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class A { A() { var x = 5; // this is allowed } var _x = 5; // the compiler is unhappy } I guess the compiler must be able to deduce the type for the member variable just the same way it does it for the local one. So what's the difference?
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var can only be used when a local variable is declared and initialized in the same statement; the variable cannot be initialized to null, or to a method group or an anonymous function. var cannot be used on fields at class scope.
In C#, when we declare a variable inside a class, the variable can be accessed within the class. This is known as class level variable scope.
Eric Lippert answered your question right here: Why no var on fields?
Basically, for the general case it would require re-writing the C# compiler, as the way it currently does type inference would not work for cycles of var field variable assignments.
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