Fix the issue where parameters in the base class constructor call are not passed correctly for inherited classes declared using the primary constructor form (e.g., the DeserializationException type in RestSharp), and also fix the subsequent issue where an extra parenthesis '()' is output if the base class is an interface (e.g., the XmlRestSerializer type in RestSharp).

Author: sonyps5201314

ICSharpCode.Decompiler/CSharp/Transforms/TransformFieldAndConstructorInitializers.cs

@@ -125,15 +125,21 @@ public override void VisitConstructorDeclaration(ConstructorDeclaration construc
 			if (context.DecompileRun.RecordDecompilers.TryGetValue(currentCtor.DeclaringTypeDefinition, out var record)
 				&& currentCtor.Equals(record.PrimaryConstructor))
 			{
-				if (record.IsInheritedRecord &&
-					ci?.ConstructorInitializerType == ConstructorInitializerType.Base &&
+				if (ci?.ConstructorInitializerType == ConstructorInitializerType.Base &&
 					constructorDeclaration.Parent is TypeDeclaration { BaseTypes: { Count: >= 1 } } typeDecl)
 				{
-					var baseType = typeDecl.BaseTypes.First();
-					var newBaseType = new InvocationAstType();
-					baseType.ReplaceWith(newBaseType);
-					newBaseType.BaseType = baseType;
-					ci.Arguments.MoveTo(newBaseType.Arguments);
+					// Only perform this transformation if the declaring type actually has a non-object class base.
+					// This prevents converting implemented interfaces into an invocation type (which caused the
+					// spurious trailing '()' in the decompiled output).
+					var baseClassType = currentCtor.DeclaringTypeDefinition.DirectBaseTypes.FirstOrDefault(b => b.Kind == TypeKind.Class);
+					if (baseClassType != null && !baseClassType.IsKnownType(KnownTypeCode.Object))
+					{
+						var baseType = typeDecl.BaseTypes.First();
+						var newBaseType = new InvocationAstType();
+						baseType.ReplaceWith(newBaseType);
+						newBaseType.BaseType = baseType;
+						ci.Arguments.MoveTo(newBaseType.Arguments);
+					}
 				}
 				if (constructorDeclaration.Parent is TypeDeclaration { PrimaryConstructorParameters: var parameters })
 				{