instantiating class

[mp89]

I am instantiating a class in a switch statement as there are a number
of different overloads depending upon the data entered by the user.

The problem I have is that after instantiating my class, when I try to
call methods in the class later on in my code using the same object I
cannot, I get the error 'use of unassigned local variable'.

How do I get around this as I need some sort of switch/if statement to
instantiate my class?


Any assistance would be really appreciated.


Cheers,

Mike

 

[mp89]

Found the solution - setting the class to null when it is declared.


Mike

 

[DaZZleD]

well.. you could try to have something like

Object myObject = new Object();
switch (blabla)
{
    case 'aaa': myObject = new myClassAaa(); break;
    case 'bbb': myObject = new myClassBbb(); break;
    case 'ccc': myObject = new myClassCcc(); break;
}

then later on, either use System.Reflection namespace to call methods by using string as name, or Convert.ChangeType to change the object type to the class you need.



--------------------------
"two wrongs don't make a right, but three lefts do" - the unknown sage

 

[jby1]

Sounds likely that in any case where one of the switch conditions isn't met, then there would be some sort of error anyway?

In which case set the class to null in the default block of the switch statement. This should cover all possible paths of execution, and provide you with a means of testing if something has gone horribly wrong. Which it never should. of course ;-)

 

[chiph]

The curly-brackets introduce a new variable scoping level. So any variables you declare inside them is not visible outside the brackets.

Thus, you need to declare your variable outside the brackets, and instantiate it inside them.

Chip H.


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