How best to differentiate boolean values in a long list?

I have a large C# Dictionary of string keys and boolean values. Background on the reason for it is this: my program builds up a bunch of the same objects from two different sources, and then compares all the properties to see if there are any disparates. But I want to ignore the differences where I know one source hasn't exposed that property for comparison, so I have this array that lists the properties that are actually 'gathered'.

Then when filtering the differences before user display, I ask if(!gathered[prop]) and remove it in that case. It would throw an exception if I hadn't defined a case for the property, and I don't want to ignore that as it may just mean I neglected to specify if it was or wasn't gathered.

public Dictionary TPORGatheredData = new Dictionary()
    {
        // Represents fields that are actually retrieved from TP data
        { "Reference", true },
        { "Title", true },
        { "Status", true },
        { "Status.State", true },
        { "OriginatorName", true },
        { "InvestigatorName", true },
        { "ManagerName", true },
        { "ObservedOn", true },
        { "RaisedOn", true },
        { "ClosedOn", true },
        { "Project", true },
        { "VariantObservedOn", true },
        { "SoftwareVersionObserved", true },
        { "AreaObservedOn", true },
        { "StageObservedOn", true },
        { "VariantAppliedTo", true },
        { "AreaAppliedTo", true },
        { "FaultClassification", true },
        { "Type", true },
        { "SecurityClassification", true },
        { "CommercialClassification", true },
        { "SecurityGroup", true },
        { "SafetyRelated", true },
        { "Description", false },
        { "Recommendations", true },
        { "Recommendations.PointNumber", true },
        { "Recommendations.Id", true },
        { "Recommendations.Type", true },
        { "Recommendations.RecommendationText", true },
        { "ClosureText", true },
    };

The problem with this is th

Is this more like what you're after?

var TPORGatheredData = new[]
        {
            // Add all values in the logical order that you want them
            "Reference",
            "Title",
            "Status",
            "Status.State",
            //...omitted for brevity
            "Description",
            "ClosureText"

        }.ToDictionary(x=>x,x=>true);

        // This is significant
        TPORGatheredData["Description"] = false;

StackExchange Code Review Q#32188, answer score: 8