大约有 7,000 项符合查询结果（耗时：0.0314秒） [XML]
Is it necessary to explicitly remove event handlers in C#
...ng:
using System;
public class Publisher
{
public event EventHandler Foo;
public void RaiseFoo()
{
Console.WriteLine("Raising Foo");
EventHandler handler = Foo;
if (handler != null)
{
handler(this, EventArgs.Empty);
}
else
...
How does !!~ (not not tilde/bang bang tilde) alter the result of a 'contains/included' Array method
...l sometimes see ~ applied in front of $.inArray.
Basically,
~$.inArray("foo", bar)
is a shorter way to do
$.inArray("foo", bar) !== -1
$.inArray returns the index of the item in the array if the first argument is found, and it returns -1 if its not found. This means that if you're looking fo...
Useless use of cat?
... to pin the UUOC on me for one of my answers. It was a cat file.txt | grep foo | cut ... | cut .... I gave him a piece of my mind, and only after doing so visited the link he gave me referring to the origins of the award and the practice of doing so. Further searching led me to this question. Somewh...
Import module from subfolder
... package you should include the "root" packagename as well, e.g.:
from dirFoo.dirFoo1.foo1 import Foo1
from dirFoo.dirFoo2.foo2 import Foo2
Or you can use relative imports:
from .dirfoo1.foo1 import Foo1
from .dirfoo2.foo2 import Foo2
...
What is the lifetime of a static variable in a C++ function?
...tter() { cout << "Destroyed " << str << endl; }
};
void foo(bool skip_first)
{
if (!skip_first)
static emitter a("in if");
static emitter b("in foo");
}
int main(int argc, char*[])
{
foo(argc != 2);
if (argc == 3)
foo(false);
}
Output:
C:>sam...
(How) can I count the items in an enum?
...good way to do this, usually you see an extra item in the enum, i.e.
enum foobar {foo, bar, baz, quz, FOOBAR_NR_ITEMS};
So then you can do:
int fuz[FOOBAR_NR_ITEMS];
Still not very nice though.
But of course you do realize that just the number of items in an enum is not safe, given e.g.
enum...
jquery selector for id starts with specific text [duplicate]
...;
// Select all elements that have an attribute whose value has the word foobar
$("[attribute~='foobar']");
// Select all elements that have an attribute whose value starts with 'foo' and ends
// with 'bar'
$("[attribute^='foo'][attribute$='bar']");
attribute in the code above can be changed ...
`new function()` with lower case “f” in JavaScript
...on () {
var instance = {},
inner = 'some value';
instance.foo = 'blah';
instance.get_inner = function () {
return inner;
};
instance.set_inner = function (s) {
inner = s;
};
return instance;
})();
The purpose of the new operator is to create ...
What's the correct way to convert bytes to a hex string in Python 3?
...ascii module:
>>> import binascii
>>> binascii.hexlify('foo'.encode('utf8'))
b'666f6f'
>>> binascii.unhexlify(_).decode('utf8')
'foo'
See this answer:
Python 3.1.1 string to hex
share
|...
find: missing argument to -exec
...this example:
$ cat /tmp/echoargs
#!/bin/sh
echo $1 - $2 - $3
$ find /tmp/foo -exec /tmp/echoargs {} \;
/tmp/foo - -
/tmp/foo/one - -
/tmp/foo/two - -
$ find /tmp/foo -exec /tmp/echoargs {} +
/tmp/foo - /tmp/foo/one - /tmp/foo/two
Your command has two errors:
First, you use {};, but the ; must b...