Differences between Object, Var and Dynamic type

A comparison of object, var, and dynamic types in C#, explaining how each is resolved and when to use them.

The object Type

The object type is the base type for all other types in C#, and a variable declared as object can hold any value, though it requires casting to access specific members.

The var Keyword

The var keyword lets the compiler infer the actual type of a variable at compile time based on the assigned value, while still enforcing full static type checking afterward.

The dynamic Type

The dynamic type skips compile-time type checking entirely, resolving member access at runtime instead, which offers flexibility but sacrifices some compile-time safety.

Choosing the Right One

Use var for cleaner code when the type is obvious from context, object when you genuinely need to store any type generically, and dynamic sparingly, for scenarios like interop where types aren't known until runtime.