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Preserving order with LINQ
I use LINQ to Objects instructions on an ordered array.
Which operations shouldn't I do to be sure the order of the array is not changed?
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Navigation bar show/hide
I have an app with a navigation bar consisting of 2 bar buttons. I would like to hide and show this navigation bar when a user double taps the screen.
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Change private static final field using Java reflection
...ve a class with a private static final field that, unfortunately, I need to change it at run-time.
11 Answers
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Convert a python UTC datetime to a local datetime using only python standard library?
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In Python 3.3+:
from datetime import datetime, timezone
def utc_to_local(utc_dt):
return utc_dt.replace(tzinfo=timezone.utc).astimezone(tz=None)
In Python 2/3:
import calendar
from datetime import datetime, timedelta
def utc_to_local(utc_dt):
# get integer timestamp to avoid p...
Padding is invalid and cannot be removed?
I have looked online for what this exception means in relation to my program but can't seem to find a solution or the reason why it's happening to my specific program. I have been using the example provided my msdn for encrypting and decrypting an XmlDocument using the Rijndael algorithm. The enc...
Convert Data URI to File then append to FormData
I've been trying to re-implement an HTML5 image uploader like the one on the Mozilla Hacks site, but that works with WebKit browsers. Part of the task is to extract an image file from the canvas object and append it to a FormData object for upload.
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How to add google chrome omnibox-search support for your site?
...nter some of URLs in Google Chrome omnibox, I see message in it "Press TAB to search in $URL". For example, there are some russian sites habrahabr.ru or yandex.ru. When you press TAB you'll be able to search in that site, not in your search engine.
How to make my site to be able for it? Maybe, I nee...
Difference between 2 dates in SQLite
...TC on the origin date. That's usually not what you need, unless you happen to live 12 hours west of Greenwich. E.g. if you live in London, this morning is on the same julianday as yesterday afternoon.
– JulianSymes
Aug 24 '13 at 11:57
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Arrow operator (->) usage in C
...pace). I was reading the chapter on pointers and the -> (arrow) operator came up without explanation. I think that it is used to call members and functions (like the equivalent of the . (dot) operator, but for pointers instead of members). But I am not entirely sure.
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Best practices for in-app database migration for Sqlite
...ght change over time. What are the gotchas, naming conventions and things to watch out for to do a successful migration each time?
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