#1,215 – C# 6.0 – New Syntax for Dictionary Initializers

Prior to C# 6.0, you could initialize a Dictionary object with a collection initializer as follows:

            // Initialization with collection initializer
            Dictionary<string, int> guys = new Dictionary<string, int> {
                {"Galileo", 1564},
                {"Magellan", 1480},
                {"Voltaire", 1694},
                {"Kepler", 1571},
                {"Keaton", 1895}
            };

In C# 6.0, the following syntax will also work:

            // Initialization with new dictionary initializer
            Dictionary<string, int> guys = new Dictionary<string, int>
            {
                ["Galileo"] = 1564,
                ["Magellan"] = 1480,
                ["Voltaire"] = 1694,
                ["Kepler"] = 1571,
                ["Keaton"] = 1895
            };

Note that as of 29 Oct, 2014, this feature is not enabled in the current Visual Studio 2014 CTP.

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

6 Responses to #1,215 – C# 6.0 – New Syntax for Dictionary Initializers

  1. wavecollapse says:

    Extra ‘}’ symbol here?

    [“Keaton”] = 1895}

  2. Vincent says:

    Just wondering… What’s the point of having a new syntax which is as verbose as previously ?

    • It looks more natural, I guess!

      • Vincent says:

        After little research, I found a benefit from this syntax:

        “However, a bigger advantage is that this syntax also provides the benefit of allowing you to initialize other types. Any type with an indexer will allow initialization via this syntax, where the old collection initializers only works with types that implement IEnumerable and have an Add method.”

        See the original post:

        http://stackoverflow.com/a/28076372/2065567

  3. Sean says:

    Excellent info, thanks Vincent

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