ArrayList.ToArray() question

[Derrick]

If i have an ArrayList, add a bunch of MyClass classes to it, how do I get a
MyClass[] out of it? I've tried:

MyClass[] clses = ArrayList.ToArray(typeof(MyClass));

but get errors about not being able to cast. ?

Thanks!

Derrick

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

Derrick,

Yes, because the return type of the ToArray method is Array. You have
to cast it to (MyClass[]), like so:

MyClass[] clses = (MyClass[]) ArrayList.ToArray(typeof(MyClass));

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Derrick" <de*********@excite.com> wrote in message
news:%2****************@tk2msftngp13.phx.gbl...

If i have an ArrayList, add a bunch of MyClass classes to it, how do I get a MyClass[] out of it? I've tried:

MyClass[] clses = ArrayList.ToArray(typeof(MyClass));

but get errors about not being able to cast. ?

Thanks!

Derrick

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

You should do this inside a try/catch block as ArrayList do not check that
all the elements being of the same type.

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in
message news:eb*************@TK2MSFTNGP11.phx.gbl...

Derrick,

Yes, because the return type of the ToArray method is Array. You have
to cast it to (MyClass[]), like so:

MyClass[] clses = (MyClass[]) ArrayList.ToArray(typeof(MyClass));

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Derrick" <de*********@excite.com> wrote in message
news:%2****************@tk2msftngp13.phx.gbl...

If i have an ArrayList, add a bunch of MyClass classes to it, how do I

get a

MyClass[] out of it? I've tried:

MyClass[] clses = ArrayList.ToArray(typeof(MyClass));

but get errors about not being able to cast. ?

Thanks!

Derrick

[Jon Skeet [C# MVP]]

<"Ignacio Machin \( .NET/ C# MVP \)" <ignacio.machin AT
dot.state.fl.us>> wrote:

You should do this inside a try/catch block as ArrayList do not check that
all the elements being of the same type.

Yes it does - it *has* to when you provide a type to ToArray, otherwise
it wouldn't be able return an array of the appropriate type. So ToArray
will throw an exception if the elements aren't of an appropriate type.
Or did you mean that it doesn't check the elements when they're put
into the list?

I wouldn't suggest putting it in a try/catch block though - if that
fails, chances are you've got some nasty internal error, and the
exception should probably bubble up to a higher level.

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

[Ignacio Machin \( .NET/ C# MVP \)]

Hi ,

Yes it does - it *has* to when you provide a type to ToArray, otherwise
it wouldn't be able return an array of the appropriate type. So ToArray
will throw an exception if the elements aren't of an appropriate type.
Or did you mean that it doesn't check the elements when they're put
into the list?
When they are inserted on the list I meant.
I wouldn't suggest putting it in a try/catch block though - if that
fails, chances are you've got some nasty internal error, and the
exception should probably bubble up to a higher level.

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation