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copied!<p>You can embed the unmanaged DLL as a resource if you extract it yourself to a temporary directory during initialization, and load it explicitly with LoadLibrary before using P/Invoke. I have used this technique and it works well. You may prefer to just link it to the assembly as a separate file as Michael noted, but having it all in one file has its advantages. Here's the approach I used:</p> <pre><code>// Get a temporary directory in which we can store the unmanaged DLL, with // this assembly's version number in the path in order to avoid version // conflicts in case two applications are running at once with different versions string dirName = Path.Combine(Path.GetTempPath(), "MyAssembly." + Assembly.GetExecutingAssembly().GetName().Version.ToString()); if (!Directory.Exists(dirName)) Directory.CreateDirectory(dirName); string dllPath = Path.Combine(dirName, "MyAssembly.Unmanaged.dll"); // Get the embedded resource stream that holds the Internal DLL in this assembly. // The name looks funny because it must be the default namespace of this project // (MyAssembly.) plus the name of the Properties subdirectory where the // embedded resource resides (Properties.) plus the name of the file. using (Stream stm = Assembly.GetExecutingAssembly().GetManifestResourceStream( "MyAssembly.Properties.MyAssembly.Unmanaged.dll")) { // Copy the assembly to the temporary file try { using (Stream outFile = File.Create(dllPath)) { const int sz = 4096; byte[] buf = new byte[sz]; while (true) { int nRead = stm.Read(buf, 0, sz); if (nRead < 1) break; outFile.Write(buf, 0, nRead); } } } catch { // This may happen if another process has already created and loaded the file. // Since the directory includes the version number of this assembly we can // assume that it's the same bits, so we just ignore the excecption here and // load the DLL. } } // We must explicitly load the DLL here because the temporary directory // is not in the PATH. // Once it is loaded, the DllImport directives that use the DLL will use // the one that is already loaded into the process. IntPtr h = LoadLibrary(dllPath); Debug.Assert(h != IntPtr.Zero, "Unable to load library " + dllPath); </code></pre>

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