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The IClientMessageInspector interface requires implementation of two methods. The first is called BeforeSendRequest. It will be invoked immediately before the message is sent to the client. In this exercise, the TraceMessage method will be called, passing a copy of the message. 7. Add the following code below the TraceMessage method:

long time ago, I was teaching a class on Microsoft System Management Server (SMS). One of my students was trying to query the SQL database created by SMS

' VB Public Function BeforeSendRequest(ByRef request As Message, _ Channel As IClientChannel) As Object _ Implements IClientMessageInspector.BeforeSendRequest request = TraceMessage(request.CreateBufferedCopy(Integer.MaxValue)) Return Nothing End Function // C# public object BeforeSendRequest(ref Message request, IClientChannel channel) { request = TraceMessage(request.CreateBufferedCopy(int.MaxValue)); return null; }

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trying to build a report that included computers with certain hardware specifications that did not have Microsoft Windows 98 (I told you it was a long time ago) installed on them yet. Because he was using a combination of AND, NOT, and OR and did not understand the order of operations for the Boolean operators, he was getting incorrect results and was blaming SMS because the installations were failing for various reasons (Windows 98 already installed, improper hardware configurations, and so on). I asked him to bring his query to class with him the next day. We added some parentheses to his query and he took it back to work to try it. The installations succeeded because the new query returned the correct set of workstations from the database. To avoid problems like this, use the following rule: When in doubt, use parentheses.

The second method the IClientMessageInspector interface includes is named AfterReceiveReply. It is invoked after the response comes back from the service.

Using the AND operator typically results in a smaller result set, thus improving performance. The NOT operator typically hurts performance because the query optimizer cannot use indexes for the WHERE clause when a NOT operator is specified. For indexes to be utilized when an OR operator is specified, all columns referenced by the OR condition must be included in an index or none of the indexes are used. The LIKE clause allows you to match a character string found in a column to a specified pattern in the WHERE clause. The LIKE clause uses the following wildcard characters:

8. Add the following code below the BeforeSendRequest method:

Percent (%) Replaces any number of characters (including 0 characters) in the string. For example, %at would match at, cat, hat, and that. Underscore(_)

' VB Public Sub AfterReceiveReply(ByRef reply As Message, _ correlationState As object) _ Implements IClientMessageInspector.AfterReceiveReply reply = TraceMessage(reply.CreateBufferedCopy(Integer.MaxValue)) End Sub // C# public void AfterReceiveReply(ref Message reply, object correlationState) { reply = TraceMessage(reply.CreateBufferedCopy(int.MaxValue)); }

Replaces exactly one character in the string. For example, _at would match cat and hat, but it would not match that or at.

Now that the message inspector has been created, it needs to be associated with an endpoint behavior. To do this, you must create a class that implements the IEndpointBehavior interface. 9. In Solution Explorer, right-click the TestClient project, choose Add, and then select Class from the context menu. 10. In the Add New Item dialog box, change the name of the class file to TraceMessageBehavior and click Add. 11. Add the following statements to the top of the file:

Square brackets ([ ]) Replaces any one character within a set or a range of characters. A set is frequently displayed as a straight list of characters, for example, [abcd]; but the characters can be separated by commas to add clarity, for example, [a,b,c,d]. A range is separated by a dash, for example, [a d]. Each of these three options includes all rows where the specified character is an a, b, c, or d.

' VB Imports Imports Imports Imports // C# using using using using System.ServiceModel.Channels System.ServiceModel.Dispatcher System.ServiceModel.Description System.ServiceModel

Any character not within a set or range of characters. For example, [^a-d] would be equal to [e z].

System.ServiceModel.Channels; System.ServiceModel.Dispatcher; System.ServiceModel.Description; System.ServiceModel;

caret (^)

12. Change the declaration of the TraceMessageBehavior class so that it indicates that the IEndpointBehavior interface will be implemented. Modify the declaration to look like the following:

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