大约有 44,000 项符合查询结果（耗时：0.0515秒） [XML]
Using IQueryable with Linq
...ing data from a table in two ways, one which returns IEnumerable<T>, and one which returns an IQueryable<T>. Say, for example, you have a Products table, and you want to get all of the products whose cost is >$25.
If you do:
IEnumerable<Product> products = myORM.GetProducts(...
Difference between List, List, List, List, and List
...the differences between List, List<?>, List<T>, List<E>, and List<Object>?
10 Answers
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How can I remove specific rules from iptables?
I am hosting special HTTP and HTTPS services on the ports 8006 and 8007 respectively. I use iptables to "activate" the server; i.e. to route the incoming HTTP and HTTPS ports:
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How to search a specific value in all tables (PostgreSQL)?
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+1 free and simple. And if you want structure pg_dump can do that too. Also if grep isn't your thing use what ever file content searching tool you want on the dumped out structures and/or data.
– Kuberchaun
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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...
How to find largest objects in a SQL Server database?
...est objects in a SQL Server database? First, by determining which tables (and related indices) are the largest and then determining which rows in a particular table are largest (we're storing binary data in BLOBs)?
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What is the purpose of std::make_pair vs the constructor of std::pair?
...hink you can do one = {10, 20} nowadays but I don't have a C++11 compiler handy to check it.
– MSalters
Feb 14 '12 at 8:11
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Get most recent file in a directory on Linux
Looking for a command that will return the single most recent file in a directory.
21 Answers
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Deep null checking, is there a better way?
...ing a new operation "?." to the language that has the semantics you want. (And it has been added now; see below.) That is, you'd say
cake?.frosting?.berries?.loader
and the compiler would generate all the short-circuiting checks for you.
It didn't make the bar for C# 4. Perhaps for a hypothetic...
Fastest way to check if a string matches a regexp in ruby?
... avoids object allocations performed by other methods such as Regexp#match and =~:
Regexp#match?
Added Regexp#match?, which executes a regexp match without creating a back reference object and changing $~ to reduce object allocation.
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