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System.Threading.Timer in C# it seems to be not working. It runs very fast every 3 second

I've a timer object. I want it to be run every minute. Specifically, it should run a OnCallBack method and gets inactive while a OnCallBack method is running. Once a OnCallBack method finishes, it (a OnCallBack ) restarts a timer. ...
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How is the undo tree used in Vim?

... See also :h undo-redo, which lists all the commands and their usage. There are two ways to traverse the undo tree. One is to go "back in time". g+ and g- will traverse all of the nodes in the tree in chronological or reverse-chronological order (which can...
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Failed to install Python Cryptography package with PIP and setup.py

When I try to install the Cryptography package for Python through either pip install cryptography or by downloading the package from their site and running python setup.py , I get the following error: ...
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How to get the last N records in mongodb?

...need to sort in ascending order. Assuming you have some id or date field called "x" you would do ... .sort() db.foo.find().sort({x:1}); The 1 will sort ascending (oldest to newest) and -1 will sort descending (newest to oldest.) If you use the auto created _id field it has a date embedded in...
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#ifdef replacement in the Swift language

... After i set the custom flag -DLOCAL, on my #if LOCAl #else #endif, it falls into the #else section. I duplicated the original target AppTarget and rename it to AppTargetLocal & set its custom flag. – Perwyl Liu Jul 20 '16 at 6:48 ...
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AngularJS and its use of Dollar Variables

...="n = { visible: 'foo', $ignore: 'bar' };">{{ n }}</div> Additionally when adding an explicit watcher on a scope object, changes to properties with a leading dollar sign of this object will not trigger the watcher. See this updated fiddle. angular.equals() ignores keys prefixed with $. ...
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Does IMDB provide an API? [closed]

...lo.json (alternate) Format: JSON-P Caveat: It's in JSON-P format, and the callback parameter can not customised. To use it cross-domain you'll have to use the function name they choose (which is in the imdb${searchphrase} format). Alternatively, one could strip or replace the padding via a local pro...
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Download a file from NodeJS Server using Express

...press.static('public')); // <-- This right here }); And then just put all your files inside that 'public' folder, for example: /public/docs/my_word_doc.docx And then a regular old link will allow the user to download it: <a href="public/docs/my_word_doc.docx">My Word Doc</a> ...
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Build Eclipse Java Project from Command Line

...ore.aptBuild It uses the jdt apt plugin to build your workspace automatically. This is also known as a 'Headless Build'. Damn hard to figure out. If you're not using a win32 exe, you can try this: java -cp startup.jar -noSplash -data "D:\Source\MyProject\workspace" -application org.eclipse.jdt....
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What's the difference between deadlock and livelock?

...c final Lock lock2 = new ReentrantLock(true); public static void main(String[] args) { Thread threadA = new Thread(DeadlockSample::doA,"Thread A"); Thread threadB = new Thread(DeadlockSample::doB,"Thread B"); threadA.start(); threadB.start(); } public st...