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Refactoring your code

From: Visual Studio 2010 Essential Training

Video: Refactoring your code

Writing code is a constant push and pull on your development skills. First, you write some code and test it to see if it works the way you intended. Then as the project progresses, you think about ways to improve and change the code. Some people call this rewriting refactoring. Regardless of how you define it, Visual Studio has refactoring tools to help. If you are a C# developer, then you don't have to do anything special, as there are about 10 refactoring tools built into Visual Studio. If you are a Visual Basic programmer, you should download the free CodeRush Xpress tool, which provides dramatic code refactoring support.

Refactoring your code

Writing code is a constant push and pull on your development skills. First, you write some code and test it to see if it works the way you intended. Then as the project progresses, you think about ways to improve and change the code. Some people call this rewriting refactoring. Regardless of how you define it, Visual Studio has refactoring tools to help. If you are a C# developer, then you don't have to do anything special, as there are about 10 refactoring tools built into Visual Studio. If you are a Visual Basic programmer, you should download the free CodeRush Xpress tool, which provides dramatic code refactoring support.

I'm inside Visual Studio, and I've opened the RefactorYourCode Solution, which contains a C# and a Visual Basic project. I will start my refactoring journey by going to Program.cs. A common refactoring is when you need to rename something. I am going to rename this variable. So I will put my cursor on the variable, and I will right-click and choose Refactor. Then I will choose Rename. Also note the keystrokes Ctrl+R, Ctrl+R. Now during this refactoring, a dialog box will appear.

I can type in my new variable name, and then I can choose to preview the changes inside the dialog. I can also choose where to search for this word. I am going to click OK. Here's my preview screen. It shows that it's going to change line 13. It's a little bit harder to see, but it shows it's also going to change line 18. These changes look good to me, so I am going to click the Apply button, and I successfully changed those two lines of code. Next, I want to save the method name. So I'll click on the save book, which I am using twice. I am using it on line 21 and on line 18.

I am going to click here and use the keystrokes Ctrl+R, Ctrl+R. Make a slight change. Call this SaveTheBook. Again, choose to preview reference changes, and it shows in my preview screen several places where this code is going to be updated. I can click through these different elements up here to look. I'll click on Apply. And if I look in the Book.cs file, I also see that it changed it successfully over here. Next, I want to go to the MathLib file and show you the Extract Method Refactor.

I look at this code, and I'm thinking, "I want to reuse this in my application. It shouldn't live in entirely inside this CalculatePaintNeeded Method." So what I can do is come over here, choose Refactor > Extract Method. I'll get the dialog box again, and I think the new name should be called CalcArea, and as you can see Visual Studio wrote a new function for me, copied my code down there to line 24, and then changed my code on line 17 to call that method and pass in the necessary information that's needed for this function.

Next, I am going to switch back to the Book and show you the reorder parameter function. I have three parameters here. We decided on our team that this first string variable belongs at the end. So what I do is I put my cursor on SaveTheBook, choose the Refactor menu, and then choose this one, Reorder Parameters. Another dialog crops up. It shows the three parameters. I am going to pick this first parameter and then the down arrow, click on it twice to move it to the end of the parameter list. I feel good about not previewing my changes, so I am going to click on OK, and now you see the parameter has moved to the third position.

Now this a bit tricky, because I'm calling this function from a couple of areas in my code--calling it over here in Program.cs--so let's verify that it changed correctly over there. Yes it did, look on line 18. File path is now the last argument, and this string down here is also the last argument. My last refactoring for C# is going to be Extract Interface. That's a common refactoring pattern. I am going to go to this Book class, and I want to take these two properties, title and price, and I want to pull them out of the class and put them in a common interface. So I will choose the Book class, invoke the Refactor menu, choose Extract Interface, and then look at this interface name and see if it meets my requirements.

I like IBook. Next, I come down, and I choose the two properties. I want to leave the method inside the class and then click OK. Visual Studio creates a brand-new file over here--IBook.cs--extracts my interface and then correctly fixes up my code in the Book class to implement that interface. If you are a Visual Basic programmer, you don't have refactoring in Visual Studio by default. The good news is if you like what you see in Express, it's also available for C# programmers. If you plan on following along with me in this demo, you need to install the Express tools.

I've included those in the Installers folder inside your Exercise Files folder. So you go to Installers and then run this Express Installer. When I ran Visual Studio the next time after installing DevExpress, it asked me how you would like to run DevExpress, and I told it to let me load it manually when I start up the application. So I am going to go to this menu, DevExpress, and pick Load. And immediately you will see some changes in my C# code. It's now drawing a red line between my curly braces and other colored lines between like my if statements here.

It will also do the same thing over in my vb code. There are more refactoring tools in Visual Studio. I have only shown a few of them in this movie. If you like Visual Basic, then check out the VB refactoring title in this chapter.

Show transcript

This video is part of

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

86 video lessons · 30439 viewers

Walt Ritscher
Author

 
Expand all | Collapse all
  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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