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Editorial Team
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Asked: 2026-05-25T06:28:03+00:00

I need to load all the assemblies from DLLs in a directory. My basic

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I need to load all the assemblies from DLLs in a directory.

My basic code is:

var assemblies = from filename in Directory.GetFiles(HttpRuntime.BinDirectory, "*.dll")
                 select Assembly.LoadFrom(filename);

However, if there are unmanaged DLLs in that directory then Assembly.LoadFrom fails. Is there a good way to only load the managed DLLs? Catching the load exception is an option, but I’d like to know if there’s a better way.

My code runs on ASP.NET, at application start up. So I’ll also accept an ASP.NET specific solution.

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1 Answer

  1. Editorial Team

    from here: http://blogs.msdn.com/b/junfeng/archive/2004/02/06/68334.aspx

    “Assembly.LoadFrom will throw BadImageFormatException if the given file is not a managed assembly.

    This exception could be thrown for other reason as well. Suzanne kindly points out a more robust way. Once you catch the BadImageFormatException, look at its HResult field. If HResult is COR_E_ASSEMBLYEXPECTED, it means this is not a managed assembly.”

    Does that help?

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