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• Should I learn C?

  - by Justin Standard

  Original Question: Should I Learn C? In the theme of the stackoverflow podcast, here's a fun question: should I learn C? I expect Jeff & Joel will have something to say on this. Some info on my background: Primarily a Java programmer on "enterprisy" systems. Favorite languages: python, scheme 7 years programming experience A very small amount of C++ experience, practically no C experience No immediate "need" to learn C So should I learn C? If so, why? If not, why? C or Assembly? Lots of folks recomending Assembler, so add on question: Is it better to learn C or Assembler? If Assembler, which one? Recommended assemblers so far: Motorolla 68000 Intel Assembler (does he mean x86?) MASM32

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• notepad sql Unicode and Non Unicode

  - by RBrattas

  Hi, I have a Microsoft Notepad flate file with data and Vertical Bar as column delimiter. I get following message: cannot convert between unicode and non-unicode string data types It seems it is my nvarchar(max) that creates my problem. I changed to varchar(max); but still the same problem. And in the SQL Server 2005 import and export wizard the flate file source advanced tab the OutputColumnWith is 50. Will that say my flate file column is max 50? I hope not because my column is more then 50... Thank you, Rune

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• notepad sql Unicode and Non Unicode

  - by RBrattas

  Hi, I have a Microsoft Notepad flate file with data and Vertical Bar as column delimiter. I get following message: cannot convert between unicode and non-unicode string data types It seems it is my nvarchar(max) that creates my problem. I changed to varchar(max); but still the same problem. How do I insert my flate file into my SQL Server 2005? And in the SQL Server 2005 import and export wizard the flate file source advanced tab the OutputColumnWith is 50. Will that say my flate file column is max 50? I hope not because my column is more then 50... Thank you, Rune

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• Fill spinner from cursor in android

  - by Rickard

  Hi, i have searched for a awnser for this for a while today. It all looks so easy but i never get it to work. I want to fill a spinner with my cursor. I have been trying to use SimpleCursorAdapter for this as a lot of sites say i shall but i never get it to work. Show me just how easy it is :) Thanks for your time! My cursor Cursor cursor = db.query(DATABASE_TABLE_Clients, new String[] {"_id", "C_Name"}, null, null, null, null, "C_Name"); My spinner (Spinner) findViewById(R.id.spnClients); My Code Cursor cursor_Names = SQLData.getClientNames(); startManagingCursor(cursor_Names); String[] columns = new String[] { "C_Name" }; int[] to = new int[] { R.id.txt_Address }; SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_spinner_dropdown_item, cursor_Names, columns, to); Spinner spnClients = (Spinner) findViewById(R.id.spnClients); spnClients.setAdapter(mAdapter);

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• Launch market place with id of an application that doesn't exist in the android market place

