Wrox Programmer Forums

Need to download code?

View our list of code downloads.

Go Back   Wrox Programmer Forums > ASP.NET and ASP > ASP.NET 1.0 and 1.1 > ASP.NET 1.0 and 1.1 Basics
Password Reminder
Register
Register | FAQ | Members List | Calendar | Search | Today's Posts | Mark Forums Read
ASP.NET 1.0 and 1.1 Basics ASP.NET discussion for users new to coding in ASP.NET 1.0 or 1.1. NOT for the older "classic" ASP 3 or the newer ASP.NET 2.0.
Welcome to the p2p.wrox.com Forums.

You are currently viewing the ASP.NET 1.0 and 1.1 Basics section of the Wrox Programmer to Programmer discussions. This is a community of tens of thousands of software programmers and website developers including Wrox book authors and readers. As a guest, you can read any forum posting. By joining today you can post your own programming questions, respond to other developers’ questions, and eliminate the ads that are displayed to guests. Registration is fast, simple and absolutely free .
DRM-free e-books 300x50
 
 
Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old November 21st, 2004, 04:03 PM
Registered User
 
Join Date: Nov 2004
Location: , , .
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default "Specified cast is not valid" help

Could anyone tell me why this does NOT work...

Code:
if (((int) Data.ExecuteAggregate(sqlUserAuth)) == 1)
Data.ExecuteAggregate is a function that will return an object. I cast it to an int but errors out with "System.InvalidCastException: Specified cast is not valid."

The altered code below DOES work though...

Code:
if (Convert.ToInt32(Data.ExecuteAggregate(sqlUserAuth)) == 1)
I've tried to look for limitations with casting but have not found any.

Thanks in advance for your help!
  #2 (permalink)  
Old November 22nd, 2004, 09:21 AM
Friend of Wrox
 
Join Date: Jun 2003
Location: , , USA.
Posts: 1,111
Thanks: 0
Thanked 3 Times in 3 Posts
Default

When you use Convert.Toxxx it coverts it to a .NET datatype. (int) converts it to an Integer datatype in C# if I have read correctly.

  #3 (permalink)  
Old November 23rd, 2004, 12:12 PM
planoie's Avatar
Friend of Wrox
Points: 16,481, Level: 55
Points: 16,481, Level: 55 Points: 16,481, Level: 55 Points: 16,481, Level: 55
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Aug 2003
Location: Clifton Park, New York, USA.
Posts: 5,407
Thanks: 0
Thanked 16 Times in 16 Posts
Default

From what I have experienced... You can cast from similar types. So in this case you could cast from a double, single, float, etc to an int. But if you want to convert (note the keyword) you need to use the Convert class methods like you have found.
 


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Specified cast is not valid. ayem Visual Studio 2008 1 September 8th, 2008 09:15 PM
Specified cast is not valid. Jose P C# 5 May 11th, 2007 08:04 AM
Specified cast is not valid surajb Crystal Reports 0 January 12th, 2007 02:03 PM
Specified cast is not valid. abstar BOOK: ASP.NET Website Programming Problem-Design-Solution 2 March 31st, 2005 03:00 PM



All times are GMT -4. The time now is 11:46 PM.


Powered by vBulletin®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
© 2013 John Wiley & Sons, Inc.