I eventually found it Nic. Was a problem of refactoring code into a base class
and inheriting from it.
class A
{
private CreditCard creditCard;
protected void Function()
{
string name = this.creditCard.FirstName;
}
}
class B : A
{
private CreditCard creditCard;
private void SomeMethod()
{
this.creditCard = new CreditCard();
this.Function();
}
}
If you break in "Function" with the above code, MonoDevelop reports that
"this.creditCard" is a valid object via the hover tips etc, but in reality it's
null. That's what got me.
In refactoring my code, I had not noticed the member variable in class B of the
same name.
Dino
-----Original Message-----
From: Nic Wise [mailto:[email protected]]
Sent: Thursday, August 30, 2012 09:00
To: Dean Cleaver
Cc: [email protected]
Subject: Re: [MonoTouch] Weird NullReference problem
What happens if you do
postValues.Add("x_zip", this.zip);
postValues.Add("x_first_name", this.creditCard.FirstName);
?
On Thu, Aug 30, 2012 at 2:28 PM, Dean Cleaver
<[email protected]> wrote:
> I'm stumped. The second line of code is failing with a null reference
> exception...
>
> postValues["x_zip"] = this.zip;
> postValues["x_first_name"] = "" + this.creditCard.FirstName;
>
> "this.creditCard" is valid. "this.creditCard.FirstName" is "DA". But
> that line returns a null reference exception.
>
> How?
>
> postValues cannot be null or the previous line would have failed. It
> is a hashtable, so it allows setting of values in this manner.
>
>
>
> Any ideas what could be causing a null reference exception?
>
>
>
> Dino
>
>
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>
--
Nic Wise
t. +44 7788 592 806 | @fastchicken | http://www.linkedin.com/in/nicwise
b. http://www.fastchicken.co.nz/
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