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In addition to retrieving static information about a type, it is possible to instantiate a type dynamically. A typical usage of this feature is the creation of plug-in objects. Since pluggable applications allow a user to configure new plug-ins, a class implementing a plug-in is not known at compile time. Therefore, the operator gcnew cannot be used to instantiate the object. Dynamic instantiation is also helpful if you want to write generic code. As an example, an MFC document/view template is used to create instances of a document class and the document s default view class dynamically. To achieve this, you have to use a set of macros

The IMobileObject interface exists to support serialization through the MobileFormatter, which is part of CSLA .NET for Silverlight. CSLA .NET for Silverlight is outside the scope of this book, and IMobileObject has no impact on how CSLA .NET works within the .NET runtime.

Not only is this type Serializable, but it has a custom type converter, specified by the TypeConverter attribute. In fact, SmartDate is a very complex type because it implements operators, type converters, and various other .NET features to act as closely as possible to the DateTime type.

(DECLARE_DYNCREATE and IMPLEMENT_DYNCREATE). .NET gives you this ability for any type without writing any extra lines of code. The static method Activator::CreateInstance(Type^) acts as the late-bound alternative to the operator gcnew. To instantiate a type, given its assembly-qualified type name, the following helper function can be used: Object^ CreateInstanceFromTypename(String^ type) { if (!type) throw gcnew ArgumentNullException("type"); Type^ t = Type::GetType(type); if (!t) throw gcnew ArgumentException("Invalid type name"); Object^ obj = Activator::CreateInstance(t); return obj; } For simplicity, this function expects the passed type to have a default constructor. Many types, including System::Uri, do not have a default constructor. To instantiate a type via a constructor with parameters, an overload for Activator::CreateInstance exists. This overload allows you to pass constructor arguments as an array of System::Object handles. The next line of code shows you how you can use it: Object^ CreateInstanceFromTypename(String^ type, ...array<Object^>^ args) { if (!type) throw gcnew ArgumentNullException("type"); Type^ t = Type::GetType(type); if (!t) throw gcnew ArgumentException("Invalid type name"); Object^ obj = Activator::CreateInstance(t, args); return obj; } In order to instantiate System::Uri with this helper function, you can use the following code: Object^ o = CreateInstanceFromTypename( "System.Uri, System, Version=2.0.0.0, " "Culture=neutral, PublicKeyToken=b77a5c561934e089", "http://www.heege.net" ); If you don t pass the correct argument types, a System::MissingMethodException will be thrown in Activator::CreateInstance.

The ISmartField interface, defined in Csla.Core, is used to allow the rest of the CSLA .NET framework to interact with any smart data types such as this that add string parsing and the concept of being empty to a type. You can implement ISmartField to create your own smart types such as SmartInt or SmartDouble, but be aware that your type will also need to override many operators and provide type converters much like SmartDate in order to act as a first-class type in .NET.

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