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  • MVC pattern and State Machine

    - by topright
    I think of a game as a state machine. Game States separate I/O processing, game logic and rendering into different classes: while (game_loop) { game->state->io_events(this); game->state->logic(this); game->state->rendering(); } You can easily change a game state in this approach. MVC separation works in more complex way: while (game_loop) { game->cotroller->io_events(this); game->model->logic(this); game->view->rendering(); } So changing Game States becomes error prone task (switch 3 MVC objects, not 1). What are practical ways of combining these 2 concepts?

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  • ASP.Net MVC and N-Tier

    - by Damien
    Greetings, Apologies in advance that I have not researched this toughly enough to answer the question myself, but I imagine it would take me some time and I would rather know now before I invest more time in learning it. I couldn't find anything in my initial research.. Why use ASP.Net MVC if your already using a multi-tier architecture (Data Layer, Logic Layer, Presentation Layer)? Other than the fact the controller has more power than the logic layer. Am I right in thinking I can use nHibernate and all my data access classes, entities, and mappings in the Model part of the MVC? When using controllers, is it best to separate a lot of the logic into a separate class so I can call it from multiple controllers? Or can I call them from the controllers themselves, considering the fact that I would not want all of them to be Actions, just normal methods. Thanks

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  • Modern way to handle and validate POST-data in MVC 2

    - by zerkms
    There are a lot of articles devoted to working with data in MVC, and nothing about MVC 2. So my question is: what is the proper way to handle POST-query and validate it. Assume we have 2 actions. Both of them operates over the same entity, but each action has its own separated set of object properties that should be bound in automatic manner. For example: Action "A" should bind only "Name" property of object, taken from POST-request Action "B" should bind only "Date" property of object, taken from POST-request As far as I understand - we cannot use Bind attribute in this case. So - what are the best practices in MVC2 to handle POST-data and probably validate it. UPD: After Actions performed - additional logic will be applied to the objects so they become valid and ready to store in persistent layer. For action "A" - it will be setting up Date to current date.

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  • ASP.NET MVC as a service host for SOA like architecture

    - by Delucia
    I'm creating a distributed application that includes a lot of services and I'm looking for the technology that allows me to create and manage a lot of services easily. I know managing and deploying windows services is not fun. I'm thinking of using ASP.NET MVC as service host of my services where each controller action becomes essentially a service and I can communicate with a service via simple HTTP request and responses and not have to deal with complexity if i use something like WCF. Services need to be isolated and asp.net requests are isolated as far as i know, i.e. if a request throws an exception it will not effect other running requests. But I still have questions about the management of the services. How will it be possible to see which services are running, stopping and resuming services. Also ASP.NET MVC are passive, i.e. they only do something upon a request but what if i want to service that initiates work by itself?

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  • Validating only selected fields using ASP.NET MVC 2 and Data Annotations

    - by thinknow
    I'm using Data Annotations with ASP.NET MVC 2 as demonstrated in this post: http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx Everything works fine when creating / updating an entity where all required property values are specified in the form and valid. However, what if I only want to update some of the fields? For example, let's say I have an Account entity with 20 fields, but I only want to update Username and Password? ModelState.IsValid validates against all the properties, regardless of whether they are referenced in the submitted form. How can I get it to validate only the fields that are referenced in the form?

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  • Facebook canvas app ASP.NET MVC HttpException: Invalid Model

    - by zznq
    I am working on a Facebook tab application. I am using asp.net MVC 2 with the "official" Microsoft Facebook SDK. Most of my views are working just fine. However, I have one that is causing a huge mess. I am simply returning a List<Tags> to the view and as my ViewModel. This problematic view is simply displaying the list in a foreach loop. Whenever navigate to this view I get a "System.Web.HttpException: Invalid Model" exception. The most puzzling part of all this is that the same code is running without fail on our regular(non-Facebook) app that works just fine with the same code. Any insight into why Facebook and asp.net MVC 2 would be causing this behavior would be much appreciated.

