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Other debugging techniques

From: Visual Studio 2010 Essential Training

Video: Other debugging techniques

Continuing our quest to master the debugging tools in Visual Studio, I am going to cover trace points, attaching a debugger to a running process, and debugging a web site. So let's get started! I am inside the solution called OtherDebuggingTechniques, and it contains two projects: AttachToConsole and DebugWebApp. I am going to start by showing you something called a tracepoint. To do that, I am going to double-click on this Program.cs. If you've watched the other movies in this chapter, you know that you can add a breakpoint by clicking in this margin or pressing F9.

Other debugging techniques

Continuing our quest to master the debugging tools in Visual Studio, I am going to cover trace points, attaching a debugger to a running process, and debugging a web site. So let's get started! I am inside the solution called OtherDebuggingTechniques, and it contains two projects: AttachToConsole and DebugWebApp. I am going to start by showing you something called a tracepoint. To do that, I am going to double-click on this Program.cs. If you've watched the other movies in this chapter, you know that you can add a breakpoint by clicking in this margin or pressing F9.

A breakpoint is hit if you're attached to it debugger, and you run this line of code. It will then stop and let you look at your code. A tracepoint is similar to a breakpoint. When you establish a tracepoint, you also specify additional action that can be taken when it is hit. Let me show you. I am going to right-click on this breakpoint and choose When Hit. Now, it doesn't actually say the word "tracepoint" in here, but this is where you would enable a tracepoint. I click here, and then I get to choose what happens when the debugger encounters this tracepoint.

First of all, I can have an output information to the Output window. I can have it do this silently. If this Continue execution check mark is checked, then it'll print this output to the Output window, but it won't stop and let me look at the code. Let me add a custom string at the front of this, so we can find it easily, and then this is going to print the function name, and this is going to print the thread ID and the thread's name. As you can see, there are other variables I can inject in there. I can also do other actions like run macros, and macros are covered in another chapter in this title.

Macros are little bits of code that you can run from within Visual Studio. I am just going to do this basic tracepoint. Make sure I uncheck this Run a macro first. Click on OK. Notice it has a diamond now instead of a circle? That's how you know it's a tracepoint. Then I am going to do a Debug > Start Debugging. It ask me to enter my name, it says, "Hello Walt," and now if I come over here to my Output window and scroll down to the end-- you may not see this window in your computer; if you don't, you need to go to View > Output--and here at the bottom of the window is my custom output string.

Notice that it didn't stop my code I am running. So that's the tracepoints. Another common task that you might want to do when you are debugging is you might need to have an application already running before you attach a debugger. In other words, you don't want to attach the debugger at the Startup Process. Or another thing that's happening is you're running an application and five or six hours after you started running it, something happens and it doesn't look right, and at that point, you want to start attaching a debugger and taking a look. So, what I am going to do is I am going to run this AttachToConsole application directly.

To do that, I am going to right-click, choose Open Folder in Windows Explorer, open my bin folder and my Debug folder, and run this AttachToConsole. Let me show you how it works. I'll type in my name, and there is the same code we saw before. Now, it's sitting there waiting for my input. I can go back to Visual Studio, go to my Debug menu, and say attach to process.

This dialog shows me all of the running processes on my computer. I am going to look for one called AttachToConsole.exe. That's the one that I am currently running. And then I am going to click Attach. F9 put their breakpoint here, and then I will go back here and press the Enter key, which cause the next line of code to run. And as you can see it now hit my breakpoint. And now at this point, I can do any of my normal debugging task.

I can take this yellow marker and move it to a previous line, I can examine the data in the variables, and so on. For my next demonstration, I want to show you how to debug an ASP.NET web site. So let me close this application by clicking this Stop button, and then I am going to go over to my solution and right-click on the DebugWebApp and tell it to make that my StartUp object. Now, this is a ASP.NET application. So, one of the things that you have to do to make an ASP.NET application debuggable is add a line of code to your Web.config.

By default, Visual Studio does that automatically for you when you create a web project. If it doesn't have a debugging setting, then it'll prompt you and say, would you like to modify the Web.config? So, I have already done that on this application. So all I should have to do is open up this window here, and I'll show you the bit of code I have here. I have an asp:Button in here that has a Button1_Click procedure. And if I press F7, you can see the code behind. This is the ASP page.

Here is the code behind for that, and I have added a breakpoint on this line here where I am getting the DateTime and putting it in this Label. I have also written a JavaScript button down here. Here is an input button. And it has an onclick, which says, you need to run this JavaScript called showMessage, which is up here. And I have added a breakpoint in my HTML for this JavaScript. So, what this is showing is that I can also debug client-side code in ASP.NET applications.

So we have got two breakpoints, right? I need to attach a debugger, so I will choose Debug > Start Debugging. Visual Studio will launch the ASP.NET development server, and then it will launch my web browser, and it attaches the browser to this instance of Internet Explorer. Now, when I click on this button, you'll see that it switches me over to the code behind, and I can hover over the variables here. I can press F11.

I can rewind my code just like before. Seeing my Output information here. There is all my locals and watch windows all work just the way you'd expect. Now, I am going to press F5 to continue, and now I am going to click on this button here which has the JavaScript code. And again, you'll see it's hitting my breakpoint in my HTML page. And again, I can hover over these items, press F11 to step through the code, and so on. Very handy and a welcome addition to web development.

