使用NUnit在派生类中设置？

如果我有以下代码:

[TestFixture]
public class MyBaseTest
{
    protected ISessionManager _sessionManager;

    [SetUp]
    public void SetUp() { /* some code that initializes _sessionManager */ }
}

[TestFixture]
public class MyDerivedTest : MyBaseTest
{
    IBlogRepository _repository;

    [SetUp]
    public void SetUp() { /* some code that initializes _repository */ }

    [Test]
    public void BlogRepository_TestGoesHere() { /* some tests */ }
}

[TestFixture]
public class MyDerivedTest : MyBaseTest
{
    IBlogRepository _repository;

    [SetUp]
    public new void SetUp()
    {
        base.SetUp();
        /* some code that initializes _repository */
    }

public void MyBaseTest
{
    abstract void SetUp();

    [SetUp]
    public void BaseSetUp()
    {
        /* base initialization */
        SetUp(); // virtual call
    }
}

   [SetUp]
   public void DerivedSetUp()
   {
      base.BaseSetUp();
      // Do something else
   }