Created
February 17, 2017 15:51
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Dynamic ServiceKnownTypesDiscovery for WCF services
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| using System; | |
| using System.Collections.Generic; | |
| using System.Linq; | |
| using System.Text; | |
| using System.Reflection; | |
| using System.IO; | |
| namespace MyService.Helpers | |
| { | |
| /// <summary> | |
| /// Helps discovering all the abstract BaseDtoEntity derived classes. | |
| /// Used like this: [ServiceKnownType("GetKnownTypes", typeof(ServiceKnownTypesDiscovery))] | |
| /// on service contract interface | |
| /// </summary> | |
| class ServiceKnownTypesDiscovery | |
| { | |
| private static List<Type> _cachedTypes = null; | |
| /// <summary> | |
| /// Extracts known entity types from entities library | |
| /// </summary> | |
| /// <param name="provider">Passed in by WCF</param> | |
| /// <returns>List of BaseDtoEntity derived entity types</returns> | |
| public static IEnumerable<Type> GetKnownTypes(ICustomAttributeProvider provider) | |
| { | |
| // lazy init on first demand | |
| if (_cachedTypes == null) | |
| { | |
| _cachedTypes = new List<Type>(); | |
| var baseType = typeof(BaseDtoEntity); | |
| foreach (var asmFile in Directory.GetFiles(AppDomain.CurrentDomain.RelativeSearchPath ?? | |
| AppDomain.CurrentDomain.BaseDirectory, "*.Entities.dll")) // project specific name of the library where entities are stored | |
| { | |
| Assembly asm = Assembly.LoadFrom(asmFile); | |
| // BaseDtoEntity is abstract, therefore we excluded it | |
| _cachedTypes.AddRange(asm.GetTypes().Where(p => p != baseType && | |
| baseType.IsAssignableFrom(p))); | |
| } | |
| } | |
| return _cachedTypes; | |
| } | |
| } | |
| } |
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