检查类是否是使用变量的类型？

Question

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.

Answer 1

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.

Answer 2

尝试if (equipmenttype.IsSubclassOf(incident.GetType()) 。 equipmenttype已经是System.Type ，并且必须调用GetType()以确定实例的类型。