protected override Expression VisitBinary(BinaryExpression node)
{
if (node.Equals(null))
{
return(base.VisitBinary(node));
}
var isAddOrSub = !node.NodeType.Equals(ExpressionType.Add) &&
!node.NodeType.Equals(ExpressionType.Subtract);
ConstantExpression constant = null;
if (isAddOrSub)
{
if (node.Left.NodeType.Equals(ExpressionType.Constant) ||
node.Right.NodeType.Equals(ExpressionType.Constant))
{
constant = node.Left.NodeType.Equals(ExpressionType.Constant)
? (ConstantExpression)node.Left
: (ConstantExpression)node.Right;
}
ParameterExpression parameter = null;
if (node.Left.NodeType.Equals(ExpressionType.Parameter) ||
node.Right.NodeType.Equals(ExpressionType.Parameter))
{
parameter = node.Left.NodeType.Equals(ExpressionType.Parameter)
? (ParameterExpression)node.Left
: (ParameterExpression)node.Right;
}
if (!NeedToTransform(parameter, constant))
{
return(base.VisitBinary(node));
}
return(node.NodeType == ExpressionType.Add ? Expression.Increment(node) : Expression.Decrement(node));
}
return(base.VisitBinary(node));
}