internal bool TryGetUserActivatedInstance(Type t, CreateInstanceContext context, out object activated)
{
activated = null;
if (this.activators.TryGetValue(t, out var a))
{
activated = a(context);
return(true);
}
return(false);
}
public object CreateInstance(Type type, CreateInstanceContext cx)
{
if (CustomCreateInstanceWith != null)
{
var instance = CustomCreateInstanceWith(type, cx);
return instance;
}
else
{
var targetTypeDescription = TypeDescriptor.DescribeType(type);
var instance = targetTypeDescription.CreateInstance();
return instance;
}
}
// todo context should be local to serialzation (type)
// todo: this may also try to reuse type mapper code rather than copy it
protected bool TryCreateInstace(Type targetType, CreateInstanceContext create_cx, out object newInstance)
{
newInstance = null;
try
{
if (CustomCreateInstanceWith != null)
{
try
{
newInstance = CustomCreateInstanceWith(targetType, create_cx);
return true;
}
catch (Exception ex)
{
throw;
}
}
var constructor = targetType
.GetConstructor(
BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic,
binder: null,
types: Type.EmptyTypes,
modifiers: null);
if (constructor != null)
{
newInstance = constructor.Invoke(null);
return true;
}
}
catch (Exception ex)
{
ex.TryAddContextData("target type", () => targetType.FullName);
InternalTrace.Information(ex, "Failed to create instance of type.");
}
return false;
}
internal object GetActivatedInstance(Type t, CreateInstanceContext context)
{
if (this.activators.TryGetValue(t, out var a))
{
return(a(context));
}
else
{
try
{
return(Activator.CreateInstance(t));
}
catch (MissingMethodException exc)
{
throw new InvalidOperationException(string.Format(
"Failed to create type '{1}'. Only types with a " +
"parameterless constructor or an specialized creator can be created. Make sure the type has " +
"a parameterless constructor or a configuration with an corresponding creator is provided.",
exc.Message,
t.FullName));
}
}
}
