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  • LINQ Except operator and object equality

    - by Abhijeet Patel
    Here is an interesting issue I noticed when using the Except Operator: I have list of users from which I want to exclude some users: The list of users is coming from an XML file: The code goes like this: interface IUser { int ID { get; set; } string Name { get; set; } } class User: IUser { #region IUser Members public int ID { get; set; } public string Name { get; set; } #endregion public override string ToString() { return ID + ":" +Name; } public static IEnumerable<IUser> GetMatchingUsers(IEnumerable<IUser> users) { IEnumerable<IUser> localList = new List<User> { new User{ ID=4, Name="James"}, new User{ ID=5, Name="Tom"} }.OfType<IUser>(); var matches = from u in users join lu in localList on u.ID equals lu.ID select u; return matches; } } class Program { static void Main(string[] args) { XDocument doc = XDocument.Load("Users.xml"); IEnumerable<IUser> users = doc.Element("Users").Elements("User").Select (u => new User { ID = (int)u.Attribute("id"), Name = (string)u.Attribute("name") } ).OfType<IUser>(); //still a query, objects have not been materialized var matches = User.GetMatchingUsers(users); var excludes = users.Except(matches); // excludes should contain 6 users but here it contains 8 users } } When I call User.GetMatchingUsers(users) I get 2 matches as expected. The issue is that when I call users.Except(matches) The matching users are not being excluded at all! I am expecting 6 users ut "excludes" contains all 8 users instead. Since all I'm doing in GetMatchingUsers(IEnumerable users) is taking the IEnumerable and just returning the IUsers whose ID's match( 2 IUsers in this case), my understanding is that by default "Except" will use reference equality for comparing the objects to be excluded. Is this not how "Except" behaves? What is even more interesting is that if I materialize the objects using .ToList() and then get the matching users, and call "Except", everything works as expected! Like so: IEnumerable users = doc.Element("Users").Elements("User").Select (u = new User { ID = (int)u.Attribute("id"), Name = (string)u.Attribute("name") } ).OfType().ToList(); //explicity materializing all objects by calling ToList() var matches = User.GetMatchingUsers(users); var excludes = users.Except(matches); // excludes now contains 6 users as expected I don't see why I should need to materialize objects for calling "Except" given that its defined on IEnumerable? Any suggesstions / insights would be much appreciated.

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  • Catchall Router on Exim does not work

    - by Markus
    I have setup a catchall router on exim (used as last router): catchall: driver = redirect domains = +local_domains data = ${lookup{*@$domain}lsearch{/etc/aliases}} retry_use_local_part This works perfectly when sending emails locally. However, if I login to my GMail account and send an email to [email protected], then I get an "Unrouteable Address". Thank you for any hints to solve this issue.

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  • Application icon not transferred to Android device

    - by Praveenb
    I want to deploy my application with Android 2.1 features. I placed an application icon in PNG format in the drawable-ldpi,and drawable-hdpi folders. When I installed to the device, it is not showing the application icon on the home screen of the device. Please help me how to solve this issue?

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  • psql: FATAL: Ident authentication failed for user "postgres"

    - by morpheous
    I have installed PostgreSQL and pgAdminIII on my Ubuntu Karmic box. I am able to use pgAdminIII successfully (i.e. connect/log on), however when I try to login to the server using the same username/pwd on the command line (using psql), I get the error: psql: FATAL: Ident authentication failed for user "postgres" Does anyone now how to resolve this issue?

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  • Unable to get project info and source control from a particular machine

    - by Gerard
    From one particular machine, accounts are unable to get tfs project info and source control via the visual studio tfs client. The connection with the tfs server is made but the project content remains empty. Web access is possible from this machine. Note: from all other machines everything works normally, so it must be a local machine issue. What might be misconfigured on this machine? Otherwise there seem to be no problems on this XP machine.

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  • Eclipse adding your own build command

    - by user319873
    I am new to eclipse and wanted to do the following;- 1) how to use my custom build commands with eclipse. Till now I only saw make all?I use a shell script for building my project, how can I use that in eclipse environment. 2) When I create a new project with the existing source code, it doesn't add the files, without building the code and if code fails to build (because I generally don't have make all). How to resolve this issue

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  • PL/SQL execption and Java programs

    - by edwards
    Hi Business logic is coded in pl/sql paackages procedures and functions. Java programs call pl/sql packages procedures and functions to do database work. Issue now is pl/sql programs store excpetions into Oracle tables whenever a execption is raised. How would my java programs get the execptions since the exception instead of being propogated from pl/sql to java is getting persisted to a oracle table.

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  • Background image is not displayed in Firefox

    - by petersidor
    An image set as the background of a DIV is displayed in IE, but not in Firefox. CSS example: div.something { background:transparent url(../images/table_column.jpg) repeat scroll 0 0; } (The issue is described in many places but haven't seen any conclusive explanation or fix.)

