Question

I have a Dictionary<string,string[]>
Some example values are

Key1 Value="1","2","3","4","5"
Key2 Value="7","8"
Key3 Value=null

I want to the array length to be the max of all values which in my case is 5 for Key1
so I can get a result as:

Key1 Value="1","2","3","4","5"
Key2 Value="7","8","","",""
Key3 Value="","","","",""

So all Keys have same array length = 5 and the values which didnt exist before are empty values “”.
How can this be done?

Answer 1

Try this

        Dictionary<string, List<string>> dic = new Dictionary<string, List<string>>();
        dic.Add("k1", new List<string>() { "1", "2", "3", "4", "5" });
        dic.Add("k2", new List<string>() { "7", "8" });
        dic.Add("k3", new List<string>());

        var max = dic.Max(x => x.Value.Count);
        dic.ToDictionary(
            kvp => kvp.Key,
            kvp =>
            {
                if (kvp.Value.Count < max)
                {
                    var cnt = kvp.Value.Count;
                    for (int i = 0; i < max - cnt; i++)
                        kvp.Value.Add("");
                }
                return kvp.Value;
            }).ToList();