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  • How to find out if an object's type implements IEnumerable<X> where X derives from Base using Reflec

    - by Dave Van den Eynde
    Give a base class "Base", I want to write a method Test, like this: private static bool Test(IEnumerable enumerable) { ... } such that Test returns true if the type of o implements any interface of IEnumerable where X derives from Base, so that if I would do this: public static IEnumerable<string> Convert(IEnumerable enumerable) { if (Test(enumerable)) { return enumerable.Cast<Base>().Select(b => b.SomePropertyThatIsString); } return enumerable.Cast<object>().Select(o => o.ToString()); } ...that it would do the right thing, using Reflection. I'm sure that its a matter of walking across all the interfaces of the type to find the first that matches the requirements, but I'm having a hard time finding the generic IEnumerable< among them. Of course, I could consider this: public static IEnumerable<string> Convert(IEnumerable enumerable) { return enumerable.Cast<object>().Select(o => o is Base ? ((Base)o).SomePropertyThatIsString : o.ToString()); } ...but think of it as a thought experiment.

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  • Efficiently Determine if EF 4 POCO Already in ObjectSet

    - by Eric J.
    I'm trying EF 4 with POCO's on a small project for the first time. In my Repository implementation, I want to provide a method AddOrUpdate that will add a passed-in POCO to the repository if it's new, else do nothing (as the updated POCO will be saved when SaveChanges is called). My first thought was to do this: public void AddOrUpdate(Poco p) { if (!Ctx.Pocos.Contains<Poco>(p)) { Ctx.Pocos.AddObject(p); } } However that results in a NotSupportedException as documented under Referencing Non-Scalar Variables Not Supported (bonus question: why would that not be supported?) Just removing the Contains part and always calling AddObject results in an InvalidStateException: An object with the same key already exists in the ObjectStateManager. The existing object is in the Unchanged state. An object can only be added to the ObjectStateManager again if it is in the added state. So clearly EF 4 knows somewhere that this is a duplicate based on the key. What's a clean, efficient way for the Repository to update Pocos for either a new or pre-existing object when AddOrUpdate is called so that the subsequent call to SaveChanges() will do the right thing? I did consider carrying an isNew flag on the object itself, but I'm trying to take persistence ignorance as far as practical.

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  • ADO.net, Check if ObjectContext is writeable

    - by user287107
    I have an embedded database in an asp.net mvc project. If I try to write to the file, I sometimes get a write failed exception because the SQL Server can't write to the file. How can I check an ObjectContext, if its writeable, without actually writing something to the database?

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  • How do I get a list of child elements from XDocument object?

    - by Nick
    Hello.. I am trying to get all of the "video" elements and their attributes from an XML file that looks like this: <?xml version="1.0" encoding="utf-8" ?> <videos> <video title="video1" path="videos\video1.wma"/> <video title="video2" path="videos\video2.wma"/> <video title="video3" path="videos\video3.wma"/> </videos> The following will only select the root node and all of the children. I would like to get all of the 'video' elements into the IEnumerable. Can someone tell me what I'm doing wrong? IEnumerable<XElement> elements = from xml in _xdoc.Descendants("videos") select xml; The above returns a collection with a length == 1. It contains the root element and all the children.

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  • EF4 cross database relationships

    - by Daniel
    Hello all, I was wondering if EF4 support cross-databse relationships? For instance: db1 Author Id Name db2 Posts Id Content db1.Author.Id What ideally I need to do to get this relation in my ef4 model? Do you guys have any idea? Thanks

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  • Create/Edit/Save data in a jQuery pop-up for ASP.NET-MVC and Linq2Sql

    - by RememberME
    I have a MVC page which allows creation and editing of a subcontract. When the user has to select a company for the subcontract, I would like for them to have the option to create a new company. I've made a jQuery pop-up with the company fields, but I don't know how to then save this information to the company table. I would also like to be able to use the same pop-up to allow the user to edit the information for an existing company, but need direction in how to send the information to the pop-up.

