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Android: How to enable/disable option menu item on button click?
...me
Once the activity is created, the
onCreateOptionsMenu() method is called
only once, as described above. The
system keeps and re-uses the Menu you
define in this method until your
activity is destroyed. If you want to
change the Options Menu any time after
it's first created, you...
Why is it important to override GetHashCode when Equals method is overridden?
...not match, they may never be considered equal (Equals will simply never be called).
The GetHashCode() method should reflect the Equals logic; the rules are:
if two things are equal (Equals(...) == true) then they must return the same value for GetHashCode()
if the GetHashCode() is equal, it is no...
PostgreSQL function for last inserted ID
...
( tl;dr : goto option 3: INSERT with RETURNING )
Recall that in postgresql there is no "id" concept for tables, just sequences (which are typically but not necessarily used as default values for surrogate primary keys, with the SERIAL pseudo-type).
If you are interested in ...
What do the plus and minus signs mean in Objective-C next to a method?
...ass methods:-
Are methods which are declared as static. The method can be called without creating an instance of the class. Class methods can only operate on class members and not on instance members as class methods are unaware of instance members. Instance methods of the class can also not be cal...
How to flatten tree via LINQ?
...<T>> f
) => e.SelectMany(c => f(c).Flatten(f)).Concat(e);
Call this function like this:
IEnumerable<MyNode> tree = ....
var res = tree.Flatten(node => node.Elements);
If you would prefer flattening in pre-order rather than in post-order, switch around the sides of the Co...
Is it possible to make the -init method private in Objective-C?
...ou're trying to "ensure" a singleton object is used, don't bother. Specifically, don't bother with the "override +allocWithZone:, -init, -retain, -release" method of creating singletons. It's virtually always unnecessary and is just adding complication for no real significant advantage.
Instead, ...
Display a view from another controller in ASP.NET MVC
...he view, it checks in \Views\Shared.
The shared directory is there specifically to share Views across multiple controllers. Just add your View to the Shared subdirectory and you're good to go.
If you do return View("~/Views/Wherever/SomeDir/MyView.aspx") You can return any View you'd like.
...
AJAX Mailchimp signup form integration
...form action url. Use dataType: 'jsonp' and jsonp: 'c' for Your jQuery ajax call.
– czerasz
Sep 5 '13 at 12:41
...
Postgres: INSERT if does not exist already
... FROM invoices
);
$$
LANGUAGE 'sql';
and just call it:
SELECT fn_upd_invoices('12345', 'TRUE')
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Implementing IDisposable correctly
...ould have any unmanaged resources to be freed you should include Finalizer calling Dispose(false), that will allow GC to call Finalizer when doing garbage collection (in case Dispose was not called yet) and properly free unmanaged resources.
– mariozski
May 17 ...