Can anyone please tell the meaning of undermentioned line in c#?

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public abstract class BasePage<T> : Page where T : class

Posted 2-Jan-14 2:35am

Sumit Bhargav

Updated 2-Jan-14 2:36am

v4

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Kornfeld Eliyahu Peter 2-Jan-14 8:38am

It seems like a syntax error?
Can you elaborate what you looking for?
Can you show the context in which this line is written?

Karthik_Mahalingam 2-Jan-14 8:41am

where you are facing the issue?
please add more info..
post your code, where u r getting error...

♥…ЯҠ…♥ 2-Jan-14 8:43am

Do you get error? I hope you wont

Sumit Bhargav 2-Jan-14 8:46am

I am not getting any error.I am trying to implement Unity Container and for that i have to register my class in the OnpreInit event of the default page and for that i am creating a class which will inherit the page class.Hence i am trying to understand the meaning of this code.

2 solutions

Solution 3

public : public access modifier so you can use this anywhere which references this class.
abstract : a placeholder for implementation and not creatable directly (you must implement a inherited one from this first).
class : class definition (as opposed to interface, struct etc.)
BasePage<t></t> : a generic object based on the definition of T
:Page : the above is inherited from the Page definition
where T :class : a modifier for the generic definition of T so it can only accept objects (so you can't have BasePage<int></int> etc.)

Posted 2-Jan-14 2:59am

Mehdi Gholam

Comments

Karthik_Mahalingam 2-Jan-14 9:29am

5, GOOD

Mehdi Gholam 2-Jan-14 11:16am

Thanks!

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Thomas Daniels · Accepted Answer · 2014-01-02T02:51:00

Quote:
Can anyone please tell the meaning of undermentioned line in c#?

The line:

C#

public abstract class BasePage<T> : Page where T : class

Means that you create an abstract class[^] that derives from Page. The BasePage class has one Generic Type Parameter[^], T, and the where T : class means that when you create a new instance of BasePage, the generic type parameter must be a reference type[^], not a value type[^]. If you pass a value type as generic type parameter, you get a compiler error.