Post

GrapeVine Voice: Issue 4 Revisited Once More

This post talks about the changes in 6.0 Update 1.

This is an interesting issue because it touches one of the .NET essentials, PE format. So even though I talked about it in this post earlier, I think another post is worthwhile.

Yes, using the sample code in last post I was able to determine if a file is .NET assembly but it was not efficient. Because of a well known .NET bug that assemblies loaded by reflection cannot be unloaded easily. Thus, if you try to verify a thousand files, then you may waste a lot of memory unexpectedly.

It is quite lucky that today NDepend author Patrick Smacchia talked about a similar topic here. Suddenly I realize that I should drop System.Reflection and try Mono.Cecil instead.

http://codebetter.com/blogs/patricksmacchia/archive/2008/03/18/mono-cecil-vs-system-reflection.aspx

So right now I use this sample code in 6.0 Update 1 RC,

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public static bool IsDotNetAssembly(string fileName)
{
    bool result = true;
    Mono.Cecil.AssemblyDefinition myLibrary = null;
    try
    {
        myLibrary = Mono.Cecil.AssemblyFactory.GetAssembly (fileName);
    }
    catch (Mono.Cecil.Binary.ImageFormatException)
    {
        // for win32 dll
        result = false;
    }
    catch (ArgumentOutOfRangeException)
    {
        // for win32 exe
        result = false;
    }

    return result && myLibrary != null;
}
© Lex Li. All rights reserved. The code included is licensed under CC BY 4.0 unless otherwise noted.
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Last updated on October 03, 2024