大约有 44,000 项符合查询结果（耗时：0.0370秒） [XML]
Is DateTime.Now the best way to measure a function's performance?
...rformance counter doesn't exist) Stopwatch is using DateTime.UtcNow + some extra processing. Because of that it's obvious that in that case DateTime.UtcNow is the best option (because other use it + some processing)
However, as it turns out, the counter almost always exists - see Explanation about ...
Elegant way to combine multiple collections of elements?
...2.Where(x => true),
list3.OrderBy(x => x)
);
Looks better. The extra, otherwise redundant, class name I have to write is not a problem for me considering my sequences look cleaner with the Concat call. It's less of a problem in C# 6. You can just write:
return Concat(list1.Select(x = &g...
How do I 'svn add' all unversioned files to SVN?
... awk? Awk can do pattern matching: awk '/^[?]/{print $2}'; No need for the extra grep process.
– bdrx
Feb 26 '15 at 13:59
1
...
Changing password with Oracle SQL Developer
... Thank you, it worked on Windows 7 64bit. I did have to go through an extra step though (which is the same as the first step on OS X config above), otherwise the 'reset password' option would remain grayed out. 4. Set path to Instant Client in Preferences -> Database -> Advanced -> Us...
Android View shadow
... Awesome. Just an FYI for future viewers, this is in /<sdk-path>/extras/android/support.
– theblang
Aug 20 '14 at 20:26
2
...
Why should you remove unnecessary C# using directives?
...
Leaving extra using directives is fine. There is a little value in removing them, but not much. For example, it makes my IntelliSense completion lists shorter, and therefore easier to navigate.
The compiled assemblies are not affe...
Add a default value to a column through a migration
..., since change_column is irreversible.
Instead, though it may be a couple extra lines, you should use def up and def down
So if you have a column with no default value, then you should do this to add a default value.
def up
change_column :users, :admin, :boolean, default: false
end
def down
...
How can I add a column that doesn't allow nulls in a Postgresql database?
...
Or, create a new table as temp with the extra column, copy the data to this new table while manipulating it as necessary to fill the non-nullable new column, and then swap the table via a two-step name change.
Yes, it is more complicated, but you may need to do it...
How to set up a PostgreSQL database in Django
...org/psycopg/, then install it under Python PATH
After downloading, easily extract the tarball and:
$ python setup.py install
Or if you wish, install it by either easy_install or pip.
(I prefer to use pip over easy_install for no reason.)
$ easy_install psycopg2
$ pip install psycopg2
Config...
How to make a smaller RatingBar?
...
you can remove some extra padding by specifying height of rating bar ex : android:layout_height="40dp"
– Manohar Reddy
Aug 28 '17 at 13:43
...