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• Entity Framework: Setting EntityReference EntityKey causes exception on save

  - by NYSystemsAnalyst

  I have a table with a ModifiedUserID field that is a foreign key to a User table. In entity framework, I'm loading the first table, but not the users table. I have the user ID of the current user, and would like to set the ModifiedUserID to that value for all entities that have been modified prior to saving. Before calling SaveChanges(), I use the ObjectStateManager to get all modified entities. Since I do not have the user object, but I do have the user ID, I set the EntityReference.EntityKey property as follows: entity.UserReference.EntityKey = New EntityKey("MyContainer.User", "UserID", DatabaseUserID) This works fine, but when I execute SaveChanges(), I receive the following error: A relationship is being added or deleted from an AssociationSet 'FK_Table1_User'. With cardinality constraints, a corresponding 'Table1' must also be added or deleted. Now, I see that setting the EntityReference.EntityKey creates a new AssociationSet entry, but how to I prevent this error?

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• calling a service from an activity

  - by newbie

  Hi,I have been stuck on this issue for quite some time now.Have read the documentation and many tutorials and they just confuse me more.I hope someone will provide me a straightforward answer.It's really important.Thank you.. Ok ..so i want an activity to get some input from the user as and then send that string to a service.Then i want my service to run in a way so that i can use other applications while this one keeps running in the background.Also i don't want the service to keep running every second.What i want is for the service to get updated location of my current position every 10 minutes so i was thinkin if there could be a way to make my service to go to sleep n wake up evry 10 mins n check for updates.I don't want to show the update on the UI so i dont think i need to use an AIDL approach and also dont need to bind to the service.I js simply want to start the service as soon as the user enters the string and keep the service runing every 10 mins.I think it is really simple but m very confused.Please help.

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• which toString() method can be used performance wise??

  - by Mrityunjay

  hi, I am working on one project for performance enhancement. I had one doubt, while we are during a process, we tend to trace the current state of the DTO and entity used. So, for this we have included toString() method in all POJOs for the same. I have now implemented toString() in three different ways which are following :- public String toString() { return "POJO :" + this.class.getName() + " RollNo :" + this.rollNo + " Name :" + this.name; } public String toString() { StringBuffer buff = new StringBuffer("POJO :").append(this.class.getName()).append(" RollNo :").append(this.rollNo).append(" Name :").append(this.name); return buff.toString(); } public String toString() { StringBuilder builder = new StringBuilder("POJO :").append(this.class.getName()).append(" RollNo :").append(this.rollNo).append(" Name :").append(this.name); return builder .toString(); } can anyone please help me to find out which one is best and should be used for enhancing performance.

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• Architecting a generic search result web control

  - by Bartek Tatkowski

  In a project I'm currently working for we've stumbled upon the need for several kinds of search results presentation controls. The search result are similar, but not identical. For example, in the "office search" result we might want to present the office name and location, while in the "document search" could contain document name, author and publishing date. These fields should be sortable. My current strategy is to employ the Factory pattern and do something like this: ISearchResult officeResults = SearchResultFactory.CreateOfficeSearchResults(data); ISearchResult documentResults = SearchResultFactory.CreateDocumentSearchResults(data); The problem is: I don't know how to implement the markup code. Should I just do Controls.Add(officeResults); in the containing page? Or is there some ASPX trickery to create generic web controls? Or maybe I'm overthinking this and just should create five classes? ;)

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• Moving from WCF RIA RC to Release: best practices?

  - by Duncan Bayne

  I have an existing WCF RIA project built on the Release Candidate; I'm now moving to the Release version & have discovered many changes. David Scruggs made the following comment on his (MSDN) blog: "If you’ve written anything in SIlverlight 4 RIA Services, you’ll need to rewrite it. There has been a lot of refactoring and namespace moves." Having made a brief attempt to compile the old solution with the new RIA framework I'm inclined to agree. My current plan is to: remove the Silverlight Business Application projects from the Solution rebuild the EF4 items from the database create a new Silverlight Business Application project re-add the files (XAML, CS) from the old Silverlight Business Application project Does this sound like a reasonable approach? I think it's cleaner than trying to manually alter the existing project.

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• R: How to update a package and keep it from reverting to the original?

