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Using the code example from the preceding section, replace the hardcoded message text string with the string from the resource le:
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If MeActiveMdiChild Is Nothing Then eCancel = True MessageBoxShow(MyResourcesPrintErrActiveForm) Else PTPrintDocumentPrint() End If
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In addition to message strings, you can use this technique to put any strings from your application into the application resource le You can make the resource strings more general by using composite formatting Composite formatting enables you to de ne a text string that contains indexed placeholders, de ned with {0}, {1} and so on When you use that string, you then de ne the ordered values for those placeholders The result is a string consisting of the original text intermixed with the formatted values You can use composite formatting with NET Framework methods such as StringFormat, ConsoleWriteLine, and DebugPrint For example, say you want to validate that several of the elds on the form are required You could create a string resource to say Product Name is required, please enter a valid string and another that says Product Number is required, please enter a valid number and so on It may be more ef cient to add one generalized string to the resource le that says {0} is required, please enter a valid {1} To use the generalized resource le string, call the StringFormat method and de ne the string and the ordered values to ll the placeholders:
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MessageBoxShow(StringFormat(MyResourcesValidationRequired, _ "Product Name", "string"))
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The rst parameter to the Format method is the string, in this case the resource le string name The second parameter is the replacement
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for the {0} placeholder, the third parameter is the replacement for the {1} placeholder, and so on in an ordered fashion The resulting string appears as Product Name is required, please enter a valid string
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NOTE: Take care when using this technique with resource files that are localized, because any replacement strings hard-coded in your application also need to be localized
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4 BUILDING THE USER INTERFACE LAYER
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Using a resource le for your strings makes it easier to maintain and manage the strings separate from your application And leveraging the new MyResources object makes it easy to reference the strings using strongly typed names
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For the Purchase Tracker sample application: Select the Windows Application project (PTWin) in Solution Explorer Open the Project Designer and select the Resources tab Add a ValidationRequired resource string to the Resources tab Set the text to {0} is required, please enter a valid value Optionally, add code to the Load event of the ProductWin form to display a message containing the ValidationRequired resource string:
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MessageBoxShow(StringFormat(_ MyResourcesValidationRequired, "Product Name"))
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If you implemented printing in the Purchase Tracker application, also add the PrintErrActiveForm resource string as defined in this section It will be used in the next Building Along activity Run the application It displays your splash screen and then shows the MDI parent form Select Products | Manage Products to display the ProductWin form If you added a message box, it appears before the ProductWin form is displayed After trying this, remove the message box The resource string is used for validation in 7
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Using defensive development techniques and displaying a message to the user when there is a problem is a great way to handle expected exceptions, especially when the user can do something to correct the problem But in many cases it is not appropriate to display a message to the user In these cases, throwing exceptions may be a better option As an example, look again at the code de ned earlier in this chapter to support printing This is not code that you want to write for every application you build Instead, you write it once and put it into a class library that you can then reuse in every application But code in a class library should never display messages to the user The code instead needs to notify the calling code if it has a problem and allow the calling code to de ne how to respond to the problem When a problem exists, there are several ways a method can notify the code that called it:
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Return an error code A common C programming language convention was to always return an error code from every method The calling code could then check the return code to determine if an error occurred The problem with this technique is that it requires that the calling code always remember to check the return value This was a common programming mistake in many C applications Another problem is that it then prevented returning a more logical object from the method and instead required passing the return values as parameters This technique is not used much anymore because of these drawbacks Throw an exception Throwing an exception is the NET way for a method to notify its calling code of any problems
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You can throw one of the many prede ned exceptions available in the NET Framework, or you can create your own exception classes See 5 for more information on creating your own exception classes To throw a NET Framework exception: 1 Use defensive development techniques to determine which code should throw an exception