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IsStatic) Then If the event handler is contained in a serializable object, it will be added or removed from the serializable delegate; otherwise, it will be added or removed from the nonserialized delegate The thing about events and inheritance is that an event can be raised only by code in the class in which it is declared This is because the event member can be accessed directly only from the class in which it is defined It can t be raised by code in classes that inherit from this class This means that business objects can t raise the PropertyChanged event directly, even though that is the goal To solve this problem, the code follows a standard NET design pattern by creating a Protected method that in turn raises the event <EditorBrowsable(EditorBrowsableStateAdvanced)> _ Protected Overridable Sub OnPropertyChanged(ByVal propertyName As String) If _nonSerializableHandlers IsNot Nothing Then _nonSerializableHandlers.

sqlite> select id, name from foods where name like '%ac%P%'; id name ----- -------------------127 Guacamole Dip 168 Peach Schnapps 198 Mackinaw Peaches Another useful trick is to use NOT to negate a pattern: sqlite> select id, name from foods where name like '%ac%P%' and name not like '%Sch%' id ----38 127 198 name -------------------Pie (Blackberry) Pie Guacamole Dip Mackinaw peaches

The SOAPSender application requests stock quotes from the SOAP service using two possible internal method calls: SendUnsignedRequest: Sends an unsigned stock quote request to the SOAPService RequestQuote operation. SignRequestUsingX509Certificate: Sends a digitally signed stock quote request to the SOAPService RequestQuote operation. The digital signature is based on an X.509 certificate.

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Invoke(Me, New PropertyChangedEventArgs(propertyName)) End If If _serializableHandlers IsNot Nothing Then _serializableHandlersInvoke(Me, New PropertyChangedEventArgs(propertyName)) End If End Sub Any classes that inherit from the base class can call this method when they want to raise the event This method is marked with the EditorBrowsable attribute, indicating that this is an advanced method In C#, this means that the method won t appear in IntelliSense unless the IDE is set to show advanced members In VB, this means that the method appears in the All tab in IntelliSense but won t appear in the Common tab The OnUnknownPropertyChanged() method covers a special case, different from the OnPropertyChanged() method Where OnPropertyChanged() method raises the PropertyChanged event for a single property, OnUnknownPropertyChanged() raises the event for a property with no name <EditorBrowsable(EditorBrowsableStateAdvanced)> _ Protected Overridable Sub OnUnknownPropertyChanged() OnPropertyChanged(String.

The glob operator is very similar in behavior to the like operator. Its key difference is that it behaves much like Unix or Linux file globbing semantics in those operating systems. This means it uses the wildcards associated with file globbing such as * and _ and that matching is case sensitive. The following example demonstrates glob in action: sqlite> select id, name from foods ...> where name glob 'Pine*'; id ---------205 258 name ---------Pineapple Pineapple

Empty) End Sub There are a number of cases in which the object s state will change in such a way that it isn t possible to know which properties actually changed In that case, this blanket notification approach ensures that data binding is aware that something changed, so the UI updates as needed Passing a property name of StringEmpty or Nothing is a magic value that tells data binding to refresh all bound property values The result is a base class that allows business objects to raise the PropertyChanged event, thereby supporting data binding and serialization..

Each of these method calls invokes the same proxy class. The difference between the two methods is simply whether the request message will be sent out as signed or not. The Web service proxy class provides two possible URIs for requesting a stock quote, as shown in Listing 8-11. One URI requests the quote directly from the Web service, while the other URI requests the quote via the SOAP router, which provides an .asmx file of the same name, although the virtual directory name is different. Listing 8-11. Service Endpoints for the SOAPSender Application public StockTraderServiceWse() { // Note to user: toggle between each of these URLs // 1. SOAPService goes directly to the service //this.Url = "http://localhost/SOAPService/StockTrader.asmx"; // 2. SOAPRouter goes to the service via a router this.Url = "http://localhost/SOAPRouter/StockTrader.asmx"; } Of course, in a production setting, the SOAPService would not be directly accessible from outside clients. Instead, they would be forced to route their request through the SOAPRouter.

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