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When to use Cast() and Oftype() in Linq
...ly the elements that can safely be cast to type x.
Cast - will try to cast all the elements into type x. if some of them are not from this type you will get InvalidCastException
EDIT
for example:
object[] objs = new object[] { "12345", 12 };
objs.Cast<string>().ToArray(); //throws InvalidCas...
How to get current time and date in Android
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+1 This was very helpful. Being new it's all these little tidbits we need ... I'm using Calendar to get the Julian date. Much easier than getting milliseconds and figuring out if the value equals today ;)
– Bill Mote
Apr 6 '11...
Selecting empty text input using jQuery
... textboxes using jQuery? I would like to do it using selectors if it is at all possible. Also, I must select on id since in the real code where I want to use this I don't want to select all text inputs.
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Get TFS to ignore my packages folder
...n't. Why? Who knows, the ways of Microsoft are strange and mysterious. Actually, I think it's part of the NuGet stuff I outline below, but if that ever gets fixed in the future and you want to keep the repositories.config file instead of letting VS regenerate it, you should be able to use this:
\pa...
Android App Not Install. An existing package by the same name with a conflicting signature is alread
In my emulator, when I try to do an upgrade of my apk programmatically. I get:
14 Answers
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How do you performance test JavaScript code?
... a good way to get numbers, but in my experience, perceived performance is all that matters to the user/client. For example, we had a project with an Ext accordion that expanded to show some data and then a few nested Ext grids. Everything was actually rendering pretty fast, no single operation too...
Simple explanation of MapReduce?
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Going all the way down to the basics for Map and Reduce.
Map is a function which "transforms" items in some kind of list to another kind of item and put them back in the same kind of list.
suppose I have a list of numbers: [1,2...
How can I see what has changed in a file before committing to git?
...diff works recursively on directories, and if no paths are given, it shows all changes.
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Correct way to use StringBuilder in SQL
... of using StringBuilder, i.e reducing memory. Is it achieved?
No, not at all. That code is not using StringBuilder correctly. (I think you've misquoted it, though; surely there aren't quotes around id2 and table?)
Note that the aim (usually) is to reduce memory churn rather than total memory used...
How to revert uncommitted changes including files and folders?
Is there a git command to revert all uncommitted changes in a working tree and index and to also remove newly created files and folders?
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