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  • Query something and return the reason if nothing has been found

    - by Daniel Hilgarth
    Assume I have a Query - as in CQS that is supposed to return a single value. Let's assume that the case that no value is found is not exceptional, so no exception will be thrown in this case. Instead, null is returned. However, if no value has been found, I need to act according to the reason why no value has been found. Assuming that the Query knows the reason, how would I communicate it to the caller of the Query? A simple solution would be not return the value directly but a container object that contains the value and the reason: public class QueryResult { public TValue Value { get; private set; } public TReason ReasonForNoValue { get; private set; } } But that feels clumsy, because if a value is found, ReasonForNoValue makes no sense and if no value has been found, Value makes no sense. What other options do I have to communicate the reason? What do you think of one event per reason? For reference: This is going to be implemented in C#.

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  • Player rewards in games where you normally have nothing to purchase

    - by PeterK
    In many games there are rewards such as gold coins, points, etc. When these rewards can be used to purchase in-game items, it motivates the player to keep playing. Let's say we have an online game, poker, Yatzy etc. What type of reward would keep the players playing if there are few in-game items available to buy, or none at all? What I am looking for is a reward system that entices the players to play more in a game environment where there isn't that much to purchase. For example, there isn't much to buy in a poker or Yatzy game with the gold you win. I guess having some titles that are added to the userid is one way, or maybe purchasing a logo for the id... A leaderboard is another. Any thoughts on this?

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  • Middle-click does nothing but makes window controls appear

    - by hleinone
    Just did a fresh install of Precise Pangolin on my laptop and noticed that the middle-click (actually three finger-tap on the touchpad) on Firefox doesn't work as it used to. When doing it on a link it doesn't get opened on a new tab, in fact, it doesn't get opened at all. Only the (useless) window size and position controls appear, as demonstrated on terminal in the following screen shot. How do I get my tab-opening middle-clicks back?

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  • ListBoxItem.Parent returns nothing, unable to get it thru VisualTreeHelper.GetParent either

    - by Shimmy
    How do I extract the parent container of a ListBoxItem? In the following example I can go till the ListBoxItem, higher than that I get Nothing: <ListBox Name="lbAddress"> <ListBox.ItemTemplate> <DataTemplate> <Button Click="Button_Click"/> </DataTemplate> </ListBox.ItemTemplate> </ListBox> Private Sub Button_Click(sender As Button, e As RoutedEventArgs) Dim lbAddress = GetAncestor(Of ListBox) 'Result: Nothing End Sub Public Shared Function GetAncestor(Of T)(reference As DependencyObject) As T Dim parent = GetParent(reference) While parent IsNot Nothing AndAlso Not parent.GetType.Equals(GetType(T)) parent = GetAncestor(Of T)(parent) End While If parent IsNot Nothing Then _ Return If(parent.GetType Is GetType(T), parent, Nothing) Return Nothing End Sub Public Function GetParent(reference As DependencyObject) As DependencyObject Dim parent As DependencyObject = Nothing If TypeOf reference Is FrameworkElement Then parent = DirectCast(reference, FrameworkElement).Parent ElseIf TypeOf reference Is FrameworkContentElement Then parent = DirectCast(reference, FrameworkContentElement).Parent End If Return If(parent, VisualTreeHelper.GetParent(reference)) End Function Update This is what happens (note that the 'parent' variable remains null):

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  • Setting Nullable Integer to String Containing Nothing yields 0

    - by Brian MacKay
    I've been pulling my hair out over some unexpected behavior from nullable integers. If I set an Integer to Nothing, it becomes Nothing as expected. If I set an Integer? to a String that is Nothing, it becomes 0! Of course I get this whether I explicitly cast the String to Integer? or not. I realize I could work around this pretty easily but I want to know what I'm missing. Dim NullString As String = Nothing Dim NullableInt As Integer? = CType(NullString, Integer?) 'Expected NullableInt to be Nothing, but it's 0! NullableInt = Nothing 'This works -- NullableInt now contains Nothing. How is this EDIT: Previously I had my code up here so without the explicit conversion to 'Integer?' and everyone seemed to be fixated on that. I want to be clear that this is not an issue that would have been caught by Option Strict On -- check out the accepted answer. This is a quirk of the string-to-integer conversion rules which predate nullable types, but still impact them.

