PM> Install-Package ILMerge.MSBuild.Tasks

2）把VS项目文件打开，用记事本 编辑

 <!-- Code to merge the assemblies into one:setup.exe -->
  <UsingTask TaskName="ILMerge.MSBuild.Tasks.ILMerge" AssemblyFile="$(SolutionDir)\packages\ILMerge.MSBuild.Tasks.1.0.0.3\tools\ILMerge.MSBuild.Tasks.dll" />
  <Target Name="AfterBuild">
    <ItemGroup>
      <MergeAsm Include="$(OutputPath)$(TargetFileName)" />
      <MergeAsm Include="$(OutputPath)LIB1_To_MERGE.dll" /> <!-- 这儿改成需要做嵌入的dll名 -->
      <MergeAsm Include="$(OutputPath)LIB2_To_MERGE.dll" />
    </ItemGroup>
    <PropertyGroup>
      <MergedAssembly>$(ProjectDir)$(OutDir)MERGED_ASSEMBLY_NAME.exe</MergedAssembly>
    </PropertyGroup>
    <Message Text="ILMerge @(MergeAsm) -&gt; $(MergedAssembly)" Importance="high" />
    <ILMerge InputAssemblies="@(MergeAsm)" OutputFile="$(MergedAssembly)" TargetKind="SameAsPrimaryAssembly" />
  </Target>

   public partial class App : Application
    {
        private static Assembly OnResolveAssembly(object sender, ResolveEventArgs args)
        {
            Assembly executingAssembly = Assembly.GetExecutingAssembly();
            var executingAssemblyName = executingAssembly.GetName();
            var resName = executingAssemblyName.Name + ".resources";
            
            AssemblyName assemblyName = new AssemblyName(args.Name);string path = "";
            if (resName == assemblyName.Name)
            {
                path = executingAssemblyName.Name + ".g.resources"; ;
            }
            else
            {
                path = assemblyName.Name + ".dll";
                if (assemblyName.CultureInfo.Equals(CultureInfo.InvariantCulture) == false)
                {
                    path = String.Format(@"{0}\{1}", assemblyName.CultureInfo, path);
                }
            }

            using (Stream stream = executingAssembly.GetManifestResourceStream(path))
            {
                if (stream == null)
                    return null;

                byte[] assemblyRawBytes = new byte[stream.Length];
                stream.Read(assemblyRawBytes, 0, assemblyRawBytes.Length);
                return Assembly.Load(assemblyRawBytes);
            }
        }

        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);
            AppDomain.CurrentDomain.AssemblyResolve += OnResolveAssembly;
        }
    }