Question

In c#, can we determine what type a List is holding before doing something else? Example:

List<int> listing = new List<int>();

if(listing is int)
{
    // if List use <int> type, do this...
}
else if(listing is string)
{
    // if List use <string> type, do this...
}

Answer 1

You can use Type.GetGenericArguments() method.

Like:

Type[] types = list.GetType().GetGenericArguments();
if (types.Length == 1 && types[0] == typeof(int))
{
    ...
}