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  • joining tables while keeping the Null values

    - by Tam
    I have two tables: Users: ID, first_name, last_name Networks: user_id, friend_id, status I want to select all values from the users table but I want to display the status of specific user (say with id=2) while keeping the other ones as NULL. For instance: If I have users: 1 John Smith 2 Tom Summers 3 Amy Wilson And in networks: user_id friend_id status 2 1 friends I want to do search for John Smith for all other users so I want to get: id first_name last_name status 2 Tom Summers friends 3 Amy Wilson NULL I tried doing LEFT JOIN and then WHERE statement but it didn't work because it excluded the rows that have relations with other users but not this user. I can do this using UNION statement but I was wondering if it's at all possible to do it without UNION.

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  • What are the pros and cons to keeping SQL in Stored Procs versus Code

    - by Guy
    What are the advantages/disadvantages of keeping SQL in your C# source code or in Stored Procs? I've been discussing this with a friend on an open source project that we're working on (C# ASP.NET Forum). At the moment, most of the database access is done by building the SQL inline in C# and calling to the SQL Server DB. So I'm trying to establish which, for this particular project, would be best. So far I have: Advantages for in Code: Easier to maintain - don't need to run a SQL script to update queries Easier to port to another DB - no procs to port Advantages for Stored Procs: Performance Security

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  • Moving and renaming files, keeping extension but include sub directories in batch file

    - by Ser1esII
    Forgive me if this is nor the place to ask these questions, I am new to batch and scripts and a bit new to these kind of posts... I have a folder that will receive files and folders, I want to run a script that looks at the directory and renames all files in each subfolder numerically, and moves them if possible. For example I have something that looks like the following Recieved_File_Folder |_folder1 | |_file1.txt | |_file2.bmp |_folder2 | |_file4.exe | |_file5.bmp |__file9.txt |__file10.jpg I would like to be able to look in every directory and move it to something like this, keeping in mind the names of the files will be random and I want to keep the extension intact also. Renamed_Folder |_folder1 | |_1.txt | |_2.bmp |_folder2 | |_1.exe | |_2.bmp |__1.txt |__2.jpg I have spent alot of time on this and am not doing too well with it, any help would be very greatly appreciated!! Thank you in advance!

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  • Keeping connection to APNs open on App Engine using Modules in Go

    - by user3727820
    I'm trying to implement iOS push notifications for a messageboard app I've written (so like notification for new message ect. ect.) but have no real idea where to start. Alot the current documentation seems to be out of date in regard to keeping persistent TLS connections open to the APNs from App Engine and links to articles about depreciated backends I'm using the Go runtime and just keep getting stuck. For instance, the creation of the socket connection to APNs requires a Context which can only be got from a HTTP request, but architecturally this doesn't seem to make a lot of sense because ideally the socket remains open regardless. Is there any clearer guides around that I'm missing or right now is it a better idea to setup a separate VPS or compute instance to handle it?

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  • Practices for keeping JavaScript and CSS in sync?

    - by Rene Saarsoo
    I'm working on a large JavaScript-heavy app. Several pieces of JavaScript have some related CSS rules. Our current practice is for each JavaScript file to have an optional related CSS file, like so: MyComponent.js // Adds CSS class "my-comp" to div MyComponent.css // Defines .my-comp { color: green } This way I know that all CSS related to MyComponent.js will be in MyComponent.css. But the thing is, I all too often have very little CSS in those files. And all too often I feel that it's too much effort to create a whole file to just contain few lines of CSS - it would be easier to just hardcode the styles inside JavaScript. But this would be the path to the dark side... Lately I've been thinking of embedding the CSS directly inside JavaScript - so it could still be extracted in the build process and merged into one large CSS file. This way I wouldn't have to create a new file for every little CSS-piece. Additionally when I move/rename/delete the JavaScript file I don't have to additionally move/rename/delete the CSS file. But how to embed CSS inside JavaScript? In most other languages I would just use string, but JavaScript has some issues with multiline strings. The following looks IMHO quite ugly: Page.addCSS("\ .my-comp > p {\ font-weight: bold;\ color: green;\ }\ "); What other practices have you for keeping your JavaScript and CSS in sync?

