public static class Ext
	{
		public static IEnumerable<U> Map<T, U>(this IEnumerable<T> s, Func<T, U> f)
		{
			foreach (var item in s)
				yield return f(item);
		}
		
		public static IEnumerable<int> Seq(this int @from, int @to)
		{
			while(@from <= @to)
				yield return @from++;
		}		
		
	}	
	
public struct MyStruct
	{
		public int val;
		public MyStruct(int val){this.val = val;}
	}
	
void Main()
{
	var myMass = 1.Seq(100).Map(i => new MyStruct(i)).ToArray();
}

Enumerable.Range(0, 100).Select(v => new MyStruct(v)).ToArray();