44 lines
1.9 KiB
C#
44 lines
1.9 KiB
C#
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using System.Collections.Generic;
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using System.ComponentModel.Composition.Hosting;
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using System.ComponentModel.Composition.Primitives;
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using System.Linq;
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using System.Reflection;
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namespace MediaBrowser.Common.Mef
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{
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public static class MefUtils
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{
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/// <summary>
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/// Plugins that live on both the server and UI are going to have references to assemblies from both sides.
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/// But looks for Parts on one side, it will throw an exception when it seems Types from the other side that it doesn't have a reference to.
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/// For example, a plugin provides a Resolver. When MEF runs in the UI, it will throw an exception when it sees the resolver because there won't be a reference to the base class.
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/// This method will catch those exceptions while retining the list of Types that MEF is able to resolve.
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/// </summary>
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public static CompositionContainer GetSafeCompositionContainer(IEnumerable<ComposablePartCatalog> catalogs)
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{
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var newList = new List<ComposablePartCatalog>();
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// Go through each Catalog
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foreach (var catalog in catalogs)
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{
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try
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{
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// Try to have MEF find Parts
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catalog.Parts.ToArray();
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// If it succeeds we can use the entire catalog
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newList.Add(catalog);
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}
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catch (ReflectionTypeLoadException ex)
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{
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// If it fails we can still get a list of the Types it was able to resolve and create TypeCatalogs
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var typeCatalogs = ex.Types.Where(t => t != null).Select(t => new TypeCatalog(t));
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newList.AddRange(typeCatalogs);
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}
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}
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return new CompositionContainer(new AggregateCatalog(newList));
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}
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}
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}
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