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  • How to use Dependency Injection with ASP.NET

    - by Schneider
    I am trying to work out a way to use Dependency Injection with ASP.NET controls. I have got lots of controls that create repositories directly, and use those to access and bind to data etc. I am looking for a pattern where I can pass repositories to the controls externally (IoC), so my controls remain unaware of how repositories are constructed and where they come from etc. I would prefer not to have a dependency on the IoC container from my controls, therefore I just want to be able to construct the controls with constructor or property injection. (And just to complicate things, these controls are being constructed and placed on the page by a CMS at runtime!) Any thoughts?

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  • Which management tools would you recommend for software development?

    - by Robert Schneider
    What would you generally recommend for software developement? Which combination do you use or would you recommend? I assume that tools are needed for Version control, issues/bugs/task, Release management, Requirement management. Tools for Test management and Project management should be accounted for as well, I guess. Did I forget anything? Maybe tools for Continous Integration. I'm not interested in a halfway combination of one ore two tools like a Subversion + Bugzilla (I know they are good but for a company they might not be sufficient). And also tools like make/ant shouldn't be taken into account. I'd like to know a combination that covers all what is important for professional software development. However, it could be a single tool of course if it covers all the management issues. What do you think would be a good combination? I assume a combination should be regardes as good if the tools itself are good but also if they have good integrations. Udate: Something like Ant is just a script not a management tool. Okay: we do already have Perforce. But this is somehow generic. We have different projects that uses C-, VS/.NET-, Python-, PHP and we will be starting new projects in Java. Plenty of languages and frameworks, though some are going to be legacy. So the tools should be generic. Obviously we don't want to use Bugzilla for one project and Jira for another. The management tools have to be generic. Further thoughts: Think of sourceforge: For each project they offer a version control system, an issue tracker, a wiki, ... totally independent of what the project is about. Those are some management tools that a project usually needs. I would say that most companies need such a set of tools. But I could imagine, if a company has several projects, they need further tools too: for Project management, Quality management, ... And I could imagine there are some recommendable combinations of tools. A not really apropiate comparison to this could be LAMP (Linux, Apache, MySQL, PHP). A combination of software that has evolved since they work very well together, and are pretty useful for a lot of applications (or rather web sites). So maybe there are some recommendable management tool combinations that also fit toghether like LAMP. The integration is important. Thank you for the incredibly fast and helpful responses!!!

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  • Implementing a Property Inspector/Editor in WPF

    - by Schneider
    So far my plan is to have an event "Item selected" which the property inspector listens to. The actual property inspector is just a ContentControl. When the object is selected the content property is set and the appropriate DataTemplate for editing the object is loaded. In general I am trying to do this "MVVM" style. I guess you could use reflection instead of templating but I only have a handful of types so far. Has anyone implemented something similar? Can you offer any advice or source code?

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  • Assembly reference from ASP.NET App_Code directory

    - by Gerald Schneider
    I have trouble getting a custom ObjectDataSource for an asp:ListView control to work. I have the class for the DataSource in the App_Code directory of the web application (as required by the asp:ListView control). using System; using System.Collections.Generic; using System.ComponentModel; using System.Configuration; using System.Data; using System.Data.Common; using System.Web; using System.DirectoryServices; [DataObject] public class UsersDAL { [DataObjectMethod(DataObjectMethodType.Select)] public List<User> LoadAll(int startIndex, int maxRows, string sortedBy) { List<User> users = new List<User>(); DirectoryEntry entry; return users; } } As soon as I add using System.DirectoryServices; the page crashes with this message: Compiler Error Message: CS0234: The type or namespace name 'DirectoryServices' does not exist in the namespace 'System' (are you missing an assembly reference?) Without the usage of System.DirectoryServices the page loads without problems. The reference is there, it is working in classes outside the App_Code directory.

