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Join Date: Aug 2006

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PoovenM

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.class

Dec 10th, 2007

Hey guys,

I was wondering, in Java the following is allowed:

 Help with Code Tags 
 java Syntax (Toggle Plain Text) 
Class[] classList = new Class[10];
classList[0] = System.class;
Class[] classList = new Class[10];
classList[0] = System.class;

Can this be done in C#?

Thanks!

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Join Date: Aug 2006

Posts: 2,065

Reputation: Ramy Mahrous is just really nice

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Ramy Mahrous Ramy Mahrous is offline

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Re: .class

Dec 10th, 2007

That's a type of reflection methods in JAVA, actually C# treats with System.Type not System.Class like

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 C# Syntax (Toggle Plain Text) 
Type[] types = new Type[10];
types[0] = System.String;
types[1] = System.TextBox;
.....
Type[] types = new Type[10];
types[0] = System.String;
types[1] = System.TextBox;
.....

Last edited by Ramy Mahrous; Dec 10th, 2007 at 10:52 am.

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Join Date: Aug 2006

Posts: 137

Reputation: PoovenM is on a distinguished road

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PoovenM

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Re: .class

Dec 10th, 2007

I was thinking I'd have to use the Type class but I wasn't sure how I'd get the 'type' of the class into the array. Thanks Remy!!

I was wondering, would the following situation be possible?

I have an object that can be one of several classes, however only a certain subset of these class are accpetable. I was thinking that the following might be possible:

 Help with Code Tags 
 C# Syntax (Toggle Plain Text) 
Type[]  classList = ...
WTTag tag = ...
for (int k = 0; k < classList.Length; k++)
       if (tag is classList[k])
              ...
Type[]  classList = ...
WTTag tag = ...
for (int k = 0; k < classList.Length; k++)
       if (tag is classList[k])
              ...

Would this be valid

Last edited by PoovenM; Dec 10th, 2007 at 11:02 am.

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Join Date: Aug 2006

Posts: 2,065

Reputation: Ramy Mahrous is just really nice

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Ramy Mahrous Ramy Mahrous is offline

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Re: .class

Dec 10th, 2007

Any class, interface, struct, enum or delegate is Type.

Your code is wrong as 'is' take a type not an instance; like

 Help with Code Tags 
 C# Syntax (Toggle Plain Text) 
if (tag is WTTag) .....
if (tag is WTTag) .....

Your logic isn't right as classList carries instances from one type so loop won't be useful as classList[0] like classList[1] like classList[2] like....

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Join Date: Aug 2006

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PoovenM

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Re: .class

Dec 11th, 2007

I'm not sure I fully understand Ramy; so all my classes have a Type. This Type is unique to a class and is similar to the ClassName.class attribute in Java? Except that a Type is implicately accessed:

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C# Syntax (Toggle Plain Text)

Type classType = MyClassName;

The as operator takes an object and determines if it is an instance of a particular class right? If this is the case then based on what you've said, when I stored the 'Type' of a class in the array I don't really store enough information about the class to do an is comparison? That is, in general the following will not work:

 Help with Code Tags 
 C# Syntax (Toggle Plain Text) 
Type classType = System.String;
String hello;
if (hello is classType) ...
Type classType = System.String;
String hello;
if (hello is classType) ...

I actually get a compile error (in the first line) so I guess that answers my question. Thanks again hey!