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The data source control itself; the UI developer uses this directly Provides the actual implementation of data binding for CslaDataSource Provides a configuration UI form displayed in Visual Studio to configure the control The Visual Studio designer for CslaDataSource Provides schema information and sample data for the designer The schema object for a business object, responsible for returning an instance of ObjectViewSchema Provides actual information about a business object specifically, information about all the business object s bindable properties Maintains information about a specific field in the object schema

Figure 10-7 provides a helpful diagram that illustrates how these classes relate to each other. The UI developer drags a CslaDataSource control onto a Web Form and interacts with it. While in Visual Studio, CslaDataSourceDesigner coordinates all that interaction, although in reality, all the hard work is done by CslaDesignerDataSourceView. The CslaDataSourceDesigner control may open the CslaDataSourceConfiguration dialog box to allow the user to configure some aspects of the control. When a control such as GridView is bound to CslaDataSource, it requests schema information about the data source. This schema information is created and returned by the ObjectSchema, ObjectViewSchema, and ObjectFieldInfo objects. Finally, at runtime, the web form interacts with CslaDataSource to perform the actual data binding. All the hard work is actually handled by CslaDataSourceView, an instance of which is managed by the CslaDataSource control.

Before I continue with the discussion of the step-by-step migration, take a look at Table 7-3, which summarizes all the differences between the managed compilation models that I have discussed here. Table 7-3. Comparing the Compilation Models

Figure 10-7. Relationship between the classes in CslaDataSource The only bit of functionality that a UI developer will see is that CslaDataSource declares and raises four events. The UI developer must respond to these events to provide the interaction with the business object. Table 10-8 lists the events.

Requests that the UI provide a reference to the business object that is the data source Requests that the UI insert a new business object based on the data from the form Requests that the UI update a business object with the data from the form, based on the key value provided Requests that the UI delete the business object based on the key value provided

Can C++ source code be compiled to managed code Can source code use native types Can generated object files be linked with native object files to produce a mixed-code assembly Can managed code in the resulting assembly be verifiably type safe (Required if assembly should execute with restricted .NET permissions) Can the resulting assembly be loaded from a network share Yes Yes Yes

These four events are directly analogous to the four method names required by the ASP.NET ObjectDataSource. Rather than using reflection to invoke a set of methods, I opted to raise events, because this is an easier programming model in my opinion. With the ObjectDataSource, the UI developer must implement four methods (or defer to those in an ADO.NET TableAdapter), while with CslaDataSource, the developer simply handles these four events. There is a custom EventArgs class for each of the events: SelectObjectArgs, InsertObjectArgs, UpdateObjectArgs, and DeleteObjectArgs, respectively. Each one provides properties that are used within the event handler. The end result is a fully functional data source control that understands CSLA .NET style business objects. UI developers can use this control to leverage the data binding support of ASP.NET Web Forms when working with rich business objects.

Only if the default security settings are adapted Only if the default security settings are adapted Only if all linker inputs are compiled with /clr:safe

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