c# thoughtworks qrcode Emitting Custom Trace Data in C#.NET

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Emitting Custom Trace Data
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You can use the Trace class in the System.Diagnostics namespace to add your own trace messages to the data that is displayed by ASP.NET tracing. This class is exposed as a member of the Page object. This allows you to call Page.Trace (or just Trace). You use the Write method of this object to write a message to the trace log. When doing so, you can provide a category and the message. The following shows an example of writing to the trace log. Here a message is added to the log when the page is loaded and when a user clicks the button on the page. The category of the message is set to Custom Category. This category allows you to find your message easily. Custom messages are embedded in the Trace Information section of the trace details.
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Sample of Visual Basic Code Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load Trace.Write("Custom Category", "Page_Load called") End Sub Protected Sub Button1_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Button1.Click Trace.Write("Custom Category", "Button1_Click called") End Sub Sample of C# Code protected void Page_Load(object sender, EventArgs e) { Trace.Write("Custom Category", "Page_Load called"); } protected void Button1_Click(object sender, EventArgs e) { Trace.Write("Custom Category", "Button1_Click called"); }
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Tracing AJAX Applications
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Debugging an AJAX application presents its own issues. You do not have a server process on which to rely. Instead, you have to try to debug the code as it executes in the browser. In the previous section, you saw how to do this. However, AJAX-enabled applications tend to have a lot of client code, so they might present more issues when they are being debugged. For this reason, the Microsoft AJAX Library provides the Sys.Debug client-side namespace. The tracing you enable on the server is not fired for AJAX partial-page requests. Therefore, you will see nothing in the Trace.axd log for these types of requests. Instead, you must use the features of Sys.Debug to write out trace messages. The Debug class includes the assert, trace, clearTrace, traceDump, and fail methods. These methods can be used to display and manage messages to a trace log based on your needs. As an example, suppose you write out a message by using Sys.Debug.trace. Of course, your page must include the Microsoft AJAX Library JavaScript file. You make this happen by adding a ScriptManager control to your page. (See 9, Working with Client-Side Scripting, AJAX, and jQuery, for more details on working with AJAX.) The following markup shows part of an ASPX page that includes a ScriptManager control and a JavaScript function named button1_ onclick. When this function is fired (when the user clicks button1), the trace method is called.
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<html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server"> <title>AJAX Trace Example</title> <script language="javascript" type="text/javascript"> function button1_onclick() { Sys.Debug.trace("Button1 clicked"); } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <input id="Button1" type="button" value="button" onclick="button1_onclick()" /> </div> </form> </body> </html>
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real World
Tony Northrup
isual Studio 2010 is definitely the best tool for writing and debugging ASP.NET code. When it comes to debugging complex problems in client-side JavaScript,
however, you can do better. Visual Studio almost always gives you broad errors that make it difficult to isolate the real problem, and it often highlights code within a library, rather than in your JavaScript. The most efficient tool I ve found for debugging JavaScript is the free Firebug plug-in for the Firefox browser. It provides excellent warnings about inconsistencies in your code (such as a missing quote or bracket), and it gives genuinely useful feedback about problems.
You can view the trace messages displayed by the Microsoft AJAX Library in the Visual Studio Output window. This works if you are using Internet Explorer and Visual Studio, and if you are debugging on the same machine on which the website is running. However, you can also create a TextArea control on the page that includes your JavaScript. If you set the TextArea control s ID to TraceConsole. this tells the Microsoft AJAX Library to display its trace messages to this TextArea for you to view. If the browser you are using for debugging has
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