Attributed Types Utility : Attributes « Reflection « C# / C Sharp
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;
}
}
}
