Help with Convert.ToDateTime(String) error

08-28-2006, 05:12 AM

cosmosis

Centurion

Join Date: Jan 2004

Location: norway

Posts: 156

Help with Convert.ToDateTime(String) error

I'm just so confused here..

I run my application, do some stuff, call a sub which contains this line:

Code:

aParallel.StartDate = Convert.ToDateTime(stringReportStart)

...and everything works fine

However, the NEXT time this sub is called, with the EXACT same data input, an exception (described below) is throwed on the line above. Why? It worked the first time!?

If I exit the program and run it again - same thing; it works the first time, but next time it's all baluba.

Please help

Code:

************** Exception Text **************
System.FormatException: String was not recognized as a valid DateTime.
   at System.DateTimeParse.GetDayOfNNN(DateTimeResult result, DateTimeRawInfo raw, DateTimeFormatInfo dtfi)
   at System.DateTimeParse.ProcessTerminaltState(Int32 dps, DateTimeResult result, DateTimeRawInfo raw, DateTimeFormatInfo dtfi)
   at System.DateTimeParse.Parse(String s, DateTimeFormatInfo dtfi, DateTimeStyles styles)
   at System.DateTime.Parse(String s, IFormatProvider provider, DateTimeStyles styles)
   at System.DateTime.Parse(String s, IFormatProvider provider)
   at System.DateTime.Parse(String s)
   at System.Convert.ToDateTime(String value)
....

08-28-2006, 06:03 AM

Cags

Contributor

* Expert *

Join Date: Jul 2003

Location: Leicestershire, England

Posts: 710

Assumably the value of stringReportStart is being changed between the first running of the sub and the second running of the sub. If stringReportStart is not a valid DateTime then your code will crash.

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08-28-2006, 06:25 AM

cosmosis

Centurion

Join Date: Jan 2004

Location: norway

Posts: 156

well, this was the first thing i checked, and i can assure you, the data is indentical the first and second time. any other ideas?

08-28-2006, 07:22 AM

wayneph

Web Junkie

Retired Moderator
* Expert *

Join Date: Apr 2004

Location: D/FW, Texas, USA

Posts: 8,393

it sounds like code somewhere else is modifying your date. (clearing it out or something like that.) If you're truely calling it with the exact same string, it won't error.

Are you using .NET 2.0 or 1.1? If you're using 2.0, Look at the DateTime.TryParse funciton. That will automatically wrap your conversion in a Try..Catch block. I would also use DateTime.Parse instead of Convert.ToDateTime() anyhow... (regardless of version.)

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