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    <p>Here is my solution, which is a modified version of JayMcClellan's answer. Save the file below into a class.cs file.</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; using System.IO; using System.Reflection; using System.Diagnostics; using System.ComponentModel; namespace Qromodyn { /// &lt;summary&gt; /// A class used by managed classes to managed unmanaged DLLs. /// This will extract and load DLLs from embedded binary resources. /// /// This can be used with pinvoke, as well as manually loading DLLs your own way. If you use pinvoke, you don't need to load the DLLs, just /// extract them. When the DLLs are extracted, the %PATH% environment variable is updated to point to the temporary folder. /// /// To Use /// &lt;list type=""&gt; /// &lt;item&gt;Add all of the DLLs as binary file resources to the project Propeties. Double click Properties/Resources.resx, /// Add Resource, Add Existing File. The resource name will be similar but not exactly the same as the DLL file name.&lt;/item&gt; /// &lt;item&gt;In a static constructor of your application, call EmbeddedDllClass.ExtractEmbeddedDlls() for each DLL that is needed&lt;/item&gt; /// &lt;example&gt; /// EmbeddedDllClass.ExtractEmbeddedDlls("libFrontPanel-pinv.dll", Properties.Resources.libFrontPanel_pinv); /// &lt;/example&gt; /// &lt;item&gt;Optional: In a static constructor of your application, call EmbeddedDllClass.LoadDll() to load the DLLs you have extracted. This is not necessary for pinvoke&lt;/item&gt; /// &lt;example&gt; /// EmbeddedDllClass.LoadDll("myscrewball.dll"); /// &lt;/example&gt; /// &lt;item&gt;Continue using standard Pinvoke methods for the desired functions in the DLL&lt;/item&gt; /// &lt;/list&gt; /// &lt;/summary&gt; public class EmbeddedDllClass { private static string tempFolder = ""; /// &lt;summary&gt; /// Extract DLLs from resources to temporary folder /// &lt;/summary&gt; /// &lt;param name="dllName"&gt;name of DLL file to create (including dll suffix)&lt;/param&gt; /// &lt;param name="resourceBytes"&gt;The resource name (fully qualified)&lt;/param&gt; public static void ExtractEmbeddedDlls(string dllName, byte[] resourceBytes) { Assembly assem = Assembly.GetExecutingAssembly(); string[] names = assem.GetManifestResourceNames(); AssemblyName an = assem.GetName(); // The temporary folder holds one or more of the temporary DLLs // It is made "unique" to avoid different versions of the DLL or architectures. tempFolder = String.Format("{0}.{1}.{2}", an.Name, an.ProcessorArchitecture, an.Version); string dirName = Path.Combine(Path.GetTempPath(), tempFolder); if (!Directory.Exists(dirName)) { Directory.CreateDirectory(dirName); } // Add the temporary dirName to the PATH environment variable (at the head!) string path = Environment.GetEnvironmentVariable("PATH"); string[] pathPieces = path.Split(';'); bool found = false; foreach (string pathPiece in pathPieces) { if (pathPiece == dirName) { found = true; break; } } if (!found) { Environment.SetEnvironmentVariable("PATH", dirName + ";" + path); } // See if the file exists, avoid rewriting it if not necessary string dllPath = Path.Combine(dirName, dllName); bool rewrite = true; if (File.Exists(dllPath)) { byte[] existing = File.ReadAllBytes(dllPath); if (resourceBytes.SequenceEqual(existing)) { rewrite = false; } } if (rewrite) { File.WriteAllBytes(dllPath, resourceBytes); } } [DllImport("kernel32", SetLastError = true, CharSet = CharSet.Unicode)] static extern IntPtr LoadLibrary(string lpFileName); /// &lt;summary&gt; /// managed wrapper around LoadLibrary /// &lt;/summary&gt; /// &lt;param name="dllName"&gt;&lt;/param&gt; static public void LoadDll(string dllName) { if (tempFolder == "") { throw new Exception("Please call ExtractEmbeddedDlls before LoadDll"); } IntPtr h = LoadLibrary(dllName); if (h == IntPtr.Zero) { Exception e = new Win32Exception(); throw new DllNotFoundException("Unable to load library: " + dllName + " from " + tempFolder, e); } } } } </code></pre>
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    1. POEmbedding unmanaged dll into a managed C# dll
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    1. COMark, this is really cool. For my uses, I found I could remove the LoadDll() method, and call LoadLibrary() at the end of ExtractEmbeddedDlls(). This also allowed me to remove the PATH modifying code.
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