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and EndErrorSession(), and any non-unique error messages will be skipped; this is a very handy feature, because errors in repeatedly applied templates tend to lead to a lot of confusing duplicate messages In this example, the text for the template is being stored in a resx resource le and is retrieved using Visual Studio s strongly typed resource wrapper mechanism It could equally be stored on disk somewhere under your DSL s installation directory and loaded as required The template being loaded here has the following content:
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<#@ template inherits="MicrosoftVisualStudioTextTemplatingVSHost ModelingTextTransformation" debug="true"#> <#@ output extension="cs" #> <#@ GenClass processor="GenClassDirectiveProcessor" requires="fileName='@@MODELFILE@@';name='@@CLASSNAME@@'" #> namespace ClassGenOutput { public class <#= thisModelClassName #> <#= thisModelClassSuperclass != null " : " + thisModelClassSuperclassName : "" #> { #region Members <# foreach (ModelAttribute attribute in thisModelClassAttributes) { #> private <#= attributeType #> <#=attributeName #>; <# } #> #endregion #region Operations <# foreach (ClassOperation operation in thisModelClassOperations) { #> public void <#=operationName #> (<#= operationSignature #>) { } <# } #> #endregion } }
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This is a fairly standard text template that simply writes out a basic skeleton for a C# class making the assumption that it has the reference to the class as a member of the template in its ModelClass property The item to note is the GenClass custom directive, which has two requires parameters with odd-looking tokens supplied as values Going back to the command code, the next actions are to create a directory to generate code into, start an error session to avoid duplicate errors, and loop over each ModelClass found in the model of the current document Having got an individual ModelClass, the code then replaces the tokens in a copy of the template text with the lename of the current document and the name of the ModelClass The templating service is then called to process this individualized template, and the output is written to an appropriate le Finally, the le is added to the Visual Studio project; in a more complete implementation, the DTE API should be used to ensure that source code control is integrated into this scenario, checking out the le if necessary before generation The trick of doing a token replacement on the template text has provided an individual directive specifying a ModelClass by name for each call to the templating service, but one nal piece is still needed to connect that up to the ModelClass property on the template To achieve this, the custom directive processor in the solution is amended to take an extra requires parameter, name and to provide the ModelClass property The implementation for the extra code contributed by this directive processor simply searches the loaded model for a ModelClass instance whose Name domain property matches the passed-in name parameter and sets the backing store for the property accordingly Here s the code that declares the property and its backing store:
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protected override void GenerateTransformCode( string directiveName, StringBuilder codeBuffer, CodeDomProvider languageProvider, IDictionary<string, string> requiresArguments, IDictionary<string, string> providesArguments) { baseGenerateTransformCode(directiveName, codeBuffer, languageProvider, requiresArguments, providesArguments);
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// TODO: This would be better done using CodeDOM in a production // designer in order to support Visual Basic // Add ModelClass property's backing store codeBufferAppendLine("private ModelClass _" + providesArguments["ModelClass"] + ";"); // Add ModelClass property codeBufferAppendLine("public ModelClass " + providesArguments["ModelClass"] + "{ get { return _" + providesArguments["ModelClass"] + " ; } }"); }
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Although this isn t the easiest code to read, you can see that the providesArguments dictionary is being used to specify the name of both the property and its backing store This allows the directive to be used more than once in a single template without name clashes Finally, here s the code that initializes the backing store:
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protected override void GeneratePostInitializationCode( string directiveName, StringBuilder codeBuffer, CodeDomProvider languageProvider, IDictionary<string, string> requiresArguments, IDictionary<string, string> providesArguments) { baseGeneratePostInitializationCode(directiveName, codeBuffer, languageProvider, requiresArguments, providesArguments); // Initialize the ModelClass property codeBufferAppendLine(@"foreach (ModelClass eachClass in thisStoreElementDirectoryFindElements<ModelClass>())"); codeBufferAppendLine(@"{"); codeBufferAppendLine(@" if (StringComparerOrdinal Compare(eachClassName, """ + requiresArguments["name"] + @""") == 0)"); codeBufferAppendLine(@" {"); codeBufferAppendLine(@" this_" + providesArguments["ModelClass"] + " = eachClass;"); codeBufferAppendLine(@" break;"); codeBufferAppendLine(@" }"); codeBufferAppendLine(@"}"); }
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