在IOrderedEnumerable上枚举时设置属性<>不会在集合中的对象上设置属性

我正在VS2008/.net3.5sp1中编写和运行。

void Main()
{
    IOrderedEnumerable<MyClass> objects = Enumerable.Range(0, 10)
            .Select(n => new MyClass(n))
            .OrderBy(o => o.ObjectNumber);

    foreach (MyClass obj in objects)
    {
        obj.MyProperty = true;
    }

    var trueObjs = objects.Where(o => o.MyProperty);

    if (trueObjs.Count() == 0)
    {
        Debug.WriteLine("No object in 'objects' has MyProperty == true");
    }
    else
    {
        Debug.WriteLine("Found");
    }
}

public class MyClass
{
    public MyClass(int objectNumber)
    {
        ObjectNumber = objectNumber;
        MyProperty = false;
    }

    public int ObjectNumber { get; private set; }
    public bool MyProperty { get; set; }
}