BindingList<T> and reflection?

If I have a business object, Order, where Order contains OrderDetails, where OrderDetails is a BindingList<OrderDetail>. How can I create this using relfection?

I have an object builder that dynamically creates the SQL statements and gets a list of order details. Now I need to place those order details in the BindingList<OrderDetail> details member of my object?

Code:

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/// obj - Container object which holds the BindingList<T> object.
/// property - The PropertyInfo object for the BindingList<T> object.
/// targetType - The type of object that the data reader has and the BindingList<T> should contain.
/// rdr - The date reader with the records?
void LoadObjects(ObjectBase obj, PropertyInfo property, Type targetType, IDataReader rdr)
{
    //// I need to create the binding list???????
    BindingList<????targetType????> list = Activator.CreateInstance(????);

    while(rdr.Read())
    {
          ObjectBase newObj = Activator.CreateInstance(targetType);
          FillObject(newObj, rdr);

        list.Add(newObj);
    }
    property.SetValue(obj, list, null);
}

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Any help at all with this?

Mike B

try making LoadObjects generic and pass your generic type parameter in as a type parameter to the method instead of as a method parameter.

failing that, you'll have to do it all by reflection instead of creating a known type and calling methods directly on it.

To create an instance of generic type at runtime, you need Type's MakeGenericType() method.

In your case:

Code:

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Type type = typeof(BindingList<>).MakeGenericType(targetType);

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Quote:

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Originally Posted by boudino

To create an instance of generic type at runtime, you need Type's MakeGenericType() method.

In your case:

Code:

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Type type = typeof(BindingList<>).MakeGenericType(targetType);

---

---

Thanks, that works!

[Edit]
Ok, it works, but how to I assign it to a property of the "parent" object class. The IBindingList needs an explicit cast. Any ideas?


Mike Bujak

Quote:

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Originally Posted by MadHatter

try making LoadObjects generic and pass your generic type parameter in as a type parameter to the method instead of as a method parameter.

failing that, you'll have to do it all by reflection instead of creating a known type and calling methods directly on it.

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Thanks for the reply. What you said works, but I am afraid it doesn't allow me to do all I need to do. There are times when I am loading an object, I may also need to "Eagerly" load some of its child objects and collections, at this point, the type of object is unknown and cannot be passed as a parameter.

Mike B

Quote:

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Originally Posted by MikeB

Thanks, that works!

[Edit]
Ok, it works, but how to I assign it to a property of the "parent" object class. The IBindingList needs an explicit cast. Any ideas?


Mike Bujak

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Should I just declare the members as IBindingList instead of explicit types?