大约有 47,000 项符合查询结果（耗时：0.0887秒） [XML]
Is it better to return null or empty collection?
...r it's IEnumerable or ICollection doesn't matter that much. Anyway, if you select something of type ICollection they also return null... I would like them to return an empty collection, but I ran into them returning null, so I thought I'd just mention it here. I would say the default of a collection...
In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
... work for a ForeignKey field, a few changes need to be made. Firstly, the SELECT HTML tag does not have the readonly attribute. We need to use disabled="disabled" instead. However, then the browser doesn't send any form data back for that field. So we need to set that field to not be required so...
Hidden Features of C++? [closed]
... It's also useful as a way to switch between implementations, whether selecting say thread-safe versus non-thread-safe, or version 1 versus 2.
– Tony Delroy
Jan 24 '11 at 10:22
...
Avoid browser popup blockers
... Interestingly, popups initiated through a change event bound to a select element will get blocked (in Chrome, not FF), even though that event is initiated by a direct user action, like a click. Although if bound to an input, they're allowed. Strange.
– ccnokes
...
How to implement a custom AlertDialog View
...
This should have been selected as the Best Answer.
– Salman Khakwani
Dec 31 '13 at 9:31
2
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Hidden Features of VB.NET?
... Hines</name>
<%= From p In phoneNumbers2 _
Select <phone type=<%= p.Type %>><%= p.Number %></phone> _
%>
</contact>
share
...
Most common C# bitwise operations on enums
...g)(ulong)flags : Convert.ToInt64(flags)) & (1L << bit)) != 0)
.Select(bit => Enum.ToObject(flags.GetType(), 1L << bit))`
Enums.NET flags.GetFlags()
I'm trying to get these improvements incorporated into .NET Core and maybe eventually the full .NET Framework. You can check o...
SecItemAdd and SecItemCopyMatching returns error code -34018 (errSecMissingEntitlement)
...lCoffman, you must go to your target settings and in Code Signing Identity select "iOS Developer" (or any other valid identity). This fixes the build error, however at least for me it doesn't fix the Keychain problem. I still get -34018 error code.
– Marcin
Jun...
LEN function not including trailing spaces in SQL Server
..."returns the number of bytes used to represent any expression".
Example:
SELECT
ID,
TestField,
LEN(TestField) As LenOfTestField, -- Does not include trailing spaces
DATALENGTH(TestField) As DataLengthOfTestField -- Shows the true length of data, including trailing...
How to delete last character from a string using jQuery?
...end the
// extraction. If omitted,
// slice() selects all
// characters from the begin
// position to the end of
// the string.
var str = '123-4';
alert(str.slice(0, -1));
...