Invalid field Email for SObject AggregateResult in VisualForce - salesforce

Question

I want to display the AggregateResult on my Visualforce page but it is generating the following error " Invalid field Email for SObject AggregateResult"
Below is my code:
public with sharing class searchDuplicate {
public AggregateResult[] con{get;set;}
public searchDuplicate()
{
find();
}
public void find(){
con = [select Email from Contact group by Email having count(Email) > 1];
System.debug(con);
}
}
Below is my visualforce page code:
<apex:page controller="searchDuplicate">
<apex:pageBlock title="Searching for Duplicate Contacts Record">
</apex:pageBlock>
<apex:pageBlock title="Contacts">
<apex:dataTable value="{!con}" var="c" border="2" cellspacing="5" cellpadding="5">
<apex:column headerValue="Email" value="{!c['Email']}" />
</apex:dataTable>
</apex:pageBlock>
</apex:page>
kindly Make a correction if possible

Answer 1

public with sharing class searchDuplicate {
public list <con> conList{get;set;}
public class con{
public string Email {get;set;}
public con( string email){
this.Email = email;
}
}
public searchDuplicate()
{
find();
}
public void find(){
conList = new list <con>();
for( AggregateResult ar : [select Email from Contact group by Email having count(Email) > 1];){ conList.add(new con(string.valueOf(ar.get('Email')))) }
}
}

Answer 2

Aggregate results (and their fields/columns) come as generic Objects, not sObjects. Therefore there's no obj.get('somefieldname') you can call on them.
Your best option might be to make a helper class that has String email; Integer count; fields and loop through the query results populating a list of objects of this helper class.
You could also use Map<String, Integer> but that'd come to VF as not sorted alphabetically.
See https://salesforce.stackexchange.com/questions/7412/count-a-grouped-by-soql if you need a code sample.

Answer 3

Although the other answers are correct in solving your problem, what you have is actually a bug in SalesForce.
The way to resolve this without creating a custom object is to separate the into two - The "headerValue" and "value" both being set cause this error.
You want to change it to this:
<apex:dataTable value="{!con}" var="c" border="2" cellspacing="5" cellpadding="5">
<apex:column headerValue="Email" >
<apex:outputText>{!c['Email']}</apex:outputText>
</apex:column>
</apex:dataTable>
Thanks,
Michael