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  • Modelling problem - Networked devices with commands

    - by Schneider
    I encountered a head scratching modelling problem today: We are modelling a physical control system composed of Devices and NetworkDevices. Any example of a Device is a TV. An example of a NetworkDevice is an IR transceiver with Ethernet connection. As you can see, to be able to control the TV over the internet we must connect the Device to the NetworkDevice. There is a one to many relationship between Device and NetworkDevice i.e. TV only has one NetworkDevice (the IR transceiver), but the IR transceiver may control many Devices (e.g. many TVs). So far no problem. The complicated bit is that every Device has a collection of Commands. The type of the Command (e.g IrCommand, SerialCommand - N.B. not currently modelled) depends on the type of NetworkDevice that the Device is connected to. In the current legacy system the Device has a collection of generic Commands (no typing) where fields are "interpreted" depending on the NetworkDevice type. How do I go about modelling this in OOP such that: You can only ever add a Command of the appropriate type, given the NetworkDevice the Device is attached to? If I change the NetworkDevice the Commands collection changes to the appropriate type Make it so the API is simple/elegant/intuitive to use

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  • Bi-directional view model syncing with "live" collections and properties (MVVM)

    - by Schneider
    I am getting my knickers in a twist recently about View Models (VM). Just like this guy I have come to the conclusion that the collections I need to expose on my VM typically contain a different type to the collections exposed on my business objects. Hence there must be a bi-directional mapping or transformation between these two types. (Just to complicate things, on my project this data is "Live" such that as soon as you change a property it gets transmitted to other computers) I can just about cope with that concept, using a framework like Truss, although I suspect there will be a nasty surprise somewhere within. Not only must objects be transformed but a synchronization between these two collections is required. (Just to complicate things I can think of cases where the VM collection might be a subset or union of business object collections, not simply a 1:1 synchronization). I can see how to do a one-way "live" sync, using a replicating ObservableCollection or something like CLINQ. The problem then becomes: What is the best way to create/delete items? Bi-directinal sync does not seem to be on the cards - I have found no such examples, and the only class that supports anything remotely like that is the ListCollectionView. Would bi-directional sync even be a sensible way to add back into the business object collection? All the samples I have seen never seem to tackle anything this "complex". So my question is: How do you solve this? Is there some technique to update the model collections from the VM? What is the best general approach to this?

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  • Compilers behave differently with a null parameter of a generic method

    - by Eyal Schneider
    The following code compiles perfectly with Eclipse, but fails to compile with javac: public class HowBizarre { public static <P extends Number, T extends P> void doIt(P value) { } public static void main(String[] args) { doIt(null); } } I simplified the code, so T is not used at all now. Still, I don't see a reason for the error. For some reason javac decides that T stands for Object, and then complains that Object does not conform to the bounds of T (which is true): HowBizarre.java:6: incompatible types; inferred type argument(s) java.lang.Number,java.lang.Object do not conform to bounds of type variable (s) P,T found : <P,T>void required: void doIt(null); ^ Note that if I replace the null parameter with a non-null value, it compiles fine. Which of the compilers behaves correctly and why? Is this a bug of one of them?

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  • Reordering methods in ComImport interfaces throws COMException (0x80041001)

    - by Ohad Schneider
    Consider the following code for COM interop with internet shortcuts: [ComImport] [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] [Guid("CABB0DA0-DA57-11CF-9974-0020AFD79762")] public interface IUniformResourceLocatorW { void SetUrl([MarshalAs(UnmanagedType.LPWStr)] string pcszUrl, int dwInFlags); void GetUrl([MarshalAs(UnmanagedType.LPWStr)] out StringBuilder ppszUrl); void InvokeCommand(IntPtr purlici); } [ComImport] [Guid("FBF23B40-E3F0-101B-8488-00AA003E56F8")] public class InternetShortcut { } The following works as expected: var ishort = new InternetShortcut(); ((IPersistFile)ishort).Load("MyLink.url", 0); ((IUniformResourceLocatorW)ishort).GetUrl(out url); However: If I comment out IUniformResourceLocatorW.SetUrl (which I am not using), IUniformResourceLocatorW.GetUrl throws a COMException (HResult 0x80041001). If I switch between IUniformResourceLocatorW.SetUrl and IUniformResourceLocatorW.GetUrl (that is place the former below the latter) the same exception is thrown If I comment out IUniformResourceLocatorW.InvokeCommand the code runs fine. It's as if the order has to be preserved "up to" the invoked method. Is this behavior by design? documented somewhere? I'm asking because some COM interfaces are composed of many methods with possibly many supporting types and I'd rather avoid defining what I don't need if possible.

