CODEWITHSUNDEEP
c#
Shirkan
Shirkan

Reputation: 987

Initializing an array of a certain type using another array (C#)

This is my question: Let's say I have a class with such a constructor:

Class A {
   private int i;
   public A(int new_i) {
      i = new_i;
   }
}

Can I initialize an array of A with an array of int? If so, how can I do it? I was thinking something like:

int[] b = new int[5] { 0,1,2,3,4}; 
A[] a; 
a = new A[](b);

Thanks!

Upvotes: 1

Views: 252

Answers (2)

Marc Gravell
Marc Gravell

Reputation: 1064064

var a = Array.ConvertAll(b, item => new A(item));

The advantage here is that it will be created with the right size, without any intermediate steps - plus it works without LINQ.

In C# 2.0 it is a bit uglier - the following is identical:

A[] a = Array.ConvertAll<int,A>(b,
    delegate(int item) { return new A(item); });

The combination of var, lambdas, and improved generic type inference really shine for C# 3.0 here.

Upvotes: 6

Darin Dimitrov
Darin Dimitrov

Reputation: 1039428

You could use LINQ:

int[] b = new int[5] { 0, 1, 2, 3, 4 }; 
A[] a = b.Select(x => new A(x)).ToArray();

Upvotes: 3

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