and switch over to responding to emails until I hear the beep that lets me know the webpage has finished loading.

nugetninja

Advanced nuget command line ninjary

Small post here, but I just wanted to post something. It’s been too long. Smile

I had a need yesterday to reinstall a group of nuget packages and didn’t want to go through 8 pages of packages in VisualStudio, hand picking the ones I wanted to reinstall. Nor did I want to type update-package <package name> –reinstall for every single page, mostly because I couldn’t easily remember the names of all the packages that needed reinstalling.

Also, update-package doesn’t have a way to specify a wildcard, so you can’t do something like update-package *DefinitelyTyped*.

But then I remember that there’s power in PowerShell.  Behold…

get-package | where Id -like “*DefinitelyTyped*” | foreach { update-package $_.Id  -reinstall }

Pretty rad. I had never heard of get-package before I wrote that line. So then I though, can I install every DefinitelyTyped package at once?

And just for fun, what if I wanted to install every DefinitelyTyped package related to Bootstrap?

get-package -ListAvailable | where {($_.Id -like “*DefinitelyTyped*”)-and ($_.Id -like “*bootstrap*”) } | foreach { install-package $_.Id }

Done.

What other clever ways have you combined PowerShell and nuget?

Finding duplicate code in C#, VB.Net, ASPX, Ruby, Python, Java, C, C++, ActionScript, or XAML

Whether you realize it or not, you need a tool that finds duplicate source code in your applications. In fact, if you’ve never used one before, you probably don’t realize how much you need an automated solution to this problem. It’s nearly impossible to manually locate the types of duplicate code that such a tool can easily bring to the surface. Even if you think you’re intimately aware of an application’s code base, every line of code you write contains the potential to awaken the duplicate code dragon.

To combat the problem, we have Atomiq – what I consider to be the best solution for finding duplicate/similar code in C#, VB.Net, ASPX, Ruby, Python, Java, C, C++, ActionScript, and XAML.

Continue reading «Finding duplicate code in C#, VB.Net, ASPX, Ruby, Python, Java, C, C++, ActionScript, or XAML»

Using delegates to eliminate duplicate code

Here’s a simple technique you can use to easily eliminate duplicate code. Try not to let the word “delegates” scare you away from learning the technique and I’ll try to refrain from using the word “delegate” as much as possible.  I’ll start small and then work my way towards a more complex example that really demonstrates its power. Continue reading «Using delegates to eliminate duplicate code»

Using IDisposable objects responsibly – the easy way

How many times have you complained about how much repetitive code is required to properly dispose of objects in your code? How many times have you found yourself in a situation where you’re unsure whether or not you’re even supposed to dispose of an object in the first place?

I want to show you a technique which completely (or, at least, temporarily) avoids the need to bother yourself with those very important concerns. This is an extremely powerful technique which can be used for much more than dealing with IDisposable related issues, but that seems to be the scenario I use it on most often. Continue reading «Using IDisposable objects responsibly – the easy way»

The current state of AlexDresko.com

I’m being forced to hold off a bit on writing anything really meaningful due to all of the other things involved with starting a new website like this. For example:

  • I’m not very happy with the registration process that is required for commenting on my posts. I think I want to leave registration as a requirement, but the process of commenting on a post needs to be streamlined.
  • I haven’t yet found an OpenId plug-in for WordPress that functions the way I want. OpenId is enabled on the site, but only nerds like myself would have any clue how to use it. What I really want is something like this:
    image
  • The major search engines still don’t see my new site the way they should. If you search for “Alex Dresko”, I want AlexDresko.com to be the first result. At least Bing shows my site first when you search for “AlexDresko.com”.  I predict this is going to take a while, but there are still a lot of things I can do to make my site the most attractive result when people search for me.
  • For crying out loud, I don’t even have an “About Me” page yet! What about my resume and links to my social network profiles?  I bet you don’t even know what my purpose is for this site. And have you seen that default faveicon in the address bar? Gag me with a spoon! Yes, I just wrote that. The list of small stuff like this grows and shrinks daily and I’m going to keep hammering away at it until there’s nothing left to sweat.

So that’s a rough break down of what’s happening here right now.

I. Am. Not. Going. To. Give. Up. On. This.