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<Serializable()> _ Public Class EditableChild Inherits BusinessBase(Of EditableChild) #Region "Business Methods" ' TODO: add your own fields, properties, and methods ' example with private backing field Private Shared IdProperty As PropertyInfo(Of Integer) = _ RegisterProperty(New PropertyInfo(Of Integer)("Id"))Integer)("Id")) Private _Id As Integer = IdProperty.DefaultValue Public Property Id() As Integer Get Return GetProperty(IdProperty, _Id) End Get Set(ByVal value As Integer) SetProperty(IdProperty, _Id, value) End Set End Property ' example with managed backing field Private Shared NameProperty As PropertyInfo(Of String) = _ RegisterProperty(New PropertyInfo(Of String)("Name")) Public Property Name() As String Get Return GetProperty(NameProperty) End Get Set(ByVal value As String) SetProperty(NameProperty, value) End Set End Property #End Region #Region "Validation Rules" Protected Overrides Sub AddBusinessRules() ' TODO: add validation rules 'ValidationRules.AddRule(RuleMethod, NameProperty) End Sub #End Region #Region "Authorization Rules" Protected Overrides Sub AddAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowWrite(NameProperty, "Role") End Sub Private Shared Sub AddObjectAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowEdit(GetType(EditableChild), "Role") End Sub #End Region #Region "Factory Methods" Friend Shared Function NewEditableChild() As EditableChild Return DataPortal.CreateChild(Of EditableChild)() End Function Friend Shared Function GetEditableChild( _ ByVal childData As Object) As EditableChild Return DataPortal.FetchChild(Of EditableChild)(childData) End Function

The class defines a field to store a reference to the real data reader that it is encapsulating. That field is exposed as a protected property as well, allowing for subclasses of SafeDataReader in the future. There s also a constructor that accepts the IDataReader object to be encapsulated as a parameter. This means that ADO.NET code in a business object s DataPortal_Fetch() method might appear as follows: SafeDataReader dr = new SafeDataReader(cm.ExecuteReader()); The ExecuteReader() method returns an object that implements IDataReader (such as SqlDataReader) that is used to initialize the SafeDataReader object. The rest of the code in DataPortal_Fetch() can use the SafeDataReader object just like a regular data reader object, because it implements IDataReader. The benefit, though, is that the business object s data access code never has to worry about getting a null value from the database. The implementation of IDataReader is a lengthy business it contains a lot of methods so I m not going to go through all of it here. Instead I ll cover a few methods to illustrate how the overall class is implemented.

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cell.text = [NSString stringWithFormat:@"%@ - %@", highScore.full_name, highScore.score]; return cell; }

cm.CommandType = CommandType.StoredProcedure; cm.Parameters.Add( "@PageName", SqlDbType.VarChar, 400).Value = Request.Url.AbsoluteUri; cm.Parameters.Add( "@SessionID", SqlDbType.VarChar, 50).Value = vsk.Value; cm.Parameters.Add( "@StateData", SqlDbType.Image).Value = ms.ToArray(); cn.Open(); cm.ExecuteNonQuery(); cn.Close(); } protected override object LoadPageStateFromPersistenceMedium() { if (Request.Params["__VIEWSTATE_KEY"] == null) return null; string viewstatekey = Request.Params["__VIEWSTATE_KEY"].ToString(); SqlConnection cn = new SqlConnection(connStr); SqlCommand cm = new SqlCommand("usp_LoadState", cn); SqlDataReader dr = null; cm.CommandType = CommandType.StoredProcedure; cm.Parameters.Add( "@PageName", SqlDbType.VarChar, 400).Value = Request.Url.AbsoluteUri; cm.Parameters.Add( "@SessionID", SqlDbType.VarChar, 50).Value = viewstatekey; try { cn.Open(); dr = cm.ExecuteReader();

Thus far, I could have been quite confident that nothing bad would happen when I called the unmanaged function sscanf from the managed code, so I simply called it. But who knows what terrible dangers lurk in the deep shadows of unmanaged code I don t. So I d better take steps to make sure the application behaves in an orderly manner. For this purpose, I can employ the mechanism of exception handling, which is well known to C++ and Visual C# .NET programmers. Examine the light modifications of the sample (source file Simple2.il) shown in Listing 2-2. As before, I ve marked the modifications with the CHANGE! comment. Listing 2-2. Simple2.il, Modified Again //----------- Program header .assembly extern mscorlib { auto } .assembly OddOrEven { } .module OddOrEven.exe //----------- Class Declaration .namespace Odd.or { .class public auto ansi Even extends [mscorlib]System.Object { //------------ Field declaration .field public static int32 val //------------ Method declaration .method public static void check( ) cil managed { .entrypoint .locals init (int32 Retval) AskForNumber: ldstr "Enter a number" call void [mscorlib]System.Console::WriteLine(string) .try { // CHANGE! // Guarded block begins call string [mscorlib]System.Console::ReadLine() // pop // CHANGE! // ldnull // CHANGE! ldstr "%d" ldsflda int32 Odd.or.Even::val call vararg int32 sscanf(string,string,...,int32*) stloc.0 leave.s DidntBlowUp // CHANGE! // Guarded block ends } // CHANGE!

The detailed design issues around building an ASP.NET data source control are outside the scope of this book. Nonetheless, I ll walk quickly through the code in these classes to call out the highlights of the implementation. It turns out that implementing runtime functionality is relatively straightforward, but providing design time functionality is more complex. Table 10-7 lists the classes required to implement the CslaDataSource control s runtime and design time support.

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