.class

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Views: 437 | Replies: 4 | Solved

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Join Date: Aug 2006

Location: South Africa, Durban

Posts: 107

Reputation: PoovenM is an unknown quantity at this point

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PoovenM

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Junior Poster

.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

Location: Egypt

Posts: 762

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RamyMahrous RamyMahrous 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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(Toggle Plain Text)

Type[] types = new Type[10];
types[0] = System.String;
types[1] = System.TextBox;
.....

Last edited by RamyMahrous : Dec 10th, 2007 at 9:52 am.

B.Sc Computer Science, Helwan University
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Join Date: Aug 2006

Location: South Africa, Durban

Posts: 107

Reputation: PoovenM is an unknown quantity at this point

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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 10:02 am.

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Join Date: Aug 2006

Location: Egypt

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RamyMahrous RamyMahrous 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

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(Toggle Plain Text)

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

Location: South Africa, Durban

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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:

Help with Code Tags

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!