How to find index of sublist without class C#

Question

I want to find the index of sublist in list route which contains certain value(i), but I don't want to make a class of it. Here is my code:

var route = new List<List<int>>();
for (int i = 0; i<DC1; ++i)
{
    for (int j = 0; j<DC1; ++j)
    {   
        if (routeopt.x[0, j] == 1)
        {
            List<int> subroute = new List<int>();                        

            if (routeopt.x[i, j] == 1)
            { 
                subroute.Add(j);
                route.Add(subroute);
            }
        }
    }

    if(i == 0) continue;

    for (int j = 1; j<DC1;j++ )
    {
        if (routeopt.x[i, j] == 1)
        route[route.IndexOf(i)].Add ( j);
    }
}

foreach (var subroute in route)
{
    Console.Write("subroute: ");
    foreach (int s in subroute)
        Console.Write(s + " ");
        Console.WriteLine();
}

For example, based on this code:

for (int j = 1; j < DC1;j++ )
{
     if (routeopt.x[i, j] == 1)
     route[route.IndexOf(i)].Add(j);
}

I want to make if x[1,3] == 1 then I can add 3 to sublist which contains 1. this code route.IndexOf(i) is still get red underline, please help how to correct it. Thanks

Answer 1

You can use LINQ's Single method to retrieve the specific list you want given a predicate Contains(i). Here I am looking for the list that contains 6, and adds 7 to it.

 var routes = new List<List<int>>()
 {
   new List<int>() {1, 2, 3},
   new List<int>() {4, 5, 6},   
 };

 List<int> targetList = routes.Single(i => i.Contains(6));
 targetList.Add(7);

To get specifically the index of that list, then you can use IndexOf method like:

 int targetListIndex = routes.IndexOf(targetList); // 1 in this example