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  • Passing viewmodel to actionresult creates new viewmodel

    - by Jonas Bohez
    I am using a viewmodel, which i then when to send to an actionresult to use (the modified viewmodel) But in the controller, i lose the list and objects in my viewmodel. This is my view: @using PigeonFancier.Models @model PigeonFancier.Models.InschrijvingModel @using (Html.BeginForm("UpdateInschrijvingen","Melker",Model)) { <div> <fieldset> <table> @foreach (var item in Model.inschrijvingLijst) { <tr> <td>@Html.DisplayFor(model => item.Duif.Naam)</td> <td> @Html.CheckBoxFor(model => item.isGeselecteerd)</td> </tr> } </table> <input type="submit" value="Wijzigen"/> </fieldset> </div> } This is my controller, which does nothing at the moment until i can get the full viewmodel back from the view. public ActionResult UpdateInschrijvingen(InschrijvingModel inschrijvingsModel) { // inschrijvingsModel is not null, but it creates a new model before it comes here with //Use the model for some updates return RedirectToAction("Inschrijven", new { vluchtId = inschrijvingsModel.vlucht.VluchtId }); } This is the model with the List and some other objects who become null because it creates a new model when it comes back from the view to the actionresult public class InschrijvingModel { public Vlucht vlucht; public Duivenmelker duivenmelker; public List<CheckBoxModel> inschrijvingLijst { get; set; } public InschrijvingModel() { // Without this i get, No parameterless constructor defined exception. // So it uses this when it comes back from the view to make a new model } public InschrijvingModel(Duivenmelker m, Vlucht vl) { inschrijvingLijst = new List<CheckBoxModel>(); vlucht = vl; duivenmelker = m; foreach (var i in m.Duiven) { inschrijvingLijst.Add(new CheckBoxModel(){Duif = i, isGeselecteerd = i.IsIngeschrevenOpVlucht(vl)}); } } What is going wrong and how should i fix this problem please? Thanks

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  • Good way to get the key of the highest value of a Dictionary in C#

    - by Arda Xi
    I'm trying to get the key of the maximum value in the Dictionary<double, string> results. This is what I have so far: double max = results.Max(kvp => kvp.Value); return results.Where(kvp => kvp.Value == max).Select(kvp => kvp.Key).First(); However, since this seems a little inefficient, I was wondering whether there was a better way to do this.

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  • Doctrine does not export relation properly

    - by iggnition
    Hi, I've got a MySQL 5.1.41 database which i'm trying to fill with doctrine, but doctrine does not insert the relations correctly. My YAML is: Locatie: connection: doctrine tableName: locatie columns: loc_id: type: integer(4) fixed: false unsigned: false primary: true autoincrement: true org_id: type: integer(4) fixed: false unsigned: false primary: false notnull: false autoincrement: false naam: type: string(30) fixed: false unsigned: false primary: false notnull: true autoincrement: false straat: type: string(30) fixed: false unsigned: false primary: false notnull: true autoincrement: false huisnummer: type: integer(4) fixed: false unsigned: false primary: false notnull: true autoincrement: false huisnummer_achtervoegsel: type: string(3) fixed: false unsigned: false primary: false notnull: false autoincrement: false plaats: type: string(25) fixed: false unsigned: false primary: false notnull: true autoincrement: false postcode: type: string(6) fixed: false unsigned: false primary: false notnull: true autoincrement: false telefoon: type: string(12) fixed: false unsigned: false primary: false notnull: true autoincrement: false opmerking: type: string() fixed: false unsigned: false primary: false notnull: false autoincrement: false inloggegevens: type: string() fixed: false unsigned: false primary: false notnull: false autoincrement: false relations: Organisatie: local: org_id foreign: org_id type: one onDelete: CASCADE onUpdate: CASCADE Organisatie: connection: doctrine tableName: organisatie columns: org_id: type: integer(4) fixed: false unsigned: false primary: true autoincrement: true naam: type: string(30) fixed: false unsigned: false primary: false notnull: true autoincrement: false straat: type: string(30) fixed: false unsigned: false primary: false notnull: true autoincrement: false huisnummer: type: integer(4) fixed: false unsigned: false primary: false notnull: true autoincrement: false huisnummer_achtervoegsel: type: string(3) fixed: false unsigned: false primary: false notnull: false autoincrement: false plaats: type: string(25) fixed: false unsigned: false primary: false notnull: true autoincrement: false postcode: type: string(6) fixed: false unsigned: false primary: false notnull: true autoincrement: false telefoon: type: string(12) fixed: false unsigned: false primary: false notnull: true autoincrement: false opmerking: type: string(255) fixed: false unsigned: false primary: false notnull: false autoincrement: false relations: Locatie: local: org_id foreign: org_id type: many Now if a make an organisation and then create a location which has a foreignkey to organisation everything is fine. but when i try to update the org_id with phpmyadmin i get a contraint error. If i manually set the foreign key to ON_UPDATE CASCADE it does work. Why does doctrine not set this option? I got it to work in Propel, but i really want to use doctrine for this.