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  • Possible to use Tables of same type in Linq to SQL?

    - by Schneider
    Lets say I've got an object model, where I have many collections of the same type. For example something like class StockMarketData { List<SummaryData> WeeklySummary; List<SummaryData> MonthlySummary; } class SummaryData { DateTime DateTime {get; set;} double Value {get; set;} } Those lists will map onto database tables. If you actually use L2S to generate a model from the database you will get something like: class StockMarketData { List<WeeklySummaryData> WeeklySummary; List<MonthlySummaryData> MonthlySummary; } Even though WeeklySummaryData and MonthlySummaryData have the same shape. Is it possible for Linq to SQL to create tables from a database of summary data, but get each table to contain the same type (such as shown in the top example).

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  • Set Hudson build number from a script

    - by Joe Schneider
    Is there a way to set the next build number in Hudson from a script? I have the nextBuildNumber plug-in installed, and attempted to use wget with --post-data, but that page appears to require login. I have two steps of a chained build and I want to keep the build numbers in sync.

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  • How to check WCF generated client is compatible with service at runtime

    - by Schneider
    I realise that WCF and services in general are meant to be loosely coupled. But I have a requirement that my client app can check whether an given WCF endpoint contains a service that matches its generated client code. In other words I need to check for a compatible service. Obviously I could have a method that returns a manually maintained version number, but I would prefer not to have to write my own meta data system if WCF can do something out of the box.

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  • Why aren't variables declared in "try" in scope in "catch" or "finally"?

    - by Jon Schneider
    In C# and in Java (and possibly other languages as well), variables declared in a "try" block are not in scope in the corresponding "catch" or "finally" blocks. For example, the following code does not compile: try { String s = "test"; // (more code...) } catch { Console.Out.WriteLine(s); //Java fans: think "System.out.println" here instead } In this code, a compile-time error occurs on the reference to s in the catch block, because s is only in scope in the try block. (In Java, the compile error is "s cannot be resolved"; in C#, it's "The name 's' does not exist in the current context".) The general solution to this issue seems to be to instead declare variables just before the try block, instead of within the try block: String s; try { s = "test"; // (more code...) } catch { Console.Out.WriteLine(s); //Java fans: think "System.out.println" here instead } However, at least to me, (1) this feels like a clunky solution, and (2) it results in the variables having a larger scope than the programmer intended (the entire remainder of the method, instead of only in the context of the try-catch-finally). My question is, what were/are the rationale(s) behind this language design decision (in Java, in C#, and/or in any other applicable languages)?

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  • Javascript document.open asynchronous?

    - by Alex Schneider
    So on my site there is a Javascript function that will load a new site from the server via XMLHttpRequest. After that it replaces the current page with the new one: var post = new XMLHttpRequest(); post.open('POST', data); post.onload = function() { var do = document.open("text/html", "replace"); do.write(post.responseText); do.close(); goOn(); } function goOn() { console.log($('img:visible')); } Some could assume that after do.close() the document has changed and is ready. But it is not, e.g. if i load very much/big data/responseText the function goOn() only logs an empty result. Obviously goOn() gets in that case called before the DOM is ready to be read! Unfortunately the is no "ready" event fired after write() finished.... How can i be sure it is finished? /EDIT: goOn() logs this to Chrome Console: [prevObject: p.fn.p.init[1], context: #document, selector: "img:visible"] context: #document length: 0 prevObject: p.fn.p.init[1] selector: "img:visible" __proto__: Object[0] But if i right after that type $('img:visible') into console manually it shows me all images....