  - by John

  I want to upgrade the package ggplot2: library(ggplot2) packageDescription("ggplot2")["Version"] > 0.8.3 But the current version is 0.8.7. I tried update.packages(), which seemed to work OK. But it still returned older version 0.8.3. So I downloaded and installed the package source from Cran, which says 0.8.7 in the download page. I then install it via the GUI menu in R. It returns ** building package indices ... * DONE (ggplot2) I then run: packageDescription("ggplot2")["Version"] > 0.8.3 And still I have the older version! I don't know why this is not working, what's more I had already come across this problem before and solved it (I can't remember exactly what) but now it has gone back to the older version! What's the easiest way to keep packages like this updated automatically and not have them refer back to older packages?

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• What issues carry the highest risk in a software project?

  - by Mehrdad Afshari

  Clearly, software projects are different from other industries in terms of many things like for instance, quality assurance, project progress measurement, and many other things. Unique characteristics of software projects also makes the risk management process unique. Lots of issues in a project might lead it to unacceptable delay or failure to deliver business value. They might even make a complete disaster in the project. What are the deadliest risk factors in a software project? How to analyze, prevent and handle them? Particularly, I'm interested in the issues that you can detect from the beginning and you should keep an eye on (for example, you might be told about a third-party API that the current application uses and lacks documentation). Please share your experiences if they are relevant.

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• Best way to test if a generic type is a string? (c#)

  - by Rex M

  I have a generic class that should allow any type, primitive or otherwise. The only problem with this is using default(T). When you call default on a value type or a string, it initializes it to a reasonable value (such as empty string). When you call default(T) on an object, it returns null. For various reasons we need to ensure that if it is not a primitive type, then we will have a default instance of the type, not null. Here is attempt 1: T createDefault() { if(typeof(T).IsValueType) { return default(T); } else { return Activator.CreateInstance<T>(); } } Problem - string is not a value type, but it does not have a parameterless constructor. So, the current solution is: T createDefault() { if(typeof(T).IsValueType || typeof(T).FullName == "System.String") { return default(T); } else { return Activator.CreateInstance<T>(); } } But this feels like a kludge. Is there a nicer way to handle the string case?

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• More efficient way to find & tar millions of files

  - by Stu Thompson

  I've got a job running on my server at the command line prompt for a two days now: find data/ -name filepattern-*2009* -exec tar uf 2008.tar {} ; It is taking forever, and then some. Yes, there are millions of files in the target directory. But just running... find data/ -name filepattern-*2009* -print > filesOfInterest.txt ...takes only two hours or so. At the rate my job is running, it won't be finished for a couple of weeks.. That seems unreasonable. Is there a more efficient to do this? Maybe with a more complicated bash script? A secondary questions is "why is my current approach so slow?"

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• Html + Css: How to create a auto-resizing rotated background?

  - by Sebastian P.R. Gingter

  Hi, image a complete black web page. On this web page is a 100% size white div that fills the whole page. I'd like to rotate this div by -7 degrees (or 7 degrees counter-clock wise). This will result in the black background being visible in triangles on the edges, just like you had placed a piece of paper on a desk and turned it a bit to the left. Actually this can be done with some css and it's working quite well (except for IE). The real problem now is: I'd like to have a normal, non-rotated div element on top of that to display the content in, so that only the background is rotated. Rotating a contained div counterwise doesn't work though, because through the two transformations the text will be blurry in all browsers. How can I realize that? Best would be a solution workiing in current Webkit browsers, FF3.5+ and IE7+. If only IE8+ I could live with that too.

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• Attaching files to WCF REST service responses

  - by David Seiler

  I have a resource that looks something like this: /users/{id}/summary?format={format} When format is "xml" or "json" I respond with a user summary object that gets automagically encoded by WCF - fine so far. But when format equals "pdf", I want my response to consist of a trivial HTTP response body and a PDF file attachment. How is this done? Hacking on WebOperationContext.Current.OutgoingResponse doesn't seem to work, and wouldn't be the right thing even if it did. Including the bits of the file in a CDATA section or something in the response isn't safe. Should I create a subclass of Message, then provide a custom IDispatchMessageFormatter that responds with it? I went a short distance down that path but ultimately found the documentation opaque. What's the right thing?

