/// <summary>
/// Creates object initialization delegate.
/// </summary>
private protected override Delegate CreateInitializer()
{
ConstructorInfo ctor = (ConstructorInfo)MemberInfo;
#if !NETSTANDARD2_0
// for constructors with ref/out parameters: Dynamic method
if (ParameterTypes.Any(p => p.IsByRef))
{
DynamicMethod dm = CreateMethodInvokerAsDynamicMethod(ctor, DynamicMethodOptions.HandleByRefParameters);
return(dm.CreateDelegate(typeof(Ctor)));
}
#endif
// for constructors that have no ref parameters: Lambda expression
ParameterExpression argumentsParameter = Expression.Parameter(typeof(object[]), "arguments");
var ctorParameters = new Expression[ParameterTypes.Length];
for (int i = 0; i < ParameterTypes.Length; i++)
{
Type parameterType = ParameterTypes[i];
#if NETSTANDARD2_0
// This just avoids error when ref parameters are used but does not assign results back
if (parameterType.IsByRef)
{
parameterType = parameterType.GetElementType();
}
// ReSharper disable once AssignNullToNotNullAttribute
#endif
ctorParameters[i] = Expression.Convert(Expression.ArrayIndex(argumentsParameter, Expression.Constant(i)), parameterType);
}
NewExpression construct = Expression.New(
ctor, // constructor info
ctorParameters); // arguments cast to target types
LambdaExpression lambda = Expression.Lambda <Ctor>(
Expression.Convert(construct, Reflector.ObjectType), // return type converted to object
argumentsParameter);
return(lambda.Compile());
}
