/// <summary> /// 访问表达式树后自动删掉访问的成员痕迹 /// </summary> /// <param name="visit">访问委托</param> protected void VisitWithoutRemark(Action <object> visit) { int visitedQty = _visitedStack.Count; visit(null); if (_visitedStack.Count != visitedQty) { _visitedStack.Remove(_visitedStack.Count - visitedQty); } }
/// <summary> /// 将调度到此类中更专用的访问方法之一的表达式。 /// </summary> /// <param name="node">方法节点</param> /// <param name="router">方法路由</param> /// <returns></returns> public Expression Visit(Expression node, MethodCall router) { int visitedQty = _visitedStack.Count; Expression newNode = null; if (router == MethodCall.Coalesce) { newNode = this.VisitCoalesce((BinaryExpression)node); } else if (router == MethodCall.EqualNull) { newNode = this.VisitEqualNull((BinaryExpression)node); } else if (router == MethodCall.MethodCall) { newNode = this.VisitMethodCall((MethodCallExpression)node); } else if (router == MethodCall.BinaryCall) { newNode = this.VisitMethodCall((BinaryExpression)node); } else if (router == MethodCall.MemberMember) { newNode = this.VisitMemberMember((MemberExpression)node); } else if (router == MethodCall.Unary) { newNode = this.VisitUnary((UnaryExpression)node); } // 自身已构成布尔表达式的则需要删除它本身所产生的访问链 if (_visitedStack.Count != visitedQty) { bool b = router != MethodCall.Unary; if (b && router == MethodCall.MethodCall) { var m = (MethodCallExpression)node; b = _removeVisitedMethods.Contains(m.Method.Name); } if (b) { _visitedStack.Remove(_visitedStack.Count - visitedQty); } } return(newNode); }