public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
{
switch (binder.Name)
{
case "GetValueOrDefault":
result = new DynamicNullObject {
IsExplicitNull = true
};
return(true);
case "Count":
result = 0;
return(true);
case "DefaultIfEmpty":
result = new[]
{
new DynamicNullObject
{
IsExplicitNull = false
}
};
return(true);
default:
return(base.TryInvokeMember(binder, args, out result));
}
}
public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
{
result = new DynamicNullObject
{
IsExplicitNull = false
};
return(true);
}
public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)
{
result = new DynamicNullObject
{
IsExplicitNull = false
};
return(true);
}
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
result = new DynamicNullObject
{
IsExplicitNull = false
};
return(true);
}
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
if (binder.Name == "HasValue")
{
result = false;
return(true);
}
result = new DynamicNullObject
{
IsExplicitNull = false
};
return(true);
}
public override bool TryBinaryOperation(BinaryOperationBinder binder, object arg, out object result)
{
switch (binder.Operation)
{
case ExpressionType.Equal:
result = arg == null || arg is DynamicNullObject;
break;
case ExpressionType.NotEqual:
result = arg != null && arg is DynamicNullObject == false;
break;
default:
result = new DynamicNullObject();
break;
}
return(true);
}
