using System;

​

public class Program

{

    public static void Main()

    {

        new Test().TestDisposableStruct();

    }

}

​

public class Test {

    readonly public DisposableStruct member;

    public void TestDisposableStruct() {

        // This will create a defensive copy. member.hasMutated is false;

        member.Mutate();

        Console.WriteLine("readonly field has mutated: " + member.hasMutated);

        using (var disposable = new DisposableStruct())

        {

            // While we can't do "disposable.aField = true;",

            // We can do this and mutate the struct:

            disposable.Mutate();

            Console.WriteLine("'using' variable has mutated: " + disposable.hasMutated);

        }

    }

}

​

public struct DisposableStruct : IDisposable

{

    public bool hasMutated;

    public void Mutate() 

    {

        hasMutated = true;

    }

    void IDisposable.Dispose() 

    {

        Console.WriteLine("Has mutated in Dispose: " + hasMutated);

    }

}