c# - var in class gives error -

possible duplicate:
using var outside of method

class { string x; } // proper class { var x; } // improper (gives error) 

why it, cant have var type variable declare in class , can done in order achieve or alternative ?

in function/method, can declare var type variable,then why can't, in class ?

thanks.

// method variable var x; 

is never valid - inside method; need immediate initialization infer type:

// method variable var x = "abc"; // string 

as why isn't available fields field-initializer: simply, spec says so. why spec says debate... check annotated spec, suspicion more necessary method variables, logic more complex (re linq etc). also, often used anonymous types (that being necessity existence); anonymous types can't exposed on public api... have confusing:

private var foo = new { x = 123, y = "abc"}; // valid public var bar = new { x = 123, y = "abc"}; // invalid 

so in i'm happy current logic.