问为什么这个if语句没有命中？

EN

[TestClass]
public class UnitTest1
{
    [TestMethod]
    public void TestMethod1()
    {
        const int length = 10;
        var j = 0;
        List<Dictionary<string, object>> theList = new List<Dictionary<string, object>>();

        for (int i = length - 1; i >= 0; i--)
        {
            var theDictionary = new Dictionary<string, object>();
            theDictionary.Add("string-" + i + "-" + j++, new object());
            theDictionary.Add("string-" + i + "-" + j++, new object());
            theDictionary.Add("string-" + i + "-" + j++, new object());
            theDictionary.Add("string-" + i + "-" + j++, new object());
            theList.Add(theDictionary);
        }

        var theTested = new CodeToTest(theList);

        var returnedValue = theTested.TestThis();

        Assert.AreEqual(returnedValue,length);
    }
}

class CodeToTest
{
    private List<Dictionary<string, object>> listOfDictionaries;

    public CodeToTest(List<Dictionary<string, object>> listOfDictionaries)
    {
        this.listOfDictionaries = listOfDictionaries;
    }

    public int TestThis()
    {
        var i = 0;
        foreach (Dictionary<string, object> dictionary in listOfDictionaries)
        {
            i++;
            if (object.Equals(dictionary, listOfDictionaries.Last()))
            {
                Console.WriteLine("Got here: " + i);
                return i;
            }
        }
        return 0;
    }
}