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copied!<p>You cannot achieve what you want to do without having at least a root class containing your data. Here is a solution which works for a stripped-down version of your problem, namely being able to access field <code>a</code> of your <code>Struct2</code> in your pseudo-array, such as:</p> <pre><code>wrapper wr = new wrapper (); // needs to be a class wr[0].a = 123; wr[1].a = 456; System.Console.WriteLine ("wr[0].a = {0}", wr[0].a); // displays 123 System.Console.WriteLine ("wr[1].a = {0}", wr[1].a); // displays 456 </code></pre> <p>Your wrapper must return a reference type if you want to be able to modify its contents, or else you will always hit your head against the value-type copying taking place when you access structs. But your wrapper may still be storing its data internally as a series of structs.</p> <p>Here is my solution:</p> <pre><code>struct Struct2 { public int a; } class wrapper // sorry, cannot use 'struct' here ... { Struct2 str0; Struct2 str1; public helper this[int index] { get { return new helper (this, index); } } int GetValueA(int index) { switch (index) { case 0: return str0.a; case 1: return str1.a; default: throw new System.IndexOutOfRangeException (); } } void SetValueA(int index, int value) { switch (index) { case 0: str0.a = value; break; case 1: str1.a = value; break; } } public class helper { public helper(wrapper host, int index) { this.host = host; this.index = index; } public int a { get { return this.host.GetValueA (index); } set { this.host.SetValueA (index, value); } } private readonly wrapper host; private readonly int index; } } </code></pre> <p>As your concern seems to be speed, then no wrapper will make you happy. I would reconsider the whole problem and, if at all possible, write a class to manage your data structure.</p> <p>If all your data can be represented as <code>int</code>, maybe you should consider using a huge array of integers and then add classes which access that one central array to locate the fields you want to manipulate, by indexing into the proper item.</p> <pre><code>class Wrapper { ... int[] data; public StructWrapper1 this[int index] { get { return new StructWrapper1 (this, index); } } public class StructWrapper1 { public StructWrapper1(Wrapper wrapper, int index) { this.wrapper = wrapper; this.index = index; } public int A { get { return this.wrapper[this.index*2+0]; } set { this.wrapper[this.index*2+0] = value; } } public int B { get { return this.wrapper[this.index*2+1]; } set { this.wrapper[this.index*2+1] = value; } } private readonly Wrapper wrapper; private readonly int index; } } </code></pre> <p>If you need to represent various data types, you could consider using one array for every field type.</p>

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