strange bug - object scope?

[CannonFodder]

Hi all, i have a bit of a weird problem i'll try and explain what
happens:

I have a class called "Rules" which contains lots of objects of type
"RuleLocator" or "RuleFormatter" (both inheriting from "aRule").

I also have a class called "WMIScanner" which appies "Rules" to data.
When i define my "Rules" object within the constructor of "WMIScanner"
everything runs fine, however if i try and pass a "Rules" object into
"WMIScanner" from another class - called Scanner i get errors.
"Specified Cast is not valid"

this happens even though i am using the exact same code - just
defining the obejct outside of the "WMIScanner" class instead of
inside. The "Rules" object does not contain any references to
anything outside itself.

Does anyone know what might be happening here?

Thanks in advance for any help

Code follows:

This causes errors:
public WMIScanner(string ComputerName, Rules r)
{
strComputerName = ComputerName;
myRules = r;

Connect();
}

This doesnt error - but i dont want to leave it this way:

public WMIScanner(string ComputerName)
{
strComputerName = ComputerName;
Connect();
...
declare individual rules (ruleCapacity etc..)
...
myRules = new Rules();
myRules.addRule(ruleCapacity);
myRules.addRule(ruleSpeed);
myRules.addRule(ruleFreeSpace);

myRules.addRule(myLocatorRule);
myRules.addRule(XPRule);
myRules.addRule(DellRule);
myRules.addRule(CompaqRule);
myRules.addRule(FreeSpaceRule);

myRules.addRule(myFlat);
myRules.addRule(myFlat2);
myRules.addRule(myFlat3);
}

[Jon Skeet [C# MVP]]

CannonFodder <ga****@sol-tec.com> wrote:

Hi all, i have a bit of a weird problem i'll try and explain what
happens:

I have a class called "Rules" which contains lots of objects of type
"RuleLocator" or "RuleFormatter" (both inheriting from "aRule").

I also have a class called "WMIScanner" which appies "Rules" to data.
When i define my "Rules" object within the constructor of "WMIScanner"
everything runs fine, however if i try and pass a "Rules" object into
"WMIScanner" from another class - called Scanner i get errors.
"Specified Cast is not valid"

this happens even though i am using the exact same code - just
defining the obejct outside of the "WMIScanner" class instead of
inside. The "Rules" object does not contain any references to
anything outside itself.

Does anyone know what might be happening here?

Could you post a short but complete program which demonstrates the
problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

Are all the classes in the same project ( assembly) ?

Both the WMIScanner, Rules , aRule and the class that use them?

Maybe you are defining the same class in two different places.

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"CannonFodder" <ga****@sol-tec.com> wrote in message
news:7f**************************@posting.google.c om...

Hi all, i have a bit of a weird problem i'll try and explain what
happens:

I have a class called "Rules" which contains lots of objects of type
"RuleLocator" or "RuleFormatter" (both inheriting from "aRule").

I also have a class called "WMIScanner" which appies "Rules" to data.
When i define my "Rules" object within the constructor of "WMIScanner"
everything runs fine, however if i try and pass a "Rules" object into
"WMIScanner" from another class - called Scanner i get errors.
"Specified Cast is not valid"

this happens even though i am using the exact same code - just
defining the obejct outside of the "WMIScanner" class instead of
inside. The "Rules" object does not contain any references to
anything outside itself.

Does anyone know what might be happening here?

Thanks in advance for any help

Code follows:

This causes errors:
public WMIScanner(string ComputerName, Rules r)
{
strComputerName = ComputerName;
myRules = r;

Connect();
}

This doesnt error - but i dont want to leave it this way:

public WMIScanner(string ComputerName)
{
strComputerName = ComputerName;
Connect();
...
declare individual rules (ruleCapacity etc..)
...
myRules = new Rules();
myRules.addRule(ruleCapacity);
myRules.addRule(ruleSpeed);
myRules.addRule(ruleFreeSpace);

myRules.addRule(myLocatorRule);
myRules.addRule(XPRule);
myRules.addRule(DellRule);
myRules.addRule(CompaqRule);
myRules.addRule(FreeSpaceRule);

myRules.addRule(myFlat);
myRules.addRule(myFlat2);
myRules.addRule(myFlat3);
}