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Categories / C# / Reflection

 

Attributed Types Utility

using System; using System.Collections.Generic; using System.Reflection; using System.Linq; namespace PageTypeBuilder.Reflection {     internal class AttributedTypesUtility     {         internal static List<Type> GetTypesWithAttribute(Type attributeType)         {             string attributeAssemblyName = attributeType.Assembly.GetName().Name;             List<Type> typesWithAttribute = new List<Type>();             Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();                          foreach (Assembly assembly in assemblies)             {                 AssemblyName[] referencedAssemblies = assembly.GetReferencedAssemblies();                 if(referencedAssemblies.Count(a => a.Name == attributeAssemblyName) == 0)                     continue;                 List<Type> typesWithAttributeInAssembly = GetTypesWithAttributeInAssembly(assembly, attributeType);                 typesWithAttribute.AddRange(typesWithAttributeInAssembly);             }             return typesWithAttribute;         }         private static List<Type> GetTypesWithAttributeInAssembly(Assembly assembly, Type attributeType)         {             List<Type> typesWithAttribute = new List<Type>();             Type[] types = assembly.GetTypes();             foreach (Type type in types)             {                 if (TypeHasAttribute(type, attributeType))                     typesWithAttribute.Add(type);             }             return typesWithAttribute;         }         private static bool TypeHasAttribute(Type type, Type attributeType)         {             bool typeHasAttribute = false;             object[] attributes = GetAttributes(type);             foreach (object attribute in attributes)             {                 if (attributeType.IsAssignableFrom(attribute.GetType()))                     typeHasAttribute = true;             }             return typeHasAttribute;         }         private static object[] GetAttributes(Type type)         {             return type.GetCustomAttributes(true);;         }         internal static Attribute GetAttribute(Type type, Type attributeType)         {             Attribute attribute = null;             object[] attributes = type.GetCustomAttributes(true);             foreach (object attributeInType in attributes)             {                 if (attributeType.IsAssignableFrom(attributeInType.GetType()))                     attribute = (Attribute) attributeInType;             }             return attribute;         }     } }