How to give a value to a placeholder who is in a constant?

Question

I have a constant which returns a text for an exception. In this constant I have a placeholder which I have to use. How am I supposed to use this placeholder?

Here is my code:

public static class Messages
{
    public const string ShipDestroyed = "{0} has been destroyed";
}

I use the constant in this method in another class:

protected void ValidateAlive(IStarship ship)
{
    if (ship.Health <= 0)
    {
        throw new ShipException(Messages.ShipDestroyed); 
    }
}

I want to put the "ship.Name" property into the placeholder.

Answer 1

Use String.Format:

throw new ShipException(String.Format(Messages.ShipDestroyed, ship.Name));

If you follow the link, you can see what kind of nice stuff you can do with it.