c# - this List<string> ListName as a parameter? -

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what mean when have list parameter method?

public static void killzombies(this list<zombie> zombiestokill, int numberofbullets) {     ... }

that mean method extension method:

the code calling method might little confusing:

var zombies = new list<zombie>(); zombies.killzombies(15);

in reality, kind of syntactic sugar equivalent to:

public static void killzombies(list<zombie> zombiestokill,                                int numberofbullets) {     // code here }

with calling code looking like:

var zombies = new list<zombie>(); killzombies(zombies, 15);

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