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Note Quick quiz: What s the difference between the mean, the median, and the mode (without looking it up on
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An interface is more than just a list of members for a class or struct to implement. It is a reference type. You cannot access an interface directly through the class object s members. You can, however, get a reference to the interface by casting the class object reference to the type of the interface. Once you have a reference to the interface, you can use dot-syntax notation with the reference to call interface members. For example, the following code shows an example of getting an interface reference from a class object reference. In the first statement, variable mc is a reference to a class object that implements interface IIfc1. The statement casts that reference to a reference to the interface and assigns it to variable ifc. The second statement uses the reference to the interface to call the implementation method. Interface Cast to interface IIfc1 ifc = (IIfc1) mc; Interface ref Class object ref
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Finally, to use Web Services, the configuration would look like this: < xml version="1.0" encoding="utf-8" > <configuration> <appSettings> <add key="CslaAuthentication" value="Csla" /> <add key="CslaDataPortalProxy" value="Csla.DataPortalClient.WebServicesProxy, Csla"/> <add key="CslaDataPortalUrl" value="http://localhost/WebServicesHost/WebServicePortal.asmx"/> </appSettings> <connectionStrings> </connectionStrings> As with remoting, you need to change localhost and WebServicesHost to the actual server name and virtual root name used by your application. Also, the virtual root and web service asmx file must be created and configured. I ll show how this is done in 12. The most important thing to realize about the site configuration is that the data portal can be changed from local to remote (using any of the network channels) with no need to change any UI or business object code.
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<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" /> <CommandRowStyle BackColor="#D1DDF1" Font-Bold="True" /> <RowStyle BackColor="#EFF3FB" /> <FieldHeaderStyle BackColor="#DEE8F5" Font-Bold="True" /> <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" /> <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" /> <EditRowStyle BackColor=CornflowerBlue /> <AlternatingRowStyle BackColor="White" /> </asp:DetailsView> The single most important part of this declaration for this discussion is the DataSourceID property, which points the control at odsBookDetail. This causes the ObjectDataSource control to feed these control instances of BookDetails as they re selected from the ListBox. The BoundField declarations of this control then name public properties of that business object. Figure 11-4 displays the output generated.
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The typeof operator is also called by the GetType method, which is available for every object of every type. For example, the following code retrieves the name of the type of the object: class SomeClass { ... } class Program { static void Main() { SomeClass s = new SomeClass(); Console.WriteLine("Type s: {0}" , s.GetType().Name); } } This code produces the following output: Type s: SomeClass
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The BusinessBase class implements three Overridable methods that are used to determine whether the current user is allowed to read, write, or execute individual properties and methods. The ReadOnlyBase class implements only CanReadProperty() because it is designed to support read-only objects. These methods are Overridable so a business developer can override and extend their behavior. By default, these methods simply check the list of allowed and denied roles associated with each property or method. To enhance performance, the result of a role check is cached and is rechecked only if the current principal object changes. This is particularly valuable in a WPF or Windows Forms application, where the principal will change only if the user logs in or out of the application (when using custom authentication). It has less value in web applications because the server is typically stateless, so the business object (and thus its cache) is destroyed at the end of each page or service request. For example, here s the CanReadProperty() method from BusinessBase: <EditorBrowsable(EditorBrowsableState.Advanced)> _ Public Overridable Function CanReadProperty( _ ByVal propertyName As String) As Boolean Dim result As Boolean = True VerifyAuthorizationCache() If Not _readResultCache.TryGetValue(propertyName, result) Then result = True If AuthorizationRules.HasReadAllowedRoles(propertyName) Then ' some users are explicitly granted read access ' in which case all other users are denied If Not AuthorizationRules.IsReadAllowed(propertyName) Then result = False End If ElseIf AuthorizationRules.HasReadDeniedRoles(propertyName) Then ' some users are explicitly denied read access If AuthorizationRules.IsReadDenied(propertyName) Then result = False End If End If ' store value in cache _readResultCache.Add(propertyName, result) End If Return result End Function The VerifyAuthorizationCache() method does two things. First, it ensures that the cache of authorization values is initialized, and second, it reinitializes the cache if the current principal has changed. In other words, this method makes sure the cache is ready for use and also that cached values for one user aren t used for a different user. The TryGetValue() method is used to efficiently retrieve any cached value for a property from the cache. If there is no cached value for this property, the authorization rules are checked for this property. The default authorization rules used by CSLA .NET are permissive. In other words, by default all users are allowed to read and write all properties (and to execute all methods). Table 12-6 lists the results of allowing or denying specific roles access.
