using System;

public class Program

{

    public static void Main()

    {

        var example = new Example();

        example.GetStruct(0).IntValue = 5;

        Console.WriteLine(example.GetStruct(0).IntValue);

    }

}

​

public class Example

{

    private object[] _objects = new object[]

    {

        new MyStruct { IntValue = 3 }

    };

    public ref MyStruct GetStruct(int index)

    {

        return ref (MyStruct)_objects[index];

    }

}

​

public struct MyStruct

{

    public int IntValue;

}