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POUnable to load a generic type into another AppDomain in ASP.NET Application
 

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  1. POUnable to load a generic type into another AppDomain in ASP.NET Application
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    <p>I have a very odd problem where I am unable to load a generic type into another AppDomain when running inside of ASP.NET, but it works in my Test project and a Console app.</p> <p>The relevant code does essentially this:</p> <pre><code>Assembly ass = Assembly.GetExecutingAssembly(); string AssemblyPath = ass.Location; var templateType = typeof(RazorEngine&lt;RazorTemplateBase&gt;); object instance = LocalAppDomain.CreateInstanceFrom(AssemblyPath, templateType.FullName) .Unwrap(); </code></pre> <p>The code bombs on the last line. The AppDomain exists and its base execution and bin paths are matched to the original AppDomain.</p> <p>When running through this code in a test project, it works fine. The instance is created (as a TransparentProxy remoting reference) and all is well.</p> <p>When running in ASP.NET I get a type error on the generic type parameter:</p> <blockquote> <p>GenericArguments[0], 'Westwind.RazorHosting.RazorTemplateBase', on 'Westwind.RazorHosting.RazorEngine`1[TBaseTemplateType]' violates the constraint of type 'TBaseTemplateType'.</p> </blockquote> <p>where TBaseTemplateType is the same type passed in (ie. RazorTemplateBase) with RazorEngine defined like this:</p> <pre><code>public class RazorEngine&lt;TBaseTemplateType&gt; : MarshalByRefObject where TBaseTemplateType : RazorTemplateBase </code></pre> <p>Clearly I'm passing the right type since it is the actual restraining type, but somehow the AppDomain is not recognizing the Generic type as the same.</p> <p>As I mentioned it works inside of a Windows application and a test project, but inside of ASP.NET the generic type won't instantiate across AppDomain boundaries. Using the same code to create a non-generic type (even the same non-generic version of this type RazorHosting that inherits from RazorHosting) and it works fine.</p> <p>Stumped. What could ASP.NET be doing to make this behave so differently than when running in a test project?</p>
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    1. USRick Strahl
    1. USRick Strahl
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      1. USSergey Mirvoda
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    1. COI think Russel is right. This is probably a shadow copying issue. Try to replace AssemblyPath with templateType.Assembly.Location.
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      1. USPanos Rontogiannis
 

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