/// <summary>
/// Update a greeting
/// </summary>
public void Update(Greeting greeting)
{
var existing = Get(greeting.Id);
if (existing == null)
{
throw new InvalidOperationException("Existing greeting not found.");
}
existing.Message = greeting.Message;
}
/// <summary>
/// Sets some default data. This would normally be stored in a database.
/// </summary>
private void SetDefaultData()
{
if (_greetings == null)
{
var greeting = new Greeting
{
Id = 1,
Message = "Hello world"
};
_greetings = new List<Greeting> {greeting};
}
}
/// <summary>
/// Add a greeting.
/// </summary>
public void Add(Greeting greeting)
{
// fake an auto-incrementing database identity
greeting.Id = _greetings.Max(x => x.Id) + 1;
_greetings.Add(greeting);
}