SharePoint Integration

Re: NullReferenceException Error

Gagan — Wed, 10 Jun 2009 13:40:50 GMT

i see. i did try using that, along with "NOT" but i get the following error.

"Error 1 Operator '<>' is not defined for types 'System.Xml.XPath.XPathNavigator' and 'System.Xml.XPath.XPathNavigator'."

thank you again for helping me through this

Re: NullReferenceException Error

swathip — Wed, 10 Jun 2009 13:36:17 GMT

Hi,

You are using != in the code. Use <> instead of this. This what they explained in that link.

Re: NullReferenceException Error

Gagan — Wed, 10 Jun 2009 13:26:05 GMT

I'm not sure how that helps? That forum post you have linked is for checking if somethign is not something, in my case i am checking if it is something correct? something being "Nothing". please correct me if i am wrong, i am pretty new to visual basic, and coding in general.

Thanks for the quick response!

Re: NullReferenceException Error

swathip — Wed, 10 Jun 2009 13:12:01 GMT

Hi,

Once go through the below link.

http://www.xtremevbtalk.com/showthread.php?t=146950

Re: NullReferenceException Error

Gagan — Wed, 10 Jun 2009 13:08:03 GMT

Hi, thank you so much for the response, i re-wrote the code a little, like this...

If (root.SelectSingleNode("my:myFields/my:Time", NamespaceManager) != Nothing) Then

Dim todaystime As String = root.SelectSingleNode("my:myFields/my:Time", NamespaceManager).InnerXml

End If

but it is giving me an error under the "=" in "!=" saying "Identifyer expected" any idea why?

Re: NullReferenceException Error

swathip — Wed, 10 Jun 2009 05:37:04 GMT

Hi,

Once verify root.SelectSingleNode("my:myFields/my:Time", NamespaceManager) is null or not. In your case it is null I think. Use the below code.

If(root.SelectSingleNode("my:myFields/my:Time", NamespaceManager) != null)

{

Dim todaystime As String = root.SelectSingleNode("my:myFields/my:Time", NamespaceManager).InnerXml;
}

NullReferenceException Error

Gagan — Mon, 08 Jun 2009 14:05:42 GMT

Hi there,

I have some code which updates a xml file with the values entered into my form, and then shot over to a custom sharepoint list. the problem is i keep getting a "NullReferenceException was unhandled by user code" error. when i debug it, it tells me "Object reference not set to an instance of an object." but the weird thing is, it only happens with my time imput, my date seems to update the list just fine. here is my code...

the debug error occurs on the "Dim todaystime As String...." line, also i have tried changing innerxml to value, but it did not work.

Dim root As XPathNavigator = MainDataSource.CreateNavigator()

Dim todaysdate As String = root.SelectSingleNode("my:myFields/my:Date", NamespaceManager).Value

Dim todaystime As String = root.SelectSingleNode("my:myFields/my:Time", NamespaceManager).InnerXml

Dim batch As XPathNavigator = DataSources("AddListItem").CreateNavigator()

batch.SelectSingleNode("/Batch/Method/Field[@Name='Date']", NamespaceManager).SetValue(todaysdate)

batch.SelectSingleNode("/Batch/Method/Field[@Name='Time']", NamespaceManager).SetValue(todaystime)

DataConnections("WebServiceSubmit").Execute()