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The code file the global.asax inherits from doesn t have to be in the App_Code directory. In ASP.NET 1.x, it was compiled into the assembly containing all the compiled code behind for the pages. You could place a standalone assembly into the bin directory (and add a reference to it to have the IDE copy it in), and reference the fully qualified name of a type in that assembly that inherits from HttpApplication. This is an easy strategy for reusing your global.asax implementation across different IIS applications. Just add a reference to the assembly within whatever application you want to use it from. Of course, you ll need to add a reference to the System.Web assembly in the project where you create the assembly, as this is where HttpApplication is defined. You can even create the class as an abstract base class and have functionality that s customizable from application to application. Let s take at look reusing a definition of HttpApplication across different IIS Applications by creating a new class library project as shown in Figure 2-7.
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Figure 2-7. Add the project dialog. Select the Visual C# project type and the Class Library template. Add a reference to the System.Web assembly by right-clicking the References folder and choosing Add Reference, as shown in Figure 2-8.
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Figure 2-8. The Add Reference dialog. Select the .NET tab and the System.Web.dll assembly. Add a class file to the project and name it GenericAbstractHttpApp. Here s the code you can provide for this new abstract base class: using System; using System.Web; using System.Web.Mail; namespace HttpAppReuse { public abstract class GenericAbstractHttpApp : HttpApplication { public GenericAbstractHttpApp() { this.Error += new EventHandler(GenericAbstractHttpApp_Error); this.BeginRequest += new EventHandler(GenericAbstractHttpApp_BeginRequest); } public abstract bool RequiresSSL { get; } private void GenericAbstractHttpApp_Error(object sender, EventArgs e) { HttpContext ctx = HttpContext.Current; Exception ex = this.Server.GetLastError(); MailMessage m = new MailMessage(); string sBody;
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sBody = ex.Message + "\n"; sBody += ex.StackTrace; Exception ie = ex.InnerException; Exception last = ex; while (ie != null) { sBody += "\n\n--------------------------"; sBody += "\n" + ie.Message; sBody += "\n" + ie.StackTrace; last = ie; ie = ie.InnerException; } m.To = "YourEmail@YourDomain.com"; m.Subject = "Intertech Training Exception"; m.Body = sBody; m.From = "Exception@IntertechTraining.com"; SmtpMail.Send(m); Response.Redirect(String.Format ("/ErrorOccurred.aspx Message={0}", Server.UrlEncode(last.Message))); } void GenericAbstractHttpApp_BeginRequest(object sender, EventArgs e) { HttpContext ctx = HttpContext.Current; if (this.RequiresSSL) if (!ctx.Request.IsSecureConnection) ctx.Response.Redirect( Request.Url.ToString().Replace("http:", "https:")); } } } This class provides two pieces of functionality. The first is in the application s Error event. Any IIS application that uses this class as its base class for the global.asax e-mails any error that occurs to the recipient specified in the To line of the mail message. This includes the entire call stack of the error and the type and line number where the error occurred. The Error event trap then redirects to a generic error page. The second piece of functionality enforces that a site must be served over Secure Sockets Layer (SSL). This is where the abstract member becomes relevant. This is functionality you don t want to leverage from any site, only those that need to be served over a secure channel.
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E-mailing the error message is functionality that can be used from any application, so the abstract Boolean RequiresSSL allows consumers of our type to choose to run this functionality or not. You can leverage this functionality from your existing website. From the Web project, add a reference to the assembly you ve just created, as shown in Figure 2-9.
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Figure 2-9. The Add Reference dialog. Select the Browse tab and the assembly created in the last step. Now change the MyImpl class to inherit from your new base class instead of directly from HttpApplication: public class MyImpl : HttpAppReuse.GenericAbstractHttpApp Since the new base class is abstract, you must also override its abstract member. public override bool RequiresSSL { get { return true; } } Now all requests to .NET resources in your application will be forced to SLL. You could set the property to false and continue to leverage the error handling mechanism without forcing pages to be served over a secure channel. Notice also that your existing event traps continue to work. You re now extending the functionality of your standalone base class instead of HttpApplication. If you don t need to vary functionality across applications, you can create your class as a concrete base class instead of an abstract one. Then you can reference the class name directly from the Inherits attribute of the Application directive in your global.asax.
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