I built this for fun for checking unsigned integers and getting bool return
plus the value if method could convert the string. Probably much faster
ways, but this works so far:
public static bool IsUInt(string str, out uint val)
{
val = 0;
if ( str == null || str.Trim() == "" )
return false;
char [] cArray = str.ToCharArray();
if ( cArray.Length > 10 || cArray.Length == 0 )
return false;
long numPlace = 1;
long num = 0;
byte b = 0;
for (int i = cArray.Length - 1; i >= 0; i--)
{
if (cArray[i] > 57 || cArray[i] < 48)
return false;
b = (byte)(cArray[i] - 48);
num = num + ( b * numPlace );
numPlace = numPlace * 10;
}
if ( num > int.MaxValue )
return false;
val = (uint)num;
return true;
}
--
William Stacey, MVP
"Reinhold Schalk" <ReiSchalk@gmx.de> wrote in message
news:uTdD7NzvDHA.1576@TK2MSFTNGP11.phx.gbl...[color=blue]
> Hi Ignacio,
> one problem with VB IsNumeric: does not explicitly check for integers.
> that means IsNumeric() does also return true, if your string is a[/color]
double(or[color=blue]
> float). that's not always what yout want.
>
> Reinhold
> (Sorry for bad english)
>
> "Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin AT dot.state.fl.us>
> schrieb im Newsbeitrag news:OpRgoJzvDHA.536@tk2msftngp13.phx.gbl...[color=green]
> > Hi William,
> >
> > AFAIK there is not such a method in the framework, what you can do is
> > include the VB.NET DLL which define a IsNumeric function.
> >
> >
> > Cheers,
> >
> > --
> > Ignacio Machin,
> > ignacio.machin AT dot.state.fl.us
> > Florida Department Of Transportation
> >
> > "William Stacey" <staceywREMOVE@mvps.org> wrote in message
> > news:%23jwCgBzvDHA.1740@TK2MSFTNGP12.phx.gbl...[color=darkred]
> > > Is there a CanConvert like method that returns a bool instead of an
> > > exception. The problem with wrapping in try is the wait time for the
> > > exception.
> > >
> > > --
> > > William Stacey, MVP
> > >
> > > "Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin AT dot.state.fl.us>[/color]
> > wrote[color=darkred]
> > > in message news:#2XwdHyvDHA.2136@TK2MSFTNGP10.phx.gbl...
> > > > Hi,
> > > >
> > > > If you are sure that the values of the dropdown are numbers you can[/color][/color]
> do[color=green][color=darkred]
> > > > like:
> > > > int val = Convert.ToInt32( DropDownControl. SelectedValue );
> > > >
> > > > If you are not then you can wrap the above line in a try/catch[/color][/color][/color]
block.[color=blue][color=green][color=darkred]
> > > >
> > > >
> > > > Cheers,
> > > >
> > > > --
> > > > Ignacio Machin,
> > > > ignacio.machin AT dot.state.fl.us
> > > > Florida Department Of Transportation
> > > >
> > > > "djozy" <anonymous@discussions.microsoft.com> wrote in message
> > > > news:10dee01c3bf1a$d28803d0$a601280a@phx.gbl...
> > > > > Please, how can I convert selected item from dropdown list
> > > > > to integer?
> > > > > Thank you
> > > >
> > > >
> > >
> > >[/color]
> >
> >[/color]
>
>[/color]
