C# reflection cast to variable type

Question

Just started studying reflection and im having a lot of issues. I want to cast to find the type of properties and then set them. So i wanted to cast to these properties type.

protected override object Load(SqlDataReader dr)
        {
            object item = Activator.CreateInstance(klass);



            foreach (var p in klass.GetProperties())
            {
                MethodInfo pSet = p.GetSetMethod();
                Type pType= p.PropertyType;
                object setParam = dr[p.Name]; 
                object[] paramArray = (object[])Array.CreateInstance(pType, 1);
                paramArray[0] = setParam;
                pSet.Invoke(item, paramArray);
            }
            return item;
        }

You really should include the errors that you are getting or what results you get and what you expect to get. Also where does klass come from? Is it a Type variable or just the actual name of the class? — juharr
– juharr, Commented Mar 19, 2018 at 15:36
This looks like another attempt at reinventing Dapper, which is fine if you're doing it for educational purposes, but not a hot idea if you want to use it for production code. (For starters, this approach is terribly slow, relatively speaking.) — Jeroen Mostert
– Jeroen Mostert, Commented Mar 19, 2018 at 15:39

Ohad Bitton · Accepted Answer · 2018-03-20 09:38:42Z

1

As they said you need to add your errors, but from what i see you have two problems:

You use klass as Type instead of typeof(klass) You try to cast a whole array to a new type - this can be solved using Array.ConvertAll... but the easier way would be to just initialize a regular array using: object[] paramArray = new object[1].

good luck

answered Mar 20, 2018 at 9:38

Ohad Bitton

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2 Comments

João Santos Over a year ago

New to c# and reflection as this is for college. The class has a property of the type Type named klass

Ohad Bitton Over a year ago

So again, please add more code and errors. Anyway, did you try changing the casting as i suggested?

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