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    <p>From the problem description in your question I can see there are really 2 primary tasks that you are trying to accomplish:</p> <p>1) Determine if a given assembly name can be loaded from the GAC.<br/> 2) Return the file modified date for the given assembly.</p> <p>I believe these 2 points can be accomplished in a much simpler fashion and without having to work with the <a href="http://msdn.microsoft.com/en-us/library/ms404523.aspx" rel="nofollow">unmanaged fusion API</a>. An easier way to go about this task might be as follows:</p> <pre><code>static void Main(string[] args) { // Run the method with a few test values GetAssemblyDetail("System.Data"); // This should be in the GAC GetAssemblyDetail("YourAssemblyName"); // This might be in the GAC GetAssemblyDetail("ImaginaryAssembly"); // This just plain doesn't exist } private static DateTime? GetAssemblyDetail(string assemblyName) { Assembly a; a = Assembly.LoadWithPartialName(assemblyName); if (a != null) { Console.WriteLine("'{0}' is in GAC? {1}", assemblyName, a.GlobalAssemblyCache); FileInfo fi = new FileInfo(a.Location); Console.WriteLine("'{0}' Modified: {1}", assemblyName, fi.LastWriteTime); return fi.LastWriteTime; } else { Console.WriteLine("Assembly '{0}' not found", assemblyName); return null; } } </code></pre> <p>An example of the resulting output:</p> <blockquote> <p>'System.Data' is in GAC? True<br/> 'System.Data' Modified: 10/1/2010 9:32:27 AM<br/> 'YourAssemblyName' is in GAC? False<br/> 'YourAssemblyName' Modified: 12/30/2010 4:25:08 AM<br/> Assembly 'ImaginaryAssembly' not found<br/></p> </blockquote>
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    1. POGetting the Last Modified Date of an assembly in the GAC
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    1. USSaul Dolgin
    1. USSaul Dolgin
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    1. POGetting the Last Modified Date of an assembly in the GAC
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    1. COThanks - works well but what about multiple versions?
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      1. USDavid
    2. COThe GAC COM APIs are not undocumented. See http://msdn.microsoft.com/en-us/library/ms404523.aspx
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      1. USMattias S
    3. COThanks for pointing out the documentation for the fusion API, Mattias. I wasn't aware of this and have updated my answer summary to reflect that it is, in fact, documented.
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