Dispatches to the specific visit method for this node type. For example, System.Linq.Expressions.MethodCallExpression calls the ExpressionVisitor.VisitMethodCall(MethodCallExpression).
The result of visiting this node.
This default implementation for ExpressionType.Extension nodes calls ExpressionVisitor.VisitExtension(Expression). Override this method to call into a more specific method on a derived visitor class of the System.Linq.Expressions.ExpressionVisitor class. However, it should still support unknown visitors by calling ExpressionVisitor.VisitExtension(Expression).