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  • DataBinding a DropDownList in ASP.NET MVC 2

    - by Daniel Coffman
    I'm extremely frustrated trying to switch to MVC after a couple years of webforms development. Here's my extremely simple problem that I can't manage to solve: I have a list of States in a table called StateProvince. I have a DropDownList. I want the DropDownList to display all of the States in the StateProvince table and post the selected state back on HTTP PUT. This is what I'm doing: <%: Html.DropDownListFor(model = model.StateProvinceId, new SelectList(Model.StateProvinces, "StateProvinceId", "Name") )% I'm getting an Object reference not set to an instance of an object. Why? How can I make this work? Keep it simple, I know nothing about MVC.

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  • MVC 2 AntiForgeryToken - Why symmetric encryption + IPrinciple?

    - by Brad R
    We recently updated our solution to MVC 2, and this has updated the way that the AntiForgeryToken works. Unfortunately this does not fit with our AJAX framework any more. The problem is that MVC 2 now uses symmetric encryption to encode some properties about the user, including the user's Name property (from IPrincipal). We are able to securely register a new user using AJAX, after which subsequent AJAX calls will be invalid as the anti forgery token will change when the user has been granted a new principal. There are also other cases when this may happen, such as a user updating their name etc. My main question is why does MVC 2 even bother using symmetric encryption? Any then why does it care about the user name property on the principal? If my understanding is correct then any random shared secret will do. The basic principle is that the user will be sent a cookie with some specific data (HttpOnly!). This cookie is then required to match a form variable sent back with each request that may have side effects (POST's usually). Since this is only meant to protect from cross site attacks it is easy to craft up a response that would easily pass the test, but only if you had full access to the cookie. Since a cross site attacker is not going to have access to your user cookies you are protected. By using symmetric encryption, what is the advantage in checking the contents of the cookie? That is, if I already have sent an HttpOnly cookie the attacker cannot override it (unless a browser has a major security issue), so why do I then need to check it again? After having a think about it it appears to be one of those 'added layer of security' cases - but if your first line of defence has fallen (HttpOnly) then the attacker is going to get past the second layer anyway as they have full access to the users cookie collection, and could just impersonate them directly, instead of using an indirect XSS/CSRF attack. Of course I could be missing a major issue, but I haven't found it yet. If there are some obvious or subtle issues at play here then I would like to be aware of them.

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  • Using ViewModel Pattern with MVC 2 Strongly Typed HTML Helpers

    - by Brettski
    I am working with ASP.NET MVC2 RC and can't figure out how to get the HTML helper, TextBoxfor to work with a ViewModel pattern. When used on an edit page the data is not saved when UpdateModel() is called in the controller. I have taken the following code examples from the NerdDinner application. Edit.aspx <%@ Language="C#" Inherits="System.Web.Mvc.ViewUserControl<NerdDinner.Models.DinnerFormViewModel>" %> ... <p> // This works when saving in controller (MVC 1) <label for="Title">Dinner Title:</label> <%= Html.TextBox("Title", Model.Dinner.Title) %> <%= Html.ValidationMessage("Title", "*") %> </p> <p> // This does not work when saving in the controller (MVC 2) <label for="Title">Dinner Title:</label> <%= Html.TextBoxFor(model => model.Dinner.Title) %> <%= Html.ValidationMessageFor(model=> model.Dinner.Title) %> </p> DinnerController // POST: /Dinners/Edit/5 [HttpPost, Authorize] public ActionResult Edit(int id, FormCollection collection) { Dinner dinner = dinnerRepository.GetDinner(id); if (!dinner.IsHostedBy(User.Identity.Name)) return View("InvalidOwner"); try { UpdateModel(dinner); dinnerRepository.Save(); return RedirectToAction("Details", new { id=dinner.DinnerID }); } catch { ModelState.AddModelErrors(dinner.GetRuleViolations()); return View(new DinnerFormViewModel(dinner)); } } When the original helper style is used (Http.TextBox) the UpdateModel(dinner) call works as expected and the new values are saved. When the new (MVC2) helper style is used (Http.TextBoxFor) the UpdateModel(dinner) call does not update the values. Yes, the current values are loaded into the edit page on load. Is there something else which I need to add to the controller code for it to work? The new helper works fine if I am just using a model and not a ViewModel pattern. Thank you.