All in all, I'd say the Visual Studio contains a nice selection to debugging tools. In the next movie, I will show you the IntelliTrace tool, which changes the way you think about debugging.

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This video is part of

Image for Visual Studio 2010 Essential Training
Visual Studio 2010 Essential Training

86 video lessons · 30157 viewers

Walt Ritscher
Author

 
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  1. 2m 3s
    1. Welcome
      1m 2s
    2. Using the exercise files
      1m 1s
  2. 7m 19s
    1. Understanding the Visual Studio versions
      3m 51s
    2. Setting up your developer computer
      3m 28s
  3. 58m 2s
    1. Creating a Visual Studio project
      4m 58s
    2. Working with Solution Explorer
      6m 32s
    3. Working with big projects
      3m 53s
    4. Taking a tour of the Integrated Developer Environment (IDE)
      8m 36s
    5. Introducing drag-and-drop UI design
      7m 38s
    6. Working with the Properties window
      6m 44s
    7. Looking at Server Explorer
      7m 4s
    8. Exploring the new Help engine
      6m 41s
    9. Setting options for the IDE
      5m 56s
  4. 39m 25s
    1. Creating a simple WPF application
      1m 32s
    2. Building the UI with the editors
      9m 14s
    3. Working with the application code
      3m 37s
    4. Communicating with the web site
      7m 15s
    5. Connecting your data
      8m 4s
    6. Binding to an RSS feed
      5m 4s
    7. Packaging and deploying the application
      4m 39s
  5. 39m 46s
    1. What languages are supported in Visual Studio 2010?
      1m 17s
    2. Exploring basic settings for the Code Editor
      5m 35s
    3. Writing a C# program
      6m 48s
    4. Writing a VB program
      6m 29s
    5. Working with C++
      6m 38s
    6. Working with F Sharp
      6m 9s
    7. Font and color options
      6m 50s
  6. 1h 5m
    1. Formatting your code
      6m 43s
    2. Navigating your code
      7m 44s
    3. Using the Task List
      2m 26s
    4. Commenting your code
      2m 45s
    5. Documenting your code
      8m 26s
    6. Using IntelliSense effectively
      7m 0s
    7. Working with code snippets
      6m 25s
    8. Refactoring your code
      5m 15s
    9. Understanding code generation
      2m 10s
    10. Generating code with T4
      6m 29s
    11. Using the Class View, Class Designer, and Class Diagram tools
      5m 51s
    12. Refactoring VB with CodeRush Xpress
      4m 33s
  7. 1h 11m
    1. Working with project and item templates
      8m 38s
    2. Creating a console application
      7m 5s
    3. Creating a class library
      6m 26s
    4. Creating a web site with ASP.NET
      7m 37s
    5. Creating a rich internet application with Silverlight
      6m 57s
    6. Creating a classic Windows application with Windows Forms
      10m 31s
    7. Creating a dramatic Windows application with Windows Presentation Foundation (WPF)
      4m 41s
    8. Creating a WCF service
      9m 1s
    9. Using an existing WCF service
      6m 38s
    10. Navigation UI designs with the Document Outline view
      3m 41s
  8. 33m 18s
    1. Creating a data project with SQL Project
      6m 24s
    2. Clarifying the confusion on .NET Data
      3m 31s
    3. Using ADO.NET in your application
      6m 50s
    4. Creating typed datasets
      7m 55s
    5. Using the data binding tools
      8m 38s
  9. 30m 13s
    1. Debugging code
      9m 32s
    2. Working with the Watch and other debug windows
      7m 46s
    3. Other debugging techniques
      6m 50s
    4. IntelliTrace historical debugging in Visual Studio Ultimate
      6m 5s
  10. 17m 56s
    1. Understanding Visual Studio editions and test tools
      2m 22s
    2. Verifying your code with unit tests
      8m 58s
    3. Running performance and load tests
      6m 36s
  11. 34m 5s
    1. Building your application
      4m 19s
    2. Customizing the build process with MSBuild
      6m 36s
    3. Setting assembly information
      2m 12s
    4. Deploying a basic Windows application
      2m 19s
    5. Creating an installer with Visual Studio
      7m 39s
    6. Creating a ClickOnce application
      5m 13s
    7. Setting up IIS for deploy
      2m 9s
    8. Deploying a Silverlight or ASP.NET application
      3m 38s
  12. 14m 0s
    1. Understanding source control
      2m 9s
    2. Setting up Team Foundation Server source control
      3m 5s
    3. Using Team Foundation Server source control
      8m 46s
  13. 17m 31s
    1. Understanding the .NET Office integration
      4m 16s
    2. Making a Word 2010 application
      7m 54s
    3. Making an Excel 2010 add-in
      5m 21s
  14. 31m 34s
    1. Understanding the extensibility model in Visual Studio
      2m 17s
    2. Adding external tools to the Tools menu
      4m 42s
    3. Creating macros
      7m 16s
    4. Using the Extension Manager
      5m 1s
    5. Creating an MEF add-in
      7m 9s
    6. Deploying and installing an add-in with VSIX
      5m 9s
  15. 25m 34s
    1. Working with configuration files
      5m 37s
    2. Using the Settings Editor
      7m 30s
    3. Using the Resources Editor
      6m 59s
    4. Localizing your resources
      5m 28s
  16. 1m 17s
    1. Goodbye
      1m 17s

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