Initialize value of var in C to null

Question

I want to assign a variable to an initial value of null  and assign its value in the next if-else block  but the compiler is giving an error      Implicitly-typed local variables must be initialized    How could I achieve this

User · Answer

The var keyword in C  s main benefit is to enhance readability  not functionality   Technically  the var keywords allows for some other unlocks  e g  use of anonymous objects   but that seems to be outside the scope of this question  Every variable declared with the var keyword has a type   For instance  you ll find that the following code outputs  String    var myString       Console Write myString GetType   Name     Furthermore  the code above is equivalent to   String myString       Console Write myString GetType   Name     The var keyword is simply C  s way of saying  I can figure out the type for myString from the context  so don t worry about specifying the type    var myVariable    MyType null or MyType myVariable   null should work because you are giving the C  compiler context to figure out what type myVariable should will be   For more information    How to initialize var  http   msdn microsoft com en-us library bb397696 aspx

User · Answer

var variables still have a type - and the compiler error message says this type must be established during the declaration   The specific request  assigning an initial null value  can be done  but I don t recommend it  It doesn t provide an advantage here  as the type must still be specified  and it could be viewed as making the code less readable   var x    String null    Which is still  type inferred  and equivalent to   String x   null    The compiler will not accept var x   null because it doesn t associate the null with any type - not even Object  Using the above approach  var x    Object null would  work  although it is of questionable usefulness   Generally  when I can t use var s type inference correctly then   I am at a place where it s best to declare the variable explicitly  or I should rewrite the code such that a valid value  with an established type  is assigned during the declaration    The second approach can be done by moving code into methods or functions

[c#] Initialize value of 'var' in C# to null

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