大约有 16,000 项符合查询结果（耗时：0.0197秒） [XML]
How do you perform a CROSS JOIN with LINQ to SQL?
...s:
var names = new string[] { "Ana", "Raz", "John" };
var numbers = new int[] { 1, 2, 3 };
var newList=names.SelectMany(
x => numbers,
(y, z) => { return y + z + " test "; });
foreach (var item in newList)
{
Console.WriteLine(item);
}
...
Difference between Key, Primary Key, Unique Key and Index in MySQL
...uplicate values result in an error.
A PRIMARY KEY is both a unique constraint and it also implies that the column is NOT NULL. It is used to give an identity to each row. This can be useful for joining with another table via a foreign key constraint. While it is not required for a table to have a P...
What is the use of ObservableCollection in .net?
...works essentially like a regular collection except that it implements
the interfaces:
INotifyCollectionChanged,
INotifyPropertyChanged
As such it is very useful when you want to know when the collection has changed. An event is triggered that will tell the user what entries have been added/re...
How can I remove a specific item from an array?
... Serious question: why doesn't JavaScript allow the simple and intuitive method of removing an element at an index? A simple, elegant, myArray.remove(index); seems to be the best solution and is implemented in many other languages (a lot of them older than JavaScript.)
...
Unnecessary curly braces in C++?
...automatic) variables.
In C++ this is maybe not so important since you can introduce new variables anywhere, but perhaps the habit is from C, where you could not do this until C99. :)
Since C++ has destructors, it can also be handy to have resources (files, mutexes, whatever) automatically released...
JavaScript check if variable exists (is defined/initialized)
...zed is better/correct?
(Assuming the variable could hold anything (string, int, object, function, etc.))
28 Answers
...
Pagination on a list using ng-repeat
...
Like Bart, I needed to pass paging info into a calling function to get pagable data - it is similar but different and might help in some cases. plnkr.co/edit/RcSso3verGtXwToilJ5a
– Steve Black
May 23 '14 at 15:49
...
Can't connect to localhost on SQL Server Express 2012 / 2016
...NNING THIS!
USE [master]
GO
DECLARE @SqlServerAndWindowsAuthenticationMode INT = 2;
EXEC xp_instance_regwrite
N'HKEY_LOCAL_MACHINE',
N'Software\Microsoft\MSSQLServer\MSSQLServer',
N'LoginMode',
REG_DWORD,
@SqlServerAndWindowsAuthenticationMode;
GO
If you're connecting using "Integrated Se...
How to get folder path for ClickOnce application
...
@Jalal for "old crappy machines" go www.SysInternals.com and download Process Explorer. I suspect changes in TaskManager of Win7 and then Win8 were just copied from it.
– Arioch 'The
Mar 21 '13 at 19:16
...
Get domain name from given url
...g RFC 3986, you will probably get it wrong. Just use the one that's built into the core libraries.
If you really need to deal with messy inputs that java.net.URI rejects, see RFC 3986 Appendix B:
Appendix B. Parsing a URI Reference with a Regular Expression
As the "first-match-wins" algo...