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  • ASP.NET MVC 2 relative paths for scripts and styles

    - by Tomaszewski
    Hi, having this really silly problem in ASP.NET MVC 2 with .NET 4. I need to test other pages using localhost, but sometimes I need to show the page to some else on another computer and so need to path out to my machine. In doing so, I need to use relative paths for my and tags. When I test through VS, I use relative path: <script src="../../Scripts/somejavascript.js"></script> <link href="../../Styles/somestyle.css" /> However, when I publish to local IIS, I'm having all sorts of problems beacuse the Scripts and Styles folder are at the same directory level, but it seems like I have to path out differently. For example, in the scenario above the styles will be picked up but the JavaScript won't be. Any ideas on how best to path out, relatively using MVC 2?

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  • XML Validation in ASP.NET MVC during load

    - by Jamie Nordmeyer
    I'm writing an ASP.NET MVC 2 application where one of the backing stores I plan to support is XML. I have a POCO that represents the settings for the site, along with an XML file to contain these settings. My question is what is the best way to validate this data as it is read from disk in to the POCO? I know I can use an XSD, or maybe use the Data Annotations library to mark up the POCO, and use reflection to validate the data, but is there another way, perhaps in .NET 3.5 or MVC to do this? I've spent some time Googling this issue, and want to be sure I'm doing it in the best manner. Thanks in advance!

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  • Adding Listeners at runtime? - Java MVC

    - by Halo
    My model in my MVC pattern, generates components at runtime and gives them to the View to be displayed on the screen through update() method (you know, model is the observable and the view is the observer). But I also need to add listeners to these components, and the controller has the listener methods (because they say the MVC pattern is like this) and it's not involved in this update process. So I can't add the listeners at runtime, but only in the controller's constructor at startup. I've got an idea, that is making the controller the observer and then giving the data to the view, as well as adding the listeners. Do you think this would be OK?

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  • How can I Convert XML to an Object using Spring 3.0 mvc while making RESTful request

    - by brock
    Hi, I'm using the Spring 3.0 RC1 framework and I'm currently testing out Spring mvc. I wanted to use Spring mvc to handle restful requests. I have set up my controller to handle the URI request. I am passing in xml with the request. So on the controller I have a method like follows: public void request(RequestObject request) { doSomething(); } I am having a hard time converting the xml to the RequestObject. I haven't seen much documentation on this and I was wondering if anyone could point me in the right direction. I'm guess that you would have to annotate the RequestObject using JAXB or something in order to tell Spring to convert the xml file to RequestObject but I'm not sure. Thanks for all of your help!!

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  • ASP.NET MVC project won't start under IIS 5.1 on Windows XP SP3

    - by mrjoltcola
    I've a ASP.NET MVC 2 project that runs fine under Windows 7 and will start on Windows XP if I use the Visual Studio Development Server, however, starting under IIS generates an error: Unable to start debugging on the web server With the message The specified procedure could not be found No errors in the system event viewer. If I start without debugging I get an "HTTP 500 Internal Server Error" The reason I run it under IIS is the project also includes some WCF wsHttp web services that use certificates, so the VS Development Server is not adequate for hosting those. I have already seen the links on SO that talk about adding the wildcard mapping. I've already done that, just as I've done on Windows Server 2003 where I successfully host ASP.NET MVC RC2 for quite a while.

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  • Is this part of MVC in .NET?

    - by 4thSpace
    I have a .NET MVC winform app. I've created an AppDelegate class that handles application startup and shutdown...for now (it might do more later). Winform apps have a Program.cs file that does some app initialization, starts the message pump and creates the first form. In my app, the first form is AppDelegate, which isn't really a form but is forced that way by Application.Run(). AppDelegate does any further app initialization and starts the first Controller, which then initializes any child controllers (these then create their views). I don't consider events occuring in Program.cs and AppDelegate as part of the MVC. Conceptually, what would these be called?

