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Being Lazy in C# 4
10/13/10
Being Lazy in C# 4
I’m playing with the new features of C#/.NET 4.0; this is some code I wrote in LINQPad to try out the System.Lazy<T> class.
void Main()
{
Console.WriteLine("Running...");
Expensive one = GimmeOne;
Expensive two = GimmeOne;
if (one == two) Console.WriteLine("Same instance");
}
private static readonly Lazy<Expensive> _lazy =
new Lazy<Expensive>();
// If constructor arguments, use:
// new Lazy<Expensive>(() => new Expensive(args));
Expensive GimmeOne
{
get
{
return _lazy.Value; // thread safe
}
}
class Expensive
{
public Expensive()
{
Console.WriteLine("Creating expensive instance");
}
}Output:
Running... Creating expensive instance Same instance
Update - October 14, 2010
The private field does not have to be static; there’s seldom a need for a true Singleton.
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