code snippets for "Disposing of the IDisposable implementation" post

s1.cs

public abstract class Disposable : IDisposable
{
    private bool disposed;
 
    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
 
    protected void Dispose(bool disposing)
    {
        if (!disposed)
        {
            if (disposing)
            {
                DisposeManagedResources();
            }
 
            DisposeUnmanagedResources();
            disposed = true;
        }
    }
 
    protected void ThrowExceptionIfDisposed()
    {
        if (disposed)
        {
            throw new ObjectDisposedException(GetType().FullName);
        }
    }
 
    protected abstract void DisposeManagedResources();
    protected virtual void DisposeUnmanagedResources() {}
}

s2.cs

public class MyExpensiveResource : Disposable
{
    private FileStream fileStream;
    private MemoryStream memoryStream;
 
    public MyExpensiveResource(string path)
    {
        fileStream = new FileStream(path, FileMode.Open);
        memoryStream = new MemoryStream();
    }
 
    public void DoSomething()
    {
        ThrowExceptionIfDisposed();
 
        // ... something
    }
 
    protected override void DisposeManagedResources()
    {
        if (fileStream != null) fileStream.Dispose();
        if (memoryStream != null) memoryStream.Dispose();
    }
}