object Instantiate(ConstructorInvokeInfo info)
{
var constructorParameters = info.ParameterInfos;
var length = constructorParameters.Length;
var parametersList = new object[length];
for (int i = 0; i < length; i++)
{
ParameterInfo parameterInfo = constructorParameters[i];
object parameter = Resolve(parameterInfo.ParameterType);
if (parameter == null && !parameterInfo.IsOptional)
{
throw new ResolutionException(
"Failed to instantiate parameter " + parameterInfo.Name);
}
parametersList[i] = parameter;
}
var constructorFunc = info.ConstructorFunc;
try
{
return(constructorFunc(parametersList));
}
catch (Exception ex)
{
throw new ResolutionException("Failed to resolve "
+ info.Constructor.DeclaringType, ex);
}
}
object Instantiate(Type type)
{
ConstructorInvokeInfo invokeInfo;
bool useLock = ThreadSafe;
if (useLock)
{
constructorDictionaryLockSlim.EnterReadLock();
}
try
{
if (constructorDictionary.TryGetValue(type, out invokeInfo))
{
return(Instantiate(invokeInfo));
}
}
finally
{
if (useLock)
{
constructorDictionaryLockSlim.ExitReadLock();
}
}
#if NETFX_CORE
var constructors = type.GetTypeInfo().DeclaredConstructors.Where(x => !x.IsStatic && x.IsPublic).ToArray();
#else
var constructors = type.GetTypeInfo().DeclaredConstructors;
#endif
ConstructorInfo constructor = null;
if (constructors.Any())
{
ConstructorInfo bestMatch = null;
int biggestLength = -1;
foreach (ConstructorInfo constructorInfo in constructors)
{
var dependencyAttributes = constructorInfo.GetCustomAttributes(typeof(InjectDependenciesAttribute), false).ToList();
//#if NETSTANDARD || NETFX_CORE
// /* Unfortunately LINQ .Count() is much slower than .Length */
// var attributeCount = dependencyAttributes.Count();
//#else
// var attributeCount = dependencyAttributes.Length;
//#endif
var attributeCount = dependencyAttributes.Count;
bool hasAttribute = attributeCount > 0;
if (hasAttribute)
{
constructor = constructorInfo;
break;
}
var length = constructorInfo.GetParameters().Length;
if (length > biggestLength)
{
biggestLength = length;
bestMatch = constructorInfo;
}
}
if (constructor == null)
{
constructor = bestMatch;
}
}
else
{
ConstructorInfo bestMatch = null;
int biggestLength = -1;
constructors = type.GetTypeInfo().DeclaredConstructors.Where(x => !x.IsStatic && x.IsPrivate);
foreach (ConstructorInfo constructorInfo in constructors)
{
var attributes = constructorInfo.GetCustomAttributes(typeof(InjectDependenciesAttribute), false);
if (attributes.Any())
{
constructor = constructorInfo;
break;
}
var length = constructorInfo.GetParameters().Length;
if (length > biggestLength)
{
biggestLength = length;
bestMatch = constructorInfo;
}
}
if (constructor == null)
{
constructor = bestMatch;
}
}
if (constructor == null)
{
throw new ResolutionException(
"Could not locate a constructor for " + type.FullName);
}
invokeInfo = new ConstructorInvokeInfo(constructor);
if (useLock)
{
constructorDictionaryLockSlim.EnterWriteLock();
}
try
{
constructorDictionary[type] = invokeInfo;
}
finally
{
if (useLock)
{
constructorDictionaryLockSlim.ExitWriteLock();
}
}
return(Instantiate(invokeInfo));
}
