大约有 22,000 项符合查询结果（耗时：0.0318秒） [XML]
Query an XDocument for elements by name at any depth
...
using System.Xml.Linq;
class Test
{
static void Main()
{
string xml = @"
<root>
<child id='1'/>
<child id='2'>
<grandchild id='3' />
<grandchild id='4' />
</child>
</root>";
XDocument doc = XDocument.Parse(xml);
...
Read-only list or unmodifiable list in .NET 4.0
...oking for ReadOnlyCollection, which has been around since .NET2.
IList<string> foo = ...;
// ...
ReadOnlyCollection<string> bar = new ReadOnlyCollection<string>(foo);
or
List<string> foo = ...;
// ...
ReadOnlyCollection<string> bar = foo.AsReadOnly();
This creates...
Why do we usually use || over |? What is the difference?
...nd Peter mentioned, for short-circuiting is the null reference check:
if(string != null && string.isEmpty())
{
//we check for string being null before calling isEmpty()
}
more info
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What are the differences between Abstract Factory and Factory design patterns?
...ase.
interface IMessageQueueFactory
{
IMessageQueue CreateOutboundQueue(string name);
IMessageQueue CreateReplyQueue(string name);
}
public class AzureServiceBusQueueFactory : IMessageQueueFactory
{
IMessageQueue CreateOutboundQueue(string name)
{
//init queue
...
How to iterate over rows in a DataFrame in Pandas
...ed to a lot of waiting.
Do you want to print a DataFrame? Use DataFrame.to_string().
Do you want to compute something? In that case, search for methods in this order (list modified from here):
Vectorization
Cython routines
List Comprehensions (vanilla for loop)
DataFrame.apply(): i) Reductions th...
How to match “anything up until this sequence of characters” in a regular expression?
...n: /^[^abc]/ . This will match any single character at the beginning of a string, except a, b, or c.
12 Answers
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Send an Array with an HTTP Get
.... There is no definitive standard for this. See also a.o. Wikipedia: Query string:
While there is no definitive standard, most web frameworks allow multiple values to be associated with a single field (e.g. field1=value1&field1=value2&field2=value3).[4][5]
Generally, when the target se...
Lambda Expression and generic method
...
Using method reference, i found other way to pass the argument:
List<String> list = Arrays.asList("a", "b", "c");
sort(list, Comparable::<String>compareTo);
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improve t...
Python regular expressions return true/false
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re.match(...) would return true if the string's beginning part match the regular pattern. While search will confirm the pattern anywhere in the string.
– Yu Shen
Jun 8 '13 at 9:57
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Version vs build in Xcode
... Info tab for your Application Target, you should use the "Bundle versions string, short" as your Version (e.g., 3.4.0) and "Bundle version" as your Build (e.g., 500 or 1A500). If you don't see them both, you can add them. Those will map to the proper Version and Build textboxes on the Summary tab; ...