Nullable Integer ? (working with linq)

Question

I've got exception about convert NULL to Int32.

I've got a table from database with nullable tinyint

[Column(Storage="_StatType", DbType="tinyint NULL")]
public StatType : int { get { _StatType; } }

(to get C# code just replace variable's type)

and after making linq select

def StartLinq = linq <#from lpi in _CfgListParIzm
    where lpi.ID_ListParIzm==drr1
    select (lpi.StatType)
#> ;

StartLinq.ToArray()[0] can't be readed if that is null :-/

mutable STT : int = 0;
try
{
    _=int.TryParse(StartLinq.ToArray()[0].ToString(), out STT);
}
catch { | _ is Exception => () /* I don't care*/ }

upper code is very poor trick :( I wont use it.

the question is about null-able integer. and I don't hope to get Nemerle answer. But maybe I do wrong :-/ — cnd
– cnd, Commented Mar 23, 2010 at 9:48
@Peter - it is sort of C#. It's also mixed with nemerle nemerle.org — Mike Two
– Mike Two, Commented Mar 23, 2010 at 9:49
Nullable types is not C# specific, its a feature of the .Net Framework. Ohwell, seems @nCdy got it right... — Peter Lillevold
– Peter Lillevold, Commented Mar 23, 2010 at 10:06

Jon Skeet · Accepted Answer · 2010-03-23 09:44:38Z

1

I don't know nemerle, but in C# you would make StatType a nullable integer (Nullable<int> aka int?) instead of a non-nullable one. That's the most logical solution - does nemerle support nullable value types?

answered Mar 23, 2010 at 9:44

Jon Skeet

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