add IntroduceIncrementAndDecrement setting for VB

ICSharpCode.Decompiler/Ast/Transforms/ReplaceMethodCallsWithOperators.cs

@@ -40,6 +40,13 @@ namespace ICSharpCode.Decompiler.Ast.Transforms
 			MemberName = "TypeHandle"
 		};
 		
+		DecompilerContext context;
+		
+		public ReplaceMethodCallsWithOperators(DecompilerContext context)
+		{
+			this.context = context;
+		}
+		
 		public override object VisitInvocationExpression(InvocationExpression invocationExpression, object data)
 		{
 			base.VisitInvocationExpression(invocationExpression, data);
@@ -211,7 +218,7 @@ namespace ICSharpCode.Decompiler.Ast.Transforms
 					}
 				}
 			}
-			if (assignment.Operator == AssignmentOperatorType.Add || assignment.Operator == AssignmentOperatorType.Subtract) {
+			if (context.Settings.IntroduceIncrementAndDecrement && (assignment.Operator == AssignmentOperatorType.Add || assignment.Operator == AssignmentOperatorType.Subtract)) {
 				// detect increment/decrement
 				if (assignment.Right.IsMatch(new PrimitiveExpression(1))) {
 					// only if it's not a custom operator

ICSharpCode.Decompiler/Ast/Transforms/TransformationPipeline.cs

@@ -35,7 +35,7 @@ namespace ICSharpCode.Decompiler.Ast.Transforms
 				new PushNegation(),
 				new DelegateConstruction(context),
 				new PatternStatementTransform(context),
-				new ReplaceMethodCallsWithOperators(),
+				new ReplaceMethodCallsWithOperators(context),
 				new IntroduceUnsafeModifier(),
 				new AddCheckedBlocks(),
 				new DeclareVariables(context), // should run after most transforms that modify statements

ICSharpCode.Decompiler/DecompilerSettings.cs

@@ -224,6 +224,23 @@ namespace ICSharpCode.Decompiler
 			}
 		}
 		
+		#region Options to aid VB decompilation
+		bool introduceIncrementAndDecrement = true;
+		
+		/// <summary>
+		/// Gets/Sets whether to use increment and decrement operators
+		/// </summary>
+		public bool IntroduceIncrementAndDecrement {
+			get { return introduceIncrementAndDecrement; }
+			set {
+				if (introduceIncrementAndDecrement != value) {
+					introduceIncrementAndDecrement = value;
+					OnPropertyChanged("IntroduceIncrementAndDecrement");
+				}
+			}
+		}
+		#endregion
+		
 		public event PropertyChangedEventHandler PropertyChanged;
 		
 		protected virtual void OnPropertyChanged(string propertyName)

ILSpy/VB/VBLanguage.cs

@@ -122,10 +122,10 @@ namespace ICSharpCode.ILSpy.VB
 			if (currentModule == null)
 				currentModule = currentType.Module;
 			DecompilerSettings settings = options.DecompilerSettings;
-			if (isSingleMember) {
 			settings = settings.Clone();
+			if (isSingleMember)
 				settings.UsingDeclarations = false;
-			}
+			settings.IntroduceIncrementAndDecrement = false;
 			return new AstBuilder(
 				new DecompilerContext(currentModule) {
 					CancellationToken = options.CancellationToken,