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Maybe I live in a bubble, or am just too new, but I was wondering if anyone else has noticed the heavy use of 'var' to declare variables instead of a specific type in many of the MVC examples by Microsoft? Is there a purpose for this, or is it the "in" thing to do now, or just personal style?
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It is recommended to use var only when it is necessary, that is, when the variable will be used to store an anonymous type or a collection of anonymous types. The complaint that var reduces readability is not shared by everyone.
Keywords are the words in a language that are used for some internal process or represent some predefined actions. var is a keyword, it is used to declare an implicit type variable, that specifies the type of a variable based on initial value.
var requires less typing. It also is shorter and easier to read, for instance, than Dictionary<int,IList> . var requires less code changes if the return type of a method call changes. You only have to change the method declaration, not every place it's used.
Razor is a templating engine and ASP.NET MVC has implemented a view engine which allows us to use Razor inside of an MVC application to produce HTML. However, Razor does not have any ties with ASP.NET MVC. Now, Razor Syntax is compact which minimizes the characters to be used, however it is also easy to learn.
Jared Parsons talked about this in his blog I don't agree with his conclusions (as my comment there indicates), but this article should explain why it's used so much.
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All MVC Videos are maded in speedy way(also not always they using Unit test or placing bussiness logic in controlers). This is not because they are bad programmers, or "var" is cool, but because they want to quickly show some cool new features, and typing full name twice is not what they want to show.
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