Dictionary Initializers

Before C# 6, we could initialize a Dictionary using the { key, value } syntax:

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var dictionary = new Dictionary<string, string> {      { "LAX", "Los Angeles International Airport" },      { "MEL", "Melbourne Tullamarine Airport" } };

While this syntax works fine, if you’re initializing complex objects with nested structures, all these curly braces get in the way and you may easily lose track of them.

C# 6 introduces a new index-like syntax to initialize dictionaries:

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var dictionary = new Dictionary<string, string> {      ["LAX"] = "Los Angeles International Airport",      ["MEL"] = "Melbourne Tullamarine Airport" };

With this syntax, the extra noise due to curly braces is gone. Plus, keys stand out a bit more.