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  • What to do when ServerSocket throws IOException and keeping server running

    - by s5804
    Basically I want to create a rock solid server. while (keepRunning.get()) { try { Socket clientSocket = serverSocket.accept(); ... spawn a new thread to handle the client ... } catch (IOException e) { e.printStackTrace(); // NOW WHAT? } } In the IOException block, what to do? Is the Server socket at fault so it need to be recreated? For example wait a few seconds and then serverSocket = ServerSocketFactory.getDefault().createServerSocket(MY_PORT); However if the server socket is still OK, then it is a pity to close it and kill all previously accepted connections that are still communicating. EDIT: After some answers, here my attempt to deal with the IOException. Would the implementation be guaranteeing keeping the server up and only re-create server socket when only necessary? while (keepRunning.get()) { try { Socket clientSocket = serverSocket.accept(); ... spawn a new thread to handle the client ... bindExceptionCounter = 0; } catch (IOException e) { e.printStackTrace(); recreateServerSocket(); } } private void recreateServerSocket() { while (keepRunning) { try { logger.info("Try to re-create Server Socket"); ServerSocket socket = ServerSocketFactory.getDefault().createServerSocket(RateTableServer.RATE_EVENT_SERVER_PORT); // No exception thrown, then use the new socket. serverSocket = socket; break; } catch (BindException e) { logger.info("BindException indicates that the server socket is still good.", e); bindExceptionCounter++; if (bindExceptionCounter < 5) { break; } } catch (IOException e) { logger.warn("Problem to re-create Server Socket", e); e.printStackTrace(); try { Thread.sleep(30000); } catch (InterruptedException ie) { logger.warn(ie); } } } }

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  • Good tools for keeping the content in test/staging/live environments synchronized

    - by David Stratton
    I'm looking for recommendations on automated folder synchronization tools to keep the content in our three environments synchronized automatically. Specifically, we have several applications where a user can upload content (via a File Upload page or a similar mechanism), such as images, pdf files, word documents, etc. In the past, we had the user doing this to our live server, and as a result, our test and staging servers had to be manually synchronized. Going forward, we will have them upload content to the staging server, and we would like some software to automatically copy the files off to the test and live servers EITHER on a scheduled basis OR as the files get uploaded. I was planning on writing my own component, and either set it up as a scheduled task, or use a FileSystemWatcher, but it occurred to me that this has probably already been done, and I might be better off with some sort of synchronization tool that already exists. On our web site, there are a limited number of folders that we want to keep synchronized. In these folders, it is an all or nothing - we want to make sure the folders are EXACT duplicates. This should make it fairly straightforward, and I would think that any software that can synchronize folders would be OK, except that we also would like the software to log changes. (This rules out simple BATCH files.) So I'm curious, if you have a similar environment, how did you solve the challenge of keeping everything synchronized. Are you aware of a tool that is reliable, and will meet our needs? If not, do you have a recommendation for something that will come close, or better yet, an open source solution where we can get the code and modify it as needed? (preferably .NET). Added Also, I DID google this first, but there are so many options, I am interested mostly in knowing what actually works well vs what they SAY works, which is why I'm asking here.

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  • Keeping updated with the latest technologies.

    - by Prashanth
    I am a software developer and I have been programming since the past six years. I simply love the mental challenge involved in trying to come up with solutions to hard problems, reading up programming literature, blogs by prominent developers and so on. I work on Microsoft platform and I have trouble keeping up with the pace at which various frameworks are rolled out. Remoting,WCF,ASP.NET,ASP.NET MVC, LINQ, WPF, WWF, OSLO, ADO.NET data services, DSL tools etc etc. Even understanding all these frameworks at an abstract level and see how they are all tied up with MS vision itself is a major hurdle. Now when you add other non microsoft technologies, programming languages etc to the equation, I wonder how do people manage? Given that there are only 24 hours in a day, how does one keep himself updated about so many technology changes that happen everyday? My question is , is it even worth doing that? The thing is, I am also interested in other fields such as literature, science. I try my best to at least gain a superficial understanding of what is happening in other fields of my interest and don't want to give up on that :)

