dotnet build: Support resolving assembly references from server folde…

…r for plugins

MCGalaxy/Scripting/Scripting.cs

@@ -51,21 +51,38 @@ public static class IScripting
 
         // only used for resolving plugin DLLs depending on other plugin DLLs
         static Assembly ResolvePluginAssembly(object sender, ResolveEventArgs args) {
-            #if !NET_20
-            if (args.RequestingAssembly == null)       return null;
-            if (!IsPluginDLL(args.RequestingAssembly)) return null;
+            Assembly requestingAssembly = null;
+            // This property only exists in .NET framework 4.0 and later
+#if !NET_20
+            requestingAssembly = args.RequestingAssembly;
+#endif
+
+            if (requestingAssembly == null)       return null;
+            if (!IsPluginDLL(requestingAssembly)) return null;
 
             Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
             foreach (Assembly assem in assemblies)
             {
                 if (!IsPluginDLL(assem)) continue;
 
                 if (args.Name == assem.FullName) return assem;
-            }
-
+            }
+
+#if NETSTANDARD
+            // When there is a .deps.json, dotnet won't automatically always try looking in application's directory to resolve references
+            // https://learn.microsoft.com/en-us/dotnet/core/dependency-loading/default-probing?source=recommendations#how-are-the-properties-populated
+
+            try {
+                AssemblyName name = new AssemblyName(args.Name);
+                string path = name.Name + ".dll";
+                if (File.Exists(path)) return Assembly.LoadFrom(path);
+            } catch (Exception ex) {
+                Logger.LogError("Resolving plugin DLL reference", ex);
+            }
+#endif
+
             Logger.Log(LogType.Warning, "Custom command/plugin [{0}] tried to load [{1}], but it could not be found",
-                       args.RequestingAssembly.FullName, args.Name);
-            #endif
+                       requestingAssembly.FullName, args.Name);
             return null;
         }