C# Activator.CreateInstance() throws "cannot create abstract class" exception in static class

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C# Activator.CreateInstance() throws exception cannot create abstract class exception in my static class.

my code is

Type t2 = Type.GetType(test);
Object o2 = (Activator.CreateInstance(t2));

Posted 9-Mar-15 20:30pm

rhl4569

Updated 10-Mar-15 19:47pm

v3

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Kornfeld Eliyahu Peter 10-Mar-15 2:33am

Please show the class definition code...

Kornfeld Eliyahu Peter 10-Mar-15 2:40am

It is hardly a class definition :-)

Sergey Alexandrovich Kryukov 10-Mar-15 2:43am

Didn't I just waste time on writing my Solution 1? After such inquirer's reply, I doubt that even my very detailed explanations can be understood :-(
—SA

Sergey Alexandrovich Kryukov 10-Mar-15 2:46am

Please see Solution 1.
Also note that 3rd line makes the result of 2nd line totally lost.
I would advise you step back to learning more basic aspects of language and platform; come back to reflection a bit later.
—SA

rhl4569 10-Mar-15 2:55am

ok. thnak you for your suggestion.

Sergey Alexandrovich Kryukov 10-Mar-15 3:10am

You are very welcome.
Good luck, call again.
—SA

phil.o 10-Mar-15 4:39am

The code you provided does not even compile, as you are defining the same variable (o2) twice.

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-03-09T20:41:00

What part of this error message can be unclear? Let's see…

In first line, you use this function: https://msdn.microsoft.com/en-us/library/w3f99sx1%28v=vs.110%29.aspx[^].

I have no idea why, but you were lucky enough to have this string recognized as some really existing type. But what type? As the exception tells you, the abstract one. What to do? Whatever you want. 1) leave your code as is: it behaves correctly, giving you quite expected response to your string; 2) change this string to the string representing some non-abstract non-static class name, 3) modify the same class, make it non-abstract and non-static.

—SA