Z
Zach
Is it possible to use "get" and "set"
where "value" is say three ints.
If so, is there sample code anywhere?
Adrian.
where "value" is say three ints.
If so, is there sample code anywhere?
Adrian.
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M
Marc Gravell
Not as a single property;
you could:
a: Write a Get method that has 3 "out" params, and a Set method with 3
params
b: use an array
c: create a struct with the 3 values
Marc
you could:
a: Write a Get method that has 3 "out" params, and a Set method with 3
params
b: use an array
c: create a struct with the 3 values
Marc
A
Adrian
Thank you Marc.
A
Adrian
Could you please tell me how to modify the code so it will work?
using System;
using System.Collections;
namespace trial_two
{
public class Class1
{
static void Main(string[] args)
{
HashArray ha = new HashArray();
Display d = new Display(22,33);
ha.hash = d; // error here ********
}
public class HashArray
{
public Hashtable hash = new Hashtable();
Display this[int loc]
{
get
{
return hash[loc] as Display;
}
set
{
hash.Add(loc, value);
}
}
}
}
public class Display
{
int arg1;
int arg2;
public Display(int arg1, int arg2)
{
this.arg1 = arg1;
this.arg2 = arg2;
}
}
}
using System;
using System.Collections;
namespace trial_two
{
public class Class1
{
static void Main(string[] args)
{
HashArray ha = new HashArray();
Display d = new Display(22,33);
ha.hash = d; // error here ********
}
public class HashArray
{
public Hashtable hash = new Hashtable();
Display this[int loc]
{
get
{
return hash[loc] as Display;
}
set
{
hash.Add(loc, value);
}
}
}
}
public class Display
{
int arg1;
int arg2;
public Display(int arg1, int arg2)
{
this.arg1 = arg1;
this.arg2 = arg2;
}
}
}
J
Jon Skeet [C# MVP]
Adrian said:Could you please tell me how to modify the code so it will work?
Well, it's not clear what it's meant to be doing.
The reason the code doesn't compile is that you're trying to assign the
value of d, which is a Display, to ha.hash, which is a Hashtable. It's
like saying:
Hashtable hash = new Display(22, 33);
What were you trying to do with that line?
A
Adrian
Hi John,
Sorry I left out the [1] in my trial code.
I was sorting out some Code. In an endeavor to do that
I was breaking the Code down into component logics
and made this silly mistake. Must have been a bit tired.
So I have no question at this stage. Again apologies.
Adrian.
Sorry I left out the [1] in my trial code.
I was sorting out some Code. In an endeavor to do that
I was breaking the Code down into component logics
and made this silly mistake. Must have been a bit tired.
So I have no question at this stage. Again apologies.
Adrian.
A
Adrian
John
In case you are wondering what on earth I am
doing, the code below was the trial code. I
was sorting out how to get several values
into "value" in a get / set context.
Adrian.
using System;
using System.Collections;
namespace trial_two
{
public class Class1
{
static void Main(string[] args)
{
HashArray ha = new HashArray();
Display d = new Display(22,33);
ha.hash[1] = d;
d.show(d);
}
public class HashArray
{
public Hashtable hash = new Hashtable();
Display this[int loc]
{
get
{
return hash[loc] as Display;
}
set
{
hash.Add(loc, value);
}
}
}
}
public class Display
{
int arg1;
int arg2;
public Display(int arg1, int arg2)
{
this.arg1 = arg1;
this.arg2 = arg2;
}
public void show(Display dis)
{
Console.WriteLine("{0} {1}", dis.arg1, dis.arg2);
}
}
}
In case you are wondering what on earth I am
doing, the code below was the trial code. I
was sorting out how to get several values
into "value" in a get / set context.
Adrian.
using System;
using System.Collections;
namespace trial_two
{
public class Class1
{
static void Main(string[] args)
{
HashArray ha = new HashArray();
Display d = new Display(22,33);
ha.hash[1] = d;
d.show(d);
}
public class HashArray
{
public Hashtable hash = new Hashtable();
Display this[int loc]
{
get
{
return hash[loc] as Display;
}
set
{
hash.Add(loc, value);
}
}
}
}
public class Display
{
int arg1;
int arg2;
public Display(int arg1, int arg2)
{
this.arg1 = arg1;
this.arg2 = arg2;
}
public void show(Display dis)
{
Console.WriteLine("{0} {1}", dis.arg1, dis.arg2);
}
}
}
A
Adrian
John,
Is this OK / can it be improved?
(I does work).
Adrian.
using System;
using System.Collections;
namespace trial_two
{
public class Class1
{
static void Main(string[] args)
{
HashArray ha = new HashArray();
Display d = new Display(22,33);
ha.hash[1] = d;
Display di = ha.hash[1] as Display;
di.show();
}
public class HashArray
{
public Hashtable hash = new Hashtable();
Display this[int loc]
{
get
{
return hash[loc] as Display;
}
set
{
hash.Add(loc, value);
}
}
}
}
public class Display
{
int arg1;
int arg2;
public Display(int arg1, int arg2)
{
this.arg1 = arg1;
this.arg2 = arg2;
}
public void show()
{
Console.WriteLine("{0} {1}", arg1, arg2);
}
}
}
Is this OK / can it be improved?
(I does work).
