implicit-typing – Tarik Billa

Why doesn’t C# let you declare multiple variables using var?

May 10, 2023 by Tarik

When we designed the feature I asked the community what var x = 1, y = 1.2; should mean. The question and answers are here: http://blogs.msdn.com/b/ericlippert/archive/2006/06/26/what-are-the-semantics-of-multiple-implicitly-typed-declarations-part-one.aspx http://blogs.msdn.com/b/ericlippert/archive/2006/06/27/what-are-the-semantics-of-multiple-implicitly-typed-declarations-part-two.aspx Briefly, about half the respondants said that the obviously correct thing to do was to make x and y both double, and about half the respondants said that … Read more

Why would var be a bad thing?

March 24, 2023 by Tarik

The writers of the .Net Framework Design Guidelines (awesome book) that came out in November 2008 recommend considering using var when the Type is obvious and unambiguous. On the other hand, if using var would result in an ambiguity when reading the code, as Anton Gogolev pointed out, then it’s better not to use it. … Read more

Using implicitly typed local variables [duplicate]

March 9, 2023 by Tarik

I personally only use “var” when I can clearly distinguish the variable Type by just reading the declaration, for example: var someVariable = new List<int>(); In the example above, its evident that “var” refers to “List<int>”. I don’t like to use “var” when I have to go to some method definition to find out what … Read more

Why can’t an anonymous method be assigned to var?

November 19, 2022 by Tarik

UPDATE: This answer was written over ten years ago and should be considered to be of historical interest; in C# 10 the compiler will infer some delegate types. Others have already pointed out that there are infinitely many possible delegate types that you could have meant; what is so special about Func that it deserves … Read more