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  • What is the right way to pass class parameters to a method

    - by Schneider
    Let's suppose I have three classes A, B and C public class A { public int A1; public string A2; } public class B { public char B1; public double B2; public decimal B3; } public class C { public string DoSomething(A a, B b) { var a1 = a.A1; var b2 = b.B2; var b3 = b.B3; // DoSomething return string.Empty; } } If DoSomething() is using just some fields of the A and B classes, do you prefer to pass the whole object in parameters or create an intermediate class that has just the needed fields by the DoSomething method ?

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  • Possible to use Bindings only for the SourceChanged event?

    - by Schneider
    Basically I want to use the WPF Binding framework to "observe" a property in the data context, and when that value changes to call an event handler. I do not actually want to bind it to any target. Sounds simple but from what I can see Binding is too coupled (to the visual tree and various other bits) to be able to use it flexibly. Any thoughts?

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  • Elegant way to debug n-tier from Visual Studio

    - by Schneider
    Just wondering if there is any easy way to start a debugging session that lauches the server and the client by simply pressing F5. As it stands I have to F5 to debug the server, then find the client project and right click-Debug, which is a bit fiddly. Any tips to get this to work more smoothly?

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  • Java Spotlight Episode 138: Paul Perrone on Life Saving Embedded Java

    - by Roger Brinkley
    Interview with Paul Perrone, founder and CEO of Perrone Robotics, on using Java Embedded to test autonomous vehicle operations for the Insurance Institute for Highway Safety that will save lives. Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link: Java Spotlight Podcast in iTunes. Show Notes News JDK 8 is Feature Complete Java SE 7 Update 25 Released What should the JCP be doing? 2013 Duke's Choice Award Nominations Another Quick update to Code Signing Article on OTN Events June 24, Austin JUG, Austin, TX June 25, Virtual Developer Day - Java, EMEA, 10AM CEST Jul 16-19, Uberconf, Denver, USA Jul 22-24, JavaOne Shanghai, China Jul 29-31, JVM Summit Language, Santa Clara Sep 11-12, JavaZone, Oslo, Norway Sep 19-20, Strange Loop, St. Louis Sep 22-26 JavaOne San Francisco 2013, USA Feature Interview Paul J. Perrone is founder/CEO of Perrone Robotics. Paul architected the Java-based general-purpose robotics and automation software platform known as “MAX”. Paul has overseen MAX’s application to rapidly field self-driving robotic cars, unmanned air vehicles, factory and road-side automation applications, and a wide range of advanced robots and automaton applications. He fielded a self-driving autonomous robotic dune buggy in the historic 2005 Grand Challenge race across the Mojave desert and a self-driving autonomous car in the 2007 Urban Challenge through a city landscape. His work has been featured in numerous televised and print media including the Discovery Channel, a theatrical documentary, scientific journals, trade magazines, and international press. Since 2008, Paul has also been working as the chief software engineer, CTO, and roboticist automating rock star Neil Young’s LincVolt, a 1959 Lincoln Continental retro-fitted as a fully autonomous extended range electric vehicle. Paul has been an engineer, author of books and articles on Java, frequent speaker on Java, and entrepreneur in the robotics and software space for over 20 years. He is a member of the Java Champions program, recipient of three Duke Awards including a Gold Duke and Lifetime Achievement Award, has showcased Java-based robots at five JavaOne keynotes, and is a frequent JavaOne speaker and show floor participant. He holds a B.S.E.E. from Rutgers University and an M.S.E.E. from the University of Virginia. What’s Cool Shenandoah: A pauseless GC for OpenJDK

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  • European Companies Can Now Subscribe to Oracle CRM on Demand Locally

    - by divya.malik
    Here is some important news that was announced by our colleagues in Oracle EMEA last week. Joining our other data centers in Austin, Colorado Springs and Sydney-Australia, Oracle announced a new data center in Europe. Oracle CRM On Demand customers can now have their content securely hosted locally in the region. Here is the press release, and to learn more about Oracle's CRM On Demand offering click here.

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