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When would you use delegates in C#? [closed]
...t handlers (for GUI and more)
Starting threads
Callbacks (e.g. for async APIs)
LINQ and similar (List.Find etc)
Anywhere else where I want to effectively apply "template" code with some specialized logic inside (where the delegate provides the specialization)
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INSERT statement conflicted with the FOREIGN KEY constraint - SQL Server
...m_Cat, it has a foreign key reference to another table. The way a FK works is it cannot have a value in that column that is not also in the primary key column of the referenced table.
If you have SQL Server Management Studio, open it up and sp_help 'dbo.Sup_Item_Cat'. See which column that FK is on...
Superscript in CSS only?
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edited May 23 '17 at 11:33
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Using a dispatch_once singleton model in Swift
...stant
class Singleton {
static let sharedInstance = Singleton()
}
This approach supports lazy initialization because Swift lazily initializes class constants (and variables), and is thread safe by the definition of let. This is now officially recommended way to instantiate a singleton.
Class...
ASP.NET MVC Razor pass model to layout
What I see is a string Layout property. But how can I pass a model to layout explicitly?
11 Answers
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Java: Calling a super method which calls an overridden method
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The keyword super doesn't "stick". Every method call is handled individually, so even if you got to SuperClass.method1() by calling super, that doesn't influence any other method call that you might make in the future.
That means there is no direct way to call SuperClass.metho...
How to get distinct values for non-key column fields in Laravel?
This might be quite easy but have no idea how to.
12 Answers
12
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what is reverse() in Django
...sometimes, I see in some templates reverse() . I am not quite sure what this is but it is used together with HttpResponseRedirect. How and when is this reverse() supposed to be used?
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jQuery disable/enable submit button
I have this HTML:
21 Answers
21
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Page redirect after certain time PHP
There is a certain PHP function for redirecting after some time. I saw it somewhere but can't remember. It's like the gmail redirection after logging in. Please, could anyone remind me?
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