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In C#, "constant" and "readonly" are both used to declare variables that cannot be changed at runtime, but they have some differences in their behavior:
The main difference between constant and readonly variables is that constant variables must be initialized at the time of declaration, whereas readonly variables can be initialized at runtime, but only once. Constant variables are evaluated at compile-time, whereas readonly variables are evaluated at runtime.
- Constant:
A constant variable is a value that is known at compile time and cannot be changed during the execution of the program. They are declared using the "const" keyword and must be initialized at the time of declaration. The value of a constant is evaluated at compile-time and the value is substituted wherever the constant is used in the code. Constant variables are implicitly static and are scoped to the class in which they are defined.
Example:
public class MyClass
{
public const int myConstant = 10;
}
- Readonly:
A readonly variable is a value that can be set at runtime but only once, i.e., after initialization, it cannot be changed. They are declared using the "readonly" keyword and must be initialized either at the time of declaration or in the constructor. The value of a readonly variable is evaluated at runtime. Readonly variables are not implicitly static, and their scope is determined by the accessibility of the variable.
Example:
public class MyClass
{
public readonly int myReadonly;
public MyClass(int val)
{
myReadonly = val;
}
}
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