public static TExtension GetRequiredExtension <TExtension>(this IExtensionManager extensionManager) where TExtension : IExtension
{
var found = extensionManager
.GetRegisteredExtensions()
.Where(extension => typeof(TExtension).IsAssignableFrom(extension.GetType()))
.FirstOrDefault()
.SelectOrDefault(x => (TExtension)(object)x);
if (found == null)
{
throw new InvalidOperationException("Extension of type {0} has not been registered".InvariantCultureFormat(typeof(TExtension).FullName));
}
return(found);
}
public static TExtension FindOrCreateExtension <TExtension>(this IExtensionManager extensionManager, Func <TExtension> factory) where TExtension : IExtension
{
var found = extensionManager
.GetRegisteredExtensions()
.Where(extension => typeof(TExtension).IsAssignableFrom(extension.GetType()))
.FirstOrDefault()
.SelectOrDefault(x => (TExtension)(object)x);
if (found == null)
{
found = factory();
extensionManager.RegisterExtension(found);
}
return(found);
}