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  • Challenge: Neater way of currying or partially applying C#4's string.Join

    - by Damian Powell
    Background I recently read that .NET 4's System.String class has a new overload of the Join method. This new overload takes a separator, and an IEnumerable<T> which allows arbitrary collections to be joined into a single string without the need to convert to an intermediate string array. Cool! That means I can now do this: var evenNums = Enumerable.Range(1, 100) .Where(i => i%2 == 0); var list = string.Join(",",evenNums); ...instead of this: var evenNums = Enumerable.Range(1, 100) .Where(i => i%2 == 0) .Select(i => i.ToString()) .ToArray(); var list = string.Join(",", evenNums); ...thus saving on a conversion of every item to a string, and then the allocation of an array. The Problem However, being a fan of the functional style of programming in general, and method chaining in C# in particular, I would prefer to be able to write something like this: var list = Enumerable.Range(1, 100) .Where(i => i%2 == 0) .string.Join(","); This is not legal C# though. The closest I've managed to get is this: var list = Enumerable.Range(1, 100) .Where(i => i%2 == 0) .ApplyTo( Functional.Curry<string, IEnumerable<object>, string> (string.Join)(",") ); ...using the following extension methods: public static class Functional { public static TRslt ApplyTo<TArg, TRslt>(this TArg arg, Func<TArg, TRslt> func) { return func(arg); } public static Func<T1, Func<T2, TResult>> Curry<T1, T2, TResult>(this Func<T1, T2, TResult> func) { Func<Func<T1, T2, TResult>, Func<T1, Func<T2, TResult>>> curried = f => x => y => f(x, y); return curried(func); } } This is quite verbose, requires explicit definition of the parameters and return type of the string.Join overload I want to use, and relies upon C#4's variance features because we are defining one of the arguments as IEnumerable rather than IEnumerable. The Challenge Can you find a neater way of achieving this using the method-chaining style of programming?

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  • Add Entities using EF

    - by kathy
    ![It would be great if someone can point me in the right direction on this topic I have the following admx: And I have to add the (AccData, CntactData, PhnNumber, FnclDetail)entities to the database in one shot What’s the best practices to do the add operation for the above entities?? ]1

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  • Core data many-to-many relationship - Predicate question

    - by Garry
    In my Core Data model I have two entities: List and Patient. List has an attribute called 'name'. A List can have any number of Patients and each Patient can belong to any number of different lists. I have therefore set a relationship on List called 'patients' that has an inverse to-many relationship to Patient AND a relationship on Patient called 'lists' that has a to-many relationship to List. What I'm struggling to figure out is how to create a Predicate that will select all Patients that belong to a particular List name. How would I go about this? I have never used relationships before in Core Data. Thanks,

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  • Inherit a parent class docstring as __doc__ attribute

    - by Reinout van Rees
    There is a question about Inherit docstrings in Python class inheritance, but the answers there deal with method docstrings. My question is how to inherit a docstring of a parent class as the __doc__ attribute. The usecase is that Django rest framework generates nice documentation in the html version of your API based on your view classes' docstrings. But when inheriting a base class (with a docstring) in a class without a docstring, the API doesn't show the docstring. It might very well be that sphinx and other tools do the right thing and handle the docstring inheritance for me, but django rest framework looks at the (empty) .__doc__ attribute. class ParentWithDocstring(object): """Parent docstring""" pass class SubClassWithoutDoctring(ParentWithDocstring): pass parent = ParentWithDocstring() print parent.__doc__ # Prints "Parent docstring". subclass = SubClassWithoutDoctring() print subclass.__doc__ # Prints "None" I've tried something like super(SubClassWithoutDocstring, self).__doc__, but that also only got me a None.

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  • The Project Location is Not Trusted error in Visual Studio

    - by SLC
    Quite a simple error, and the reason is obvious - I mapped a network drive, and I am opening the solution from it. Visual Studio gives me this error. I tried googling, and to my surprise, couldn't find a fix. I am running Visual Studio 2008. The solutions I found on google say I should run Mscorcfg.msc, but unfortunately, I don't seem to have that file anywhere on my computer. Nor do I seem to have anything in my control panel relating to .NET Framework. I can of course, run .NET applications fine, so the framework exists. Another solution suggested running caspol.exe, although this is .NET 2, which I also tried to no avail. Any ideas? I should add that I am trying to add the path to whatever trusted list there is.

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  • Why am I getting the extra xmlns="" using LinqToXML?

