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The last programming step is to modify the default RenderWebPart() method and to add one helper function to read the XML and transform it using an XML web control, as shown in the following listing: Listing 4-11. XML Web Part s RenderWebPart() Method Protected Overrides Sub RenderWebPart(ByVal output As System.Web.UI.HtmlTextWriter) Try If Debug Then MyBase.ShowDebugText(output) output.Write("<hr>") output.Write("<br>XML Source=<b>" & XMLSource & "</b>") output.Write("<br>XML Source (tokens replaced)=<b>" & _ ReplaceMyTokens(XMLSource) & "</b>") output.Write("<br>XSL Source=<b>" & XSLSource & "</b>") output.Write("<br>XSL Source (tokens replaced)=<b>" & _ ReplaceMyTokens(XSLSource) & "</b>") output.Write("<hr>") End If If CanAccess() Then Dim xml As New System.Web.UI.WebControls.Xml xml.DocumentContent = GetUrlAsString(XMLSource) xml.TransformSource = ReplaceMyTokens(XSLSource) xml.RenderControl(output) End If Catch ex As Exception output.Write("<font color=red>" & ex.Message & "</font>") End Try End Sub The helper function GetUrlAsString() is used to make a web request to the specified URL of the XML source and convert the result into a string. Listing 4-12. GetUrlAsString() Function Private Function GetUrlAsString(ByVal strUrl As String) As String Dim wReq As System.Net.WebRequest wReq = System.Net.WebRequest.Create(strUrl) wReq.Credentials = Net.CredentialCache.DefaultCredentials ' Return the response. Dim wResp As System.Net.WebResponse = wReq.GetResponse() ' Read the response stream into a string Dim respStream As System.IO.Stream = wResp.GetResponseStream Dim respStreamReader As New System.IO.StreamReader(respStream, _

using System.Runtime.Remoting.Channels; using System.Runtime.Remoting.Proxies; using System.Threading; namespace Client { class Client { delegate void SetValueDelegate(int value); delegate String GetNameDelegate(); static void Main(string[] args) { DateTime start = System.DateTime.Now; HttpChannel channel = new HttpChannel(); ChannelServices.RegisterChannel(channel); IMyRemoteObject obj = (IMyRemoteObject) Activator.GetObject( typeof(IMyRemoteObject), "http://localhost:1234/MyRemoteObject.soap"); Console.WriteLine("Client.Main(): Reference to rem.obj. acquired"); Console.WriteLine("Client.Main(): Will call setValue(42)"); SetValueDelegate svDelegate = new SetValueDelegate(obj.SetValue); IAsyncResult svAsyncres = svDelegate.BeginInvoke(42,null,null); Console.WriteLine("Client.Main(): Invocation done"); Console.WriteLine("Client.Main(): Will call GetName()"); GetNameDelegate gnDelegate = new GetNameDelegate(obj.GetName); IAsyncResult gnAsyncres = gnDelegate.BeginInvoke(null,null); Console.WriteLine("Client.Main(): Invocation done"); Console.WriteLine("Client.Main(): EndInvoke for SetValue()"); svDelegate.EndInvoke(svAsyncres); Console.WriteLine("Client.Main(): EndInvoke for SetName()"); String name = gnDelegate.EndInvoke(gnAsyncres); Console.WriteLine("Client.Main(): received name {0}",name); Console.WriteLine("Client.Main(): Will now read value"); int tmp = obj.GetValue(); Console.WriteLine("Client.Main(): New server side value {0}", tmp); DateTime end = System.DateTime.Now; TimeSpan duration = end.Subtract(start);

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The address in Figure 3-32 is defined using the following notation in a particular language: street, town, and country. If you think about it, you don t need more information than that. You can also define an address using zip code and country. Regardless of how you define the address, Map24 attempts to figure out what the address is referencing. If Map24 cannot figure it out, then an error will be generated. This sort of input is interesting, because you need to create a generic format preprocessor. Let s compare what this means in terms of the validation recipe illustrated at the beginning of this chapter. Figure 3-33 shows the modified validation architecture that adds two numbers together.

Console.WriteLine("Client.Main(): Execution took {0} seconds.", duration.Seconds); Console.ReadLine(); } } } When looking in the client s output in Figure 3-18, you can see that both long-running methods have been called at nearly the same time. This results in improved runtime performance, taking the execution time down from 12 seconds to 8 at the expense of making the application slightly more complex.

Figure 3-18. Client output when using asynchronous calls The server output in Figure 3-19 shows that both methods have been entered on the server at the same time without blocking the client.

The validation architecture has changed from two fields to a single-field form. The singlefield form has a single text box that accepts a buffer in the form [number]+[number]. The buffer is validated on the client side to contain the numbers and operator. On the server side, the data would be preprocessed and the individual numbers and operator would be extracted and assigned to a state. The state is then validated and passed to the underlying business logic. The advantage of using a search-engine-type approach is that users can define a buffer as [number] + [number] + [number] wiithout having to change the user interface. You would need to make some minor changes to the client-side validation logic and some minor changes to the server-side preprocessor. Going back to Figure 3-32, entering the validation information and clicking the Next button results in something similar to Figure 3-34.

System.Text.Encoding.ASCII) Dim strXML As String = respStreamReader.ReadToEnd Return strXML End Function

One-way calls are a little different from asynchronous calls in the respect that the .NET Framework does not guarantee their execution. In addition, the methods used in this kind of call cannot have return values or out parameters. You can also use delegates to call one-way methods asynchronously, but the EndInvoke() function will exit immediately without checking whether the server has finished processing yet. No exceptions are thrown, even if the remote server is

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