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  • How to reduce a data frame keeping the order for other columns

    - by betabandido
    I am trying to reduce a data frame using the max function on a given column. I would like to preserve other columns but keeping the values from the same rows where each maximum value was selected. An example will make this explanation easier. Let us assume we have the following data frame: dframe <- data.frame(list(BENCH=sort(rep(letters[1:4], 4)), CFG=rep(1:4, 4), VALUE=runif(4 * 4) )) This gives me: BENCH CFG VALUE 1 a 1 0.98828096 2 a 2 0.19630597 3 a 3 0.83539540 4 a 4 0.90988296 5 b 1 0.01191147 6 b 2 0.35164194 7 b 3 0.55094787 8 b 4 0.20744004 9 c 1 0.49864470 10 c 2 0.77845408 11 c 3 0.25278871 12 c 4 0.23440847 13 d 1 0.29795494 14 d 2 0.91766057 15 d 3 0.68044728 16 d 4 0.18448748 Now, I want to reduce the data in order to select the maximum VALUE for each different BENCH: aggregate(VALUE ~ BENCH, dframe, FUN=max) This gives me the expected result: BENCH VALUE 1 a 0.9882810 2 b 0.5509479 3 c 0.7784541 4 d 0.9176606 Next, I tried to preserve other columns: aggregate(cbind(VALUE, CFG) ~ BENCH, dframe, FUN=max) This reduction returns: BENCH VALUE CFG 1 a 0.9882810 4 2 b 0.5509479 4 3 c 0.7784541 4 4 d 0.9176606 4 Both VALUE and CFG are reduced using max function. But this is not what I want. For instance, in this example I would like to obtain: BENCH VALUE CFG 1 a 0.9882810 1 2 b 0.5509479 3 3 c 0.7784541 2 4 d 0.9176606 2 where CFG is not reduced, but it just keeps the value associated to the maximum VALUE for each different BENCH. How could I change my reduction in order to obtain the last result shown?

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  • Keeping a web app project organized?

    - by user246114
    Hi, I'm writing a web app, using jsp to create the page content. I need a pretty good amount of javascript to make the app work. Does anyone have any recommendations on how to structure my project, such that it doesn't become a mess? This is a broad question, but the basic problem is that I'm insert javascript code directly into my jsp content. Then I might have some external js files. Ids and such are strewn between multiple files. I'm not really sure what a best practice is for keeping this type of project organized. Do you always keep your javascript in separate files? There has to be a few hooks in the jsp pages though for them, right? I tried using GWT because I'm really a c/java developer, and I was hoping it would help keep my project more organized (definitely helps) - but GWT is a pain to use with jsp, it really wants you to do all UI generation client side after the page is done loading, doesn't work for what I need to do. Again, broad question, any tips would be great, Thanks

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  • Keeping WPF grids from getting out of parent bounds

    - by Jonathan Perry
    In my UI, I have a big grid with two columns and one row. in the right column, I have a grid with three rows where in the top row I have a user control, and in the two bottom rows I have two Expander objects, each containing an ItemsControl with a list that gets populated in runtime. Sometimes, that list gets really long and "spills" from the screen towards the bottom. What I want to do is to allow the user to see both expanders, be able to expand or collapse them while keeping them both in sight. I tried wrapping them in WrapPanels or StackPanel but to no avail. Here's some code to help explain my problem: <Grid Grid.Row="1" x:Name="grid1"> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <Expander Grid.Row="0" Header="Expander 1" x:Name="expander1" FontSize="14" IsExpanded="True"> <Expander.Background> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FFC4C4C4" Offset="0" /> <GradientStop Color="White" Offset="1" /> </LinearGradientBrush> </Expander.Background> <ContentPresenter Content="{Binding ViewModel.OpenAlerts, ElementName=m_viewControl}" ClipToBounds="True"/> </Expander> <Expander Grid.Row="1" x:Name="expander2" Header="Expander 2" FontSize="14" IsExpanded="True"> <Expander.Background> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FFC4C4C4" Offset="0" /> <GradientStop Color="White" Offset="1" /> </LinearGradientBrush> </Expander.Background> <ContentPresenter Content="{Binding ViewModel.ClosedAlerts, ElementName=m_viewControl}" ClipToBounds="True"/> </Expander> </Grid> Any assistance or tips will be highly appreciated! Thanks, John.

