Hi folks,
I'm trying to contact a web service from a PocketPC 2003 application. Right now I'm just using the PocketPC 2003 Emulator, and my web service's Url property is set to a real URL on my LAN - not the "localhost:1130" you get by default.
If I place this code in the "Load" event of my main form, everything works fine:
using (SitesProxy.SitesService ssvc = new SitesProxy.SitesService()) { DataSet sites = ssvc.GetSites(true); label1.Text = sites.Tables[0].Rows[0]["SiteName"].ToString(); |
The app successfully retrieves data from my "SitesService" web service and sets the label's text to the name of the first site returned. Lovely.
However, I want to wrap this logic up into a static class, like this:
static class MySite { static DataSet sites; static MySite() static DataRow Current |
(Ok, this is a dumb example, but you get the idea.)
If I then put this code into my main form's Load event:
label1.Text = MySite.Current["SiteName"].ToString(); |
... then the program simply locks up. It sits forever with the 'cursor' window (the little rotating coloured box).
Do web service calls not work from within static methods Have I missed something Any help would be greatly appreciated.
Web Services and static classes - need help :(
Gil Kozlowski
Hi Matt,
I'm investigating this and I will get back to you on this shortly.
Cheers.
Simon M
Thanks.
Darshan Pandit
I have done some further tests, and it seems that it only dies if I try to access a webmethod in a static constructor. Using "lazy loading" and accessing the webmethod in a static method or property works fine, so that's got me out of the woods for now.
I'd much rather do it in the constructor, though, and this sounds like a bug unless I'm missing something very obvious.
Cheers!
giskard73
I just knocked up a smaller application to test this. I defined two extra classes in my "Form1.cs" file:
public static class MyStaticSite
{
private static DataSet sites;
static MySite()
{
using (SitesProxy.SitesService ssvc = new DeviceApplication1.SitesProxy.SitesService())
{
sites = ssvc.GetSites(true);
}
}
public static DataRow Current
{
get { return sites.Tables[0].Rows[0]; }
}
}
public class MySite
{
private DataSet sites;
public MySite()
{
using (SitesProxy.SitesService ssvc = new DeviceApplication1.SitesProxy.SitesService())
{
sites = ssvc.GetSites(true);
}
}
public DataRow Current
{
get { return sites.Tables[0].Rows[0]; }
}
}
In my Form1.Load event I have two lines:
// label1.Text = MyStaticSite.Current["SiteName"].ToString();
label1.Text = new MySite().Current["SiteName"].ToString();
If I run that code as-is, everything works fine. If I comment out the second line and uncomment the first, the program never starts - it seems to hang on the call to ssvc.GetSites() in the static class's constructor.
This is VS.NET 2005 Beta 2; I don't know if this problem has been addressed in a later CTP. Perhaps someone out there who has a web service they can test with can confirm this as a bug or not.
Cheers,
Matt
John avis
I'll make do with a lazy-loading approach and call the web service from a static method/property instead for now. Thanks for your help, Mark. Good to know I caught a bug!