  - by Gaurav

  Hi, I am creating an application that checks the installation of a package and then launches the market-place with its id. When I try to launch market place with id of an application say com.mybrowser.android by throwing an intent android.intent.action.VIEW with url: market://details?id=com.mybrowser.android, the market place application does launches but crashes after launch. Note: the application com.mybrowser.android doesn't exists in the market-place. MyApplication is my application. $ adb logcat I/ActivityManager( 1030): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=myapp.testapp/.MyApplication } I/ActivityManager( 1030): Start proc myapp.testapp for activity myapp.testapp/.MyApplication: pid=3858 uid=10047 gids={1015, 3003} I/MyApplication( 3858): [ Activity CREATED ] I/MyApplication( 3858): [ Activity STARTED ] I/MyApplication( 3858): onResume D/dalvikvm( 1109): GC freed 6571 objects / 423480 bytes in 73ms I/MyApplication( 3858): Pressed OK button I/MyApplication( 3858): Broadcasting Intent: android.intent.action.VIEW, data: market://details?id=com.mybrowser.android I/ActivityManager( 1030): Starting activity: Intent { act=android.intent.action.VIEW dat=market://details?id=com.mybrowser.android flg=0x10000000 cmp=com.android.ven ding/.AssetInfoActivity } I/MyApplication( 3858): onPause I/ActivityManager( 1030): Start proc com.android.vending for activity com.android.vending/.AssetInfoActivity: pid=3865 uid=10023 gids={3003} I/ActivityThread( 3865): Publishing provider com.android.vending.SuggestionsProvider: com.android.vending.SuggestionsProvider D/dalvikvm( 1030): GREF has increased to 701 I/vending ( 3865): com.android.vending.api.RadioHttpClient$1.handleMessage(): Handle DATA_STATE_CHANGED event: NetworkInfo: type: WIFI[], state: CONNECTED/CO NNECTED, reason: (unspecified), extra: (none), roaming: false, failover: false, isAvailable: true I/ActivityManager( 1030): Displayed activity com.android.vending/.AssetInfoActivity: 609 ms (total 7678 ms) D/dalvikvm( 1030): GC freed 10458 objects / 676440 bytes in 128ms I/MyApplication( 3858): [ Activity STOPPED ] D/dalvikvm( 3865): GC freed 3538 objects / 254008 bytes in 84ms W/dalvikvm( 3865): threadid=19: thread exiting with uncaught exception (group=0x4001b180) E/AndroidRuntime( 3865): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception E/AndroidRuntime( 3865): java.lang.RuntimeException: An error occured while executing doInBackground() E/AndroidRuntime( 3865): at android.os.AsyncTask$3.done(AsyncTask.java:200) E/AndroidRuntime( 3865): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) E/AndroidRuntime( 3865): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) E/AndroidRuntime( 3865): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) E/AndroidRuntime( 3865): at java.util.concurrent.FutureTask.run(FutureTask.java:137) E/AndroidRuntime( 3865): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068) E/AndroidRuntime( 3865): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561) E/AndroidRuntime( 3865): at java.lang.Thread.run(Thread.java:1096) E/AndroidRuntime( 3865): Caused by: java.lang.NullPointerException E/AndroidRuntime( 3865): at com.android.vending.AssetItemAdapter$ReloadLocalAssetInformationTask.doInBackground(AssetItemAdapter.java:845) E/AndroidRuntime( 3865): at com.android.vending.AssetItemAdapter$ReloadLocalAssetInformationTask.doInBackground(AssetItemAdapter.java:831) E/AndroidRuntime( 3865): at android.os.AsyncTask$2.call(AsyncTask.java:185) E/AndroidRuntime( 3865): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) E/AndroidRuntime( 3865): ... 4 more I/Process ( 1030): Sending signal. PID: 3865 SIG: 3 I/dalvikvm( 3865): threadid=7: reacting to signal 3 I/dalvikvm( 3865): Wrote stack trace to '/data/anr/traces.txt' I/DumpStateReceiver( 1030): Added state dump to 1 crashes D/AndroidRuntime( 3865): Shutting down VM W/dalvikvm( 3865): threadid=3: thread exiting with uncaught exception (group=0x4001b180) E/AndroidRuntime( 3865): Uncaught handler: thread main exiting due to uncaught exception E/AndroidRuntime( 3865): java.lang.NullPointerException E/AndroidRuntime( 3865): at com.android.vending.controller.AssetInfoActivityController.getIdDeferToLocal(AssetInfoActivityController.java:637) E/AndroidRuntime( 3865): at com.android.vending.AssetInfoActivity.displayAssetInfo(AssetInfoActivity.java:556) E/AndroidRuntime( 3865): at com.android.vending.AssetInfoActivity.access$800(AssetInfoActivity.java:74) E/AndroidRuntime( 3865): at com.android.vending.AssetInfoActivity$LoadAssetInfoAction$1.run(AssetInfoActivity.java:917) E/AndroidRuntime( 3865): at android.os.Handler.handleCallback(Handler.java:587) E/AndroidRuntime( 3865): at android.os.Handler.dispatchMessage(Handler.java:92) E/AndroidRuntime( 3865): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime( 3865): at android.app.ActivityThread.main(ActivityThread.java:4363) E/AndroidRuntime( 3865): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime( 3865): at java.lang.reflect.Method.invoke(Method.java:521) E/AndroidRuntime( 3865): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) E/AndroidRuntime( 3865): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) E/AndroidRuntime( 3865): at dalvik.system.NativeStart.main(Native Method) I/Process ( 1030): Sending signal. PID: 3865 SIG: 3 W/ActivityManager( 1030): Process com.android.vending has crashed too many times: killing! D/ActivityManager( 1030): Force finishing activity com.android.vending/.AssetInfoActivity I/dalvikvm( 3865): threadid=7: reacting to signal 3 D/ActivityManager( 1030): Force removing process ProcessRecord{44e48548 3865:com.android.vending/10023} (com.android.vending/10023) However, when I try to launch the market place for a package that exists in the market place say com.opera.mini.android, everything works. Log for this case: D/dalvikvm( 966): GC freed 2781 objects / 195056 bytes in 99ms I/MyApplication( 1165): Pressed OK button I/MyApplication( 1165): Broadcasting Intent: android.intent.action.VIEW, data: market://details?id=com.opera.mini.android I/ActivityManager( 78): Starting activity: Intent { act=android.intent.action.VIEW dat=market://details?id=com.opera.mini.android flg=0x10000000 cmp=com.android.vending/.AssetInfoActivity } I/AndroidRuntime( 1165): AndroidRuntime onExit calling exit(0) I/WindowManager( 78): WIN DEATH: Window{44c72308 myapp.testapp/myapp.testapp.MyApplication paused=true} I/ActivityManager( 78): Process myapp.testapp (pid 1165) has died. I/WindowManager( 78): WIN DEATH: Window{44c72958 myapp.testapp/myapp.testapp.MyApplication paused=false} D/dalvikvm( 78): GC freed 31778 objects / 1796368 bytes in 142ms I/ActivityManager( 78): Displayed activity com.android.vending/.AssetInfoActivity: 214 ms (total 22866 ms) W/KeyCharacterMap( 978): No keyboard for id 65540 W/KeyCharacterMap( 978): Using default keymap: /system/usr/keychars/qwerty.kcm.bin V/RenderScript_jni( 966): surfaceCreated V/RenderScript_jni( 966): surfaceChanged V/RenderScript( 966): setSurface 480 762 0x573430 D/ViewFlipper( 966): updateRunning() mVisible=true, mStarted=true, mUserPresent=true, mRunning=true D/dalvikvm( 978): GC freed 10065 objects / 624440 bytes in 95ms Any ideas? Thanks in advance!

