Can't use saved information to load into an array

I’ve managed to save some information into a file. I want to be able to read that information and use it to create an item

public void Save()
{            
   StreamWriter writer;
   writer = new StreamWriter("PlayerInventory.txt");
   for (int i = 0; i < playerInventory.Length; i++)
   {
      if (playerInventory[i] != null)
      {
         if (playerInventory[i] is Sheild sheild)
         {
            writer.WriteLine("Sheild:" + sheild.Defence + "," + sheild.name + "," + sheild.description + "," + sheild.cost);
         }
      }     
   }
   else
   {}
}

I started using this code to load it but i don’t know how to finish the code. Right now its split but i don’t know how to assign it to anything.

For example sheild:20,Shield,this is a shield,100

Right now that’s split into

1. 20,
2. Shield,
3. this is a shield,
4. 100

But I don’t know who to assign those stuff to an array

public void Load()
{
   StreamReader reader;
   reader = new StreamReader("PlayerInventory.txt");
   string line;
   string[] currentLineData;

   while (true)
   {
      try
      {
         line = reader.ReadLine();
         if (line == null)
         {
            break;
         }
         if (line.Contains("Sheild"))
         {
            line.Replace("Sheild:", "");
            currentLineData = line.Split(',');
         }
      } 
      catch
      {
         break;
      }
}
reader.Close();}