using System; using System.Collections.Generic; using System.ComponentModel.Design; using System.Reflection; using System.ComponentModel; namespace PresentationModelBase { //this service provider will try to create an instance of //the requested service by using some pre-registered //implementations or if the serviceType is a concrete implementation //it will use activator to create an instance of it internal class ServiceCreator : IServiceProvider { public ServiceCreator() { _preRegistered = new Dictionary<Type, Type> { { typeof(ICustomActionPresentationModel), typeof(CustomActionPresentationModel) }, { typeof(ICollection<>), typeof(BindingList<>) } }; } Dictionary<Type, Type> _preRegistered = new Dictionary<Type, Type>(); #region IServiceProvider Members public object GetService(Type serviceType) { if (serviceType.IsClass && !serviceType.IsAbstract) { return Activator.CreateInstance(serviceType); } else { if (serviceType.IsGenericType) { if (!_preRegistered.ContainsKey(serviceType)) { Type genericTypeDefInterface = serviceType.GetGenericTypeDefinition(); if (_preRegistered.ContainsKey(genericTypeDefInterface)) { Type[] typeParameters = serviceType.GetGenericArguments(); Type genericTypeDef = _preRegistered[genericTypeDefInterface]; Type constructedType = genericTypeDef.MakeGenericType(typeParameters); return Activator.CreateInstance(constructedType); } } else { Type impl = _preRegistered[serviceType]; return Activator.CreateInstance(impl); } } } return null; } #endregion } }
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