Add support for Synchronous Bindings when Self Hosting BrowserSubProcess

Resolves #4562

Author: amaitland

CefSharp.BrowserSubprocess.Core/BrowserSubprocessExecutable.h

@@ -28,12 +28,12 @@ namespace CefSharp
 
             }
 
+#ifdef NETCOREAPP
             /// <summary>
             /// This function should be called from the application entry point function (typically Program.Main)
             /// to execute a secondary process e.g. gpu, renderer, utility
             /// This overload is specifically used for .Net Core. For hosting your own BrowserSubProcess
             /// it's preferable to use the Main method provided by this class.
-            /// - Obtains the command line args via a call to Environment::GetCommandLineArgs
             /// </summary>
             /// <returns>
             /// If called for the browser process (identified by no "type" command-line value) it will return immediately
@@ -45,6 +45,7 @@ namespace CefSharp
                 auto subProcess = gcnew BrowserSubprocessExecutable();
                 return subProcess->Main(args, nullptr);
             }
+#endif
 
             /// <summary>
             /// This function should be called from the application entry point function (typically Program.Main)

CefSharp.BrowserSubprocess.Core/WcfBrowserSubprocessExecutable.h

@@ -31,6 +31,24 @@ namespace CefSharp
             {
 
             }
+
+            /// <summary>
+            /// This function should be called from the application entry point function (typically Program.Main)
+            /// to execute a secondary process e.g. gpu, renderer, utility
+            /// This overload is specifically used for .Net 4.x. For hosting your own BrowserSubProcess
+            /// it's preferable to use the Main method provided by this class.
+            /// </summary>
+            /// <returns>
+            /// If called for the browser process (identified by no "type" command-line value) it will return immediately
+            /// with a value of -1. If called for a recognized secondary process it will block until the process should exit
+            /// and then return the process exit code.
+            /// </returns
+            static int MainSelfHost(array<String^>^ args)
+            {
+                auto subProcess = gcnew WcfBrowserSubprocessExecutable();
+                return subProcess->Main(args, nullptr);
+            }
+
         protected:
             SubProcess^ GetSubprocess(IEnumerable<String^>^ args, int parentProcessId, IRenderProcessHandler^ handler) override
             {

CefSharp.Core/BrowserSubprocess/SelfHost.cs

@@ -77,12 +77,13 @@ public static int Main(string[] args)
                 browserSubprocessDllPath = Path.Combine(Path.GetDirectoryName(typeof(CefSharp.Core.BrowserSettings).Assembly.Location), "CefSharp.BrowserSubprocess.Core.dll");
             }
             var browserSubprocessDll = System.Runtime.Loader.AssemblyLoadContext.Default.LoadFromAssemblyPath(browserSubprocessDllPath);
+            var browserSubprocessExecutableType = browserSubprocessDll.GetType("CefSharp.BrowserSubprocess.BrowserSubprocessExecutable");
 #else
             var browserSubprocessDllPath = Path.Combine(Path.GetDirectoryName(typeof(CefSharp.Core.BrowserSettings).Assembly.Location), "CefSharp.BrowserSubprocess.Core.dll");
             var browserSubprocessDll = System.Reflection.Assembly.LoadFrom(browserSubprocessDllPath);
-            
+            var browserSubprocessExecutableType = browserSubprocessDll.GetType("CefSharp.BrowserSubprocess.WcfBrowserSubprocessExecutable");
 #endif
-            var browserSubprocessExecutableType = browserSubprocessDll.GetType("CefSharp.BrowserSubprocess.BrowserSubprocessExecutable");
+
             var browserSubprocessExecutable = Activator.CreateInstance(browserSubprocessExecutableType);
 
             var mainMethod = browserSubprocessExecutableType.GetMethod("MainSelfHost", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public);