ExcelDataListExtension.cs

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using System.Collections.Generic;
 
public static class ExcelDataListExtension
{
    public static int IndexOf(this List<Dictionary<string, string>> list, string id)
    {
        for (int i = 0; i < list.Count; i++)
        {
            if (list[i]["id"] == id)
            {
                return i;
            }
        }
        return -1;
    }
 
    public static string GetNextID(this List<Dictionary<string, string>> list, string currentId, int a)
    {
        int num = list.IndexOf(currentId) + a;
        if (num >= list.Count)
        {
            num = 0;
        }
        if (num < 0)
        {
            num = list.Count - 1;
        }
        return list[num]["id"];
    }
}