Instance class members by name 1

[bobisto]

I've a class with private members and public property on them. I want to be able to instance class members by name. For example.
public class Position
{
private int _x;
private int _y;

public Position(){}

public int x
{
get {return _x;}
set {_x = value;}
}
public int y
{
get {return _y;}
set {_y = value;}
}

}

I want in code to be able to write also:
Position Position1 = new Position;
Position1("x") = 1;
Position1("y") = 2;

Please help!

 

[jby1]

It is not awfully clear what you are trying to achieve here, but the code you have put down will not compile. If you want to get it to do what I think you want it to do, then do this :

Position Position1 = new Position();
Position1.x = 1;
Position1.y = 2;

 

[JohnYingling]

Maybe.
[System.Runtime.CompilerServices.CSharp.IndexerName("Item")]
public int this [char index] // Indexer declaration
{
get
{
char c = char.ToLower(index);
if (c == 'x')
return _X;
if (c == 'y')
return _y;
throw new System.IndexOutOfRangeException("x or y")
}
set
{
char c = char.ToLower(index);
if (c == 'x')
_x = value;
if (c == 'y')
_y = value;
throw new System.IndexOutOfRangeException("x or y")
}
}

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Check To MS)

 

[chiph]

You can also use reflection to call methods, properties, etc.

Generally, you use GetType to return a variable of type Type, which then has methods to index into collections of that type's methods, properties, etc. You can then call them by name.

It's slow, but it works.

A better solution, if you're not sure what you'll be calling at runtime, would be to define an Interface or abstract base class. That way you'll be 100% of the method to call because the compiler enforces it.

Chip H.


____________________________________________________________________
If you want to get the best response to a question, please read FAQ222-2244 first

 

[bobisto]

Thanks to all for their posts.
For the helpfull one from JohnYingling, I've give a big red star.