void SetConstructor()
{
var ctor = Type.TryGetConstructors().OrderBy(x => x.GetParameters().Length).FirstOrDefault();
if (ctor == null)
{
#if NET472 || NETCOREAPP2_1
if (Type.GetTypeInfo().IsValueType)
{
fastCtor = EmitHelper.CreateParameterlessConstructorHandler(Type);
}
#endif
return;
}
var ps = ctor.GetParameters();
var cargs = new object[ps.Length];
for (int i = 0; i < ps.Length; i++)
{
var p = ps[i];
if (!p.HasDefaultValue)
{
return;
}
cargs[i] = p.DefaultValue;
}
emtpy_constructor = new FastMethod(ctor);
empty_params = cargs;
}
public static object Create(ITypeTree <ServiceDefinition> services, ITypeTree <object> scope, Type type, params object[] parameters)
{
if (type.IsValueType)
{
return(Activator.CreateInstance(type));
}
if (scope == null)
{
scope = new TypeTree <object>();
}
bool first = createSession == null;
if (first)
{
createSession = new List <ICreateCallback>();
}
try
{
// private constructor are private for a reason, don't use them!
var ctor = FindConstructors(services, scope, type).FirstOrDefault(x => x.IsPublic);
if (ctor == null)
{
throw new InvalidOperationException($"Type {type.FullName} can't be Activated, no constructor can be called at this time.");
}
var pis = ctor.GetParameters();
var cargs = new object[pis.Length];
for (int i = 0; i < pis.Length; i++)
{
var p = pis[i];
var impa = p.GetCustomAttribute <ImportAttribute>();
var t = (impa != null ? impa.ImportedType : null) ?? p.ParameterType;
var descendant = MergeKeys(services, scope, t).Where(x => x != type).FirstOrDefault();
var val = parameters != null?parameters.FirstOrDefault(x => t.IsInstanceOfType(x)) : null;
if (val != null)
{
cargs[i] = val;
}
else if (descendant != null)
{
cargs[i] = SolveExact(services, scope, descendant);
}
else if (p.HasDefaultValue)
{
cargs[i] = p.DefaultValue;
}
else if (CanBeInstantiated(t))
{
cargs[i] = Resolve(services, scope, t).FirstOrDefault();
}
}
var fc = FastMethod.GetMethod(ctor);
var result = fc.Invoke(null, cargs);
if (scope != null)
{
scope[type] = result;
}
if (result is ICreateCallback)
{
createSession.Add((ICreateCallback)result);
}
ResolveProperties(services, scope, result);
return(result);
}
finally
{
if (first)
{
for (int i = 0; i < createSession.Count; i++)
{
((ICreateCallback)createSession[i]).OnCreated();
}
createSession = null;
}
}
}