Problem with generic list and extension method(C#3.0)
- by Newbie
I have an issue. I am making an extension class for a Collection and it is generic.. like
public static class ListExtensions
{
public static ICollection<T> Search<T>(this ICollection<T> collection, string stringToSearch)
{
ICollection<T> t1=null;
foreach (T t in collection)
{
Type k = t.GetType();
PropertyInfo pi = k.GetProperty("Name");
if (pi.GetValue(t,null).Equals(stringToSearch))
{
t1.Add(t);
}
}
return t1;
}
}
But I cannot add items to t1 as it is declared null.
Error: object reference not set to an instance of the object.
I am calling the method like
List<TestClass> listTC = new List<TestClass>();
listTC.Add(new TestClass { Name = "Ishu", Age = 21 });
listTC.Add(new TestClass { Name = "Vivek", Age = 40 });
listTC.Add(new TestClass { Name = "some one else", Age = 12 });
listTC.Search("Ishu");
And the test class is
public class TestClass
{
public string Name { get; set; }
public int Age { get; set; }
}
Using : (C#3.0) & Framework - 3.5
Thanks
