[ComVisible(true)]
public interface IDisposable
{ // Methods
void Dispose();
}

public class TestClass :IDisposable
{
  public void DoSomething()
  {
    Console.WriteLine("Do some thing....");
  }
  public void Dispose()
  {
    Console.WriteLine("及时释放资源");
  }
}

using (TestClass testClass = new TestClass())
{
  testClass.DoSomething();
}

TestClass testClass = new TestClass();
try {
  testClass.DoSomething();
}
finally
{
  IDisposable disposable = testClass as IDisposable;
  if (disposable != null)
  disposable.Dispose();
}

protected override void Finalize()
{
  Console.WritleLine("析构函数执行...");
}

protected override void Finalize()
{
  try {
    Console.WritleLine("析构函数执行...");
  }
  finally {
    base.Finalize();
  }
}

public class TestClass: IDisposable
{
  ~TestClass()
  {
    Dispose();
  }
  public void Dispose()
  { // 清理资源
  }
}

private bool _isDisposed = false;
public void Dispose()
{
  Dispose(true);
  GC.SupressFinalize(this);
}
protected void Dispose(bool Diposing)
{
  if(!_isDisposed)
  {
    if(Disposing)
    {
      //清理托管资源
    }
    //清理非托管资源
  }
  _isDisposed=true;
}
~TestClass()
{
  Dispose(false);
}

public class BaseResource : IDisposable
{
  // 非托管资源
  private IntPtr _handle;
  //托管资源
  private Component _components;
  // Dispose是否被调用
  private bool _disposed = false;
  public BaseResource() { }
  public void Dispose()
  {
    Dispose(true);
    GC.SuppressFinalize(this);
  }
  protected virtual void Dispose(bool disposing)
  {
    if (!this._disposed)
    {
      if (disposing)
      {
        // 释放托管资源
        _components.Dispose();
      }
      // 释放非托管资源，如果disposing为false, 只有非托管资源被释放
      CloseHandle(_handle);
      _handle = IntPtr.Zero;
      // 注意这里不是线程安全的
    }
    _disposed = true;
  }
  // 析构函数只会在我们没有直接调用Dispose方法的时候调用
  // 派生类中不用在次提供析构函数
  ~BaseResource() { Dispose(false); }
  // 如果你已经调用了Dispose方法后再调用其他方法会抛出ObjectDisposedException
  public void DoSomething()
  {
    if (this._disposed)
    {
      throw new ObjectDisposedException();
    }
  }
}
public class MyResourceWrapper : BaseResource
{
  // 托管资源
  private ManagedResource _addedManaged;
  // 非托管资源
  private NativeResource _addedNative;
  private bool _disposed = false;
  public MyResourceWrapper() { }
  protected override void Dispose(bool disposing)
  {
    if (!this._disposed)
    {
      try
      {
        if (disposing)
        {
          _addedManaged.Dispose();
        }
        CloseHandle(_addedNative);
        this._disposed = true;
      }
      finally
      {
        base.Dispose(disposing);
      }
    }
  }
}