I have a SQL database and some fields may be null.
This will trow an exeption:
string[] s=new string[10];
s[0]=String.Format("{0}",myReader.GetString(1));
s[1]=String.Format("{0}",myReader.GetString(2));
s[2]=String.Format("{0}",myReader.GetString(3)); // null field
s[3]=String.Format("{0}",myReader.GetString(4));
One solution is to use:
try { s[0]=String.Format("{0}",myReader.GetString(1)); }
catch {}
try { s[1]=String.Format("{0}",myReader.GetString(2)); }
catch {}
try { s[2]=String.Format("{0}",myReader.GetString(3)); }
catch {}
try { s[3]=String.Format("{0}",myReader.GetString(4)); }
catch {}
Is there a better way to solve null fields ? 3 7996
GTi <bl****@blabla.com> wrote: I have a SQL database and some fields may be null.
This will trow an exeption: string[] s=new string[10]; s[0]=String.Format("{0}",myReader.GetString(1)); s[1]=String.Format("{0}",myReader.GetString(2)); s[2]=String.Format("{0}",myReader.GetString(3)); // null field s[3]=String.Format("{0}",myReader.GetString(4)); One solution is to use:
try { s[0]=String.Format("{0}",myReader.GetString(1)); } catch {} try { s[1]=String.Format("{0}",myReader.GetString(2)); } catch {} try { s[2]=String.Format("{0}",myReader.GetString(3)); } catch {} try { s[3]=String.Format("{0}",myReader.GetString(4)); } catch {}
Is there a better way to solve null fields ?
Yes - use SqlDataReader.IsDBNull to test the columns. Do you definitely
have to read a data reader rather than a data adapter and data set?
--
Jon Skeet - <sk***@pobox.com> http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
"Jon Skeet [C# MVP]" <sk***@pobox.com> skrev i melding
news:MP************************@msnews.microsoft.c om... GTi <bl****@blabla.com> wrote: I have a SQL database and some fields may be null.
This will trow an exeption: string[] s=new string[10]; s[0]=String.Format("{0}",myReader.GetString(1)); s[1]=String.Format("{0}",myReader.GetString(2)); s[2]=String.Format("{0}",myReader.GetString(3)); // null field s[3]=String.Format("{0}",myReader.GetString(4)); One solution is to use:
try { s[0]=String.Format("{0}",myReader.GetString(1)); } catch {} try { s[1]=String.Format("{0}",myReader.GetString(2)); } catch {} try { s[2]=String.Format("{0}",myReader.GetString(3)); } catch {} try { s[3]=String.Format("{0}",myReader.GetString(4)); } catch {}
Is there a better way to solve null fields ? Yes - use SqlDataReader.IsDBNull to test the columns. Do you definitely have to read a data reader rather than a data adapter and data set?
-- Jon Skeet - <sk***@pobox.com> http://www.pobox.com/~skeet If replying to the group, please do not mail me too
Yes - use SqlDataReader.IsDBNull to test the columns.
Ok - tanks....
Do you definitely have to read a data reader rather than a data adapter and data set?
Not really, just that I have not learn to use data adapter and data set
yet...
Using data reader is familiar for me from the old C world.
So if U have a good site that explain using data adapter and data set I will
be grateful.
GTi <bl****@blabla.com> wrote: Do you definitely have to read a data reader rather than a data adapter and data set? Not really, just that I have not learn to use data adapter and data set yet... Using data reader is familiar for me from the old C world. So if U have a good site that explain using data adapter and data set I will be grateful.
Just a search for ADO.NET tutorials should find you plenty. It's very
rare that you really need to use a DataReader yourself - they're
generally worth avoiding, preferring to let the DataAdapter do the hard
work :)
--
Jon Skeet - <sk***@pobox.com> http://www.pobox.com/~skeet
If replying to the group, please do not mail me too This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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