Declare a List and populate with values using one code statement [closed]

Question

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Closed 9 years ago.

I have following code

var list = new List<IMyCustomType>();
list.Add(new MyCustomTypeOne());
list.Add(new MyCustomTypeTwo());
list.Add(new MyCustomTypeThree());

this of course works, but I'm wondering: how can I declare the list and populate it with values using one statement?

Thanks

Answer 1

var list = new List<IMyCustomType>{ 
    new MyCustomTypeOne(), 
    new MyCustomTypeTwo(), 
    new MyCustomTypeThree() 
};

Edit: Asker changed "one line" to "one statement", and this looks nicer.

Answer 2

var list = new List<IMyCustomType>
{
   new MyCustomTypeOne(),
   new MyCustomTypeTwo(),
   new MyCustomTypeThree()
};

Not quite sure why you want it in one line?

Answer 3

use the collection initialiser

var list = new List<IMyCustomType>
{
   new MyCustomTypeOne(){Properties should be given here},
   new MyCustomTypeTwo(){Properties should be given here},
   new MyCustomTypeThree(){Properties should be given here},
}

Answer 4

You can use a collection initializor:

var list = new List<IMyCustomType>() { new MyCustomTypeOne(), new MyCustomTypeTwo(), new MyCustomTypeThree() };

Answer 5

var list = new List<IMyCustomType>{ new MyCustomTypeOne(), new  MyCustomTypeTwo() };