Errors with AggregateResult

Question

I am getting an error on line 20 invalid character in identifier: Inspection__Service__c.

public with sharing class AddedServicesGrouping {

    public Inspection_Service__c[] Summaries {get; set;}

    public AddedServicesGrouping(){

        AggregateResult[] results =
                [SELECT Added_Services_Group__c AddedService, count_distinct(id) Quantity
                FROM Inspection_Service__c
                WHERE Status__c = 'Completed'
                GROUP BY Added_Services_Group__c];

        Summaries = new List<Inspection_Service__c>();

        for(AggregateResult ar: results){
            Summaries.add(new Inspection_Service__c(ar));
        }   
    }

    public class Inspection_Service__c{

        public Integer Quantity {get; private set;}
        public String Name {get; private set;}

        public Inspection_Service__c(AggregateResult ar){
            Quantity = (Integer) ar.get('Quantity');
            Name = (String) ar.get('Added_Services_Group__c');
        }
    }
}

And I also get the error: invalid field Quantity for SObject Inspection_Service__c for this visualforce page:

<apex:page controller="AddedServicesGrouping" readOnly="true">
<apex:form>
    <apex:repeat value="{!Summaries}" var="s">
        {!s.Name} : {!s.Quantity}<br/>
    </apex:repeat>
</apex:form>

Answer 1

Declaring an Apex class with the same API name as an Sobject will lead to unexpected results like this one. Your Visualforce page is trying to bind to what it thinks is an Sobject Inspection_Service__c, which doesn't have the fields Name and Quantity you're using.

Change the name of your wrapper class and you should be able to access its properties via Visualforce, provided you include appropriate getter and setter methods or synthesize them with { get; set; }.