Simple Unboxing Question

[Robert W.]

I have a situation where I have pairs of strings that I want to put into an
ArrayList and then later pull out of it.

To keep things simple I tried this to put them in:

arrayList.Add(n ew object[] {stringA, stringB});


That works fine. But I can't figure out how to unbox them into their
constituent components. Might anyone know a way? Or am I forced to create
simple class to define the object that the strings will initially be placed
into?

--
Robert W.
Vancouver, BC

https://www.mwtech.com

[Zeya]

Re: Simple Unboxing Question

for ( int i = 0; i < arrayList.lengt h; i++ )
{
object TempObject[] = arrayList [ i ];
for ( int j=0; j< TempObject.leng th; j++ )
{
console.writeli ne ( "i " + i + " j: " + (string)TempObj ect[ j ]
);
//or do whatever you want to do with each entry.
}

}

[Robert W.]

Re: Simple Unboxing Question

But Zeya, this only pulls one string out of the object. There are actually
two strings in every object element in the ArrayList.

Or am I missing something?

--
Robert W.
Vancouver, BC

https://www.mwtech.com

"Zeya" wrote:
[color=blue]
> for ( int i = 0; i < arrayList.lengt h; i++ )
> {
> object TempObject[] = arrayList [ i ];
> for ( int j=0; j< TempObject.leng th; j++ )
> {
> console.writeli ne ( "i " + i + " j: " + (string)TempObj ect[ j ]
> );
> //or do whatever you want to do with each entry.
> }
>
> }
>
>[/color]

[Bill Butler]

Re: Simple Unboxing Question

"Robert W." <RobertW@discus sions.microsoft .com> wrote in message
news:C3DECE83-636D-4AB5-9F86-FBBA22D8D742@mi crosoft.com...[color=blue]
>I have a situation where I have pairs of strings that I want to put into an
> ArrayList and then later pull out of it.
>
> To keep things simple I tried this to put them in:
>
> arrayList.Add(n ew object[] {stringA, stringB});
>
>
> That works fine. But I can't figure out how to unbox them into their
> constituent components. Might anyone know a way? Or am I forced to create
> simple class to define the object that the strings will initially be placed
> into?[/color]

Hi,

You don't need to use an Array of object. You can use a string array instead.

Anyway... here is a sample program

using System;
using System.Collecti ons;

class Test
{
public static void Main()
{
string[] pair1 = {"happy","Birth day"};
string[] pair2 = {"Peanut butter","Jelly" };
string[] pair3 = {"Good","Evil"} ;

// Fill ArrayList
ArrayList list = new ArrayList();
list.Add(pair1) ;
list.Add(pair2) ;
list.Add(pair3) ;


foreach(string[] pair in list)
{
Console.WriteLi ne("{0} AND {1}",pair[0], pair[1]);
}
}
}

OUTPUT
---------------------
happy AND Birthday
Peanut butter AND Jelly
Good AND Evil

Hope this helps
Bill

[Zeya]

Re: Simple Unboxing Question

There could be two reasons:
1. If you did not correct my typo ( I am not sure if this even compiles
this way)
2. The loop index.

Try following:

for ( int i = 0; i < arrayList.lengt h; i++ )
{
object[] TempObject = arrayList [ i ]; &larr;
for ( int j=0; j< TempObject.leng th; j++ ) &larr; change j <=
TempObject.leng th
{
console.writeli ne ( "i " + i + " j: " + (string)TempObj ect[ j ]
);
//or do whatever you want to do with each entry.
}

HTH

[Ashura]

RE: Simple Unboxing Question

wud this a better idea?

using System.Collecti ons.Specialized ;

//...
NameValueCollec tion col = new NameValueCollec tion();
col.Add("key1", "value1");
string val = col["key1"];
//...

regards

[Robert W.]

Re: Simple Unboxing Question

Bill,

Yes, yes, simple but brilliant! I wish I had thought of that!

Thanks!!


--
Robert W.
Vancouver, BC

https://www.mwtech.com

"Bill Butler" wrote:
[color=blue]
> "Robert W." <RobertW@discus sions.microsoft .com> wrote in message
> news:C3DECE83-636D-4AB5-9F86-FBBA22D8D742@mi crosoft.com...[color=green]
> >I have a situation where I have pairs of strings that I want to put into an
> > ArrayList and then later pull out of it.
> >
> > To keep things simple I tried this to put them in:
> >
> > arrayList.Add(n ew object[] {stringA, stringB});
> >
> >
> > That works fine. But I can't figure out how to unbox them into their
> > constituent components. Might anyone know a way? Or am I forced to create
> > simple class to define the object that the strings will initially be placed
> > into?[/color]
>
> Hi,
>
> You don't need to use an Array of object. You can use a string array instead.
>
> Anyway... here is a sample program
>
> using System;
> using System.Collecti ons;
>
> class Test
> {
> public static void Main()
> {
> string[] pair1 = {"happy","Birth day"};
> string[] pair2 = {"Peanut butter","Jelly" };
> string[] pair3 = {"Good","Evil"} ;
>
> // Fill ArrayList
> ArrayList list = new ArrayList();
> list.Add(pair1) ;
> list.Add(pair2) ;
> list.Add(pair3) ;
>
>
> foreach(string[] pair in list)
> {
> Console.WriteLi ne("{0} AND {1}",pair[0], pair[1]);
> }
> }
> }
>
> OUTPUT
> ---------------------
> happy AND Birthday
> Peanut butter AND Jelly
> Good AND Evil
>
> Hope this helps
> Bill
>
>
>[/color]