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Wednesday, June 20, 2007

Constant & Read Only

 

 

Constant

Read Only

 

1

 

Assign meaningful constant values as part of the initialization process.

 

 

Set at run time. But cannot be modified after the constructor has executed.

 

2

Can only be used for primitive types.

Run-time constants can be of any type

3

The IL generated for a compile-time constant contains the value, not the symbol. The value is already "burned in" at compile time.

 

The IL generated when you reference a readonly constant reference the readonly variable, not the value.

 

4

Class Level Scope

Capable of storing different values for each instance of a class type.

 

Decision:

 

Ø  You can use const values as the parameters to attribute constructors; you cannot use readonly values, or variables.

So, when you define objects to use when constructing attributes, those values used for attribute parameters must be const; readonly doesn't work.


 

 

 

Thanks & Regards,

Arun Manglick

SMTS || Microsoft Technology Practice || Bridgestone - Tyre Link || Persistent Systems || 3023-6258

 

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