ASP.NET Web PDF Document Viewer/Editor Control Library

In JavaScript, you refer to an HTML control by prefixing it with the name of the form that it is on. In this case, the form is called form1, and hence you can get the value of the txtMake field using form1.txtMake.value. Your web service proxy has the same name as the service itself. In this case, the service is called CarService and thus so is the proxy. In many cases you may have a dot-separated hierarchy of names for your web service (that is, MathFunctions.Services.DepreciationService), in which case you would use that as the name of your proxy too. The rule of thumb you can use, if in doubt, is to look up the value of the Class= attribute in the .asmx file and use that. Now, you may notice that your getCarValue web method took only three parameters, but now you are passing five parameters. The additional ones are the callback functions that you specify upon successful completion of the service call and upon a timeout of the service call. This handles Ajax asynchrony for you completely under the hood! In this example, you implement the callback functions like this: function OnComplete(result) { alert("Car is worth: $" + result); } function OnTimeOut(result) { alert("Timeout: " + result); } The web method returns a value, and this is passed as result to both the successful and the timeout callbacks. In the case of a successful request/response, this will contain the calculated value of the car. Figure 3-16 shows the application calculating the price of a 2005 Honda Pilot at $38,000, with the client JavaScript invoking the web service and displaying the result.

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[XmlIgnore] public string LastName { get; set; }

The other change is to tell XML serialization that you in fact do not want the Last Name property to be serialized at all. You do this by adding the XmlIgnoreAttribute to the property. As you can see from the sample output, the Customer object is serialized without LastName, exactly as we asked. However, you have probably noticed that when the object is deserialized, its Last Name property is lost. Because it is not serialized, the XmlSerializer is unable to assign it any value. Therefore, its value is left as the default, which is an empty string. So in practice, you would exclude from serialization only those properties you don t need or can compute or can retrieve in other ways.

Notice that the ! operator was used to invert the scope. The expression !win32:!macx means not win32 nor macx.

Summary

In this chapter, we saw how to use the LINQ to XML classes to build objects representing the structure of an XML document, which can then be converted into an XML document, and we saw how the same classes can be used to load XML from a string or file back into memory as objects. These classes support LINQ, both for building new XML documents and for searching for information in existing XML documents. And we also saw how XML serialization can hide some of the details of XML handling behind ordinary C# classes in situations where you know exactly what structure of XML to expect.

Most interesting computer systems are distributed these days it s increasingly unusual for a program to run in isolation on a single machine. So .NET provides various ways to communicate across networks. The array of networking options looks a little bewildering at first: there are 10 namespaces whose names start with System.Net containing more than 250 classes, and that s not even the complete set there s an even bigger API for producing and consuming web services. Fortunately, it s simpler than this makes it seem despite the large API surface area most of the options fall into three categories. There s WCF the Windows Communication Foundation, a framework for building and using web services. There are lowerlevel APIs for working directly with web protocols. Or you can use sockets if you need very low-level control. We ll start by discussing how to choose the most appropriate style of communication for your application, and then we ll look at these three options in more detail.

If you want to be able to show debug output, you can add the value console to the CONFIG variable. A more delicate way of doing this is to limit the change to Windows and debug mode applications: win32:debug:CONFIG += console It ensures that you do not open a console window for applications built in release mode. Another issue that you need to take care of when building applications for the Windows platform is the application icon (the icon that Explorer uses when showing the executable).