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Setting this property to False tells the base BindingList(Of T) class to stop raising the ListChanged event When doing batches of updates or changes to a collection, this can increase performance The BusinessListBase class includes a default implementation of the DataPortal_Update() method, which loops through all child objects (and deleted child objects) to ensure the appropriate Child_XYZ method is called on each when the collection is being saved Normally this is the desired behavior, but you can override DataPortal_Update() if you need to take control of the update process for some unusual scenario As with the editable root stereotype, you can use the ObjectFactory attribute to have the data portal invoke an object factory rather than invoke the DataPortal_XYZ methods directly in the business class Collection objects that inherit from BusinessListBase automatically support data binding in WPF, Windows Forms, and Web Forms.

If you have a string representing the type s name in the language-neutral form, you can use Type::GetType(String^) to retrieve a type information object. As an example, the following expression is true: Type::GetType("System.Int32") == int::typeid

However, if you bind a collection to a Windows Forms DataGrid control, you may be surprised to find that the user can t just add new items by going to the bottom of the grid You need to write a bit of extra code in your collection to enable this behavior In the constructor, you need to give data binding permission to add new items to the collection by setting the AllowNew property Private Sub New() ' Require use of factory methods AllowNew = True End Sub.

<Serializable()> _ Public Class CustomerList Inherits Csla.ReadOnlyListBase(Of CustomerList, CustomerInfo) End Class This indicates that the collection contains child objects of type CustomerInfo. Like NameValueListBase, this class inherits from ReadOnlyBindingList in the Csla.Core namespace. Look at Figure 6-9 to see how the inheritance hierarchy works for this class. Read-only collections are very common in most business applications, and ReadOnlyListBase supports the root and child collection stereotypes discussed in 5.

However, this function is not always as easy to use as it seems, as the following code shows: // GetTypePitfall.cpp // build with "CL /clr:safe GetTypePitfall.cpp" using namespace System; #using <System.dll> int main() { Console::WriteLine(Type::GetType("System.Int32") == int::typeid); // writes True Console::WriteLine(Type::GetType("System.Uri") == Uri::typeid); // writes False! } Type::GetType allows you to pass the namespace-qualified type name only if you want to get a type information object for a type defined in the assembly that called Type::GetType or if the requested type is defined in mscorlib. For all types in other assemblies, the assembly-qualified name must be passed to Type::GetType. As mentioned in the previous chapter, the assembly-qualified name acts as the identifier of a .NET type. It contains the namespace-qualified type name followed by a comma and a space, followed by the name of the assembly that defines the type. Type::AssemblyQualifiedName can be used to return this identifier. The expression Uri::typeid->AssemblyQualifiedName evaluates to System.Uri, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 From this type name, you can conclude that System::Uri is defined in the assembly System (and not in mscorlib). If you pass System::Uri s assembly-qualified type name even though the assembly System has not been loaded, Type::GetType will load the assembly dynamically.

The SingleCriteria(Of B, C) class is a subclass of CriteriaBase and provides an implementation of the most common criteria class, where a business object can be identified by a single criteria value. The SingleCriteria class is defined like this: <Serializable()> _ Public Class SingleCriteria(Of B, C) Inherits CriteriaBase End Class The B type parameter is the type of business object to create, retrieve, or delete. The C type parameter is the type of the criteria value being passed through the data portal. Of course, the interesting part about inheriting from CriteriaBase is that it requires the type of business object to be retrieved, so the constructor in SingleCriteria uses the B type parameter: Public Sub New(ByVal value As C) MyBase.New(GetType(B)) _value = value End Sub The end result is that most business objects can be created, retrieved, or deleted using SingleCriteria by writing code like this: Return DataPortal.Fetch(Of CustomerEdit)( _ New SingleCriteria(Of CustomerEdit, Integer)(id)) If you need more extensive criteria objects, you can create your own subclasses of CriteriaBase, as discussed in 5.

The SmartDate type is a Structure that contains and extends a DateTime value. It is discussed in 2 from a design perspective. The type is declared like this: <Serializable()> _ <System.ComponentModel.TypeConverter( _ GetType(Csla.Core.TypeConverters.SmartDateConverter))> _ Public Structure SmartDate Implements Csla.Core.ISmartField Implements IComparable Implements IConvertible Implements IFormattable Implements Csla.Serialization.Mobile.IMobileObject End Structure

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