Can't assign values to array

  • Thread starter Thread starter Buddy Ackerman
  • Start date Start date
B

Buddy Ackerman

I created a simple class:

Public Class MyTestClass
Public Test() As String
End Class



I tried to assign some values to the array Test() and display them like this:


Dim clsTest As New MyTestClass
Dim r As String

clsTest.Test.SetValue("First Item", 0)
clsTest.Test.SetValue("Second Item", 1)
clsTest.Test.SetValue("Third Item", 2)
clsTest.Test.SetValue("Fourth Item", 3)
clsTest.Test.SetValue("Fifth Item", 4)

For Each r in clsTest.Test
response.write(r & "<br>")
Next


I get an "Object reference not set to an instance of an object." exception on
the line 'clsTest.Test.SetValue("First Item", 0)'.

I don't understand why. WTF.


--Buddy
 
When you get this runtime-error, there is some problem with an object
reference that is not initialized.
In your case, the problem is inside your "MyTestClass". The public member
"Test()" defines a variable that
refers to an array of strings, but in your code, the array is never
initialized.
If you change your code to the listing below, your code should work just
fine.

Public Class MyTestClass
Public Test(4) As String
End Class

Hope this helps.
Tor Bådshaug
tor.badshaug [//at\\] bekk.no.
 
That's a little strange because the example that I posted was based on an example class that was autogenerated from the
SOAP Proxy Class Wizard in WebMatrix. Here is the class:


<System.Xml.Serialization.XmlTypeAttribute([Namespace]:="urn:crmondemand/ws/lead/")> _
Public Class LeadWS_LeadInsert_Input

'<remarks/>
<System.Xml.Serialization.XmlArrayAttribute([Namespace]:="urn:/crmondemand/xml/lead"), _
System.Xml.Serialization.XmlArrayItemAttribute([Namespace]:="urn:/crmondemand/xml/lead", IsNullable:=false)> _
Public ListOfLead() As Lead1
End Class



So, how would you add a lead to the ListOfLead() array?



--Buddy

When you get this runtime-error, there is some problem with an object
reference that is not initialized.
In your case, the problem is inside your "MyTestClass". The public member
"Test()" defines a variable that
refers to an array of strings, but in your code, the array is never
initialized.
If you change your code to the listing below, your code should work just
fine.

Public Class MyTestClass
Public Test(4) As String
End Class

Hope this helps.
Tor Bådshaug
tor.badshaug [//at\\] bekk.no.

I created a simple class:

Public Class MyTestClass
Public Test() As String
End Class



I tried to assign some values to the array Test() and display them like
this:


Dim clsTest As New MyTestClass
Dim r As String

clsTest.Test.SetValue("First Item", 0)
clsTest.Test.SetValue("Second Item", 1)
clsTest.Test.SetValue("Third Item", 2)
clsTest.Test.SetValue("Fourth Item", 3)
clsTest.Test.SetValue("Fifth Item", 4)

For Each r in clsTest.Test
response.write(r & "<br>")
Next


I get an "Object reference not set to an instance of an object." exception
on

the line 'clsTest.Test.SetValue("First Item", 0)'.

I don't understand why. WTF.


--Buddy
Click to expand...
Click to expand...
 
There are definitely other options besides the one i mentioned.
Just make sure that in one way or the other, that the variable references an
instantiated array object before it is used.
Public ListOfLead() simply declares it. Using "ListOfLead(4)" instantiates
the array object (an array with 5 elements - each element is Nothing, but
the array itself is no longer Nothing).

So, another approach to your code may be to ensure that the array is
initialized from outside the class

clsTest.Test = New String() {"First Item", "Second Item", "Third Item",
"Fourth Item", "Fifth Item"}

Analogously I would use code to add a lead to the ListOfLead-array (assuming
parameter-less constructor of the classes involved).

Dim leadInput As New LeadWS_LeadInsert_Input
leadInput.ListOfLead = New Lead1() { new Lead1 }

If you want to add a new Lead1 object to the array at the end of a current
array (if an initialized and non-empty array already exists), you will have
to add some logic to handle that. (However, there are other datastructures
that
are more appropriate for this.

Hope this helps.

