/// <summary>
/// Create an instance of the requested <see cref="Type"/> using the constructor that best matches the specified parameters.
/// </summary>
/// <typeparam name="T">The interface <see cref="Type"/> of the instance to create.</typeparam>
/// <param name="args">An array of arguments that match in number, order, and type the parameters of the constructor to invoke. If <paramref name="args"/>
/// is an empty array or <c>null</c>, the constructor that takes no parameters (the default constructor) is invoked.</param>
/// <returns>An instance of the requested <see cref="Type"/>.</returns>
public static T Create <T>(params object[] args)
{
Type typeKey = typeof(T);
Type typeVal = null;
if (_localProviderValues.Value != null && _localProviderValues.Value.ContainsKey(typeKey.AssemblyQualifiedName))
{
return((T)_localProviderValues.Value[typeKey.AssemblyQualifiedName]);
}
if (_providerValues.ContainsKey(typeKey.AssemblyQualifiedName))
{
return((T)_providerValues[typeKey.AssemblyQualifiedName]);
}
if (_typeCache.ContainsKey(typeKey))
{
return((T)Activator.CreateInstance(_typeCache[typeKey], args));
}
if (!typeKey.GetTypeInfo().IsInterface)
{
throw new InvalidOperationException(string.Format("Factory can not create an instance of Type '{0}' as this is not an Interface.", typeKey.AssemblyQualifiedName));
}
if (_typeProviders.ContainsKey(typeKey.AssemblyQualifiedName))
{
typeVal = Type.GetType(_typeProviders[typeKey.AssemblyQualifiedName], false);
}
else
{
// Assume concrete is the same name with the leading "I" removed or itself if not following that naming convention; e.g. IFoo is Foo.
string concreteName = SubstitutionRegex.Replace(typeKey.Name, string.Empty);
// Look in same Assembly as Interface for implementation (primary).
if (concreteName != typeKey.Name)
{
typeVal = Type.GetType(MakeTypeName(typeKey, concreteName));
}
// Look at namespace substitutions as it may reside in another assembly (secondary).
if (typeVal == null)
{
foreach (var substitution in _substitutions.Where(x => x.Key == Substitution.CreateKey(typeKey)))
{
typeVal = Type.GetType(MakeTypeName(substitution.Concrete, SubstitutionRegex.Replace(typeKey.Name, string.Empty)));
if (typeVal != null)
{
break;
}
}
}
}
if (typeVal == null)
{
throw new InvalidOperationException(string.Format("Factory can not create an instance of Type '{0}'; please check the naming convention and substitution rules.", typeKey.AssemblyQualifiedName));
}
lock (_lock)
{
if (_typeCache.ContainsKey(typeKey))
{
return((T)Activator.CreateInstance(_typeCache[typeKey], args));
}
_typeCache.Add(typeKey, typeVal);
return((T)Activator.CreateInstance(typeVal, args));
}
}