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  • Keeping the row in edit mode after saveRow in jqgrid

    - by Chirantan
    I want to be able to keep the row in edit mode even after calling saveRow() function in jQgrid. This is because I want to be able to validate the data being saved and remove the edit mode only when the data has passed its validations. I am aware of the succesfunc, which gets called after successful posting of data. I get the response handle too, however, manually calling the editRow(row_id); function does not seem to work. Is there anyway, I can keep the row in edit mode after calling saveRow?

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  • Wix XmlFile is keeping SqlDatabase from creating databases

    - by Grandpappy
    I've got a Wix project made up of several fragments. One of those fragments has the database components, another has a component that manipulates xml files. When I include the XmlFile element to manipulate a file, the databases defined by the SqlDatabase do not get created. If I comment out the XmlFile, then the databases do get created. Here are the two wix files with fragments that are being used: Database: <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi" xmlns:sql="http://schemas.microsoft.com/wix/SqlExtension"> <Fragment> <DirectoryRef Id="TARGETDIR"> <Component Id="Database1Creation" Guid="GUID_HERE"> <sql:SqlDatabase Id="Database1" Server="[DATABASE_SERVER]" Database="[DATABASE_NAME]" CreateOnInstall="yes" ConfirmOverwrite="no" DropOnUninstall="yes"> </sql:SqlDatabase> </Component> </DirectoryRef> </Fragment> </Wix> Xml Manipulation: <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi" xmlns:sql="http://schemas.microsoft.com/wix/SqlExtension" xmlns:util="http://schemas.microsoft.com/wix/UtilExtension"> <Fragment> <Directory Id="TARGETDIR" Name="SourceDir"> <Directory Id="ProgramFilesFolder"> <Directory Id="INSTALLDIR" Name="MyDirectory"> <Component Id="ServiceExecutables" Guid="GUID_HERE"> <File Id="File1" Name="File1.xml" Source="Source/File1.xml" /> <util:XmlFile Id="UpdateFile1" File="[INSTALLDIR]File1.xml" Action="setValue" ElementPath="//SomeContainer/SomeElement" Value="[SOME_VALUE]" /> </Component> </Directory> </Directory> </Directory> </Fragment> </Wix> There are other things that are also installed, but they don't appear to have any influence on the issue (I've removed everything else and tested the install). When looking at the install logs when using XmlFile and when not, they are almost exact copies of each other, except that the SqlDatabase calls would be completely missing, and the XmlFile calls would be in their place. Is there a known bug here? Or am I doing something I shouldn't be? This isn't a killer for our app, since I can move the things I'm putting in the xml file into the registry, but I'd rather not do that. I am using Wix 3.5.

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  • iphone - keeping the last frame of a frame animation visible

    - by Mike
    I have this code UIImageView *sequence = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"balao_surge0.png"]]; NSMutableArray *array = [[NSMutableArray alloc] init] ; for (int i=0; i<30; i++) { UIImage *oneImage = [UIImage imageNamed:[NSString stringWithFormat:@"balao_surge%d.png",i]]; [array addObject:oneImage]; } sequence.animationImages = array; sequence.animationDuration = 2.0; sequence.animationRepeatCount = 1; [umaVista addSubview:sequence]; [sequence release]; sequence.startAnimating; The animation plays fine, but after the last frame is shown, it vanishes. I would like to make it stay visible, that is, make the animation stop on the last frame. Is there any way to do that? thanks for any help.

