How can I declare a sharp list with double values ​​with zero value in C?

Question

The goal is to list and count the number of null values ​​that I have. It will be used to test some Linq code since I don't have a database. The fact is that no matter how I tried to define it, I get from my compiler: “Type or namespace name List1” could not be found. Are you missing the using directive or assembly references? (CS0246)]. "

early.

Answer 1

make sure you have:

using System.Collections.Generic;

then it should be as simple as:

List<double?> mylist = new List<double?>();

Answer 2

mcs? 1.1. " ". gmcs 2.0.

, using System.Collections.Generic; " "

Answer 3

With John Boker answer, you can do something like the following:

List<double?> mylist = new List<double?>();
int nullItemsCount = mylist.Count(item => !item.HasValue);

Answer 4

List<double?> l = new List<double?>();

Works for me ... The (Of T) list, like Nullable (Of T), is in System.Core do you have a link?