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  • Handling multiple HTTP requests from one source (e.g.a hacker)

    - by Haraldo
    Hi there, I have a script to handle http requests. I'm trying to think of some of the security issues I might have with it. My biggest concern at the moment is how I can manage multiple requests from the same source over and over. For instance someone trying to shut down my system. Do I need to be concerned or will Apache handling this issue. If not what is the best approach to take using php? Thanks,

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  • CTE Join query issues

    - by Lee_McIntosh
    Hi everyone, this problem has me head going round in circles at the moment and i wondering if anyone could give any pointers as to where im going wrong. Im trying to produce a SPROC that produces a dataset to be called by SSRS for graphs spanning the last 6 months. The data for example purposes uses three tables (theres more but the it wont change the issue at hand) and are as follows: tbl_ReportList: Report Site ---------------- North abc North def East bbb East ccc East ddd South poa South pob South poc South pod West xyz tbl_TicketsRaisedThisMonth: Date Site Type NoOfTickets --------------------------------------------------------- 2010-07-01 00:00:00.000 abc Support 101 2010-07-01 00:00:00.000 abc Complaint 21 2010-07-01 00:00:00.000 def Support 6 ... 2010-12-01 00:00:00.000 abc Support 93 2010-12-01 00:00:00.000 xyz Support 5 tbl_FeedBackRequests: Date Site NoOfFeedBackR ---------------------------------------------------------------- 2010-07-01 00:00:00.000 abc 101 2010-07-01 00:00:00.000 def 11 ... 2010-12-01 00:00:00.000 abc 63 2010-12-01 00:00:00.000 xyz 4 I'm using CTE's to simplify the code, which is as follows: DECLARE @ReportName VarChar(200) SET @ReportName = 'North'; WITH TicketsRaisedThisMonth AS ( SELECT [Date], Site, SUM(NoOfTickets) AS NoOfTickets FROM tbl_TicketsRaisedThisMonth WHERE [Date] >= DATEADD(mm, DATEDIFF(m,0,GETDATE())-6,0) GROUP BY [Date], Site ), FeedBackRequests AS ( SELECT [Date], Site, SUM(NoOfFeedBackR) AS NoOfFeedBackR FROM tbl_FeedBackRequests WHERE [Date] >= DATEADD(mm, DATEDIFF(m,0,GETDATE())-6,0) GROUP BY [Date], Site ), SELECT trtm.[Date] SUM(trtm.NoOfTickets) AS NoOfTickets, SUM(fbr.NoOfFeedBackR) AS NoOfFeedBackR, FROM Reports rpts LEFT OUTER JOIN TotalIncidentsDuringMonth trtm ON rpts.Site = trtm.Site LEFT OUTER JOIN LoggedComplaints fbr ON rpts.Site = fbr.Site WHERE rpts.report = @ReportName GROUP BY trtm.[Date] And the output when the sproc is pass a parameter such as 'North' to be as follows: Date NoOfTickets NoOfFeedBackR ----------------------------------------------------------------------------------- 2010-07-01 00:00:00.000 128 112 2010-08-01 00:00:00.000 <data for that month> <data for that month> 2010-09-01 00:00:00.000 <data for that month> <data for that month> 2010-10-01 00:00:00.000 <data for that month> <data for that month> 2010-11-01 00:00:00.000 <data for that month> <data for that month> 2010-12-01 00:00:00.000 122 63 The issue I'm having is that when i execute the query I'm given a repeated list of values of each month, such as 128 will repeat 6 times then another value for the next months value repeated 6 times, etc. argh!

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  • Proper way to use multiple stylesheets...so it WORKS?

    - by thatryan
    I am making a site where I need to have styles separated for layout, colors and typography. So basically I took my main style sheet and just copied it 3 times, and in removed everything but coloring from one, everything but type related in another and etc. But when I link to them now there must be some cascade issue or something, because a lot of the type stuff is not being applied. Is there a proper way to do this?

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  • How to make Edittext size stay put? Android

    - by Sephy
    Hi everybody, I know the attribute which makes the text "disapear" on the left part of the Edittext to maintain a single line, (singleLine="true"). Btu my issue is when I fill the edittext before the view is displayed... in this case, my edittexts are all going out of the screen... any ideas? thx

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  • Undoing branch creation in Mercurial

    - by michaelmior
    How can I undo the creation of a branch in Mercurial? For example, if I issue the command hg branch newbranch How can I delete this branch if I decide I entered the wrong name? I'm guessing this must be pretty simple to do, but I have yet to figure it out. Thanks!

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  • Not getting content in Excel sheet after exporting using DynamicJasper in grails

    - by Ravi
    Hi. I am new to grails and jasper reports. Please help me with the issue. I am trying one example on how to save in excel format the data that we display in grails. I am able to save as excel but not able to get anything inside excel sheet after opening it, not even columns. Refer the link http://www.wysmedia.com/2009/05/dance-with-dynamic-jasper-report/ for the example I am trying. Many thanks.

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  • IIS Not Serving PHP pages

    - by Isaac Levin
    I have followed these instructions exactly, yet I get a "Page cannot be found" 404 error http://learn.iis.net/page.aspx/247/using-fastcgi-to-host-php-applications-on-iis-60/ My PHP file is <?php phpinfo(); ?> I am running Windows Server 2003 and installed FastCGI and made sure everything is correct per those instructions. I can also create an HTML page and that serves no problem, so it must be an issue with PHP. Any help would be appreciated, thanks!

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  • What is the equivalent of REGEXP_SUBSTR in mysql?

    - by KandadaBoggu
    I want to extract a word from a string column of a table. description =========================== abc order_id: 2 xxxx yyy aa mmm order_id: 3 nn kk yw Expected result set order_id =========================== 2 3 Table will at most have 100 rows, text length is ~256 char and column always has one order_id present. So performance is not an issue. In Oracle, I can use REGEXP_SUBSTR for this problem. How would I solve this in MySQL?

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  • android : sax Xml parsing

    - by Ram
    Team, I am facing some issue at the time of parsing the XML, but the same works in Java program... When I run the same code through android prgming its failing to parse... InputStream byteArrayInputStream = new ByteArrayInputStream( response.toString().getBytes()); SAXParser parser = SAXParserFactory.newInstance().newSAXParser(); parser.parse(byteArrayInputStream, xmlHandler); Facing the following error DTD handlers aren't supported Any help is greatly appreciated. Thanks, Ramesh

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