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Microsoft Visual Studio 2010: A Beginner s Guide
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could end up saving bad data Since AddNewCustomer doesn t have an implementation, this is all speculation, but this outlines a few of the many problems that can occur if you allow your business objects to accept data that is bad for your program The macro demonstrated in this section will show how to check a string parameter for null, empty, or white space and throw an ArgumentNullException This will prevent callers from passing bad data and give them a meaningful message To create a macro, you will need to locate the position in the code where the macro starts (if applicable), start recording, perform VS actions, and stop recording It s somewhat like using a video recorder where you have to find a TV show, start the recording, allow the show to play, and then stop recording Perform the following steps to create the parameter validation macro:
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1 Click the firstName parameter of the AddNewCustomer method so that the cursor is
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inside of the firstName parameter identifier This is important because we need the parameter name in the code
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2 Start the macro recorder by selecting Tools | Macros | Record TemporaryMacro or press
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3 For C#, press CTRL-LEFT ARROW, CTRL-SHIFT-RIGHT ARROW, and CTRL-C For VB, press
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CTRL-LEFT ARROW, CTRL-SHIFT-RIGHT ARROW, SHIFT-LEFT ARROW,
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and CTRL-C This copies
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the parameter name
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4 For C#, press CTRL-F to bring up the Find And Replace window, type { into Find What,
click Find Next, Close the Find And Replace window, press END, and press ENTER For VB, press END and press ENTER This positions the cursor to begin entering code
5 Type if and press TAB twice (the if snippet), type stringIsNullOrWhiteSpace( into the
condition, press CTRL-V to paste the parameter name as the argument, and type ) For C#, press ENTER For VB, press DOWN ARROW The cursor moves to the body of the if statement (as you would expect with the if snippet) This sets up the validation check for the parameter, seeing if it is null (Nothing in VB), an empty string, or some white space character such as space or tab
6 Type throw new ArgumentNullException(", press CTRL-V to paste the parameter
name, type ", ", press CTRL-V to paste the parameter name, type a space, and type value is not valid") For C#, add a semicolon, ;, to the end of the line This is the action to perform when the value is not valid, throwing an exception to let the caller know that the value is not good
7 Press DOWN ARROW and press ENTER This positions the cursor after the code, which
might be convenient if you want to continue typing from this point
8 Select Tools | Macros | Stop Recording TemporaryMacro or press CTRL-SHIFT-R to stop
recording
12: Customizing the Development Environment
You ve now recorded a macro To check the preceding steps against what you ve produced, here s a revised AddNewCustomer method, showing what the results should look like: C#:
using System; class Customer { public int AddNewCustomer(string firstName, string lastName) { if (stringIsNullOrWhiteSpace(firstName)) { throw new ArgumentNullException( "firstName", "firstName value is not valid"); } int newCustID = 0; // Logic to add customer return newCustID; } }
Public Class Customer Function AddNewCustomer( ByVal firstName As String, ByVal lastName As String) As Integer If StringIsNullOrWhiteSpace(firstName) Then Throw New ArgumentNullException( "firstName", "firstName value is not valid") End If Dim newCustID As Integer = 0 ' Logic to add customer Return newCustID End Function End Class
Microsoft Visual Studio 2010: A Beginner s Guide
In the preceding code, I ve moved the ArgumentNullException arguments to separate lines to fit the book s line length, but this is what you should see Next, you can test the macro by running it Click the lastName parameter and select Tools | Macros | Run TemporaryMacro or press CTRL-SHIFT-P That will produce the following code:
public int AddNewCustomer(string firstName, string lastName) { if (stringIsNullOrWhiteSpace(lastName)) { throw new ArgumentException("lastName", "lastName value is not valid"); } if (stringIsNullOrWhiteSpace(firstName)) { throw new ArgumentException("firstName", "firstName value is not valid"); } int newCustID = 0; // Logic to add customer return newCustID; }
Now, you can run this macro on any of the string parameters of methods in your class and quickly add validation support The only problem at the present time is that the macro is overwritten as soon as you begin recording a new macro and the macro is gone if you close VS The next section addresses this problem by showing you how to save the macro
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