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• Load balancing and shedulling algorithms .NET

  - by Lukas Šalkauskas

  Hello there, so here is my problem: I have several different configuarion servers. I have different calculations (jobs), I can predict how long approx. each job will take to be caclulated. Also I have priorities. My question is how to keep all machines loaded 99-100% and shedule the jobs in the best way. Each machine can do several calculations at the time. Jobs are pushed to the machine. Central machine knows current load of each machine. Also I would like to to assign some king of machine learning here, because I will know statistics of each job (started, finished, cpu load etc.). How to distribute jobs(calculations) in the best possible way, also keep in mind priority. Any suggestions ? Ideas ? Algorithms ?

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• How exactly does a program convert everything to UTF-8 internally?

  - by xyld

  does it use setlocale()? does it assume utf-8 for all input strings when in a UTF-8 locale? I understand what unicode is and how it is related to utf-8, but how does one "convert to it" internally with all their strings? How does it convert all input strings to UTF-8? Does it use a C library function? Does the current working locale have to be a UTF-8 locale? UPDATE: if specific technical details could be in your answer, that would be great as that is more along the lines of what I'm looking for. I already understand the reasons for using UTF-8 internally and why it makes dealing with multiple locales much simpler.

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• Updating the getDistanceFrom between two annotations in MapKit

  - by Krismutt

  Hey everybody! I wanna have a UILabel that shows the distance between two annotations... but how do I get it to update the distance each time the current location is updated (location)?? CLLocationCoordinate2 savedPlace = savedPosition; CLLocationCoordinate2D currentPlace = location; CLLocation *locCurrent = [[CLLocation alloc] initWithLatitude:currentPlace.latitude longitude:currentPlace.longitude]; CLLocation *locSaved = [[CLLocation alloc] initWithLatitude:savedPlace.latitude longitude:savedPlace.longitude]; CLLocationDistance distance = [locSaved distanceFromLocation:locCurrent]; [showDistance setText:[NSString stringWithFormat:@"%g", distance]]; Thanks in advance!

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• Timer applications running under lock on Windows Phone 7

  - by cpedros

  Under the current Windows Phone 7 Application Certification Requirements (pdf) applications running under lock must "stop any ... active timers" (section 6.3.1). However looking out on Marketplace there are a number of timer/stopwatch apps claiming to run under lock and also allow lock to be disabled in their settings. How are these apps certified or is there some loosening on the restrictions by Microsoft if the app allows the user to make that decision? Also some of these apps also suggest they continue even when the app is exited or when the device off. Is it the case that they are not truly running under these circumstances, i.e. the timers either start where they left off when reactivated, or perhaps use the OS time to work out the time elapsed between tombstoning and reactivation? In these circumstance I also presume it is not possible for the app to notify the user when the timer completes?

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• .NET Framework - When to Upgrade?

  - by Andrew

  I’m faced with a challenge of leading two (currently) separate .NET development groups with different development strategies. One group is developing on the .NET Framework 2.0 (with maybe a few applications on 3.5). The other group immediately adopts any new framework that comes out, and begins coding any new applications with it (they are running 2.0-4.0 applications). For this last group, applications written in an earlier version than the latest framework do not get upgraded. What is the current school of thought when it comes to a company developing web applications on when to adopt a new framework, and whether to migrate applications built on previous versions to the latest framework or not? Years ago the thought was to wait until the technology became mainstream - but that doesn't seem to apply much now with .NET.

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• workflow assign task to multiple users

  - by Artru

  I have MOSS. I want to make a page where a user, say administrator, could send some instructions to a server, for example using standard library and make task for a group of users forcing them to read files. After the reading users would press "already read it" and administrator would know who did it/who did not. I created simple workflow in office designer and choose assigne task to Group1, which is in the sharepoint server. After WF run everyone who is in Group1 get message about a task, that's great. However this task is general for group and if we go to the site section "current tasks", we can see it, while I want this task for every person in Group1. Futher question, is it possible to create form where administrator will choose users for this task, 'cause now I munualy set group in WF.

