cardProps.json

{
 "{<property>}": "Implicitly binds to `$data.<property>`",
 "$data": "The current data object",
 "$root": "The root data object.",
 "$index": "The current index when iterating",
 "$host": "Access properties of the host *(not working yet)*"
}

finalcard.json

{
 "type": "AdaptiveCard",
 "body": [{
   "type": "TextBlock",
   "size": "Medium",
   "weight": "Bolder",
   "text": "My list of people"
  },
  {
   "type": "FactSet",
   "facts": [{
     "title": "Micky Mouse",
     "value": "44"
    },
    {
     "title": "Harry Potter",
     "value": "18"
    },
    {
     "title": "Matt Hidinger",
     "value": "28"
    }
   ]
  }
 ],
 "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
 "version": "1.0"
}

sampleCodeC.cs

// Create card
    var card = new AdaptiveCard(new AdaptiveSchemaVersion(1, 0))
    {
        // Use LINQ to turn the choices into submit actions
        Actions = choices.Select(choice => new AdaptiveSubmitAction
        {
            Title = choice,
            Data = choice,  // This will be a string
        }).ToList<AdaptiveAction>(),
    };

sampledata.json

{
 "title": "My list of people:",
 "count": 4,
 "people": [{
   "firstName": "Micky",
   "lastName": "Mouse",
   "age": 44
  },
  {
   "firstName": "Donald",
   "lastName": "Duck",
   "age": 12
  },
  {
   "firstName": "Harry",
   "lastName": "Potter",
   "age": 18
  },
  {
   "firstName": "Matt",
   "lastName": "Hidinger",
   "age": "28"
  }
 ]
}

sampletemplate.json

{
    "type": "AdaptiveCard",
    "body": [
        {
            "type": "TextBlock",
            "size": "Medium",
            "weight": "Bolder",
            "text": "{title}"
        },
        {
            "type": "FactSet",
            "facts": [
                {
                  "$data": "{people}",
                  "$when": "{$index.age > 12}",
                  "title": "{$index.firstName} {$index.lastName}",
                  "value": "{$index.age}"
                }
            ]
        }
    ],
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.0"
}