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• Filter a model's attributes before outputting as json

  - by Jorge Israel Peña

  Hey guys, I need to output my model as json and everything is going fine. However, some of the attributes need to be 'beautified' by filtering them through some helper methods, such as number_to_human_size. How would I go about doing this? In other words, say that I have an attribute named bytes and I want to pass it through number_to_human_size and have that result be output to json. I would also like to 'trim' what gets output as json if that's possible, since I only need some of the attributes. Is this possible? Can someone please give me an example? I would really appreciate it.

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• Bidirectional Serialization with Linq

  - by Andy

  Anyone know why only undirectional serialization is supported in the Linq designer? Consider the following example: Say we have a Customer who requested an Order containing Products. We set the Serialization Mode in the Linq designer to Unidirectional to enable serialization. When looking at the code for the Order object, the DataMember attribute is added to all its internal properties such as ID,OrderNumber, etc. and also to the EntitySet of Products, but not to Customer. One can get around this by manually adding the DataMember attribute to Customer, but this becomes quite cumbersome when there's loads of entities in the database.

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• Using DCMTK in iOS application

  - by BlackFlam3

  I want to use DCMTK in my application and have successfully compiled DCMTK 3.6.0 for the iOS Simulator. Then I created a workspace into which I added the DCMTK project and my application. I added the .a files as target dependencies and linked the binaries. I think I am missing the part where I have to set the header/library search paths. I try to include a header file say #include "dcm2xml.h" and it says file not found. What am I doing wrong? I have seen this. - how to use dcmtk in iphone project But I think there's a simpler way without using that framework.

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• iPhone Provisioning: What's it all about?

  - by david van brink

  Grepping around, I see that I'm not AT ALL alone in being... challenged... by the process of setting up an iPhone app, getting it to run, giving it my testers, and so on. I've gotten it to work. Somehow I emailed a copy or two to testers, and eventually got my li'l app into the store, and that was fine. But I can't say a really, deeply understand it! (And I don't do iDev every day. Even now my recollection of what I did is kind-of hazy.) I'm moderately capable of understanding things, if presented, well, you know, in a way I can understand. Can anyone point me to a crystal clear explanation of what provisioning actually is? I feel that if I understood it, the recipes to do it would be obvious. Thanks!

