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public static object CallMethod( object obj, MethodInfo info, params object[] parameters) { // call a private method on the object object result; try { result = info.Invoke(obj, parameters); } catch (Exception e) { throw new Csla.Server.CallMethodException( info.Name + " " + Resources.MethodCallFailed, e.InnerException); } return result; } The first version accepts the method name as a string value, while the second accepts a MethodInfo object. In the first case, GetMethod() is called to retrieve a matching MethodInfo object. If one isn t found, an exception is thrown; otherwise, the second version of CallMethod() is invoked. The second version of CallMethod() actually invokes the method by using the MethodInfo object. The interesting bit here is the way exceptions are handled. Since reflection is being used to invoke the business method, any exceptions that occur in the business code end up being wrapped within a reflection exception. To business developers, the exception from reflection isn t very useful. They want the actual exception that occurred within their business method. To resolve this, when an exception is thrown as the business method is invoked, it is caught, and the InnerException of the reflection exception is wrapped within a new Csla.Server.CallMethodException. Effectively, the reflection exception is stripped off and discarded, leaving only the original exception thrown within the business code. That exception is then wrapped within a CSLA .NET exception so the name of the failed business method can be returned as well.

Now that you have the basic machinery to easily parse, simplify, and differentiate expressions, you need to be looking at how to visualize them to really enjoy the benefits of the application. The rendering engine (placed in VisualExpr.fs) has two main parts: converting expressions to VisualExpr values and then rendering them directly. Ideally, you should hide the representation of the VisualExpr (and its related VisualElement) type by a signature (not shown here) so that it is not possible to construct these values directly. Before we get to the conversion and rendering functions, there is a bit of setup to do. For controlling how the different parts of an expression are rendered on the screen, we introduce the RenderOptions type containing the fonts and pen (which determines the color used to draw) that will be applied during rendering. Listing 12-8 shows the code that defines the rendering options used in the remainder of this sample. Listing 12-8. Rendering Options for the Visual Symbolic Differentiation Application #light namespace Symbolic.Expressions.Visual open open open open Symbolic.Expressions System.Drawing System.Drawing.Imaging Math

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The CallMethodIfImplemented() method is similar to the CallMethod() methods mentioned previously, but it doesn t throw an exception if the method doesn t exist on the business class. public static object CallMethodIfImplemented( object obj, string method, params object[] parameters) { MethodInfo info = GetMethod(obj.GetType(), method, parameters); if (info != null) return CallMethod(obj, info, parameters); else return null; } This is the same basic code as the first CallMethod() implementation, except that it doesn t throw an exception if the method isn t found. Instead, it simply returns a null value. CallMethodIfImplemented() is used by Csla.Server.SimpleDataPortal to invoke optional methods on the business class methods that should be invoked if implemented by the business developer, but which shouldn t cause failure if they aren t implemented at all. An example is DataPortal_OnData PortalInvoke(), which is purely optional, but should be called if it has been implemented by the business developer.

The magic of Ajax is achieved by using the XMLHttpRequest object. This object acts as an intermediary between your script in the web browser (client) and the server. Instead of the web browser, JavaScript initiates the requests, and as a result, must also handle the response. The XMLHttpRequest object it is a relatively new standard (part of HTML5), however, it has a long history and is widely supported in modern web browsers. Unfortunately, different browsers implement XMLHttpRequest in different ways. So for the best results, you ll need to branch your code. To work with an example, start by creating the following HTML file and call it ajax.html: <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Ajax</title> </head> <body> <div id="new"></div> <script src="scripts/addLoadEvent.js"></script> <script src="scripts/getHTTPObject.js"></script> <script src="scripts/getNewContent.js"></script> </body> </html> This HTML file includes a scripts folder with the addLoadEvent.js, as well as two new scripts: getHTTPObject.js and getNewContent.js. To simulate the server response, alongside the ajax.html file, create a response.txt file with the following text content: This was loaded asynchronously!

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