This is consistent with how popular packages are now injecting. If you are using Azure or another cloud provider then please note that they generally provide a cloud-specific approach to storing per-environment settings.
You may not need to use config transforms anymore. There are plusses and minuses to transforms. On the plus side you can ensure at build time that everything is transforming correctly. On the negative side you are exposing your settings to all your developers.
If you are building. The configuration system in. NET Core allows you to have per-environment settings files that override specific settings in the base file. The base change that will be made is that the. The need for a VS extension at build time has to be eliminated. The original solution has several components: item template, config transform files and.
The config transform files containing the transformation rules remain unchanged. You can continue to use them as is. The item template needs to be adjusted to handle the move from an extension-specific. This is a minor change. At the same time we can update the file to rely on a pre-build assembly that contains the transformation logic. This helps resolve issues with trying to get MSBuild to load an assembly from an inline task like we had in previous versions of the extension.
To get started we need to create a new class library to hold the transformation task the. Edit the project file or update it via the UI. The original version of the code used the Microsoft. TransformXml task from Microsoft. But this assembly is not shipped in NuGet so we have switched to Microsoft. This required some changes to the TransformXmlFiles task to use the new type. Here are the highlights, the code has the full version. Read a file in the text template. This is simplest way to get data into the template:.
Load a file as a navigable model. A more powerful method is to read the data as a model, which your text template code can navigate. You could also use xsd. Edit the model file in a diagram or form. Domain-Specific Language Tools provides tools that let you edit a model as a diagram or Windows form.
This makes it easier to discuss the model with users of the generated application. Domain-Specific Language Tools also creates a set of strongly-typed classes that reflect the structure of the model.
In a design-time text template , if you want to reference a file in a location relative to the text template, use this. You can also obtain other services that are provided by the host.
You should be aware that a design-time text template runs in an AppDomain that is separate from the main application. In most cases this is not important, but you might discover restrictions in certain complex cases. For example, if you want to pass data in or out of the template from a separate service, then the service must provide a serializable API. This isn't true of a run-time text template , which provides code that is compiled along with the rest of your code.
Specialized text template editors can be downloaded from the Extension Manager Online Gallery. On the Tools menu, click Extension Manager. Click Online Gallery , and then use the search tool. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No.
Any additional feedback? Submit and view feedback for This product This page. View all page feedback. In this article. Guidelines for Writing T4 Text Templates. Text Template Structure. Call those methods from the template. In this way, the template shows more clearly what the target output string will look like. Discussions about the appearance of the result can be separated from the logic of creating the data that it displays.
If you want your template code to reference a. NET or other assembly such as System. If you want to import a namespace in the same way as a using statement, you can do this with the import directive:. If you have text that is shared between several templates, you can place it in a separate file and include it in each file in which it should appear:.
The included content can contain any mixture of program code and plain text, and it can contain other include directives and other directives. The include directive can be used anywhere within the text of a template file or an included file. You can share content between run-time templates by writing a base class template, which can be abstract. The base class contains no free text. Instead, all of its text blocks occur inside the class feature methods.
The application calls the TextTransform method of the derived class, but does not transform the base class SharedFragments. Both the base and derived classes are runtime text templates; that is, the Custom Tool property is set to TextTemplatingFilePreprocessor. In this alternative approach to using template inheritance, the bulk of the text is defined in the base template.
The derived templates provide data and text fragments that fit into the base content. Design-time templates: If you want to use a template to generate code that becomes part of your application, see Design-Time Code Generation by using T4 Text Templates.
Run-time templates can be used in any application where the templates and their content are determined at compile time. But if you want to write a Visual Studio extension that generates text from templates that change at run time, see Invoking Text Transformation in a VS Extension. Skip to main content. This browser is no longer supported.
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