Tor Bådshaug
tor.badshaug [//at\\] bekk.no.

Buddy Ackerman said:
That's a little strange because the example that I posted was based on an
Click to expand...
example class that was autogenerated from the
SOAP Proxy Class Wizard in WebMatrix. Here is the class:
Click to expand...
<System.Xml.Serialization.XmlTypeAttribute([Namespace]:="urn:crmondemand/ws/
lead/")> _
Public Class LeadWS_LeadInsert_Input

'<remarks/>
Click to expand...
<System.Xml.Serialization.XmlArrayAttribute([Namespace]:="urn:/crmondemand/x
ml/lead"), _System.Xml.Serialization.XmlArrayItemAttribute([Namespace]:="urn:/crmondeman
d/xml/lead", IsNullable:=false)> _
Public ListOfLead() As Lead1
End Class



So, how would you add a lead to the ListOfLead() array?



--Buddy

When you get this runtime-error, there is some problem with an object
reference that is not initialized.
In your case, the problem is inside your "MyTestClass". The public member
"Test()" defines a variable that
refers to an array of strings, but in your code, the array is never
initialized.
If you change your code to the listing below, your code should work just
fine.

Public Class MyTestClass
Public Test(4) As String
End Class

Hope this helps.
Tor Bådshaug
tor.badshaug [//at\\] bekk.no.

I created a simple class:

Public Class MyTestClass
Public Test() As String
End Class



I tried to assign some values to the array Test() and display them like
this:


Dim clsTest As New MyTestClass
Dim r As String

clsTest.Test.SetValue("First Item", 0)
clsTest.Test.SetValue("Second Item", 1)
clsTest.Test.SetValue("Third Item", 2)
clsTest.Test.SetValue("Fourth Item", 3)
clsTest.Test.SetValue("Fifth Item", 4)

For Each r in clsTest.Test
response.write(r & "<br>")
Next


I get an "Object reference not set to an instance of an object."
Click to expand...
exception

on
the line 'clsTest.Test.SetValue("First Item", 0)'.

I don't understand why. WTF.


--Buddy
Click to expand...
Click to expand...
Click to expand...
 
Thanks that worked for initializing an array but how do I add to an alrady initialized array? That is going to be what
I need to do most. Why doesn't System.Array have an append or add method (seems like an obvious need to me)?


--Buddy

There are definitely other options besides the one i mentioned.
Just make sure that in one way or the other, that the variable references an
instantiated array object before it is used.
Public ListOfLead() simply declares it. Using "ListOfLead(4)" instantiates
the array object (an array with 5 elements - each element is Nothing, but
the array itself is no longer Nothing).

So, another approach to your code may be to ensure that the array is
initialized from outside the class

clsTest.Test = New String() {"First Item", "Second Item", "Third Item",
"Fourth Item", "Fifth Item"}

Analogously I would use code to add a lead to the ListOfLead-array (assuming
parameter-less constructor of the classes involved).

Dim leadInput As New LeadWS_LeadInsert_Input
leadInput.ListOfLead = New Lead1() { new Lead1 }

If you want to add a new Lead1 object to the array at the end of a current
array (if an initialized and non-empty array already exists), you will have
to add some logic to handle that. (However, there are other datastructures
that
are more appropriate for this.

Hope this helps.

Tor Bådshaug
tor.badshaug [//at\\] bekk.no.

That's a little strange because the example that I posted was based on an
Click to expand...

example class that was autogenerated from the
SOAP Proxy Class Wizard in WebMatrix. Here is the class:
Click to expand...

<System.Xml.Serialization.XmlTypeAttribute([Namespace]:="urn:crmondemand/ws/
lead/")> _
Public Class LeadWS_LeadInsert_Input

'<remarks/>
Click to expand...
<System.Xml.Serialization.XmlArrayAttribute([Namespace]:="urn:/crmondemand/x
ml/lead"), _

System.Xml.Serialization.XmlArrayItemAttribute([Namespace]:="urn:/crmondeman
d/xml/lead", IsNullable:=false)> _
Public ListOfLead() As Lead1
End Class



So, how would you add a lead to the ListOfLead() array?



