Invalid format exception

Question

User-1507790905 posted
Hello

If I try to enter a new event and then click cancel without entering something, I receive
the following error:

Serverfehler in der Anwendung /ClubWebSite1.

---

Die Eingabezeichenfolge hat das falsche Format.

Beschreibung: Unbehandelte Ausnahme beim Ausführen der aktuellen Webanforderung. Überprüfen Sie die Stapelüberwachung, um weitere Informationen über diesen Fehler anzuzeigen und festzustellen, wo der Fehler im Code verursacht wurde.

Ausnahmedetails: System.FormatException: Die Eingabezeichenfolge hat das falsche Format.

Quellfehler:

Zeile 55: id = Request.QueryString("EventID") Zeile 56: If Not id Is Nothing Then Zeile 57: m_EventID = CInt(id) Zeile 58: Else Zeile 59: m_EventID = 1

Quelldatei: C:\...........\ClubWebSite1\Events_View.aspx    Zeile: 57

Stapelüberwachung:

[FormatException: Die Eingabezeichenfolge hat das falsche Format.] Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat) +216 Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) +93 [InvalidCastException: Ungültige Konvertierung von der Zeichenfolge in Typ Integer.] Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) +251 Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(Object Value) +1030 ASP.events_view_aspx.get_EventID() in C:\Dokumente und Einstellungen\....\ClubWebSite1\Events_View.aspx:57 ASP.events_view_aspx.Page_Load(Object sender, EventArgs e) in C:\Dokumente und Einstellungen\....\ClubWebSite1\Events_View.aspx:14 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +13 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +45 System.Web.UI.Control.OnLoad(EventArgs e) +80 System.Web.UI.Control.LoadRecursive() +49 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3730

What can I do to handle or prevent this error?

Thanks in advance,

Xerxes24

Answer 1

User1052258516 posted

Replace Lines 55-59 with this:

id = Request.QueryString("EventID")

If Not id Is Nothing Then

Try

m_EventID = DirectCast(id, Integer)

Catch

m_EventID = 1

End Try

Else

m_EventID = 1

End If

- Will
www.willyd.ca

Answer 2

User-1476513399 posted

The actual cause of this problem is as follows:

From the Events page, click on Add New Event. This takes you to the Events_edit.aspx page.

If you next click on Cancel, you will get the above error.

This is because the Cancel action is trying to go to the Events_View page when in fact it should be going to events_calendar.aspx - where you started from.

The are two places on the Events_edit.aspx page that need to be changed where the following two lines of code are - that have to do with Adding a new event:

<Club:RolloverButton ID="apply1" CommandName="Insert" Text="Add Event" runat="server" />

<Club:RolloverLink ID="Cancel" Text="Cancel" runat="server" NavigateURL='<%#

"Events_view.aspx?EventID=" & Cstr(Eval("ID"))  %>' />

The 2nd line needs to be:

<Club:RolloverLink ID="Cancel" Text="Cancel" runat="server" NavigateURL='<%#

"Events_calendar.aspx"  %>' />

Again, there are two places where these lines of code exit, because there are Add Event / Cancel buttons at the top and bottom of the page.

Now NOTE:

If you start on the Events page, and click an event link on some date, this takes you to Events_view.aspx.  Now, if you then click on Edit .. you are again on the Events_edit.aspx page. From here, if you click Cancel, it works fine (no error) because it takes you back to the Events_view.aspx page where it should ... and the ID exists (not null).

There is also another minor bug:

From the Events page, click on Add New Event.

This takes you to Events_Edit.aspx page.

Now, click on Add New Event (on this page). You get a page not found error ... because ... its trying to go to Event_edit.aspx instead of Events_edit.aspx (the 's' is missing in the first case-no doubt a typo).

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