I have the following code snippet that produces a compilation error:
public List<string> batchaddresses;
public MapFiles(string [] addresses)
{
for (int i = 0; i < addresses.Count(); i++)
{
batchaddresses.AddRange(Directory.GetFiles(addresses[i], "*.esy"));
}
}
I get an error when I try to use the List<T>.AddRange() method:
Object reference not set to an instance of an object
What am I doing wrong?
Where is batchaddresses initialized?
Declaring the variable does not suffice. You must initialize it, like so:
// In your constructor
batchaddresses = new List<string>();
// Directly at declaration:
public List<string> batchaddresses = new List<string>();
you have to initialize the list
List<String> batchaddresses = new List<String>();
The batchaddresses field hasn't been initialised. You can initialise it as part of the declaration:
public List<string> batchaddresses = new List<string>();
From your snippet, it doesn't look as though batchaddresses is initialised. Replace the line with this:
public List<string> batchaddresses = new List<string>();