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• Device Driver IRQL and Thread/Context Switches

  - by Christian Hoglund

  Hi, I'm new to Windows device driver programming. I know that certain operations can only be performed at IRQL PASSIVE_LEVEL. For example, Microsoft have this sample code of how to write to a file from a kernel driver: if (KeGetCurrentIrql() != PASSIVE_LEVEL) return STATUS_INVALID_DEVICE_STATE; Status = ZwCreateFile(...); My question is this: What is preventing the IRQL from being raised after the KeGetCurrentIrql() check above? Say a context or thread swithch occurs, couldn't the IRQL suddenly be DISPATCH_LEVEL when it gets back to my driver which would then result in a system crash? If this is NOT possible then why not just check the IRQL in the DriverEntry function and be done with it once for all?

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• Convert Environment.OSVersion to NTDDI version format

  - by David Brown

  In sdkddkver.h of the Windows Platform SDK, there are various OS versions defined as NTDDI_*. For example, Windows XP and its service packs are defined as: #define NTDDI_WINXP 0x05010000 #define NTDDI_WINXPSP1 0x05010100 #define NTDDI_WINXPSP2 0x05010200 #define NTDDI_WINXPSP3 0x05010300 #define NTDDI_WINXPSP4 0x05010400 There are also masks which, along with the OSVER, SPVER, and SUBVER macros, allow you to pull the respective parts out of the NTDDI version. #define OSVERSION_MASK 0xFFFF0000 #define SPVERSION_MASK 0x0000FF00 #define SUBVERSION_MASK 0x000000FF I have all of these defined as constants in C# and what I'd like to do now is convert the data returned by Environment.OSVersion to a value corresponding to one of the NTDDI versions in sdkddkver.h. I could make a massive switch statement, but that's not really as future-proof as I'd like it to be. I would need to update the conversion method every time a new OS or service pack is released. I have a feeling this could be done with the help of some bitwise operators, but I'll be honest and say that those aren't my strong point. I appreciate any help!

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• What is a proper way to pass a parameter to Set-Alias in powershell?

  - by Nick Gorbikoff

  Hello. A little background: I use PowerShell on windows xp at work and I set a bunch of useful shortcuts in Microsoft.PowerShell_profile.ps1 in My Documents, trying to emulate Mac environment inspired by Ryan Bates's shortcuts I have things like: Set-Alias rsc Rails-Console function Rails-Console {Invoke-Expression "ruby script/console"} Which works just fine when in command prompt I say: rsc #it calls the proper command However this doesn't work properly Set-Alias rsg Rails-Generate function Rails-Generate {Invoke-Expression "ruby script/generate"} So when I do : rsg model User which is supposed to call ruby script/generate model User all it calls is ruby script/generate #Dumping my params So how would I properly modify my functions to take params I send to functions? Thank you!!

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• BlackBerry Simulator & BIS Push Service

  - by Submerged

  I am hoping that someone knows if you can use RIMM's push service with BIS WITHOUT a hand held device. I have registered for the push evaluation and I want to program a push server that will send out notifications to BB clients. I got my email this morning containing: Server: Application: XXXXXXXXXXXXXXXXXXX Pwd: xxxXXXXX CPID (Content Provider ID):xxx Start Date (MM/DD/YYYY): X/X/XXXX Expiry Date (MM/DD/YYYY):X/X/XXXX First Name:XXXXXXX Last Name:XXXXX Email:[email protected] Account Type:Plus Source IP:xxx.xxx.xxx.xxx Usage:BIS AND Client: Application Credentials (for use in your client application): Application ID:XXX-xxxxxxxxxxxxxxx Push Port:xxxxx I am hoping someone can tell me where to get started - as an iPhone developer, I have to say, there is much more information. Lastly, if I DO need a device, does that device have to have a dataplan? I wanted to be able to serve my clients from WiFi as well, does the BB push system work only on Cell networks? Thank you

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• Why aren't we programming on the GPU???