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  • How to submit Nothing as a route value to ASP MVC

    - by Adam
    I have a route with several optional parameters. These are possible search terms in different fields. So, for example, if I have fields key, itemtype and text then I have in global.asax: routes.MapRoute( _ "Search", _ "Admin.aspx/Search/{Key}/{ItemType}/{Text}", _ New With {.controller = "Admin", .action = "Search" .Key = Nothing, .ItemType = Nothing, .Text = Nothing} _ ) My action takes optional parameters: Function Search(Optional ByVal Key As String = Nothing, _ Optional ByVal ItemType As Integer = 0, _ Optional ByVal Text As String = Nothing, _ Optional ByVal OtherText As String = Nothing) It then checks if the Key and Text strings have a non-null (and non-empty) value and adds search terms to the db request as needed. However, is it possible to send in a null value for, for example, Key but still send in a value for Text? If so, what does the URL look like? (Admin.aspx/Search//0/Foo doesn't work :) ) I know I can handle this using a parameter array instead, but wondered if this was possible using the sort of route described? I could of course define some other value as equivalent to null (for example, a space/%20) but is there any way to send a null value in the URL? I'm suspecting not, but thought I'd see if anyone knew of one. I'm using ASP MVC 2 for this project.

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  • Setting subversion "password-stores" does nothing?

    - by Coderer
    The Subversion documentation says that I can set a parameter in ~/.subversion/config like [auths] password-stores = gnome-keyring to have it cache my certificate password in gnome-keyring. I set the option, and nothing happens -- no error messages, no change in behavior, nothing. Maybe I'm missing a log somewhere? I know subversion has to be compiled to support this but AFAIK I'm using the RPM version, which (they say...) ships with it rolled in. Is there a way to check whether my binary supports keyring? Shouldn't it say something if it doesn't?

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  • Close lid option "Do nothing" absent

    - by Jaap
    I just unpacked my new Sony Vaio, with windows 8 pro installed. Everything is nice, so I tried setting my power management options. The "When I close the lid" option only list: Hibernate Sleep Shutdown The "Do nothing" option is not present. I've seen loads of stuff on google where people ask or explain how to set this option to "Do nothing", but in all my power plans this option is absent... Can I use a tool to prevent this, or is there a way to force windows to show me this option (and that it actually works)? UPDATE powercf /q guid gives me this output: Subgroup GUID: 4f971e89-eebd-4455-a8de-9e59040e7347 (Power buttons and lid) GUID Alias: SUB_BUTTONS Power Setting GUID: 5ca83367-6e45-459f-a27b-476b1d01c936 (Lid close action) GUID Alias: LIDACTION Possible Setting Index: 000 Possible Setting Friendly Name: Sleep Possible Setting Index: 001 Possible Setting Friendly Name: Hibernate Possible Setting Index: 002 Possible Setting Friendly Name: Shut down Current AC Power Setting Index: 0x00000000 Current DC Power Setting Index: 0x00000000 Other sections have different enumerations where 000 stands for No action

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  • tcp connect hangs on SYN_SENT if something listens, gets CONN_REFUSED if nothing listens

    - by Amos Shapira
    I'm hitting a very strange problem - when I try to connect to one of our servers the client hangs with SYN_SENT if something listens on the port (e.g. Apache on port 80, sshd on port 22 or SMTP on port 25) but if I try to connect to a port on which nothing listens then I immediately get a "CONNECTION refused" error. Connecting to other applications (e.g. rsyncd on some arbitrary port) succeeds. I ran tcpdump on the server and see that the SYN packets arrive to it but it only sends a response if nothing listens on that port. e.g.: on the server I run: # tcpdump -nn port 81 06:49:34.641080 IP 10.x.y.z.49829 server.81: S 3966400723:3966400723(0) win 12320 06:49:34.641118 IP server.81 x.y.z.49829: R 0:0(0) ack 3966400724 win 0 But if I listen on this port, e.g. with nc -4lvvv 81 & Then the output of tcpdump is: 06:44:31.063614 IP x.y.z.45954 server.81: S 3493682313:3493682313(0) win 12320 (and repeats until I stop it) The server is CentOS 5, the client is Ubuntu 11.04, the connection is done between two LAN's over per-user TCP OpenVPN. Connection to other servers on that network do not have a problem. Connecting from the other servers on the same network to that server works fine. Connections from other clients in our office over openvpn is also not a problem. What am I missing? Thanks.

