CODEWITHSUNDEEP
c#
John Edwards
John Edwards

Reputation: 1546

Checking if class is a type using a variable?

I am trying to see if it is possible to use a System.Type in a variable in a comparison.I have the following code:

    internal ObservableCollection<FREQUENCY> GetFrequencies(System.Type equipmenttype)
    {
        ... 
        foreach (var incident in query)
        {

            if (typeof(equipmenttype).IsSubclassOf(typeof(incident)))
            {
                foreach (var freq in incident.FREQUENCY)
                {
                    freqs.Add(freq);
                }
            }
        }
        return freqs;
    }

But the variables 'tmp' and 'equipmenttype' pull the error "The type or namespace name 'tmp' could not be found (are you missing a using directive or an assembly reference?)"

I understand that usually this is used by saying typeof(MYCLASS), but I was curious if this was possible using a variable of System.Type, or if there was any way to do that. Thanks.

Upvotes: 0

Views: 67

Answers (2)

John Saunders
John Saunders

Reputation: 161773

Try if (equipmenttype.IsSubclassOf(incident.GetType()). equipmenttype is already a System.Type, and GetType() must be called to determine the type of an instance.

Upvotes: 2

Sriram Sakthivel
Sriram Sakthivel

Reputation: 73462

I can't see where is tmp in you code. but sure you're missing this

if (typeof(equipmenttype).IsSubclassOf(typeof(incident)))

Should be 

if (equipmenttype.IsSubclassOf(incident.GetType()))

typeof operator is used to get the RuntimeType of a Type. But you already got RuntimeType here which is equipmenttype, So you don't need to use typeof here.

Upvotes: 4

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