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Covariance and contravariance real world example
... contravariantFish = contravariantAnimal;
}//method
}//class
// .NET Framework Examples:
public interface IList<T> : ICollection<T>, IEnumerable<T>, IEnumerable { }
public interface IEnumerable<out T> : IEnumerable { }
class Delegates {
// When T is used as b...
asynchronous vs non-blocking
...(as supported by Windows sockets), or the asynchronous IO pattern used in .NET, are more convenient. You call a method to start an operation, and the framework calls you back when it's done. Even here, there are basic differences. Asynchronous Win32 sockets "marshal" their results onto a specific GU...
Set focus on TextBox in WPF from view model
...overflow :).
The best way to track down issues with Focus is... debugging .Net source code. No kidding. It saved me a lot of time many times. To enable .net source code debugging refer to Shawn Bruke's blog.
Finally, general approach that I use to set focus from ViewModel is Attached Properties. I w...
Foreign Key to non-primary key
...
How to do this in asp net MVC 5
– irfandar
Oct 4 '17 at 10:31
Can...
Differences between ExpandoObject, DynamicObject and dynamic
...oObject is a FULL implementation of IDynamicMetaObjectProvider, where the .NET Framework team has made all of these decisions for you. This is useful if you don't need any custom behavior, and you feel that ExpandoObject works good enough for you (90% of the time, ExpandoObject is good enough). So f...
What's the difference between a continuation and a callback?
...e is a call/cc implementation in JavaScript done by Matt Might (matt.might.net/articles/by-example-continuation-passing-style - go to the very last paragraph), but please don't ask me how it works nor how to use it :-)
– Marco Faustinelli
Dec 30 '15 at 16:28
...
What is difference between Collection.stream().forEach() and Collection.forEach()?
...
See hg.openjdk.java.net/jdk8/jdk8/jdk/file/jdk8-b132/src/share/… for example.
– Stuart Marks
Aug 25 '15 at 15:10
...
Convert JavaScript string in dot notation into an object reference
...y style notation, as well as empty strings - see my example here: jsfiddle.net/sc0ttyd/q7zyd
– Sc0ttyD
Jan 18 '13 at 13:17
2
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Effects of changing Django's SECRET_KEY
...ous session had been invalidated.
With Powershell (source):
# Load the .net System.Web namespace which has the GeneratePassword function
[Reflection.Assembly]::LoadWithPartialName("System.Web")
# GeneratePassword(int length, int numberOfNonAlphanumericCharacters)
[System.Web.Security.Membership...
How to use WeakReference in Java and Android development?
...p is not a cache!
Tom is right that there have been complaints about poor Netbeans performance due to WeakHashMap caching.
I still think it would be a good learning experience to implement a cache with WeakHashMap and then compare it against your own hand-rolled cache implemented with SoftRefere...