wierd error!

Hi there.

I am trying to copy a value into a string array.

However, it is not liking it - throwing me an "object reference is null" exception...

now, the wierd thing is, almost the same line(s) of code work in another class in this project, but when i try to do it in a different class, this error occurs!

the source from where i am trying to copy the value from, does have something in it. this is what im doing:

Code:

---

Dim theStringArray() as string

for x = 0 to someOtherArrayList.count - 1
  theStringArray(x) = someOtherArrayList(x).ToString() 'i have tried without the ToString()
next

---

?? whats the prob?

It looks to me like the actual object in the someOtherArrayList(x) doesn't have anything in it. The object has been created but not instantiated.

Where are you getting the data from? Is it definitely populating that array correctly?

but it does! I have debugged it, and objects exist

not sure about it, base on your code given, but try.

VB Code:

Dim theStringArray() as string
 
for x = 0 to someOtherArrayList.count - 1
   ReDim Preserve theStringArray(x)
   theStringArray(x) = someOtherArrayList(x).ToString() 'i have tried without the ToString()
next

You have not initialized the array. It is just a null reference. The object does NOT exist yet :).

Use:

VB Code:

Dim theStringArray() as string = New String(NUM) {}

Where NUM is the upper bound of the array (if you want 10 elements then NUM = 9)

Do NOT use this...

Quote:

---

Originally Posted by fret

not sure about it, base on your code given, but try.

VB Code:

Dim theStringArray() as string
 
for x = 0 to someOtherArrayList.count - 1
   ReDim Preserve theStringArray(x)
   theStringArray(x) = someOtherArrayList(x).ToString() 'i have tried without the ToString()
next

---

Redimming everytime will ruin performance and it is totally unneccesary.

However you never said which object reference was causing the error.
(Hover your mouse over the code when the app is paused and it will say "BlahBlah = Nothing" if the reference is null.

It could be the other arraylist thats not been properly filled.