如何使用Moles作为构造函数？

Product

public class Product
{
    private float _price;
    public Product()
    {
        _price = 10.0F;
        Debug.WriteLine(\"Initializing price: {0}\", _price);
    }
    public void ModifyPrice(float modifier)
    {
        _price = _price*modifier;
        Debug.WriteLine(\"New price: {0}\", _price);
    }
}

ModifyPrice

[TestMethod]
[HostType(\"Moles\")]
public void Test1()
{
    // Call a constructor that sets the price to 10.
    var fake = new SProduct { CallBase = true };
    var mole = new MProduct(fake)
    {
        ModifyPriceSingle = actual =>
        {
            if (actual != 20.0f)
            {
                MolesContext.ExecuteWithoutMoles(() => fake.ModifyPrice(actual));
            }
            else
            {
                Debug.WriteLine(\"Skipped setting price.\");
            }
        }
    };
    fake.ModifyPrice(20f);
    fake.ModifyPrice(21f);
}

var fake = new SProduct { CallBase = true };

Product

var fake = new Product();

AllInstances

MProduct.Behavior = MoleBehaviors.Fallthrough;
MProduct.AllInstances.ModifyPriceSingle = (p, actual) =>
{
    if (actual != 20.0f)
    {
        MolesContext.ExecuteWithoutMoles(() => p.ModifyPrice(actual));
    }
    else
    {
        Debug.WriteLine(\"Skipped setting price.\");
    }
};

// Call the constructor that sets the price to 10.
Product p1 = new Product();
// Skip setting the price.
p1.ModifyPrice(20f);
// Set the price.
p1.ModifyPrice(21f);

MProduct.Behavior = MoleBehaviors.Fallthrough;