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• Displaying change of content through parent

  - by Mikhail

  I have DHTML content inside a fieldset. This includes plain html, nested objects (even other fieldsets), and value change of input, select, and textarea objects. I'd like to change the border of the fieldset if the contents have been changed. The following works: $('fieldset[name=qsfs127]').children('input').change(function(){ $(this).parent('fieldset').css({border:'1px solid red'}); }) This handles the input; I can extend it to select and textarea. Questions: How can I do the same for html changes? Can all of this change-tracking be done by comparing current html() to stored one? If yes for (2), will this handle cases of "undo"? Edit: I have a button that ajax-uploads contents, and saves the changes. I then remove the border color

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• MySQL - Selecting rows with a minimum number of occurences

  - by RC

  Hi all, I have this query: SELECT DISTINCT brand_name FROM masterdata WHERE in_stock = '1' ORDER BY brand_name It works well, except that I get far too many results. How do I limit this such that rather than just looking for distinct entries, it will only give me distinct entries that exist a minimum of 3 times (for example)? Basically, if the column had this data... brand_name ========== apple banana apple apple orange banana orange orange ...my current query would return "apple, banana, orange". How do I get it such that it only returns "apple, orange" (ignoring banana because it has less than three occurrences)? I'm using PHP to build the query, if it matters. Thanks!

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• Strange Error - "Object moved to here."

  - by Dkong

  I get the strange error "Object moved to here." on a blank white page when I try to login on a site I created. It works fine locally but not when I deploy it to the test or production server. I am not doing anything odd, just using basic authentication code in a helper function as follows... public static bool AuthenticateUser(string Username, string Password, bool PersistLogin, string RedirectionURL) { if (Membership.ValidateUser(Username, Password)) { FormsAuthentication.SetAuthCookie(Username, PersistLogin); HttpContext.Current.Response.Redirect(RedirectionURL,true); return true; } else return false; }

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• Changing background image on accordion change - jQuery Ui

  - by Coughlin

  I am using this code: $('.ui-accordion').bind('accordionchange', function(event, ui) { $(this).next().next().css({'background-image':'images/green-bg.jpg'}); //ui.newHeader // jQuery object, activated header //ui.oldHeader // jQuery object, previous header // ui.newContent // jQuery object, activated content // ui.oldContent // jQuery object, previous content }); To try to change the background image of the PREVIOUS header after it changes. I see that the jquery docs supply the object for oldHeader, but I am trying to change the CSS of that element. Any ideas how I would do that? So You go to the next one it goes green, then the current one is going to be red. Thanks, Ryan

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• How to properly reserve identity values for usage in a database?

  - by esac

  We have some code in which we need to maintain our own identity (PK) column in SQL. We have a table in which we bulk insert data, but we add data to related tables before the bulk insert is done, thus we can not use an IDENTITY column and find out the value up front. The current code is selecting the MAX value of the field and incrementing it by 1. Although there is a highly unlikely chance that two instances of our application will be running at the same time, it is still not thread-safe (not to mention that it goes to the database everytime). I am using the ADO.net entity model. How would I go about 'reserving' a range of id's to use, and when that range runs out, grab a new block to use, and guarantee that the same range will not be used.

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• How do I refactor this IEnumerable<T> to be thread-safe?

  - by DayOne

  I am looking at Skeet's AtomicEnumerable but I'm not sure how to integrate it into my current IEnumerable exmaple below (http://msmvps.com/blogs/jon_skeet/archive/2009/10/23/iterating-atomically.aspx) Basically I want to foreach my blahs type in a thread-safe way. thanks public sealed class Blahs : IEnumerable<string> { private readonly IList<string> _data = new List<string>() { "blah1", "blah2", "blah3" }; public IEnumerator<string> GetEnumerator() { return _data.GetEnumerator(); } IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); } }

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• Convert SVN Subdirectory to Git

  - by magneticMonster

  I would like to ditch SVN for Git. My current SVN repository setup has projects under trunk (/trunk/projecta, /trunk/projectb, etc. with tags and branches at /tags/projecta-1.0, etc.). I would like to create distinct Git repos for each of these projects by pulling them out of SVN using git-svn. I've successfully pulled the entire SVN repo down to a local Git repo but all of the projects exist in the same Git repo now. Is it possible to pull them apart at this point?

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• Python - from file to data structure?

  - by Seafoid

  Hi, I have large file comprising ~100,000 lines. Each line corresponds to a cluster and each entry within each line is a reference i.d. for another file (protein structure in this case), e.g. 1hgn 1dju 3nmj 8kfn 9opu 7gfb 4bui I need to read in the file as a list of lists where each line is a sublist, thus preserving the integrity of the cluster, e.g. nested_list = [['1hgn', '1dju', '3nmj', '8kfn'], ['9opu', '7gfb'], ['4bui']] My current code creates a nested list but the entries within each list are a single string and not comma separated. Therefore, I cannot splice the list with indices so easily. Any help greatly appreciated. Thanks, S :-)

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