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2012-07-24T19:23:54.290
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You'll need to debug your template to find where the <code>NullReferenceException</code> is occurring. Tim Larson has quick overview <a href="http://adventuresindotnet.blogspot.com/2011/11/debugging-t4-templates.html" rel="nofollow noreferrer">here</a> and Oleg Sych has a more details <a href="http://www.olegsych.com/2008/09/t4-tutorial-debugging-code-generation-files/" rel="nofollow noreferrer">here</a>, along with his other excellent blog entries on T4. Here's the short-short version: <ol> <li>Add debug="true" to template directive: <code><#@ template debug="true" #></code></li> <li>Launch debugger <code>System.Diagnostics.Debugger.Launch();</code></li> <li>Break <code>System.Diagnostics.Debugger.Break();</code></li> <li>Select New instance of Microsoft Visual Studio in Visual Studio Just-In-Time Debugger dialog and click Yes</li> <li>Debug your T4 template</li> </ol> Here is a simple example to help catch the <code>NullReferenceException</code> when calling ToString on bar: <pre><code><#@ template debug="true" language="C#" #> <#@ output extension=".txt" #> <# System.Diagnostics.Debugger.Launch(); System.Diagnostics.Debugger.Break(); object bar = null; #> foo<#= bar.ToString() #> </code></pre> Be sure to check first link though since on some versions you'll need to update the registry key <code>HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\DbgJITDebugLaunchSetting</code> to <code>0x2</code> to get things to behave correctly.
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