arrays again

[Eric Eggermann]

Thanks for the help last week, but I've got a new problem with a different
array now.....sigh.
I want to use an ArrayList to hold unique integer arrays. I've written a
comparer class which works when I call the function explicitly, but when I
use the Sort and BinarySearch functions of my ArrayList object I get
InvalidCast exceptions.

public int Compare(object x, object y)
{
return Compare((Array)x, (Array)y); //InvalidCast exception here
}
public int Compare(Array x, Array y)
{
.... comparison code here is working....
}

Of course, the ArrayList only contains int[] arrays. Also, the above code is
just one of many equally useless tries I've had at this. How do I cast
between an object reference and an array of ints, so that I can use my
comparer with ArrayList.Sort and BinarySearch functions?

All ideas well appreciated,
Eric

[Jon Skeet [C# MVP]]

<"Eric Eggermann" <<none>>> wrote:

Thanks for the help last week, but I've got a new problem with a different
array now.....sigh.
I want to use an ArrayList to hold unique integer arrays. I've written a
comparer class which works when I call the function explicitly, but when I
use the Sort and BinarySearch functions of my ArrayList object I get
InvalidCast exceptions.

public int Compare(object x, object y)
{
return Compare((Array)x, (Array)y); //InvalidCast exception here
}
public int Compare(Array x, Array y)
{
.... comparison code here is working....
}

Of course, the ArrayList only contains int[] arrays. Also, the above code is
just one of many equally useless tries I've had at this. How do I cast
between an object reference and an array of ints, so that I can use my
comparer with ArrayList.Sort and BinarySearch functions?

Could you post a short but complete program which demonstrates the
problem?

See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Nicholas Paldino [.NET/C# MVP]]

Eric,

Place a break in the debugger, and see what the types of the variables x
and y actually are. You might find that it is something you didn't expect.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Eric Eggermann >" <<none> wrote in message
news:uL****************@tk2msftngp13.phx.gbl...

Thanks for the help last week, but I've got a new problem with a different
array now.....sigh.
I want to use an ArrayList to hold unique integer arrays. I've written a
comparer class which works when I call the function explicitly, but when I
use the Sort and BinarySearch functions of my ArrayList object I get
InvalidCast exceptions.

public int Compare(object x, object y)
{
return Compare((Array)x, (Array)y); //InvalidCast exception here
}
public int Compare(Array x, Array y)
{
.... comparison code here is working....
}

Of course, the ArrayList only contains int[] arrays. Also, the above code is just one of many equally useless tries I've had at this. How do I cast
between an object reference and an array of ints, so that I can use my
comparer with ArrayList.Sort and BinarySearch functions?

All ideas well appreciated,
Eric

[Eric Eggermann]

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in
message news:eb**************@tk2msftngp13.phx.gbl...

Eric,

Place a break in the debugger, and see what the types of the variables x and y actually are. You might find that it is something you didn't

expect.

I have, and I find that both x, and y in Compare(object x, object y) are
System.Int32. Didn't really expect that. And the GetType().IsArray returns
false. So I'm still confused.
Eric

[Eric Eggermann]

"Jon Skeet [C# MVP]" <sk***@pobox.com> wrote in message
news:MP************************@msnews.microsoft.c om...

Could you post a short but complete program which demonstrates the
problem?

While putting that demo program together, the silly thing seemed to work.
Still doesn't work in the place where I actually need it, but the problem
seems to be somewhere else. Got some work to do.

Thanks for the help, and I'll post that program when I manage to figure out
where the problem lies.

Eric