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A proxy generation tool must discover the composition of a service at runtime before it can do its work. In WCF, you allow this runtime discovery to occur by enabling MEX. Again, most host configuration files need to enable MEX (at least during development); fortunately, the way you configure MEX seldom changes, so .NET 4.0 provides a few handy shortcuts. The most useful shortcut is out-of-the-box MEX support. You don t need to add a MEX endpoint, define a named MEX service behavior, and then connect the named binding to the service (as you did in the HTTP version of the MagicEightBallServiceHost); instead, you can now simply add the following:

To make this step easier, it makes sense to add a new constructor to the EncryptedQueryString class that accepts the encrypted string, as follows: Public Sub New(ByVal encryptedData As String) ' Decrypt data passed in using DPAPI Dim RawData As Byte() = HexEncodingGetBytes(encryptedData).

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<configuration> <system.serviceModel> <services> <service name="MagicEightBallServiceLib.MagicEightBallService" > <host> <baseAddresses> <add baseAddress="http://localhost:8080/MagicEightBallService"/> <add baseAddress= "net.tcp://localhost:8099/MagicEightBallService"/> </baseAddresses> </host> </service> </services> <bindings> <basicHttpBinding> <binding openTimeout = "00:00:30" /> </basicHttpBinding> <netTcpBinding> <binding closeTimeout="00:00:15"/> </netTcpBinding> </bindings> <behaviors> <serviceBehaviors> <behavior> <!-- To get default MEX, don't name your <serviceMetadata> element--> <serviceMetadata httpGetEnabled="true"/> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> </configuration> The trick is that the <serviceMetadata> element no longer has a name attribute (also notice the <service> element no longer needs the behaviorConfiguration attribute). With this adjustment, you get free MEX support at runtime. To test this, you can run your host (after you compile to refresh the configuration file) and type in the following URL in a browser: http://localhost:8080/MagicEightBallService Once you do this, you can click the wsdl link at the top of the web page to see the WSDL description of the service (see Figure 25-6 for a refresher). Note that you do not see the host s console window print out data for the MEX endpoint because you have not explicitly defined an endpoint for IMetadataExchange in your configuration file. Nevertheless, MEX is enabled, and you can start to build client proxies.

Dim ClearRawData As Byte() = ProtectedData.Unprotect(RawData, Nothing, DataProtectionScope.LocalMachine) Dim StringData As String = Encoding.UTF8.GetString(ClearRawData) ' Split the data, and add the contents Dim Index As Integer Dim SplittedData As String() = StringData.Split(New Char() { "&"c }) For Each SingleData As String In SplittedData Index = SingleData.IndexOf("="c) MyBase.Add(HttpUtility.UrlDecode (SingleData.Substring(0, Index)), HttpUtility.UrlDecode(SingleData.Substring(Index + 1))) Next End Sub This constructor first decodes the hexadecimal information from the string passed in and uses the DPAPI to decrypt information stored in the query string. It then splits the information back into its parts and adds the key/value pairs to the base StringCollection. Now you have the entire infrastructure in place to create a simple test page and transmit information from one page to another in a secure fashion.

Assuming your updated host has been compiled and is running in the background, you will now want to open the client application and refresh the current service reference. Begin by opening the Service References folder found in the Solution Explorer. Next, right-click the current ServiceReference and pick the Update Service Reference menu option (see Figure 25-8).

The uniqueResult() method allow the retrieval of just one object from an HQL query. If your query returns more than one result, the uniqueResult() method will return a NonUniqueResultException.

Figure 25-8. Refreshing the proxy and client side *.config file Once you done this, you will see that the client side *.config file has two bindings to select from: one for HTTP and one for TCP. As you can see, you give each binding a fitting name. Here is a partial listing of the refreshed configuration file: <configuration> <system.serviceModel> <bindings> <basicHttpBinding> <binding name="BasicHttpBinding_IEightBall" ... /> </basicHttpBinding> <netTcpBinding> <binding name="NetTcpBinding_IEightBall" ... /> </netTcpBinding> </bindings> ... </system.serviceModel> </configuration>

To try the EncryptedQueryString class, you need two pages one that sets the query string and redirects the user and another that retrieves the query string. The first one contains a text box for entering information, as follows: <form id="form1" runat="server"> <div> Enter some data here: <asp:TextBox runat="server" ID="MyData" /> <br /> <br /> <asp:Button ID="SendCommand" runat="server" Text="Send Info" OnClick="SendCommand_Click" /> </div> </form> When the user clicks the SendCommand button, the page sends the encrypted query string to the receiving page, as follows: Protected Sub SendCommand_Click(ByVal sender As Object, ByVal e As EventArgs) Dim QueryString As New EncryptedQueryString() QueryString.Add("MyData", MyData.Text) QueryString.Add("MyTime", DateTime.Now.ToLongTimeString()) QueryString.Add("MyDate", DateTime.Now.ToLongDateString()) Response.Redirect("QueryStringRecipient.aspx data=" & QueryString.ToString()) End Sub Notice that the page enters the complete encrypted data string as one parameter called data into the query string for the destination page. Figure 25-9 shows the page in action.

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