    - by Hcabnettek
    Hello all, I'm using LinqToXML to generate a piece of XML. Everything works great except I'm throwing in some empty namespace declarations somehow. Does anyone out there know what I'm doing incorrectly? Here is my code private string SerializeInventory(IEnumerable<InventoryInformation> inventory) { var zones = inventory.Select(c => new { c.ZoneId , c.ZoneName , c.Direction }).Distinct(); XNamespace ns = "http://www.dummy-tmdd-address"; XNamespace xsi = "http://www.w3.org/2001/XMLSchema-instance"; var xml = new XElement(ns + "InventoryList" , new XAttribute(XNamespace.Xmlns + "xsi", xsi) , zones.Select(station => new XElement("StationInventory" , new XElement("station-id", station.ZoneId) , new XElement("station-name", station.ZoneName) , new XElement("station-travel-direction", station.Direction) , new XElement("detector-list" , inventory.Where(p => p.ZoneId == station.ZoneId).Select(plaza => new XElement("detector" , new XElement("detector-id", plaza.PlazaId))))))); xml.Save(@"c:\tmpXml\myXmlDoc.xml"); return xml.ToString(); } And here is the resulting xml. I hope it renders correctly? The browser may hide the tags. - <InventoryList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.dummy-tmdd-address"> <StationInventory xmlns=""> <station-id>999</station-id> <station-name>Zone 999-SEB</station-name> <station-travel-direction>SEB</station-travel-direction> <detector-list> <detector> <detector-id>7503</detector-id> </detector> <detector> <detector-id>2705</detector-id> </detector> </detector-list> </StationInventory> </InventoryList> Notice the empty namespace declaration in the first child element. Any ideas how I can remedy this? Any tips are of course appreciated. Thanks All, ~ck

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  • Copied App.config to (Assembly).exe.config but from folder debug application doesn't run

    - by uugan
    Gives error: "The specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider, or not valid" App.config looks like and it's same as (Assembly.exe.config) config file for output: <?xml version="1.0" encoding="utf-8"?> <configuration> <connectionStrings> <add name="Entities1" connectionString="metadata=res://*/;provider=System.Data.SqlClient;provider connection string='data source=localhost;initial catalog=DatabaseName;integrated security=True;multipleactiveresultsets=True;App=EntityFramework'" providerName="System.Data.EntityClient" /> </connectionStrings> </configuration> How to run exe with it's configuration file? I tried to change '' to quot but nothing has changed.

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  • Loading XML from Web Service

    - by Lukasz
    I am connecting to a web service to get some data back out as xml. The connection works fine and it returns the xml data from the service. var remoteURL = EveApiUrl; var postData = string.Format("userID={0}&apikey={1}&characterID={2}", UserId, ApiKey, CharacterId); var request = (HttpWebRequest)WebRequest.Create(remoteURL); request.Method = "POST"; request.ContentLength = postData.Length; request.ContentType = "application/x-www-form-urlencoded"; // Setup a stream to write the HTTP "POST" data var WebEncoding = new ASCIIEncoding(); var byte1 = WebEncoding.GetBytes(postData); var newStream = request.GetRequestStream(); newStream.Write(byte1, 0, byte1.Length); newStream.Close(); var response = (HttpWebResponse)request.GetResponse(); var receiveStream = response.GetResponseStream(); var readStream = new StreamReader(receiveStream, Encoding.UTF8); var webdata = readStream.ReadToEnd(); Console.WriteLine(webdata); This prints out the xml that comes from the service. I can also save the xml as an xml file like so; TextWriter writer = new StreamWriter(@"C:\Projects\TrainingSkills.xml"); writer.WriteLine(webdata); writer.Close(); Now I can load the file as an XDocument to perform queries on it like this; var data = XDocument.Load(@"C:\Projects\TrainingSkills.xml"); What my problem is that I don't want to save the file and then load it back again. When I try to load directly from the stream I get an exception, Illegal characters in path. I don't know what is going on, if I can load the same xml as a text file why can't I load it as a stream. The xml is like this; <?xml version='1.0' encoding='UTF-8'?> <eveapi version="2"> <currentTime>2010-04-28 17:58:27</currentTime> <result> <currentTQTime offset="1">2010-04-28 17:58:28</currentTQTime> <trainingEndTime>2010-04-29 02:48:59</trainingEndTime> <trainingStartTime>2010-04-28 00:56:42</trainingStartTime> <trainingTypeID>3386</trainingTypeID> <trainingStartSP>8000</trainingStartSP> <trainingDestinationSP>45255</trainingDestinationSP> <trainingToLevel>4</trainingToLevel> <skillInTraining>1</skillInTraining> </result> <cachedUntil>2010-04-28 18:58:27</cachedUntil> </eveapi> Thanks for your help!

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  • It is okay to migrate to Asp.NET 4.0 now?

