C # declare a list and populate with values ​​with a single line of code

Question

I have the following list

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

this works, but I wonder how can I declare a list and populate the values ​​with a single statement?

thanks

Answer 1

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

Edit: Asker changed “one line” to “one statement”, and it looks better.

Answer 2

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

Not quite sure why you want it on one line?

Answer 3

use collection initializer

 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 the initializor collection :

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

Answer 5

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