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copied!<p><strong>UPDATE:</strong></p> <p>A technically unsupported but working solution is to p/Invoke LoadLibrary and specifically load the correct DLL early in the process. All managed and p/Invoke'd libraries are loaded "as needed". The CLR will load them for you when you invoke a method that depends on one of the types in that assembly (note: this is the "unsupported" part; this is <em>not</em> documented and may change in a future CLR version).</p> <p>The approach works because if an assembly is loaded via <code>LoadLibrary</code>, it's "found" by the CLR loader and the runtime will not attempt to load it again. We used this trick on CF to pre-load assemblies before doing much memory allocation to avoid out-of-memory situations.</p> <p>So, you should be able to do:</p> <pre><code>public static void Main() { LoadCorrectDLLs(); // .NET will ensure DotNetZip is loaded at this point. MethodInThisAssembly(); } public static void MethodInThisAssembly() { // Since MethodInThisAssembly uses DotNetZip, // its assembly will get loaded immediately before this method is called. IDotNetZipInterface x = null; ... } public static void LoadCorrectDLLs() { // p/Invoke LoadLibrary to load the correct version of DotNetZip. } </code></pre> <p>Note that the following will <em>not</em> work:</p> <pre><code>public static void Main() { LoadCorrectDLLs(); // This line would force DotNetZip to get loaded before Main() is called IDotNetZipInterface x = null; } </code></pre> <p><strong>Old answer; works on desktop framework only:</strong></p> <p>One trick is to place them in directories that won't be found during DLL loading (e.g., different subdirectories of your executable's directory) and handle <a href="http://msdn.microsoft.com/en-us/library/system.appdomain.assemblyresolve.aspx" rel="nofollow noreferrer">AppDomain.AssemblyResove</a>. David Morton has a decent write-up <a href="http://blog.codinglight.com/2009/07/assembly-resolution-with.html" rel="nofollow noreferrer">on his blog</a>.</p>

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