how to make dictionary in c# code example

Example 1: c sharp create dictionary

// To initialize a dictionary, see below:
IDictionary<int, string> dict = new Dictionary<int, string>();
// Make sure to give it the right type of key and value

// To add values use 'Add()'
dict.Add(1,"One");
dict.Add(2,"Two");
dict.Add(3,"Three");

// You can also do this together with the creation
IDictionary<int, string> dict = new Dictionary<int, string>()
{
	{1,"One"},
	{2, "Two"},
	{3,"Three"}
};

Example 2: declare dictionary c#

var students2 = new Dictionary<int, StudentName>()
        {
            [111] = new StudentName { FirstName="Sachin", LastName="Karnik", ID=211 },
            [112] = new StudentName { FirstName="Dina", LastName="Salimzianova", ID=317 } ,
            [113] = new StudentName { FirstName="Andy", LastName="Ruth", ID=198 }
        };

Example 3: how to create dictionary of list in c#

public static void Main()
        {
            Dictionary<String, List<string>> dic = new Dictionary<string, List<string>>();

            List<string> li1 = new List<string>();
            li1.Add("text1"); li1.Add("text2"); li1.Add("text3"); li1.Add("text4");

            List<string> li2 = new List<string>();
            li2.Add("text1"); li2.Add("text2"); li2.Add("text3"); li2.Add("text4");

            dic["1"] = li1;
            dic["2"] = li2;


            foreach (string key in dic.Keys)
            {
                foreach (string val in dic[key])
                {
                    Console.WriteLine(val);
                }
            }
        }

Example 4: c sharp add item to dictionary

// To add an item to a dictionary use 'Add()'
dict.Add(1,"One");