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  • nothing in dev folder

    - by 4321bust
    hi, i'm new to this so bear with me plz. im attempting to set up git on my mac and need to be using my dev folder. however, there seems to be nothing in my folder ("zero KB on disk") with no sub directories listed. other hidden directories are intact. i've never really gone this deep into things before so i'm not sure how/why anything would previously have been deleted. any help greatly appreciated.

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  • rspec returns nothing

    - by Nicolo77
    I am trying to use rspec on my rails application I run "spec path/to/spec/spec.rb" and it appears to do nothing and returns nothing. I receive no error Rails Version 2.3.4 Ruby 1.8.7 Rspec 1.3.0 rspec-rails 1.3.2 Any help is appreciated. Thanks. I'm still getting nothing when running "spec spec/models/fee_spec.rb" or any other *_spec.rb It works fine for my co-worker on his mac Here is the file fee_spec.rb *File.dirname(FILE) + '/../spec_helper' describe Fee do it "should be valid" do Fee.new.should be_valid end end*

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  • Get-ADGroupMember returns nothing while being completed successfully

    - by Volodymyr
    I've tried to list all of the members of one of the groups in AD, but nothing is returned, although the command is completed successfully. It neither works with group DN specified, instead of sAMAccountName. Get-ADGroupMember "sAMAccountName" -Recursive | select name See output below: The following message appears if one views Members from dsa.msc --------------------------- Active Directory Domain Services --------------------------- Some of the object names cannot be shown in their user-friendly form. This can happen if the object is from an external domain and that domain is not available to translate the object's name. --------------------------- OK --------------------------- Can this be a reason for powershell not returning results? Any thoughts? UPD: this doesn't seem to be permissions issue, since dsquery does return group members.

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  • Nothing happens when trying to upgrade from Linux Mint 12 to 13

    - by Ares
    I am trying to upgrade from Linux Mint 12 to 13 using apt-get. After running the following commands, nothing seems to happen. I am fairly new to linux, what am I doing wrong? user@olympus /etc/default $ sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. user@olympus /etc/default $ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

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  • Motherboard on, but nothing will start

    - by Geeklat
    I'll try and be as clear as possible. Recently I purchased a barebones kit for my first attempt at a full PC assembly. I've gone through and connected all the parts correctly based on numerous examples that confirm everything is connected correctly. The motherboard and the video card are receiving power based on the fact that the motherboard's power LED is on and the video card has some LEDs on. Nothing else in the computer will come on when pressing the power button on the case. No fans, no hard drive, no CPU fan. Not even for a split second. I also receive no beeping noise from the speaker connected to the motherboard. I've also tried swapping the reset and power connectors from the front of the case to no luck.

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  • Opscode Chef nginx compile from source issue reports successful run but does nothing

    - by v_abhi_v
    I am trying to install nginx from source in Opscode Chef and its bit weird, it runs complaining nothing but does not install it either. This is how my role attributes look like looks like "nginx":{ "default_site_enabled":false, "version":"1.2.6", "init_style":"init", "install_method":"source", "configure_flags":[ "--without-http_access_module", "--without-http_auth_basic_module", "--without-http_autoindex_module", "--without-http_browser_module", "--without-http_charset_module", "--without-http_fastcgi_module", "--without-http_memcached_module", "--without-http_referer_module", "--without-http_scgi_module", "--without-http_split_clients_module" ], "log_dir":"/var/log/nginx", "binary":"/opt/nginx/sbin/nginx", "source":{ "prefix":"/opt/nginx/dist", "modules":["http_ssl_module", "http_gzip_static_module" ] } }, The chef log shows: [2012-12-19T02:37:44+00:00] INFO: Processing bash[compile_nginx_source] action run (nginx::source line 82) [2012-12-19T02:37:45+00:00] INFO: bash[compile_nginx_source] ran successfully I am clueless on what's going on :(

