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Is HttpClient safe to use concurrently?
In all the examples I can find of usages of HttpClient , it is used for one off calls. But what if I have a persistent client situation, where several requests can be made concurrently? Basically, is it safe to call client.PostAsync on 2 threads at once against the same instance of HttpClient .
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XPath OR operator for different nodes
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All title nodes with zipcode or book node as parent:
Version 1:
//title[parent::zipcode|parent::book]
Version 2:
//bookstore/book/title|//bookstore/city/zipcode/title
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Replace words in a string - Ruby
...eplaced word isn't in the sentence (the []= variant will).
How to replace all instances?
The above replaces only the first instance of "Robert".
To replace all instances use gsub/gsub! (ie. "global substitution"):
sentence.gsub! 'Robert', 'Joe'
The above will replace all instances of Robert w...
Understanding Canvas and Surface concepts
...nders these to the final display in their correct Z-order. A surface typically has more than one buffer (usually two) to do double-buffered rendering: the application can be drawing its next UI state while the surface flinger is compositing the screen using the last buffer, without needing to wait ...
What does |= (single pipe equal) and &=(single ampersand equal) mean
...icit cast, and the target variable is only evaluated once, but that's basically the gist of it.
In terms of the non-compound operators, & is a bitwise "AND" and | is a bitwise "OR".
EDIT: In this case you want Folder.Attributes &= ~FileAttributes.System. To understand why:
~FileAttribute...
Why do we use $rootScope.$broadcast in AngularJS?
... scope of that app can catch it using a simple: $scope.$on().
It is especially useful to send events when you want to reach a scope that is not a direct parent (A branch of a parent for example)
!!! One thing to not do however is to use $rootScope.$on from a controller. $rootScope is the applicati...
What are the big differences between TFVC (TFS Version Control) and Git for source control when usin
...for source control when using VS 2013?
MSDN has a very extensive page on all the features and differences between Team Foundation Version Control and Git.
Is the only benefit in my case a local repository (not saying that's insignificant) and IoS development support?
No, there's lot more, bu...
How to avoid circular imports in Python? [duplicate]
....py
Types of circular import problems
Circular import dependencies typically fall into two categories depending
on what you're trying to import and where you're using it inside each
module. (And whether you're using python 2 or 3).
1. Errors importing modules with circular imports
In some cases...
Git remote branch deleted, but still it appears in 'branch -a'
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git remote prune origin, as suggested in the other answer, will remove all such stale branches. That's probably what you'd want in most cases, but if you want to just remove that particular remote-tracking branch, you should do:
git branch -d -r origin/coolbranch
(The -r is easy to forget...)...
What is __pycache__?
...'s files, respectively.
As a programmer, you can largely just ignore it... All it does is make your program start a little faster. When your scripts change, they will be recompiled, and if you delete the files or the whole folder and run your program again, they will reappear (unless you specificall...