private bool TryResolve(ConstructorInfo constructor, out Func <IServiceResolver, object> callSite)
{
callSite = null;
var parameters = constructor.GetParameters();
var reflector = constructor.GetReflector();
if (parameters.Length == 0)
{
callSite = resolver => reflector.Invoke();
return(true);
}
var parameterResolvers = new Func <IServiceResolver, object> [parameters.Length];
for (var i = 0; i < parameters.Length; i++)
{
var parameter = parameters[i];
var serviceType = parameter.ParameterType;
if (!_serviceTable.Contains(serviceType))
{
if (!parameter.HasDefaultValue)
{
return(false);
//throw new InvalidOperationException($"Cannot resolve parameter '{parameter.Name}：{parameter.ParameterType}' for '{constructor}'");
}
var defaultValue = parameter.DefaultValue;
parameterResolvers[i] = resolver => defaultValue;
}
else
{
parameterResolvers[i] = resolver => resolver.Resolve(serviceType);
}
}
callSite = resolver =>
{
var args = new object[parameterResolvers.Length];
for (var i = 0; i < args.Length; i++)
{
args[i] = parameterResolvers[i](resolver);
}
return(reflector.Invoke(args: args));
};
return(true);
}
