private Expression BuildDecoratorEnumerableExpressionForNonConstantExpression(
Delegate wrapInstanceWithDecorator, Expression expression)
{
// Build the query: from item in expression select wrapInstanceWithDecorator(item);
var callExpression =
DecoratorHelpers.Select(expression, this.registeredServiceType, wrapInstanceWithDecorator);
if (this.Lifestyle == Lifestyle.Singleton)
{
Type enumerableServiceType =
typeof(IEnumerable <>).MakeGenericType(this.registeredServiceType);
IEnumerable CreateCollection()
{
Type funcType = typeof(Func <>).MakeGenericType(enumerableServiceType);
Delegate lambda = Expression.Lambda(funcType, callExpression).Compile();
var decoratedCollection = (IEnumerable)lambda.DynamicInvoke();
Array array = ToArray(this.registeredServiceType, decoratedCollection);
return(DecoratorHelpers.MakeReadOnly(this.registeredServiceType, array));
}
IEnumerable singleton = this.GetSingletonDecoratedCollection(CreateCollection);
// Passing the enumerable type is needed when running in a (Silverlight) sandbox.
return(Expression.Constant(singleton, enumerableServiceType));
}
return(callExpression);
}
private Expression BuildDecoratorEnumerableExpressionForConstantEnumerable(
Delegate wrapInstanceWithDecoratorDelegate, IEnumerable collection)
{
// Build the query: from item in collection select wrapInstanceWithDecorator(item);
IEnumerable decoratedCollection =
collection.Select(this.registeredServiceType, wrapInstanceWithDecoratorDelegate);
// Passing the enumerable type is needed when running in the Silverlight sandbox.
Type enumerableServiceType = typeof(IEnumerable <>).MakeGenericType(this.registeredServiceType);
if (this.Lifestyle == Lifestyle.Singleton)
{
IEnumerable CreateCollection()
{
Array array = ToArray(this.registeredServiceType, decoratedCollection);
return(DecoratorHelpers.MakeReadOnly(this.registeredServiceType, array));
}
IEnumerable singleton = this.GetSingletonDecoratedCollection(CreateCollection);
return(Expression.Constant(singleton, enumerableServiceType));
}
return(Expression.Constant(decoratedCollection, enumerableServiceType));
}
