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I'm looking for a performant way to add distinct items of a second ICollection to an existing one. I'm using .NET 4.
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In the real sense it has no meaning or full form. It was developed by Dennis Ritchie and Ken Thompson at AT&T bell Lab. First, they used to call it as B language then later they made some improvement into it and renamed it as C and its superscript as C++ which was invented by Dr.
What is C? C is a general-purpose programming language created by Dennis Ritchie at the Bell Laboratories in 1972. It is a very popular language, despite being old. C is strongly associated with UNIX, as it was developed to write the UNIX operating system.
C is a general-purpose language that most programmers learn before moving on to more complex languages. From Unix and Windows to Tic Tac Toe and Photoshop, several of the most commonly used applications today have been built on C. It is easy to learn because: A simple syntax with only 32 keywords.
This should do it:
list1.Union(list2).Distinct(aCustomComparer).ToList()
As long as they're IEnumerable, you can use the go-to Linq answer:
var union = firstCollection.Union(secondCollection);
This will use the default equality comparison, which for most objects is referential equality. To change this, you can define an IEqualityComparer generic to the item type in your collection that will perform a more semantic comparison, and specify it as the second argument of the Union.
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