Dynamically enumerate fields from List

Question

I'm using the following method to enumerate fields of my classes-

EnumerateFields(typeof(Student));

void EnumerateFields(Type type)
{
    PropertyInfo[] props = type.GetProperties();
    foreach (PropertyInfo prp in props)
    {

    }
}

It works nicely.

Now I would like to do the same task from a List<>. Pseudo code-

EnumerateFields(List<Student>);

void EnumerateFields(List<T>)
{

}

Is there any way to do it?

What makes you think you need to do anything more than replace `Student` with `List` in the `typeof` operator? — Theodoros Chatzigiannakis, Mar 19 '16 at 13:03
Do you mean the properties of the list? If so, you just made a typo. If not, explain what you want. — Patrick Hofman, Mar 19 '16 at 13:10

score 2 · Accepted Answer · answered Mar 19 '16 at 13:17

I assume you want something like this:

void EnumerateFields<T>(List<T> input)
{
    PropertyInfo[] props = typeof(T).GetProperties();
    foreach (var r in input)
    {    
        foreach (PropertyInfo prp in props)
        {
            Console.WriteLine(prp.Name + " = " + prp.GetValue(r));
        }
    }
}

score 0 · Answer 2 · answered Mar 19 '16 at 13:14

0

If you're sure, you're passing in List<T>, you can still get the properties of T as:

private void EnumerateFields(Type type)
{
    Type subType = type.GetGenericArguments()[0];

    PropertyInfo[] props = subType.GetProperties();
    foreach (PropertyInfo prp in props)
    {
        // your logic here
    }
}

answered Mar 19 '16 at 13:14

Peter Szekeli

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You are not iterating the items in the list, but you are walking its properties. – Patrick Hofman Mar 21 '16 at 08:29

Dynamically enumerate fields from List

2 Answers2