How to Initialize a Dictionary with a Collection Initializer

You can initialize any list and add items to inline using like the following.

List<Person> Persons = new List<Person>
{
    new Person { Age = 20, Name = "Name" }
};

But this will not work Dictionary, if you try; you will get a compile time error like “No overload for method ‘Add’ takes 1 arguments”

You can fix this issue by putting a pair of curly braces.

Dictionary<int, Person> PersonsWithId = new Dictionary<int, Person>
{
    { 10, new Person { Age = 20, Name = "Name" } }
};

You can get more info about this MSDN

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