从填充了另一个 ArrayList 的 ArrayList 中检索数据

Question

I got 2 ArrayList objects on my project defined as

ArrayList final_list = new ArrayList();
ArrayList temp_list = new ArrayList();

I needed to fill my final_list with the other one, so I used a loop using final_list.Add(temp_list) inside of it, which works fine.
Here is an exemple about what my final_list object looks like after the loop:

The fact is I need to process the datas after the loop. So I guess I'll have to do something like

for (int i = 0; i < final_list.Count; i++)
{
    for (int j = 0; j < 6 ; j++)
    {
        // Retrieving my [0,0] , [0,1], ... , [final_list.Count,5] datas
    }
}

but this isn't working.
Anyway, I'm even struggling on the correct syntax to use so I already tried hard coded things like final_list[0,1] or final_list[0][1] to display the 10 value for exemple, but it doesn't work.
How can I manage to do that?

Answer 1

Seems you have a collection ( final_list ), which contains some collections inside. And now you want to process the inner most elements.
First of all, you'd better use generic collections instead of old ArrayList .
Generally, handling such a scenario can be done like this:

foreach( List<string> innerList in final_list)
{
     foreach( var innerMostItem in innerList)
     {
         // process the element!
     }
}

or equivelantely:

foreach( var innerList in final_list)
{
     foreach( var innerMostItem in innerList as List<string>)
     {
         // process the element!
     }
}

By the way, naming convention of C#, is to use camelCase for variables.

update
code snippet above is updated. Not the type casting in the inner loop !
Though innerList was originally an IEnumerable , it is retrieved from the final_list as an instance of object class. You need to explicitly cast it to ArrayList or you will get an exception.