一步创建ArrayList

Question

I'm desperately trying to create an ArrayList out of objects of an enumeration in one step in C# with Visual Studio 2012 . It should look like something of the following:

new ArrayList( {class1.enum.sample1, class1.enum.sample2, class1.enum.sample3} );

When I'm writing it in two lines, it works:

class1.enum[] array = {class1.enum.sample1, class1.enum.sample2, class1.enum.sample3};
ArrayList test = new ArrayList(ha);

But I need to write it in one line. Could you help me, please?

Answer 1

You need another collection like an array to be able to use the collection initializer :

var al = new ArrayList { new[] { class1.enum.sample1, class1.enum.sample2, class1.enum.sample3 } };

But there is no reason to use the old ArrayList anymore. In this case you could use a List<class1.enum> (apart from the fact that enum is a keyword).

Answer 2

You do not need parenthesis () for array list initializer. You can initialize in a single line as under.

ArrayList test = new ArrayList{class1.enum.sample1, class1.enum.sample2, class1.enum.sample3} 

Array list should be replace with generic list unless you have solid reason to use Arraylist. You can find more about using generic list in Benefits of Generics on MSDN