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CHAPTER 5 GETTING THE MOST OUT OF VE RTICES
Example of the using Statement
Table 5-15. Properties of the System.Net.Socket.UdpSingleSourceMulticastClient Class
Allow
thread. BeginInvoke returns an instance of the interface [mscorlib]System.IAsyncResult, carrying the object you passed as the last parameter. Remember that since interfaces, delegates, and objects are reference types, when I say takes a delegate or returns an interface, I actually mean a reference. If you want to be notified immediately when the call is completed, you must specify the AsyncCallback delegate. The respective callback method is called upon the completion of the asynchronous call. This event-driven technique is the most widely used way to react to the completion of the asynchronous calls. You might choose another way to monitor the status of the asynchronous call thread: polling from the main thread. The returned interface has the method bool get_IsCompleted(), which returns true when the asynchronous call is completed. You can call this method from time to time from the main thread to find out whether the call is finished. You can also call another method of the returned interface, get_AsyncWaitHandle, which returns a wait handle, an instance of the [mscorlib]System.Threading.WaitHandle class. After you get the wait handle, you can monitor it any way you please (similar to the use of the Win32 APIs WaitForSingleObject and WaitForMultipleObjects). If you are curious, disassemble Mscorlib.dll and take a look at this class. If you have chosen to employ a polling technique, you can forgo the callback function and specify null instead of the System.AsyncCallback delegate instance. The EndInvoke method takes the [mscorlib]System.IAsyncResult interface, returned by BeginInvoke, as its single argument and returns void. This method waits for the asynchronous call to complete, blocking the calling thread, so calling it immediately after BeginInvoke is equivalent to a synchronous call using Invoke. EndInvoke must be called eventually in order to clear the corresponding runtime threading table entry, but it should be done when you know that the asynchronous call has been completed. All four methods of a delegate are virtual, and their implementation is provided by the CLR itself the user does not need to write the body of these methods. When defining a delegate, we can simply declare the methods without providing implementation for them, as shown here: .class public sealed MyDelegate extends [mscorlib]System.MulticastDelegate { .method public hidebysig instance void .ctor(object MethodsClass, native unsigned int MethodPtr) runtime managed { } .method public hidebysig virtual instance int32 Invoke(void* Arg1, void* Arg2) runtime managed { } .method public hidebysig newslot virtual instance class [mscorlib]System.IAsyncResult BeginInvoke(void* Arg1, void* Arg2, class [mscorlib]System.AsyncCallback callBkPtr, object) runtime managed { }
internal set { _comments = value; } } } The new property declaration Comments is of the type IList. When an instance of Book is loaded, NHibernate will select from COMMENTS the associated comments. These are then loaded into a list that is assigned to the property Comments. If you happen to know Hibernate or NHibernate, please don t question my previous statement. I ll get to the nitty-gritty details in a moment. For now, just consider that, when loading Book, the associated Comments are selected and loaded. From a SQL perspective, the following statements are executed when loading an instance of Book (note that actual NHibernate SQL statements reference the fields individually, but I use a * to keep things simple): SELECT * FROM BOOKS WHERE ISBN= SELECT * FROM COMMENTS WHERE PARENT_ISBN= For reference, this means in the default case of loading Book, there will be two SQL statements executed for every book that is loaded. The association of IList to Comments isn t something that NHibernate can figure out on its own. The mapping configuration file for Book has to be modified to include a reference to the Comments as follows: <hibernate-mapping xmlns="urn:nhibernate-mapping-2.0"> <class name="Chap08.ObjectRelational.Book, Chap08.ObjectRelational" table="BOOKS"> <id name="ISBN" column="ISBN"> <generator class="assigned" /> </id> <property name="Title" /> <property name="Author" /> <bag name="Comments"> <key column="PARENT_ISBN" /> <one-to-many class="Chap08.ObjectRelational.Comment, Chap08.ObjectRelational" /> </bag> </class> </hibernate-mapping> What is new in the Book mapping configuration file is the XML tag bag. NHibernate associates a bag as a collection. Like the XML tag property, the name attribute defines the name of the property, which must be of the type IList. The bag tag is straightforward; it associates a collection of comments with a book. Within the XML tag bag are two child tags. The child tag key represents the column of the other table that will be associated with the XML tag id. Simply put, whatever ISBN equals for the BOOKS table, it must match PARENT_ISBN in the other table. What is yet unknown is the other table. That is resolved by using the XML tag one-to-many. One-to-many defines the class identifier (Chap08.ObjectRelational.Comment) that will be stored in the IList collections.
We need to create an Entity Framework data model so that we can read and write the data to the database using C# objects. Prepare the database, and create the data model following the steps in the Getting Ready section of 30. I am not going to repeat the steps here because they are identical to those we followed when exploring LINQ to Entities.
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