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What is the use of ObservableCollection in .net?
...
class FooObservableCollection : ObservableCollection<Foo>
{
protected override void InsertItem(int index, Foo item)
{
base.Add(index, Foo);
if (this.CollectionChanged != null)
this.Collect...
Difference between new and override
...r behaves by default as new keyword is used.
class A
{
public string Foo()
{
return "A";
}
public virtual string Test()
{
return "base test";
}
}
class B: A
{
public new string Foo()
{
return "B";
}
}
class C: B
{
public string ...
Passing variables through handlebars partial
...ens are replace in order.
USAGE: {{$ 'path.to.partial' context=newContext foo='bar' }}
USAGE: {{$ 'path.:1.:2' replaceOne replaceTwo foo='bar' }}
///////////////////////////////*/
Handlebars.registerHelper('$', function(partial) {
var values, opts, done, value, context;
if (!partial) {
...
What does mysql error 1025 (HY000): Error on rename of './foo' (errorno: 150) mean?
I tried this in mysql:
14 Answers
14
...
What does “=>” mean in PHP?
...Note that this can be used for numerically indexed arrays too.
Example:
$foo = array('car', 'truck', 'van', 'bike', 'rickshaw');
foreach ($foo as $i => $type) {
echo "{$i}: {$type}\n";
}
// prints:
// 0: car
// 1: truck
// 2: van
// 3: bike
// 4: rickshaw
...
Why check both isset() and !empty()
...
This is completely redundant. empty is more or less shorthand for !isset($foo) || !$foo, and !empty is analogous to isset($foo) && $foo. I.e. empty does the reverse thing of isset plus an additional check for the truthiness of a value.
Or in other words, empty is the same as !$foo, but d...
Casting to string in JavaScript
...ut you can cast undefined to a string using the other two methods:
var foo;
var myString1 = String(foo); // "undefined" as a string
var myString2 = foo + ''; // "undefined" as a string
var myString3 = foo.toString(); // throws an exception
http://jsfiddle.net/f8YwA/
...
What does {0} mean when initializing an object?
...at this technique will not set padding bytes to zero. For example:
struct foo
{
char c;
int i;
};
foo a = {0};
Is not the same as:
foo a;
memset(&a,0,sizeof(a));
In the first case, pad bytes between c and i are uninitialized. Why would you care? Well, if you're saving this data t...
How do I test a private function or a class that has private methods, fields or inner classes?
...essible member, is via @Jailbreak from the Manifold framework.
@Jailbreak Foo foo = new Foo();
// Direct, *type-safe* access to *all* foo's members
foo.privateMethod(x, y, z);
foo.privateField = value;
This way your code remains type-safe and readable. No design compromises, no overexposing ...
Java Class.cast() vs. cast operator
... special to the compiler. It could be optimized when used statically (i.e. Foo.class.cast(o) rather than cls.cast(o)) but I've never seen anybody using it - which makes the effort of building this optimization into the compiler somewhat worthless.
...