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  • HP Printer scrolls "printing" forever - but nothing happens

    - by brett80
    I got a used HP Officejet 7130 all-in-one printer. I tried printing a text document, and it shows up in the queue (and says "printing"), and the printer display says "Printing" "Press Cancel to cancel job." - and it cyles that text forever, but nothing ever happens (after a couple of initial quiet noises.) I tried to print a test page from the printer, and I get the same "printing" message. I checked the hp website, and this problem is not on their list. (They are expecting a queue problem, error message, etc.) I did initially get a message that it needs new ink cartridges, but I pressed to get past that. It's supposed to try to print anyway. I don't want to buy ink cartridges for a printer that is broken. When I press it cancels correctly.

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  • XP boot timer=> set, but does nothing?

    - by mark
    My PC has XP Pro and the boot.ini file looks like this: [boot loader] timeout=30 default=multi(0)disk(0)rdisk(0)partition(2)\windows [operating systems] C:\CMDCONS\BOOTSECT.DAT="Microsoft Windows Recovery Console" /cmdcons multi(0)disk(0)rdisk(0)partition(2)\windows="eXPee Pro" /noexecute=optin /fastdetect Up until about a week ago it would just time-out and boot normally. I haven't made any hardware changes at all. Now, when the system boots it just sits there and waits for me to hit -enter-. I've searched all over for explanations & possible causes, but found nothing which seems to relate. Anyone here have any idea what may have caused the timer to simply quit working like that ? (BTW, the system clock works just as it ever did and keeps time precisely.) Thanks.

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  • vsftpd chroot_local_user does nothing

    - by Reinderien
    I'm setting up a vsftpd server on: Linux 2.6.32-26-server #48-Ubuntu SMP Wed Nov 24 10:28:32 UTC 2010 x86_64 GNU/Linux When I set chroot_local_user=YES, there is no effect (I can still see / when I log in). There is nothing in syslog or /var/log/vsftpd.log to indicate what's wrong. I know that I'm editing the right conf file and that other settings do come into effect when I restart the daemon, because these work: ssl_enable=YES force_local_data_ssl=YES force_local_logins_ssl=YES Any idea what's wrong? Thanks. Edit: I've touched /etc/vsftpd.chroot_list for it to be empty (no chroot-denied users), and have added: chroot_list_enable=YES chroot_list_file=/etc/vsftpd.chroot_list Then to restart: sudo /etc/init.d/vsftpd restart Rather than invoking init scripts through /etc/init.d, use the service(8) utility, e.g. service vsftpd restart Since the script you are attempting to invoke has been converted to an Upstart job, you may also use the restart(8) utility, e.g. restart vsftpd vsftpd start/running, process 5606 Still no effect.

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  • SSH command from PHP script - nothing, yet work at cmd line

    - by waxical
    I'm working on an EC2 box and trying to SSH command another box. The command works in command-line, even php -a interactive. However it does not work when running as apache. Example cmd:- system('ssh -i /home/me/keys/key.pem [email protected] "ls"'); I've tried adding apache to wheel group, and gshadow on both boxes. I've also just tried chowning the pem file to apache. Nothing. Yet the command response fine in the two other use cases outlines. What's going on here? Anyone know?

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  • DNS lookup working but nothing pinging

    - by blsub6
    I have three forward lookup zones in my DNS server. When I try pinging a server that's part of lookup zone A from a computer that's part of that same zone, I get a response. If I try pinging a server that's not in the same zone as the computer I'm pinging from, I get nothing. When I try an nslookup of the servers that are not part of the same lookup zone, the names resolve correctly. If I append the domain onto the name, I can ping it just fine. Is there a way I can fix this? or do I need to keep appending the domain onto the name if the computer I'm trying to ping is not of the same domain as me?

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  • Mint 13 does nothing when laptop lid is closed

    - by ewok
    I have a laptop running Mint 13. I have it hooked up to a 30" monitor and have no use for the laptop being open, so I put it on a shelf and close it. When I do that, the monitor goes blank. The power manager does not have an option for doing nothing when the lid is closed. The options are "Blank Screen", "Suspend", and "Shutdown". Is there a way to make the laptop not go to a blank screen when the lid is closed?

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