A constant is a static field whose value can never change.
A constant is evaluated at compile time.
A constant can be any of the built-in numeric types, bool, char, string, or an enum type.
A constant is declared with the const keyword and must be initialized with a value.
For example:
class Test { public const string Message = "Hello World"; }
A constant is more restrictive than a static readonly field.
Constants can also be declared local to a method. For example:
static void Main() { const double twoPI = 2 * System.Math.PI; }
Nonlocal constants allow the following modifiers:
| Modifiers | Value |
|---|---|
| Access modifiers | public internal private protected |
| Inheritance modifier | new |