[Mono-list] How do you debug?

[Ivan Hawkes]

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On Friday 04 Jul 2003 4:40 pm, Marco Canini wrote:
> On Fri, 2003-07-04 at 17:23, Ivan Hawkes wrote:
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> > Are there any indications of how long it will be before it is operation=
al
> > again?
>
> For what i know Martin, the debugger mantainer, is working hard on it,
> but i don't know when it will works again.

Oh well, they say patience is a virtue. It's going to be pretty tedious=20
without one though.=20

<SNIP>
> > Unhandled Exception: System.InvalidCastException: Cannot cast from sour=
ce
> > type to destination type
> > in <0x0007a> 00 System.Data.SqlClient.SqlDataReader:GetInt32 (int)
> > in <0x00189> 00 Interesource.Publish.Client.ContentList:.ctor
> > (System.Data.IDataReader,bool)
> > in <0x00012> 00 Interesource.Publish.Client.ContentList:.ctor
> > (System.Data.IDataReader)
> > in <0x000a2> 00
> > Interesource.Publish.Client.ContentProvider:ListContentItems
> > (Interesource.Publish.Entities.ContentTypeKey)
> > in <0x0009e> 00 simpletest.SimpleTest:Main (string[])
>
> this could be a different type mapping between mono's SqlClient and
> .net's SqlClient
>
> Could you report the table definition (sql), the datacolumn definition,
> and the code that raises the exception.

Ok, it looks like this line of code:

NOTE: These are relevant variables in code and their types.
IDataReader reader
int uniqueId;

uniqueId =3D reader.GetInt32(reader.GetOrdinal("OriginalVersionId"));

and OriginalVersionId is an Int (4) NULL in SQL (MS SQL Server 2000)

Weird, it doesn't seem to leave a lot of room for error there since the rec=
ord=20
in question has an Int value (not a NULL or anything else).


> btw, with some pain you can get some dbg information my compiling with
> /g and running with mono --debug
>
> i said with some pain because the line numbers in exception backtrace
> are many times wrong

Yeh, I've got them switched on now. At least I have decent error handling i=
n=20
this program to help me trace the offending lines.

> > Now, this code works on both Framework 1.0 and 1.1, so I'm guessing the=
re
> > is a little work needed on the type casting for Mono. Without a debugger
> > it's going to be a nightmare trying to get it all working, so I'm hoping
> > that debugger will be available again soon.
>
> we all hope so
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