Using MetadataLoadContext to load assmebly

src/dotnet-svcutil/lib/src/CommandProcessorOptions.cs

@@ -9,6 +9,7 @@
 using System.IO;
 using System.Linq;
 using System.Reflection;
+using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -807,25 +808,22 @@ private void LoadReferencedAssemblies()
         {
             // we should not load the ServiceModel assemblies as types will clash with the private code types.
             var loadableReferences = this.References.Where(r => !TargetFrameworkHelper.ServiceModelPackages.Any(s => s.Name == r.Name));
+
+            string projFolder = Path.Combine(this.BootstrapPath.FullName, nameof(SvcutilBootstrapper));
+            DirectoryInfo directoryInfo = new DirectoryInfo(projFolder); 
+
+
             foreach (ProjectDependency reference in loadableReferences)
             {
                 Assembly assembly = null;
 
-                if (this.ToolContext == OperationalContext.Infrastructure)
-                {
-                    string projFolder = Path.Combine(this.BootstrapPath.FullName, nameof(SvcutilBootstrapper));
-                    DirectoryInfo directoryInfo = new DirectoryInfo(projFolder);
-                    FileInfo assemblyFile = directoryInfo.GetFiles(reference.AssemblyName + ".*", SearchOption.AllDirectories).FirstOrDefault();
-                    if (assemblyFile != null)
-                    {
-                        assembly = Assembly.LoadFrom(assemblyFile.FullName);
-                    }
-                }
-                else
+                FileInfo assemblyFile = directoryInfo.GetFiles(reference.AssemblyName + ".*", SearchOption.AllDirectories).FirstOrDefault();
+
+                if (assemblyFile != null)
                 {
-                    assembly = TypeLoader.LoadAssembly(reference.AssemblyName);
+                    assembly = TypeLoader.LoadAssembly(assemblyFile.FullName);
                 }
-
+               
                 if (assembly != null)
                 {
                     if (!this.ReferencedAssemblies.Contains(assembly))

src/dotnet-svcutil/lib/src/TypeLoader.cs

@@ -5,8 +5,8 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using System.Reflection;
+using System.Runtime.InteropServices;
 using System.Runtime.Serialization;
 
 namespace Microsoft.Tools.ServiceModel.Svcutil
@@ -17,16 +17,15 @@ internal static class TypeLoader
 
         static public Assembly LoadAssembly(string path)
         {
-            string DotDll = ".dll";
-            string DotExe = ".exe";
+            string[] runtimeAssemblies = Directory.GetFiles(RuntimeEnvironment.GetRuntimeDirectory(), "*.dll");
+            var paths = new List<string>(runtimeAssemblies);
 
-            if (path.EndsWith(DotDll, StringComparison.OrdinalIgnoreCase) || path.EndsWith(DotExe, StringComparison.OrdinalIgnoreCase))
-            {
-                path = path.Remove(path.Length - DotDll.Length, DotDll.Length);
-            }
+            var resolver = new PathAssemblyResolver(paths);
+            var mlc = new MetadataLoadContext(resolver);
+
             try
             {
-                return Assembly.Load(new AssemblyName(path));
+                return mlc.LoadFromAssemblyPath(path);
             }
             catch (Exception ex)
             {
@@ -49,10 +48,7 @@ static public Type[] LoadTypes(Assembly assembly, Verbosity verbosity)
                 listType.AddRange(Array.FindAll<Type>(rtle.Types, delegate (Type t)
                 {
                     return t != null;
-                }));
-
-                //type.Module or type.Assembly could throw if multiple assembly with same name get referenced but only one version get restored.                
-                listType = listType.Except(GetUnAvailableTypes(listType)).ToList();
+                }));               
 
                 if (verbosity > Verbosity.Normal)
                 {

src/dotnet-svcutil/lib/src/dotnet-svcutil-lib.csproj

@@ -64,6 +64,7 @@
     <PackageReference Include="System.Reflection.Emit.Lightweight" Version="4.6.0" />
     <PackageReference Include="System.Runtime.Loader" Version="4.3.0" />
     <PackageReference Include="System.Reflection.DispatchProxy" Version="4.4.0" />
+    <PackageReference Include="System.Reflection.MetadataLoadContext" Version="6.0.0" />
   </ItemGroup>
 
   <!-- Include resx files here so that arcade will handle them correctly. -->