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LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria
Consider the IEnumerable extension methods SingleOrDefault() and FirstOrDefault()
15 Answers
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Clang vs GCC for my Linux Development project
...e gap is closing.
Original:
For students, I would unconditionally recommend Clang.
The performance in terms of generated code between gcc and Clang is now unclear (though I think that gcc 4.7 still has the lead, I haven't seen conclusive benchmarks yet), but for students to learn it does not re...
Why is using the JavaScript eval function a bad idea?
...ity to compile/cache eval'd code)
Edit: As @Jeff Walden points out in comments, #3 is less true today than it was in 2008. However, while some caching of compiled scripts may happen this will only be limited to scripts that are eval'd repeated with no modification. A more likely scenario is that y...
jquery input select all on focus
... of focus. It seems to work for both mouse and key events (at least on Chrome/Mac):
jQuery < version 1.7:
$("input[type='text']").click(function () {
$(this).select();
});
jQuery version 1.7+:
$("input[type='text']").on("click", function () {
$(this).select();
});
Here is a demo
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Do Facebook Oauth 2.0 Access Tokens Expire?
... application to perform authorized requests on behalf of the user at any time. By default, most access tokens expire after a short time period to ensure applications only make requests on behalf of the user when the are actively using the application. This permission makes the access token returned ...
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
...:XE
(Note: between 1521 and XE should be a /)
This bad jdbc string give me a ORA-12505 error too.
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Detecting Unsaved Changes
I have a requirement to implement an "Unsaved Changes" prompt in an ASP .Net application. If a user modifies controls on a web form, and attempts to navigate away before saving, a prompt should appear warning them that they have unsaved changes, and give them the option to cancel and stay on the cu...
Practical uses for the “internal” keyword in C#
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Utility or helper classes/methods that you would like to access from many other classes within the same assembly, but that you want to ensure code in other assemblies can't access.
From MSDN (via archive.org):
A common use of internal access is i...
int a[] = {1,2,}; Weird comma allowed. Any particular reason?
Maybe I am not from this planet, but it would seem to me that the following should be a syntax error:
20 Answers
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How to get pixel data from a UIImage (Cocoa Touch) or CGImage (Core Graphics)?
...ow of the image or the entire image size!) I don't the performance of this method will be good since having too many UIColor objects is really heavy. In real life when I need a pixel then UIColor is ok, (An NSArray of UIColors is too much for me). And when you need bunch of colors I won't use UIColo...