I have an ArrayList of strings and a text file called actors. I need to write all the elements in the ArrayList to a .txt file. Here is my code so far.
void WriteArrayList()
{
foreach (object actor in ActorArrayList)
{
File.WriteAllLines("C:\\actors.txt", actor);
}
}
If you really must use ArrayList, and assuming you're using .NET 3.5 or higher, you can use the LINQ Cast method to convert it to a sequence of strings:
// .NET 4 and higher
File.WriteAllLines(@"c:\actors.txt", ActorArrayList.Cast<string>());
For .NET 3.5, you need to convert it to an array as well:
File.WriteAllLines(@"c:\actors.txt", ActorArrayList.Cast<string>().ToArray());
(The File.WriteAllLines overload taking IEnumerable<string> was only introduced in .NET 4.)
Note how you don't need to loop over the list yourself - the point of File.WriteAllLines is that it does it for you.
If you're not even using .NET 3.5, you should loop yourself - the foreach loop can implicitly cast for you:
using (TextWriter writer = File.CreateText(@"c:\actors.txt"))
{
foreach (string actor in ActorArrayList)
{
writer.WriteLine(actor);
}
}
If you can possibly use List<string> instead of ArrayList, you should. Generic collections were introduced in .NET 2, and since then there's been very little reason to use the non-generic collections.
ArrayList? If you useList<string>your life will be much simpler.ActorArrayList