大约有 45,000 项符合查询结果（耗时：0.0509秒） [XML]
Create a dictionary on a list with grouping
...
Just to make mquander's suggestion concrete:
var groupedDemoClasses = mySpecialVariableWhichIsAListOfDemoClass
.GroupBy(x => x.GroupKey)
.ToDictionary(gdc => gdc.Key, gdc =>...
LINQ Ring: Any() vs Contains() for Huge Collections
...
Contains() is an instance method, and its performance depends largely on the collection itself. For instance, Contains() on a List is O(n), while Contains() on a HashSet is O(1).
Any() is an extension method, and will simply go through the collection, applyi...
Non-static method requires a target
I have a controller action that works fine on Firefox both locally and in production, and IE locally, but not IE in production. Here is my controller action:
...
Java SafeVarargs annotation, does a standard or best practice exist?
...
1) There are many examples on the Internet and on StackOverflow about the particular issue with generics and varargs. Basically, it's when you have a variable number of arguments of a type-parameter type:
<T> void foo(T... args);
In Java, varargs are a syntac...
how to use XPath with XDocument?
... the solution didn't work out in my case: Weirdness with XDocument, XPath and namespaces
3 Answers
...
How to write a cron that will run a script every day at midnight?
I have heard crontab is a good choice, but how do I write the line and where do I put it on the server?
6 Answers
...
console.log javascript [Function]
...tagged with node.js which indicates that there will not be a window at all and console.log can always be expected. nodejs.org/api/stdio.html
– foiseworth
Apr 23 '14 at 19:42
...
What's the difference between eval, exec, and compile?
I've been looking at dynamic evaluation of Python code, and come across the eval() and compile() functions, and the exec statement.
...
Good examples of Not a Functor/Functor/Applicative/Monad?
...ariant functor out of it, but not a (covariant) functor. Try writing fmap and you'll fail. Note that the contravariant functor version is reversed:
fmap :: Functor f => (a -> b) -> f a -> f b
contramap :: Contravariant f => (a -> b) -> f b -> f a
A type constr...
Copy folder recursively, excluding some folders
...ript that will copy the entire contents of a folder including hidden files and folders into another folder, but I want to exclude certain specific folders. How could I achieve this?
...