    - by Tarik
    Okay today, as most of you noticed Framework 4.0 has been released. I've been working on a project which is being built on framework 3.5. Since I want to use dynamic keyword and most of the asp.net features like Tableless Menu Control, ClientIDMode and clean web.config etc. I am kinda urging to migrate the unfinished project to 4.0 but I am little hesitating about that.Some times I think it is way better to wait for SP1. So what do you think about it? You guys will migrate to unfinished projects or will still hang out with 3.5 for a while. Thanks.

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  • Configuration Files: how to read them into models?

    - by stacker
    I have a lot of configuration files in this format: <?xml version="1.0" encoding="utf-8"?> <XConfiguration> <XFile Name="file name 1" /> <XFile Name="name2" /> <XFile Name="name3" /> <XFile Name="name4" /> </XConfiguration> I want to use ConfigurationRepository.Get to get this object populated: public class XConfiguration { public XFile[] Files { get; set; } } I wonder what is the best way to do that. LinqToXml? I don't think ConfigurationManager is a smart option for this.

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  • When I make a database change, how do I know what needs to be removed and readded to the LinqToSql O

    - by Michael Maddox
    For example, I alter a column in a table to be not null from null. I need to then delete and readd the table. That part is pretty clear. What about views, functions, and stored procedures that access the table, especially that column in the table? I've tried running diffs against the files generated by SQLMetal with some limited success, but even with that it's fairly unclear. I know there is at least one commercial tool out there that claims to address this problem, but I am looking for something free. How are people dealing with this issue?

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  • GAE modeling relationship options

    - by Sway
    Hi there, I need to model the following situation and I can't seem to find a consistent example on how to do it "correctly" for the google app engine. Suppose I've got a simple situation like the following: [Company] 1 ----- M [Stare] A company has one to many stores. Each store has an address made up of a address line 1, city, state, country, postcode etc. Ok. Lets say we need to create say an "Audit". An Audit is for a company and can be across one to many stares. So something like: [Audit] 1 ------ 1 [Company] 1 ------ M [Store] Now we need to query all of the "audits" based on the Store "addresses" in order to send the "Auditors" to the right locations. There seem to be numerous articles like this one: http://code.google.com/appengine/articles/modeling.html Which give examples of creating a "ContactCompany" model class. However they also say that you should use this kind of relationship only when you "really need to" and with "care" for performance. I've also read - frequently - that you should denormalize as much as possible thereby moving all of the "query-able" data into the Audit class. So what would you suggest as the best way to solve this? I've seen that there is an Expando class but I'm not sure if that is the "best" option for this. Any help or thoughts on this would be totally appreciated. Thanks in advance, Matt

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  • How to generate following xml

    - by Mohsan
    hi. i want to generate XML for the following tree type structure. i attached picture. generated xml should be <services> <service> <name>Service 1</name> <categories> <category> <name>Cateogry 1</name> <methods> <method> <name>Method 1</name> </method> </methods> </category> </categories> </service> <service> <name>Service 2</name> <categories> <category> <name>Cateogry 1</name> <methods> <method> <name>Method 1</name> </method> </methods> </category> </categories> </service> <service> <name>Service 3</name> <categories> <category> <name>Cateogry 1</name> <methods> <method> <name>Method 1</name> </method> </methods> </category> </categories> </service> </services>

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  • Returning Index in Enumerable Select

    - by Jon
    I have a List<MyClass> with 2 items which have a SequenceNumber property. If I use this code below the returned index is 0 not 1: var test = TrackingCollection .Where(x => x.SequenceNumber == 2) .Select((item, index) => new { index, item.SequenceNumber }); Is this because that refers to 0 as the index in my new anonymous type or is it some zero index based weirdness that I just need to increment. What I'm after is to return the index in TrackingCollection where the sequence number is 2 or 887 or any other correct index in the original collection...

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  • Problem with saving new elements in my xml at right level

    - by Fore
    I have a xml file that looks like this: <DataTalk> <Posts> <TalkPost> <PostType>dialog</PostType> <User>ABBE</User> <Customer>HRM - Heroma</Customer> <PostedDate>0001-01-01T00:00:00</PostedDate> <Message>TEST</Message> </TalkPost> </Posts> </DataTalk> When I now want to save new elements, I do: document.root.add((new XElement("TalkPost", new XElement("PostType", newDialog.PostType), new XElement("User", newDialog.User), new XElement("Customer", newDialog.Customer), new XElement("PostedDate", newDialog.PostDate), new XElement("Message", newDialog.Message))); The problem is now that it gets saved at the wrong hierarchal level. They all gets saved under <datatalk> and not under <posts> that I wan't to. How should I do to save the new elements under the <posts> hierarchically

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