Check if the typeof(object) in a List is a reference type
this seems odd to me:
if(customerList.Count > 0)
{
if(typ开发者_如何学Goeof(customerList[0]).IsReferenceType)
{
// do what I want
}
}
How would you do it?
To determine whether the first item in a list is an object of a reference type:
bool isReferenceType = !(customerList[0] is ValueType);
To determine whether a list is a
List<T>
for someT
that is a reference type:var listType = customerList.GetType(); if (!listType.IsGeneric || listType.GetGenericTypeDefinition() != typeof(List<>)) // It’s not a List<T> return null; return !listType.GetGenericArguments()[0].IsValueType;
You are probably trying to determine the actual type of the generic parameter of a generic collection. Like determining at runtime what is a T of a particular List<T>
. Do this:
Type collectionType = typeof(customerList);
Type parameterType = collectionType.GetGenericArguments()[0];
bool isReference = !parameterType.IsValueType;
bool isReferenceType = !(customerList[0] is ValueType);
EDIT
Or are you looking for something like:
bool listIsOfReferenceTypeObjects = !myList.GetType().GetGenericArguments()[0].IsValueType;
ok that worked and I get no exception, when the customerList is empty.
Type collectionType = customerList.GetType();
Type parameterType = collectionType.GetGenericArguments()[0];
bool isReference = !parameterType.IsValueType;
@Adesit you get a point because your sample was right except the first line :P
精彩评论