Adrian.
using System;
using System.Collections;
namespace trial_two
{
public class Class1
{
static void Main(string[] args)
{
HashArray ha = new HashArray();
Display d = new Display(22,33);
ha.hash[1] = d;
Display di = ha.hash[1] as Display;
di.show();
}
public class HashArray
{
public Hashtable hash = new Hashtable();
Display this[int loc]
{
get
{
return hash[loc] as Display;
}
set
{
hash.Add(loc, value);
}
}
}
}
public class Display
{
int arg1;
int arg2;
public Display(int arg1, int arg2)
{
this.arg1 = arg1;
this.arg2 = arg2;
}
public void show()
{
Console.WriteLine("{0} {1}", arg1, arg2);
}
}
}
A
Adrian
Re code that I posted last
What is the reason that I cannot write ha[1] = d?
What is the reason that I cannot write ha[1] = d?
J
Jon Skeet [C# MVP]
Adrian said:Re code that I posted last
What is the reason that I cannot write ha[1] = d?
Because the default access level is private. If you make the property
public (or even just internal) it'll be fine.
G
Gino
Adrian said:Re code that I posted last
What is the reason that I cannot write ha[1] = d?
What if you try
ha.add(1, d);
Display di = (Display)ha.ContainsKey(1);
A
Adrian
Thank you John.
A
Adrian
John, would the code below represent "cloning"?
using System;
using System.Collections;
namespace trial_two
{
public class Class1
{
static void Main(string[] args)
{
HashArray ha = new HashArray();
ha[1] = new Display(22,33);;
ha[2] = new Display(44,55);;
for(int i = 1 ; i < 3; i++)
(ha as Display).show();
}
}
public class HashArray
{
public Hashtable hash = new Hashtable();
public Display this[int loc]
{
get
{
return hash[loc] as Display;
}
set
{
hash.Add(loc, value);
}
}
}
public class Display
{
public int arg1;
public int arg2;
public Display(int arg1, int arg2)
{
this.arg1 = arg1;
this.arg2 = arg2;
}
public void show()
{
Console.WriteLine("{0}, {1}", arg1, arg2);
}
}
}
using System;
using System.Collections;
namespace trial_two
{
public class Class1
{
static void Main(string[] args)
{
HashArray ha = new HashArray();
ha[1] = new Display(22,33);;
ha[2] = new Display(44,55);;
for(int i = 1 ; i < 3; i++)
(ha as Display).show();
}
}
public class HashArray
{
public Hashtable hash = new Hashtable();
public Display this[int loc]
{
get
{
return hash[loc] as Display;
}
set
{
hash.Add(loc, value);
}
}
}
public class Display
{
public int arg1;
public int arg2;
public Display(int arg1, int arg2)
{
this.arg1 = arg1;
this.arg2 = arg2;
}
public void show()
{
Console.WriteLine("{0}, {1}", arg1, arg2);
}
}
}
A
Adrian
This code demonstrates the principle better.
Is this "Prototyping"?
using System;
using System.Collections;
namespace trial_two
{
public class Class1
{
static void Main(string[] args)
{
HashArray ha = new HashArray();
ha[1] = new Display(22,33);;
ha[2] = new Display(44,55);;
for(int i = 1 ; i < 3; i++)
Console.WriteLine("{0}, {1}",ha.arg1, ha.arg2);
}
}
public class HashArray
{
public Hashtable hash = new Hashtable();
public Display this[int loc]
{
get
{
return hash[loc] as Display;
}
set
{
hash.Add(loc, value);
}
}
}
public class Display
{
public int arg1;
public int arg2;
public Display(int arg1, int arg2)
{
this.arg1 = arg1;
this.arg2 = arg2;
}
}
}
Is this "Prototyping"?
using System;
using System.Collections;
namespace trial_two
{
public class Class1
{
static void Main(string[] args)
{
HashArray ha = new HashArray();
ha[1] = new Display(22,33);;
ha[2] = new Display(44,55);;
for(int i = 1 ; i < 3; i++)
Console.WriteLine("{0}, {1}",ha.arg1, ha.arg2);
}
}
public class HashArray
{
public Hashtable hash = new Hashtable();
public Display this[int loc]
{
get
{
return hash[loc] as Display;
}
set
{
hash.Add(loc, value);
}
}
}
public class Display
{
public int arg1;
public int arg2;
public Display(int arg1, int arg2)
{
this.arg1 = arg1;
this.arg2 = arg2;
}
}
}
J
Jon Skeet [C# MVP]
Adrian said:This code demonstrates the principle better.
Is this "Prototyping"?
Prototyping is just writing a quick test program without going through
all the proper error handling, localization etc, just to test whether
or not a concept or technology works.
J
Jon Skeet [C# MVP]
Adrian said:John, would the code below represent "cloning"?
Not really - I'm not sure which bit of it you'd call cloning.
Note that you don't need the cast to Display when you call show(), as
the HashArray indexer is of type Display.
A
Adrian
Is any abstract class a prototype?
Jon Skeet said:Prototyping is just writing a quick test program without going through
all the proper error handling, localization etc, just to test whether
or not a concept or technology works.
J
Jon Skeet [C# MVP]
Adrian said:Is any abstract class a prototype?
Not in the way I normally use the word, no. Others use the word that
way sometimes though. I tend to find it brings too much confusion, so I
stick with prototype meaning "early testing version" and use "abstract
class" when I mean abstract class.
A
Adrian
Thank you John.
Adrian.
Adrian.
Jon Skeet said:Not in the way I normally use the word, no. Others use the word that
way sometimes though. I tend to find it brings too much confusion, so I
stick with prototype meaning "early testing version" and use "abstract
class" when I mean abstract class.
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