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  • JQuery tablesorter - Keeping grouped subheaders together, but still sorted

    - by hfidgen
    Hiya, I'm not really a Javascript programmer, so I'm struggling with this! I'm using the tablesorter plugin along with the Tablegroup plugin, which work very nicely to group the table rows by a parent, and then sort the parents. My problem is though, that I'd also like the child rows to be sorted whilst within the parent group I've done my best to get this working but I'm afraid I've hit a wall. Can anyone suggest a new starter for 10? The example below is working fine - There are 2x groups here: Nordics (Norway and Denmark) DACH (Germany and Austria) If I click on the header row, the groups are sorted, but the child rows within the group are not sorted. <script type="text/javascript"> $(document).ready(function () { $(".tablesorter") .tablesorter({ // set default sort column sortList: [[0,0]], // don't sort by first column headers: {0: {sorter: false}} , onRenderHeader: function (){ this.wrapInner("<span></span>"); } , debug: true }) }); </script> <table id="results-header" class="grid tablesorter table-header" cellpadding="0" cellspacing="0" border="0"> <thead> <tr class="title"> <th class="countries">&nbsp;</th> <th>% market share</th> <th>% increase in mkt share</th> <th>Target achieved</th> <th>% targets</th> <th>% sales inc. M-o-M</th> <th>% sales inc. M-o-M for country</th> <th>% training</th> </tr> </thead> <tbody> <tr id="Nord" class="collapsible parent parent-even collapsed"> <td class="countries">Nordics</td> <td>39.5</td> <td>49</td> <td>69.8</td> <td>51.8</td> <td>43</td> <td>42.5</td> <td>38</td> </tr> <tr id="row-Norway" class="expand-child child child-Nord"> <td class="countries">Norway</td> <td>6</td> <td>45</td> <td>101</td> <td>10</td> <td>20</td> <td>40</td> <td>30</td> </tr> <tr id="row-Denmark" class="expand-child child child-Nord"> <td class="countries">Denmark</td> <td>10</td> <td>20</td> <td>3</td> <td>40</td> <td>50</td> <td>25</td> <td>8</td> </tr> <tr id="DACH" class="collapsible parent parent-odd collapsed"> <td class="countries">DACH</td> <td>77</td> <td>61</td> <td>43</td> <td>98</td> <td>65</td> <td>92.5</td> <td>59.5</td> </tr> <tr id="row-Germany" class="expand-child child child-DACH"> <td class="countries">Germany</td> <td>56</td> <td>24</td> <td>84</td> <td>98</td> <td>32</td> <td>87</td> <td>21</td> </tr> <tr id="row-Austria" class="expand-child child child-DACH"> <td class="countries">Austria</td> <td>98</td> <td>98</td> <td>2</td> <td>98</td> <td>98</td> <td>98</td> <td>98</td> </tr> </tbody> </table>

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  • Merge Word Documents (Office Interop & .NET), Keeping Formatting

    - by mbmccormick
    I'm having some difficulty merging multiple word documents together using Microsoft Office Interop Assemblies (Office 2007) and ASP.NET 3.5. I'm able to merge the documents, but some of my formatting is missing (namely the fonts and images). My current merge code is shown below. private void CombineDocuments() { object wdPageBreak = 7; object wdStory = 6; object oMissing = System.Reflection.Missing.Value; object oFalse = false; object oTrue = true; string fileDirectory = @"C:\documents\"; Microsoft.Office.Interop.Word.Application WordApp = new Microsoft.Office.Interop.Word.Application(); Microsoft.Office.Interop.Word.Document wDoc = WordApp.Documents.Add(ref oMissing, ref oMissing, ref oMissing, ref oMissing); string[] wordFiles = Directory.GetFiles(fileDirectory, "*.doc"); for (int i = 0; i < wordFiles.Length; i++) { string file = wordFiles[i]; wDoc.Application.Selection.Range.InsertFile(file, ref oMissing, ref oMissing, ref oMissing, ref oFalse); wDoc.Application.Selection.Range.InsertBreak(ref wdPageBreak); wDoc.Application.Selection.EndKey(ref wdStory, ref oMissing); } string combineDocName = Path.Combine(fileDirectory, "Merged Document.doc"); if (File.Exists(combineDocName)) File.Delete(combineDocName); object combineDocNameObj = combineDocName; wDoc.SaveAs(ref combineDocNameObj, ref m_WordDocumentType, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing); } I don't care necessarily how this is accomplished. It could output via PDF if it had to. I just want the formatting to carry over. Any help or hints that you could provide me with would be appreciated! Thanks!

