42 lines
1.4 KiB
C#
42 lines
1.4 KiB
C#
namespace System.Web.Mvc {
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using System;
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using System.Collections.Generic;
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using System.Linq;
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internal class MultiServiceResolver<TService> : IResolver<IEnumerable<TService>> where TService : class {
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private IEnumerable<TService> _itemsFromService;
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private Func<IEnumerable<TService>> _itemsThunk;
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private Func<IDependencyResolver> _resolverThunk;
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public MultiServiceResolver(Func<IEnumerable<TService>> itemsThunk) {
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if (itemsThunk == null) {
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throw new ArgumentNullException("itemsThunk");
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}
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_itemsThunk = itemsThunk;
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_resolverThunk = () => DependencyResolver.Current;
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}
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internal MultiServiceResolver(Func<IEnumerable<TService>> itemsThunk, IDependencyResolver resolver)
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: this(itemsThunk) {
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if (resolver != null) {
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_resolverThunk = () => resolver;
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}
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}
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public IEnumerable<TService> Current {
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get {
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if (_itemsFromService == null) {
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lock (_itemsThunk) {
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if (_itemsFromService == null) {
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_itemsFromService = _resolverThunk().GetServices<TService>();
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}
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}
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}
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return _itemsFromService.Concat(_itemsThunk());
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}
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}
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}
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}
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