--Buddy

When you get this runtime-error, there is some problem with an object
reference that is not initialized.
In your case, the problem is inside your "MyTestClass". The public
Click to expand...
member
"Test()" defines a variable that
refers to an array of strings, but in your code, the array is never
initialized.
If you change your code to the listing below, your code should work just
fine.

Public Class MyTestClass
Public Test(4) As String
End Class

Hope this helps.
Tor Bådshaug
tor.badshaug [//at\\] bekk.no.



I created a simple class:

Public Class MyTestClass
Public Test() As String
End Class



I tried to assign some values to the array Test() and display them like

this:


Dim clsTest As New MyTestClass
Dim r As String

clsTest.Test.SetValue("First Item", 0)
clsTest.Test.SetValue("Second Item", 1)
clsTest.Test.SetValue("Third Item", 2)
clsTest.Test.SetValue("Fourth Item", 3)
clsTest.Test.SetValue("Fifth Item", 4)

For Each r in clsTest.Test
response.write(r & "<br>")
Next


I get an "Object reference not set to an instance of an object."
Click to expand...
exception
on


the line 'clsTest.Test.SetValue("First Item", 0)'.

I don't understand why. WTF.


--Buddy
Click to expand...
Click to expand...
Click to expand...
 
Hello Buddy,

If you need to add to an array, why not use an ArrayList type instead. It
has the methods you seek.

--- Nick

Buddy Ackerman said:
Thanks that worked for initializing an array but how do I add to an alrady
Click to expand...
initialized array? That is going to be what
I need to do most. Why doesn't System.Array have an append or add method
Click to expand...
(seems like an obvious need to me)?
--Buddy

There are definitely other options besides the one i mentioned.
Just make sure that in one way or the other, that the variable references an
instantiated array object before it is used.
Public ListOfLead() simply declares it. Using "ListOfLead(4)" instantiates
the array object (an array with 5 elements - each element is Nothing, but
the array itself is no longer Nothing).

So, another approach to your code may be to ensure that the array is
initialized from outside the class

clsTest.Test = New String() {"First Item", "Second Item", "Third Item",
"Fourth Item", "Fifth Item"}

Analogously I would use code to add a lead to the ListOfLead-array (assuming
parameter-less constructor of the classes involved).

Dim leadInput As New LeadWS_LeadInsert_Input
leadInput.ListOfLead = New Lead1() { new Lead1 }

If you want to add a new Lead1 object to the array at the end of a current
array (if an initialized and non-empty array already exists), you will have
to add some logic to handle that. (However, there are other datastructures
that
are more appropriate for this.

Hope this helps.

Tor Bådshaug
tor.badshaug [//at\\] bekk.no.

That's a little strange because the example that I posted was based on
Click to expand...
an

example class that was autogenerated from the
SOAP Proxy Class Wizard in WebMatrix. Here is the class:
Click to expand...

<System.Xml.Serialization.XmlTypeAttribute([Namespace]:="urn:crmondemand/ws/
lead/")> _
Public Class LeadWS_LeadInsert_Input

'<remarks/>
Click to expand...
<System.Xml.Serialization.XmlArrayAttribute([Namespace]:="urn:/crmondemand/x
ml/lead"), _

System.Xml.Serialization.XmlArrayItemAttribute([Namespace]:="urn:/crmondeman
d/xml/lead", IsNullable:=false)> _
Public ListOfLead() As Lead1
End Class



So, how would you add a lead to the ListOfLead() array?



--Buddy


Tor Bådshaug wrote:

When you get this runtime-error, there is some problem with an object
reference that is not initialized.
In your case, the problem is inside your "MyTestClass". The public
member

"Test()" defines a variable that
refers to an array of strings, but in your code, the array is never
initialized.
If you change your code to the listing below, your code should work just
fine.

Public Class MyTestClass
Public Test(4) As String
End Class

Hope this helps.
Tor Bådshaug
tor.badshaug [//at\\] bekk.no.



