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How do I create a unique constraint that also allows nulls?
...R TABLE dbo.Party ADD SamAccountNameUnique
AS (Coalesce(SamAccountName, Convert(varchar(11), PartyID)))
ALTER TABLE dbo.Party ADD CONSTRAINT UQ_Party_SamAccountName
UNIQUE (SamAccountNameUnique)
You simply have to put something in the computed column that will be guaranteed unique across the...
What is the use of Enumerable.Zip extension method in Linq?
....
var letters= new string[] { "A", "B", "C", "D", "E" };
var numbers= new int[] { 1, 2, 3 };
var q = letters.Zip(numbers, (l, n) => l + n.ToString());
foreach (var s in q)
Console.WriteLine(s);
Ouput
A1
B2
C3
sha...
Missing return statement in a non-void method compiles
... a non-void method. It has to be a non-void method in order to satisfy the interface. But it seems silly to make this implementation illegal because it does not return anything.
That your method has an unreachable end point because of a goto (remember, a while(true) is just a more pleasant way to ...
Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)
... to manually manage its member resource lifetimes. (Thanks to Mike B for pointing this out.)
For those familliar with C# or VB.NET, you may recognize that RAII is similar to .NET deterministic destruction using IDisposable and 'using' statements. Indeed, the two methods are very similar. The main...
Real mouse position in canvas [duplicate]
...lient window you'll have to subtract the position of the canvas element to convert it relative to the element itself.
Example of integration in your code:
//put this outside the event loop..
var canvas = document.getElementById("imgCanvas");
var context = canvas.getContext("2d");
function draw(ev...
Big O, how do you calculate/approximate it?
...e size.
The purpose is simple: to compare algorithms from a theoretical point of view, without the need to execute the code. The lesser the number of steps, the faster the algorithm.
For example, let's say you have this piece of code:
int sum(int* data, int N) {
int result = 0; ...
When should I use C++14 automatic return type deduction?
...sually implicit but we can make them explicit with casts". C++11 and C++1y introduce type deduction tools so that you can leave out the type in new places.
Sorry, but you're not going to solve this up front by making general rules. You need to look at particular code, and decide for yourself whethe...
How do I define a method in Razor?
...tions is a good place to organize view specific generation code. Case in point: those ugly client templates-from-strings ..
– user2864740
Apr 22 '15 at 22:22
...
Replacing a char at a given index in string? [duplicate]
...ould be something like:
public static string ReplaceAt(this string input, int index, char newChar)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
char[] chars = input.ToCharArray();
chars[index] = newChar;
return new string(chars);
}
This is now...
How can I add remote repositories in Mercurial?
... to mercurial, I would like to use only one tool for my source management. Convert once the repository build the appropriate structures and then only mercurial commands for production. I am kind of aware that both git and mercurial can collaborate but never tried it.
– topless
...