What is the purpose of the readonly keyword in C#?

What is the purpose of the readonly keyword in C#?

The readonly keyword in C# is used to declare fields that can only be assigned during declaration or in a constructor.

Can you give me an example of how to use readonly in a class?

Sure! Here's an example:

public class Example
{
    public readonly int ReadOnlyField;

    public Example(int value)
    {
        ReadOnlyField = value;
    }
}

What happens if I try to change a readonly field outside of the constructor?

If you try to change a readonly field outside of its constructor, you'll get a compile-time error.

Are there any performance benefits to using readonly?

Yes, using readonly can improve performance by ensuring that the field is immutable, which can help with optimizations.