大约有 32,000 项符合查询结果（耗时：0.0405秒） [XML]
Strings as Primary Keys in SQL Database [closed]
...
Technically yes, but if a string makes sense to be the primary key then you should probably use it. This all depends on the size of the table you're making it for and the length of the string that is going to be the primary key (longer strings == harder to compare). I wouldn't necessarily u...
How to store int[] array in application Settings
... on " -> Properties -> Settings.settings", select "Open With..." and then choose either "XML Editor" or "Source Code (Text) Editor".
In the opened xml settings find your setting (it will look like this):
<Setting Name="SomeTestSetting" Type="System.String" Scope="User">
<Value Prof...
FileSystemWatcher Changed event is raised twice
...Watcher component to monitor the creation of new files in a directory, and then test it by using Notepad to create a file, you may see two Created events generated even though only a single file was created. This is because Notepad performs multiple file system actions during the writing process. No...
Global variables in AngularJS
... a problem where i'm initialising a variable on the scope in a controller. Then it gets changed in another controller when a user logs in. This variable is used to control things such as the navigation bar and restricts access to parts of the site depending on the type of user, so its important that...
“static const” vs “#define” vs “enum”
...define var 5
enum { var = 5 };
Ignoring issues about the choice of name, then:
If you need to pass a pointer around, you must use (1).
Since (2) is apparently an option, you don't need to pass pointers around.
Both (1) and (3) have a symbol in the debugger's symbol table - that makes debugging e...
Add Keypair to existing EC2 instance
...with a CD or USB stick, mount the hard drive, check out and fix the files, then reboot the computer to be back in business.
A remote EC2 instance, however, seems distant and inaccessible when you are in one of these situations. Fortunately, AWS provides us with the power and flexibility to be able ...
new keyword in method signature
...
}
public class Derived : Base
{
public new void Method(){}
}
If you then do this:
Base b = new Derived();
b.Method();
The method in the Base is the one that will be called, NOT the one in the derived.
Some more info: http://www.akadia.com/services/dotnet_polymorphism.html
Re your edit: I...
returning in the middle of a using block
...e of a using statement and additionally return the in using variable. But then again, this would also cause you issues even if you didn't return and simply kept a reference to a variable.
using ( var x = new Something() ) {
// not a good idea
return x;
}
Just as bad
Something y;
using ( ...
Java Multiple Inheritance
...nterface Avialae for birds (I'm no biologist, so the terms may be wrong).
Then you can still create a
public class Bird implements Avialae {
}
and
public class Horse implements Equidae {}
and also
public class Pegasus implements Avialae, Equidae {}
Adding from the comments:
In order t...
How can I use external JARs in an Android project?
...oid project and added an external JAR (hessian-4.0.1.jar) to my project. I then added the JAR to the build path and checked it off in Order and Export.
...