what is the c# equivalent of List and Iterator in Java?

Question

I am manually converting this Java code to C#:

private static final List<BigInteger> PRIMES = Arrays.asList(new BigInteger[]
    { new BigInteger("10007"), new BigInteger("10009"),
      new BigInteger("10037"), new BigInteger("10039")});

Iterator<BigInteger> primes = PRIMES.iterator();

and this is my code in C#:

private static readonly List<BigInteger> PRIMES = new List<BigInteger> {
    10007, 10009,
    10037, 10039 };
IEnumerable<BigInteger> primes = PRIMES.AsEnumerable<BigInteger>();

However, I am not sure if my code is correct. I really do not understand about list and iterator in C#.

Please anyone help me to convert the code correctly, any assistance is greatly appericated.

Many thanks.

Answer 1

Your code is correct. List<T> is the C# equivalent of the java ArrayList<T> , and IEnumerable<T> is more or less the equivalent of the java Iterator<T> . The public API is a bit different, but the end goal is the same.

Note there's no need for the AsEnumerable call though. Since List<T> implements IEnumerable<T> you can just write:

IEnumerable<BigInteger> primes = PRIMES;

That said, calling AsEnumerable isn't really don't anything wrong or costly either.

Answer 2

您的代码看起来不错，但是请注意，可以通过索引访问c＃中的List，因此根据您的操作，可能不需要等效的迭代器。

Answer 3

Java 'List' is an interface, so the .NET equivalent is 'IList', and the .NET equivalent to Java's Iterator is 'IEnumerator', not 'IEnumerable':

private static readonly IList<System.Numerics.BigInteger> PRIMES = new System.Numerics.BigInteger[] { 10007, 10009, 10037, 10039 };

internal IEnumerator<System.Numerics.BigInteger> primes = PRIMES.GetEnumerator();