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  • Login From Multiple Services, Keeping Profiles in Sync

    - by viatropos
    Given the following: I have an application that allows people to login through twitter, myspace, yahoo, and google User creates initial account by logging in through Google User logs out User logs back in using Yahoo. ...is there a recommended way for the application to associate those two accounts together? Stack Overflow has this functionality but it seems like they need the user to manually say "this account google account is associated with that yahoo one". Is there no way to do this automatically?

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  • Recommendations for keeping a build server updated

    - by gareth_bowles
    As a guy who frequently switches between QA, build and operations, I keep running into the issue of what to do about operating system updates on the build server. The dichotomy is the same on Windows, Linux, MacOS or any other o/s that can update itself via the internet: The QA team wants to keep the build server exactly as it is from the beginning of the product release cycle to the end, since installing updates could destabilize the server and means that successive builds aren't made against the same baseline. The ops team wants the software to be deployed on a system with all the latest security patches; this can mean that the software isn't deployed on exactly the same version of the o/s that it was built on. I usually mitigate this by taking release candidate builds and installing them on a test server that has a completely up-to-date o/s, repeating the automated tests that are run on the build server and doing some additional system level testing to make sure everything looks good before deployment. However, this seems inefficient to me; does anyone have a better way ?

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  • Keeping footer visible and height 100% in CSS

    - by vtortola
    I'm trying to create a very simple page that contains a container, a header, a left column and a footer: <containter> <header /> <content /> <leftBar /> <footer /> </containter> I want to use the 100% of the height, as I can do with the width, but I simply dont get it work.At his moment I'm usingmin-height, but how could I use theheight:100%` ? What I like is that the footer is always visible, and you scroll the content. Current CSS body { font-family: Verdana; font-size: 0.8em; background-color:#f1f1f1; } #container { border:solid 2px Black; position:absolute; left:10%; width:80%; margin:auto; } #header { height:20px; background: #DDDDDD; } #leftBar { width: 20%; background: #669966; min-height:600px; postion:absolute; top:20px; bottom:20px; } #content { float:right; background-color: #cdcde6; position:absolute; left:20%; right:0px; bottom:20px; top:20px; padding:5px; } #footer { position:absolute; height:20px; }

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  • keeping references to inflated custom views

    - by darren
    Hi While researching how to create custom compound views in Android, I have come across this pattern a lot (example comes from the Jteam blog) : public class FirstTab extends LinearLayout { private ImageView imageView; private TextView textView; private TextView anotherTextView; public FirstTab(Context context, AttributeSet attributeSet) { super(context, attributeSet); LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); inflater.inflate(R.layout.firstTab, this); } } I mostly understand how this is working, except for the part where inflate() is called. The documentation says that this method returns a View object, but in this example the author does not store the result anywhere. After inflation, how is the new View created fromt eh XML associated with this class? I thought about assigning it to "this", but that seems very wrong. thanks for any clarification.

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  • Remove duplicates from a sorted ArrayList while keeping some elements from the duplicates

    - by js82
    Okay at first I thought this would be pretty straightforward. But I can't think of an efficient way to solve this. I figured a brute force way to solve this but that's not very elegant. I have an ArrayList. Contacts is a VO class that has multiple members - name, regions, id. There are duplicates in ArrayList because different regions appear multiple times. The list is sorted by ID. Here is an example: Entry 0 - Name: John Smith; Region: N; ID: 1 Entry 1 - Name: John Smith; Region: MW; ID: 1 Entry 2 - Name: John Smith; Region: S; ID: 1 Entry 3 - Name: Jane Doe; Region: NULL; ID: 2 Entry 4 - Name: Jack Black; Region: N; ID: 3 Entry 6 - Name: Jack Black; Region: MW; ID: 3 Entry 7 - Name: Joe Don; Region: NE; ID: 4 I want to transform the list to below by combining duplicate regions together for the same ID. Therefore, the final list should have only 4 distinct elements with the regions combined. So the output should look like this:- Entry 0 - Name: John Smith; Region: N,MW,S; ID: 1 Entry 1 - Name: Jane Doe; Region: NULL; ID: 2 Entry 2 - Name: Jack Black; Region: N,MW; ID: 3 Entry 3 - Name: Joe Don; Region: NE; ID: 4 What are your thoughts on the optimal way to solve this? I am not looking for actual code but ideas or tips to go about the best way to get it done. Thanks for your time!!!

