C#的singleton 模式的实现
/// <summary>
/// GenericSingleton provides a generic means of defining a singleton.
/// </summary>
public static class GenericSingleton<T> where T : class
{
private static int instanceCount;
private static T instance;
/// <summary>
/// Instance of the singleton.
/// </summary>
public static T Instance
{
get
{
if (instanceCount == 0)
{
T newInstance = createInstance();
object reference = Interlocked.CompareExchange(
ref instance, newInstance, null);
if (reference == null)
Interlocked.Increment(ref instanceCount);
}
return instance;
}
}
/// <summary>
/// Create an instance of the specified type.
/// </summary>
private static T createInstance()
{
return (T)Activator.CreateInstance(typeof(T),
BindingFlags.NonPublic | BindingFlags.Public |
BindingFlags.Instance, null, new object[0],
CultureInfo.InvariantCulture);
}
}