I created a simple class:

Public Class MyTestClass
Public Test() As String
End Class



I tried to assign some values to the array Test() and display them like

this:


Dim clsTest As New MyTestClass
Dim r As String

clsTest.Test.SetValue("First Item", 0)
clsTest.Test.SetValue("Second Item", 1)
clsTest.Test.SetValue("Third Item", 2)
clsTest.Test.SetValue("Fourth Item", 3)
clsTest.Test.SetValue("Fifth Item", 4)

For Each r in clsTest.Test
response.write(r & "<br>")
Next


I get an "Object reference not set to an instance of an object."
exception

on


the line 'clsTest.Test.SetValue("First Item", 0)'.

I don't understand why. WTF.


--Buddy
Click to expand...
Click to expand...
Click to expand...
 
The class wasn't created by me it was auto generated by the WebServices Proxy Class wizard. I'm just trying to figure
out how to use it.


--Buddy


Nick said:
Hello Buddy,

If you need to add to an array, why not use an ArrayList type instead. It
has the methods you seek.

--- Nick

Thanks that worked for initializing an array but how do I add to an alrady
Click to expand...

initialized array? That is going to be what
I need to do most. Why doesn't System.Array have an append or add method
Click to expand...

(seems like an obvious need to me)?
--Buddy
Click to expand...

references an
instantiated array object before it is used.
Public ListOfLead() simply declares it. Using "ListOfLead(4)"
Click to expand...
instantiates
the array object (an array with 5 elements - each element is Nothing,
Click to expand...
but
the array itself is no longer Nothing).

So, another approach to your code may be to ensure that the array is
initialized from outside the class

clsTest.Test = New String() {"First Item", "Second Item", "Third Item",
"Fourth Item", "Fifth Item"}

Analogously I would use code to add a lead to the ListOfLead-array
Click to expand...
(assuming
parameter-less constructor of the classes involved).

Dim leadInput As New LeadWS_LeadInsert_Input
leadInput.ListOfLead = New Lead1() { new Lead1 }

If you want to add a new Lead1 object to the array at the end of a
Click to expand...
current
array (if an initialized and non-empty array already exists), you will
Click to expand...
have
to add some logic to handle that. (However, there are other
Click to expand...
datastructures
that
are more appropriate for this.

Hope this helps.

Tor Bådshaug
tor.badshaug [//at\\] bekk.no.



That's a little strange because the example that I posted was based on
Click to expand...
an
example class that was autogenerated from the


SOAP Proxy Class Wizard in WebMatrix. Here is the class:
Click to expand...
<System.Xml.Serialization.XmlTypeAttribute([Namespace]:="urn:crmondemand/ws/
lead/")> _


Public Class LeadWS_LeadInsert_Input

'<remarks/>
Click to expand...
<System.Xml.Serialization.XmlArrayAttribute([Namespace]:="urn:/crmondemand/x
ml/lead"), _
Click to expand...
System.Xml.Serialization.XmlArrayItemAttribute([Namespace]:="urn:/crmondeman
d/xml/lead", IsNullable:=false)> _


Public ListOfLead() As Lead1
End Class



So, how would you add a lead to the ListOfLead() array?



--Buddy


Tor Bådshaug wrote:


When you get this runtime-error, there is some problem with an object
reference that is not initialized.
In your case, the problem is inside your "MyTestClass". The public

member


"Test()" defines a variable that
refers to an array of strings, but in your code, the array is never
initialized.
If you change your code to the listing below, your code should work
Click to expand...
just
fine.

Public Class MyTestClass
Public Test(4) As String
End Class

Hope this helps.
Tor Bådshaug
tor.badshaug [//at\\] bekk.no.




I created a simple class:

Public Class MyTestClass
Public Test() As String
End Class



I tried to assign some values to the array Test() and display them
Click to expand...
like
this:



Dim clsTest As New MyTestClass
Dim r As String

clsTest.Test.SetValue("First Item", 0)
clsTest.Test.SetValue("Second Item", 1)
clsTest.Test.SetValue("Third Item", 2)
clsTest.Test.SetValue("Fourth Item", 3)
clsTest.Test.SetValue("Fifth Item", 4)

For Each r in clsTest.Test
response.write(r & "<br>")
Next


I get an "Object reference not set to an instance of an object."

exception


on



the line 'clsTest.Test.SetValue("First Item", 0)'.

I don't understand why. WTF.


--Buddy
Click to expand...
Click to expand...
Click to expand...
 
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