  - by Chris

  So I finally took the time to learn CUDA and get it installed and configured on my computer and I have to say, I'm quite impressed! Here's how it does rendering the Mandelbrot set at 1280 x 678 pixels on my home PC with a Q6600 and a GeForce 8800GTS (max of 1000 iterations): Maxing out all 4 CPU cores with OpenMP: 2.23 fps Running the same algorithm on my GPU: 104.7 fps And here's how fast I got it to render the whole set at 8192 x 8192 with a max of 1000 iterations: Serial implemetation on my home PC: 81.2 seconds All 4 CPU cores on my home PC (OpenMP): 24.5 seconds 32 processors on my school's super computer (MPI with master-worker): 1.92 seconds My home GPU (CUDA): 0.310 seconds 4 GPUs on my school's super computer (CUDA with static domain decomposition): 0.0547 seconds So here's my question - if we can get such huge speedups by programming the GPU instead of the CPU, why is nobody doing it??? I can think of so many things we could speed up like this, and yet I don't know of many commercial apps that are actually doing it. Also, what kinds of other speedups have you seen by offloading your computations to the GPU?

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• Composite Key Dictionary

  - by AaronLS

  I have some objects in List, let's say List<MyClass> and MyClass has several properties. I would like to create an index of the list based on 3 properties of of MyClass. In this case 2 of the properties are int's, and one property is a datetime. Basically I would like to be able to do something like: Dictionary< CompositeKey , MyClass > MyClassListIndex = Dictionary< CompositeKey , MyClass >(); //Populate dictionary with items from the List<MyClass> MyClassList MyClass aMyClass = Dicitonary[(keyTripletHere)]; I sometimes create multiple dictionaries on a list to index different properties of the classes it holds. I am not sure how best to handle composite keys though. I considered doing a checksum of the three values but this runs the risk of collisions.

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• WPF ListView column auto sizing

  - by Diego Mijelshon

  Let's say I have the following ListView: <ListView ScrollViewer.VerticalScrollBarVisibility="Auto"> <ListView.View> <GridView> <GridViewColumn Header="Something" DisplayMemberBinding="{Binding Path=ShortText}" /> <GridViewColumn Header="Description" DisplayMemberBinding="{Binding Path=VeryLongTextWithCRs}" /> <GridViewColumn Header="Something Else" DisplayMemberBinding="{Binding Path=AnotherShortText}" /> </GridView> </ListView.View> </ListView> I'd like the short text columns to always fit in the screen, and the long text column to use the remaining space, word-wrapping if necessary. Is that possible?

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• How do I return an Array from grails / jdo to Flex

  - by mswallace

  this seems really simple but I haven't gotten this to work. I am building my app with grails on google app engine. This pretty much requires you to use JDO. I am making an HTTP call from flex to my app. The action that I am calling on the grails end looks like so def returnShowsByDate = { def query = persistenceManager.newQuery( Show ) def showInstanceList = query.execute() return (List<Show>) showInstanceList } I have tried just returning "hello from grails" and that works just fine. I have alos tried the following return showInstanceList the JDO docs say the query.execute() returns a collection. Why I cant just return that to Flex I have no clue. Any thoughts?

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• force lifecycle prerequisite for maven plugin execution?

  - by nsayer

  I use the maven-properties-plugin during the initialization phase to read in a bunch of properties from a properties file. I also have the jetty plugin configured to set a couple of the project properties - including those read in above - as system properties to jetty. If I run the result as mvn initialize jetty:run-war it works. If I just say mvn jetty:run-war it fails. How can I force a goal specified on the command line to run in a lifecycle that includes the initialization phase?

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• Android: Custom view based on layout: how?

  - by Peterdk

  I am building a Android app and I am a bit struggling with custom Views. I would like to have a reusable View that consist of a few standard layout elements. Let's say a relativelayout with some buttons in it. How should I proceed. Should I create a custom view class that extends RelativeLayout and programmaticly add those buttons? I would think that's a bit overkill? What's the way to do it properly in Android?

