Using T4 templates in Entity framework

Introduction:
T4 stands for Text template transformation toolkit which is a template-based code generation engine built into Visual Studio. It is available in Visual studio from Visual Studio 2008 and higher version of Visual Studio. T4 engine allows you to generate C#, T-SQL, XML or any other text files by using ASP.NET – ASPX template like syntax. T4 template has .tt extension.

For example, TextTemplate.tt T4 template has the following code:

    <#@ template language="C#" #>
    <#@ assembly name="System.Core" #>
    <#@ import namespace="System.Text" #>
    <#@ output extension=".txt" #>
    <# Write("T4 templates with EF!"); #>

The T4 template processor will transform above T4 template code into a text file having extension .txt by executing the code and processing directives inside.

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T4 templates with EF!

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T4 templates with Entity framework
T4 templates in entity framework are used to generate C# or VB entity classes from EDMX files. Visual Studio 2013 or 2012 provides two templates- EntityObject Generator and DBContext Generator for creating C# or VB entity classes. The additional templates are also available for download.

To use one of these templates, right-click on the design surface of an .edmx file and select the "Add Code Generation Item".


Selecting the command will launch a dialog box allowing you to select one of the installed code-generation items, or to search for new items online.