Automate the Manifest Injection Process

using System;
using System.IO;
using System.Runtime.InteropServices;

namespace ThemeControl
{
	public class ManifestInjection
	{
		[DllImport("kernel32.dll", SetLastError=true)] 
		static extern int BeginUpdateResource(string pFileName, bool bDeleteExistingResources);

		[DllImport("kernel32.dll", SetLastError=true)] 
		static extern int EndUpdateResource(IntPtr hUpdate, bool fDiscard);

		[DllImport("kernel32.dll", SetLastError=true)] 
		static extern int UpdateResource(IntPtr hUpdate, uint lpType, uint lpName, ushort wLanguage, byte[] lpData, uint cbData);

		public static bool Inject(string AssemblyPath, string ManifestPath, uint ResourceName) 
		{
			byte[] manifestByteArray = null;
			bool result = false;
			FileStream manifestStream = null;
			BinaryReader manifestReader = null;
			IntPtr updatePointer = IntPtr.Zero;
			
			try 
			{
				// Read in the manifest as an array of byest to be injected to the 
				manifestStream = new FileStream(ManifestPath, FileMode.Open, FileAccess.Read);
				manifestReader = new BinaryReader(manifestStream);
				manifestByteArray = manifestReader.ReadBytes( (int)manifestStream.Length );

				// Begin the injection process
				updatePointer = (IntPtr)BeginUpdateResource(AssemblyPath, false);
			
				if (updatePointer == IntPtr.Zero) 
				{
					// Throws an exception with a specific failure HRESULT value if no pointer is returned
					Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
				}

				// The second argument, 24 (RT_MANIFEST), specifies that the resource is a manifest.  Details are at
				// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/resources/introductiontoresources/resourcereference/resourcetypes.asp
				if (UpdateResource(updatePointer, 24, ResourceName, 0, manifestByteArray, (uint)manifestByteArray.Length) != 1) 
				{
					// Throws an exception with a specific failure HRESULT value if the resulting update does not return 1
					Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
				} 
			}
			catch // (Exception ex) 
			{
				// Manage exception here
				result = true;
			}
			finally 
			{
				if (updatePointer != IntPtr.Zero) 
				{
					// Finalize the update
					EndUpdateResource(updatePointer, result);
				}
				if (manifestReader != null) 
				{
					manifestReader.Close();
				}
				if (manifestStream != null) 
				{
					manifestStream.Close();
				}
			}

			return !result;
		}
	}
}