113 lines
4.3 KiB
C#
113 lines
4.3 KiB
C#
namespace System.Web.Mvc {
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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using System.Web.Mvc.Resources;
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public class ViewEngineCollection : Collection<IViewEngine> {
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private IResolver<IEnumerable<IViewEngine>> _serviceResolver;
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public ViewEngineCollection() {
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_serviceResolver = new MultiServiceResolver<IViewEngine>(() => Items);
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}
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public ViewEngineCollection(IList<IViewEngine> list)
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: base(list) {
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_serviceResolver = new MultiServiceResolver<IViewEngine>(() => Items);
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}
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internal ViewEngineCollection(IResolver<IEnumerable<IViewEngine>> serviceResolver, params IViewEngine[] engines)
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: base(engines) {
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_serviceResolver = serviceResolver ?? new MultiServiceResolver<IViewEngine>(
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() => Items
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);
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}
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private IEnumerable<IViewEngine> CombinedItems {
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get {
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return _serviceResolver.Current;
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}
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}
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protected override void InsertItem(int index, IViewEngine item) {
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if (item == null) {
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throw new ArgumentNullException("item");
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}
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base.InsertItem(index, item);
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}
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protected override void SetItem(int index, IViewEngine item) {
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if (item == null) {
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throw new ArgumentNullException("item");
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}
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base.SetItem(index, item);
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}
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private ViewEngineResult Find(Func<IViewEngine, ViewEngineResult> cacheLocator, Func<IViewEngine, ViewEngineResult> locator) {
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// First, look up using the cacheLocator and do not track the searched paths in non-matching view engines
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// Then, look up using the normal locator and track the searched paths so that an error view engine can be returned
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return Find(cacheLocator, trackSearchedPaths: false)
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?? Find(locator, trackSearchedPaths: true);
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}
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private ViewEngineResult Find(Func<IViewEngine, ViewEngineResult> lookup, bool trackSearchedPaths) {
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// Returns
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// 1st result
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// OR list of searched paths (if trackSearchedPaths == true)
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// OR null
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ViewEngineResult result;
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List<string> searched = null;
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if (trackSearchedPaths) {
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searched = new List<string>();
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}
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foreach (IViewEngine engine in CombinedItems) {
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if (engine != null) {
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result = lookup(engine);
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if (result.View != null) {
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return result;
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}
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if (trackSearchedPaths) {
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searched.AddRange(result.SearchedLocations);
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}
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}
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}
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if (trackSearchedPaths) {
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// Remove duplicate search paths since multiple view engines could have potentially looked at the same path
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return new ViewEngineResult(searched.Distinct().ToList());
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}
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else {
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return null;
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}
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}
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public virtual ViewEngineResult FindPartialView(ControllerContext controllerContext, string partialViewName) {
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if (controllerContext == null) {
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throw new ArgumentNullException("controllerContext");
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}
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if (string.IsNullOrEmpty(partialViewName)) {
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throw new ArgumentException(MvcResources.Common_NullOrEmpty, "partialViewName");
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}
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return Find(e => e.FindPartialView(controllerContext, partialViewName, true),
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e => e.FindPartialView(controllerContext, partialViewName, false));
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}
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public virtual ViewEngineResult FindView(ControllerContext controllerContext, string viewName, string masterName) {
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if (controllerContext == null) {
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throw new ArgumentNullException("controllerContext");
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}
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if (string.IsNullOrEmpty(viewName)) {
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throw new ArgumentException(MvcResources.Common_NullOrEmpty, "viewName");
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}
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return Find(e => e.FindView(controllerContext, viewName, masterName, true),
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e => e.FindView(controllerContext, viewName, masterName, false));
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}
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}
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}
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