大约有 6,261 项符合查询结果（耗时：0.0227秒） [XML]
C# string reference type?
...parameter is a reference type:
MyClass c = new MyClass(); c.MyProperty = "foo";
CNull(c); // only a copy of the reference is sent
Console.WriteLine(c.MyProperty); // still foo, we only made the copy null
CPropertyChange(c);
Console.WriteLine(c.MyProperty); // bar
private void CNull(MyClass c2)...
Quick Way to Implement Dictionary in C
...wered Dec 8 '10 at 5:25
abc def foo barabc def foo bar
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What's the state of the art in email validation for Rails?
...valid email addresses. Not many, but a few. For instance, technically #|@foo.com is a valid email address, as is "Hey I can have spaces if they're quoted"@foo.com. I find it easiest to just ignore anything before the @ and validate just the domain part.
– Nerdmaster
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How to find the length of a string in R
...
See ?nchar. For example:
> nchar("foo")
[1] 3
> set.seed(10)
> strn <- paste(sample(LETTERS, 10), collapse = "")
> strn
[1] "NHKPBEFTLY"
> nchar(strn)
[1] 10
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...
Export a graph to .eps file with R
...alues. Read ?postscript for the details.
Here is an example:
postscript("foo.eps", horizontal = FALSE, onefile = FALSE, paper = "special")
plot(1:10)
dev.off()
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How can I determine the type of an HTML element in JavaScript?
...bute you are looking for. For example:
var elt = document.getElementById('foo');
console.log(elt.nodeName);
Note that nodeName returns the element name capitalized and without the angle brackets, which means that if you want to check if an element is an <div> element you could do it as foll...
Rails: How to list database tables/objects using the Rails console?
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ActiveRecord::Base.connection.columns("foos") should also work, but it returns column objects, .map{|c| [c.name, c.type] } on the end fixes that.
– cwninja
Jan 20 '10 at 10:15
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What's the safest way to iterate through the keys of a Perl hash?
...iece of
code), it will continue at this position.
Example:
my %hash = ( foo => 1, bar => 2, baz => 3, quux => 4 );
# find key 'baz'
while ( my ($k, $v) = each %hash ) {
print "found key $k\n";
last if $k eq 'baz'; # found it!
}
# later ...
print "the hash contains:\n";
# i...
How to change color in markdown cells ipython/jupyter notebook?
...
You can simply use raw html tags like
foo <font color='red'>bar</font> foo
Be aware that this will not survive a conversion of the notebook to latex.
As there are some complaints about the deprecation of the proposed solution. They are totally vali...
Difference between ref and out parameters in .NET [duplicate]
...d but passing it as a ref parameter it has to be set to something.
int x;
Foo(out x); // OK
int y;
Foo(ref y); // Error: y should be initialized before calling the method
Ref parameters are for data that might be modified, out parameters are for data that's an additional output for the function ...