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POHelp System.Web.Compilation.BuildManager find a type in a non-referenced assembly
 

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  1. POHelp System.Web.Compilation.BuildManager find a type in a non-referenced assembly
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    <p>I'm trying to write a plug-in system where assemblies can be dropped in a folder that ASP.NET has no knowledge about. This plug-in system works fine for ASP.NET MVC based assemblies, but for old-school WebForm assemblies (where the <code>.aspx</code> files <code>Inherits</code> the <code>System.Web.UI.Page</code> derived classes) <code>System.Web.Compilation.BuildManager</code> is responsible for compiling the <code>.aspx</code> file into a dynamic assembly.</p> <p>My problem is that the <code>BuildManager</code> knows nothing about the assemblies within my plug-in folder and it seems to be absolutely nothing I can do to help it. If I do:</p> <pre><code>BuildManager.GetType("PluginAssembly.DefinedType", true, true) </code></pre> <p>it throws. If I first get a reference to the <code>Type</code> and then try:</p> <pre><code>var instance = BuildManager.CreateInstanceFromVirtualPath(path, type); </code></pre> <p>it still throws, even though I've now passed in the specific <code>type</code> it needs to compile the <code>.aspx</code> file. Is there anything I can do to help <code>BuildManager</code> find the types it needs to compile the <code>.aspx</code> file?</p> <p><strong>Update:</strong> I've come one step further, by looking into what <code>BuildManager.GetType()</code> actually does. By specifying the assembly the type is defined in (such as "PluginAssembly.DefinedType, PluginAssembly") and then hooking myself onto the <code>System.AppDomain.CurrentDomain.AssemblyResolve</code> event, I can now find the plug-in assembly and return it so BuildManager can successfully construct the type. This makes the following work with flying colors:</p> <pre><code>BuildManager.GetType("PluginAssembly.DefinedType, PluginAssembly", true, true) </code></pre> <p>However, this still fails:</p> <pre><code>var instance = BuildManager.CreateInstanceFromVirtualPath(path, type); </code></pre> <p>Even though the <code>.aspx</code> file now has the same assembly reference in its <code>Inherits</code> directive:</p> <pre><code>&lt;%@ Page Language="C#" CodeBehind="Index.aspx.cs" Inherits="PluginAssembly.DefinedType, PluginAssembly" %&gt; </code></pre> <p>The error I receive is:</p> <p>"Compiler Error Message: CS0234: The type or namespace name 'DefinedType' does not exist in the namespace 'PluginAssembly' (are you missing an assembly reference?)" with the following source output:</p> <pre><code>Line 205: Line 206: [System.Runtime.CompilerServices.CompilerGlobalScopeAttribute()] Line 207: public class plugins_pluginassembly_dll_index_aspx : global::PluginAssembly.DefinedType, System.Web.SessionState.IRequiresSessionState, System.Web.IHttpHandler { Line 208: Line 209: private static bool @__initialized; </code></pre> <p>It seems like what happens inside <code>BuildManager.CreateInstanceFromVirtualPath()</code> involves a certain <code>System.Web.Util.IWebObjectFactory</code> that it might be responsible for throwing this exception by not finding my assembly. I can implement this interface without any problems, but what does that help if I can't tell the <code>BuildManager</code> about it?</p>
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      1. POHelp System.Web.Compilation.BuildManager find a type in a non-referenced assembly
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      1. POHelp System.Web.Compilation.BuildManager find a type in a non-referenced assembly
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    1. COWhat's the problem with having to recycle your application when you add plug-ins?
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    2. COBecause it will require taking down the whole website just to refresh one plug-in. Also, it probably won't work in medium trust and is imho a really poor solution.
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      1. USAsbjørn Ulsberg
    3. CONote the answer you are looking for but have you tried MEF? http://blogs.msdn.com/hammett/archive/2009/04/23/mef-and-asp-net-mvc-sample.aspx
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