大约有 23,000 项符合查询结果（耗时：0.0481秒） [XML]
How Should I Declare Foreign Key Relationships Using Code First Entity Framework (4.1) in MVC3?
...Key("CustomerID")]
public virtual Customer Customer { get; set; }
EDIT based on Latest Code
You get that error because of this line:
[ForeignKey("Parent")]
public Patient Patient { get; set; }
EF will look for a property called Parent to use it as the Foreign Key enforcer. You can do 2 things...
Should functions return null or an empty object?
...serExist(id) would be appropriate if you do choose to throw an exception.
Based on extensive comments below: if this is an API-level design question, this method could be analogous to "OpenFile" or "ReadEntireFile". We are "opening" a user from some repository and hydrating the object from the resu...
How to declare array of zeros in python (or an array of a certain size) [duplicate]
...ay('I', [0] * count) slow? I'd assume it will first create a full list and based on that full list then create the array, which sounds... terrible. I would guess that laziness would actually be quite beneficial in your last code snippet and make it run faster?
– devoured elysiu...
What is a serialVersionUID and why should I use it?
...ion runtime will calculate a default serialVersionUID value for that class based on various aspects of the class, as described in the Java(TM) Object Serialization Specification. However, it is strongly recommended that all serializable classes explicitly declare serialVersionUID values, since the d...
How can I show dots (“…”) in a span with hidden overflow?
...
NOTE: This seems to only work based on height and not width, really quite a bad solution
– Anthony
Aug 22 at 19:59
...
What is the right way to override a setter method in Ruby on Rails?
...is also suggesting to use super like this:
class Model < ActiveRecord::Base
def attribute_name=(value)
# custom actions
###
super(value)
end
end
===========================================================================
Original Answer
If you want to override the setter me...
How to initialize a JavaScript Date to a particular time zone
...e any differently, they typically implement the standard IANA timezone database and provide functions for using it in JavaScript. Modern libraries use the time zone data supplied by the Intl API, but older libraries typically have overhead, especially if you are running in a web browser, as the dat...
What is the difference between \r and \n?
...
"\r" => Return
"\n" => Newline or Linefeed
(semantics)
Unix based systems use just a "\n" to end a line of text.
Dos uses "\r\n" to end a line of text.
Some other machines used just a "\r". (Commodore, Apple II, Mac OS prior to OS X, etc..)
...
LLVM vs clang on OS X
...presentation suitable for LLVM.
llvm gcc was an initial version of a llvm based C++ compiler based on gcc 4.2, which is now deprecated since CLang can parse everything it could parse, and more.
Finally, the main difference between CLang and gcc does not lie in the produced code but in the approach...
How to implement the factory method pattern in C++ correctly
...t;
void registerType(QString name)
{
static_assert(std::is_base_of<T, TDerived>::value, "Factory::registerType doesn't accept this type because doesn't derive from base class");
_createFuncs[name] = &createFunc<TDerived>;
}
T* create(QString name) {
...