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• Tutorial: Simple WCF XML-RPC client

  - by mr.b

  Update: I have provided complete code example in answer below. I have built my own little custom XML-RPC server, and since I'd like to keep things simple, on both server and client side, what I would like to accomplish is to create a simplest possible client (in C# preferably) using WCF. Let's say that Contract for service exposed via XML-RPC is as follows: [ServiceContract] public interface IContract { [OperationContract(Action="Ping")] string Ping(); // server returns back string "Pong" [OperationContract(Action="Echo")] string Echo(string message); // server echoes back whatever message is } So, there are two example methods, one without any arguments, and another with simple string argument, both returning strings (just for sake of example). Service is exposed via http. Aaand, what's next? :)

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• Java Compare Two Lists

  - by agazerboy

  Hi All, Thanks for stoping to help me :) I have a question, may be for some of you, it will be a basic question :) I have two lists ( not java lists, you can say two columns) For example **List 1** **Lists 2** milan hafil dingo iga elpha binga hafil mike meat dingo iga neeta.peeta What I want ! I want that it returns me that how many elements are same. For this example it should be 3 and it should return me similar values of both list and different values too. Should I use hashmap if yes then what method to get my result? Please help P.S: It is not a school assignment :) So if you just guide me it will be enough

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• Avoiding .NET versioning hell

  - by moogs

  So sometimes (oftentimes!) you want to target a specific .NET version (say 3.0), but then due to some .NET service packs you get into problems like: Dispatcher.BeginInvoke(Delegate, Object[]) <-- this was added in 3.0 SP2 (3.0.30618 ) System.Threading.WaitHandle.WaitOne(Int32) <-- this was added in 3.5 SP1, 3.0 SP2, 2.0 SP2 Now, these are detected by the JIT compiler, so building against .NET 3.0 in Visual Studio won't guarante it will run on .NET 3.0 only systems. Short of confirming each and every function you use, or limiting your development environment to .NET 3.0 (which sucks since you have to develop for other projects too) what's the best way to avoid against using extensions? Thanks!

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• UpdatePanel + ToolkitScriptManager work in FF but blows up in IE 6+

  - by Hans Gruber

  I just upgraded my ASP.NET application from AjaxToolkit version 1.0 to version 3.5. The only code that I had to change as a result of the upgrade was to replace instances of ScriptManager with ToolKitScriptManager. UpdatePanels that used to work flawlessly in both FF and IE6+ now only work in FF. The specific problem in IE is twofold: PostBackTriggers don't perform any PostBack at all (i.e button clicks do nothing) AsyncPostBackTriggers do perform an async PostBack, but outside of a single hidden field (created by the ToolKitScriptManager itself) no ViewState is being sent back to the server for any controls. Needless to say, controls tend to fail in rather spectacular fashion when they can't access their ViewState during a PostBack. :) The only thing I can think of that would account for this only failing in IE6+, is that there is some malformed JavaScript getting piped down that FF is able to work around/ignore but that causes IE to self-destruct Downgrading to the 1.0 version of AjaxToolkit would probably fix this issue, but there are several key features in the 3.5 I need to leverage so this would be painful. Thanks for reading!

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• nfs client on ubuntu 9.10, /etc/init.d/nfs-common does not exist

  - by Denali

  This seems like a trivial problem, but I can not find a solution for several days now. I am trying to configure an nfs client on ubuntu 9.10 (64 bit). All the tutorials I've read say I need to restart a few things, such as portmap, and also nfs-common. Specifically: sudo /etc/init.d/nfs-common restart However, this file (/etc/init.d/nfs-common) does not exist. sudo apt-get install nfs-common returns "nfs-common is already the newest version." When I try: sudo service nfs restart I get: nfs: unrecognized service What am I missing here? Thank you to the kind soul who can help me with this.

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• StructureMap : How to define default constructor by code ?

  - by cik

  Hi, I can't figure out how to define the default constructor (when it exists overloads) for a type in StructureMap (version 2.5) by code. I want to get an instance of a service and the container has to inject a Linq2Sql data context instance into it. I wrote this in my 'bootstrapper' method : ForRequestedType<MyDataContext>().TheDefault.Is.OfConcreteType<MyDataContext>(); When I run my app, I got this error : StructureMap Exception Code: 202 No Default Instance defined for PluginFamily MyNamespace.Data.SqlRepository.MyDataContext, MyNamespace.Data, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null If I comment out all Linq2Sql generated contructors that I don't need, it works fine. Update : Oh, and I forgot to say that I would not use the [StructureMap.DefaultConstructor] attribute.

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