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  • ASP.Net MVC Keeping action parameters between postbacks

    - by Matt
    Say I have a page that display search results. I search for stackoverflow and it returns 5000 results, 10 per page. Now I find myself doing this when building links on that page: <%=Html.ActionLink("Page 1", "Search", new { query=ViewData["query"], page etc..%> <%=Html.ActionLink("Page 2", "Search", new { query=ViewData["query"], page etc..%> <%=Html.ActionLink("Page 3", "Search", new { query=ViewData["query"], page etc..%> <%=Html.ActionLink("Next", "Search", new { query=ViewData["query"], page etc..%> I dont like this, I have to build my links with careful consideration to what was posted previously etc.. What I'd like to do is <%=Html.BuildActionLinkUsingCurrentActionPostData ("Next", "Search", new { Page = 1}); where the anonymous dictionary overrides anything currently set by previous action. Essentially I care about what the previous action parameters were, because I want to reuse, it sounds simple, but start adding sort and loads of advance search options and it starts getting messy. Im probably missing something obvious

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  • Keeping the DI-container usage in the composition root in Silverlight and MVVM

    - by adrian hara
    It's not quite clear to me how I can design so I keep the reference to the DI-container in the composition root for a Silverlight + MVVM application. I have the following simple usage scenario: there's a main view (perhaps a list of items) and an action to open an edit view for one single item. So the main view has to create and show the edit view when the user takes the action (e.g. clicks some button). For this I have the following code: public interface IView { IViewModel ViewModel {get; set;} } Then, for each view that I need to be able to create I have an abstract factory, like so public interface ISomeViewFactory { IView CreateView(); } This factory is then declared a dependency of the "parent" view model, like so: public class SomeParentViewModel { public SomeParentViewModel(ISomeViewFactory viewFactory) { // store it } private void OnSomeUserAction() { IView view = viewFactory.CreateView(); dialogService.ShowDialog(view); } } So all is well until here, no DI-container in sight :). Now comes the implementation of ISomeViewFactory: public class SomeViewFactory : ISomeViewFactory { public IView CreateView() { IView view = new SomeView(); view.ViewModel = ???? } } The "????" part is my problem, because the view model for the view needs to be resolved from the DI-container so it gets its dependencies injected. What I don't know is how I can do this without having a dependency to the DI-container anywhere except the composition root. One possible solution would be to have either a dependency on the view model that gets injected into the factory, like so: public class SomeViewFactory : ISomeViewFactory { public SomeViewFactory(ISomeViewModel viewModel) { // store it } public IView CreateView() { IView view = new SomeView(); view.ViewModel = viewModel; } } While this works, it has the problem that since the whole object graph is wired up "statically" (i.e. the "parent" view model will get an instance of SomeViewFactory, which will get an instance of SomeViewModel, and these will live as long as the "parent" view model lives), the injected view model implementation is stateful and if the user opens the child view twice, the second time the view model will be the same instance and have the state from before. I guess I could work around this with an "Initialize" method or something similar, but it doesn't smell quite right. Another solution might be to wrap the DI-container and have the factories depend on the wrapper, but it'd still be a DI-container "in disguise" there :) Any thoughts on this are greatly appreciated. Also, please forgive any mistakes or rule-breaking, since this is my first post on stackoverflow :) Thanks! ps: my current solution is that the factories know about the DI-container, and it's only them and the composition root that have this dependency.

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