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  • Help with MVC controller: passing a string from view to controller

    - by 109221793
    Hi guys, I'm having trouble with one particular issue, I was hoping someone could help me out. I've completed the MVC Music Store tutorial, and now I'm trying to add some administrator functionality - practice as I will have to do this in an MVC application in my job. The application is using the aspnet membership api, and what I have done so far is created a view to list the users. What I want to be able to do, is click on the users name in order to change their password. To try and carry the username to the changeUserPassword controller (custom made). I registered a new route in the global.asax.cs file in order to display the username in the URL, which is working so far. UserList View <%: Html.RouteLink(user.UserName, "AdminPassword", new { controller="StoreManager", action="changeUserPassword", username = user.UserName }) %> Global.asax.cs routes.MapRoute( "AdminPassword", //Route name "{controller}/{action}/{username}", //URL with parameters new { controller = "StoreManager", action = "changeUserPassword", username = UrlParameter.Optional} ); So now the URL looks like this when I reach the changeUserPassword view: http://localhost:51236/StoreManager/changeUserPassword/Administrator Here is the GET changeUserPassword action: public ActionResult changeUserPassword(string username) { ViewData["username"] = username; return View(); } I wanted to store the username in ViewData as I would like to use it in the GET changeUserPassword for display purposes, and also as a hidden value in the form. This is in order to pass it through to enable me to reset the password. Having debugged through the code, it seems that 'username' is null. How can I get this to work so that the username carries over from the Html.RouteLink, to the changeUserPassword action? Any help would be appreciated :) Here is my complete code: UserList.aspx <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<System.Web.Security.MembershipUserCollection>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> UserList </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>UserList</h2> <table> <tr> <th>User Name</th> <th>Last Activity date</th> <th>Locked Out</th> </tr> <%foreach (MembershipUser user in Model){ %> <tr> <td><%: Html.RouteLink(user.UserName, "AdminPassword", new { controller="StoreManager", action="changeUserPassword", username = user.UserName }) %></td> <td><%: user.LastActivityDate %></td> <td><%: user.IsLockedOut %></td> </tr> <% }%> </table> </asp:Content> changeUserPassword.aspx <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<musicStoreMVC.ViewModels.ResetPasswordAdmin>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> changeUserPassword </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Change Password: <%: ViewData["username"] %></h2> <% using (Html.BeginForm()) {%> <%: Html.ValidationSummary(true) %> <fieldset> <legend>Fields</legend> <div class="editor-label"> <%: Html.Hidden("username",ViewData["username"]) %> <%: Html.LabelFor(model => model.password) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.password) %> <%: Html.ValidationMessageFor(model => model.password) %> </div> <div class="editor-label"> <%: Html.LabelFor(model => model.confirmPassword) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.confirmPassword) %> <%: Html.ValidationMessageFor(model => model.confirmPassword) %> </div> <p> <input type="submit" value="Create" /> </p> </fieldset> <% } %> <div> <%: Html.ActionLink("Back to List", "Index") %> </div> </asp:Content> My actions public ActionResult UserList() { var users = Membership.GetAllUsers(); return View(users); } public ActionResult changeUserPassword(string username) { ViewData["username"] = username; return View(); }

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  • MVC best practice

    - by Patrick
    I'm new to MVC (i'm using codeigniter) and was wondering where I should put a "cut_description" function. My model retrieves a list of events including their description. If the description is too long, I would need to cut it after the first n words, and add a "read more" link, so the view doesn't get too cluttered. What would be the best practice? a) add the logic to cut after n words to the model; b) add the logic to the controller; c) add it to the view? I think C would be the easier (I have to loop through results anyway), but I'm not sure this would comply with MVC. What do you think?

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  • How to merge VB.NET WEB Project with C#.NET MVC project

    - by Thushara Perera
    Hi All, I've got an existing asp.net project written in vb.net need to merge into C# ASP.NET MVC 1.0 application. I couldn't find a good article on this. I have successfully created a sample project and merge it. It works successfully. But when merge it into my real project it does not work. I've used C#.csproj project file and deleted VB project file. for the merging i could find a good article this link successful on sample project not with the real project. good one: http://www.packtpub.com/article/mixing-asp.net-webforms-and-asp.net-mvc how it is possible to merge VB Default.aspx, C# Default.aspx and VB Global.asax, C# Global.asax. Can I used VB.vbproj file insted of csproj Thanks Thushara Perera

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  • Why can't I publish MVC project

    - by Vnuk
    I'm having problems publishing my MVC project. When I do publish and upload everything to web server I get this: [InvalidOperationException: The view 'Index' or its master could not be found. The following locations were searched: ~/Views/Home/Index.aspx ~/Views/Home/Index.ascx ~/Views/Shared/Index.aspx ~/Views/Shared/Index.ascx] Weird thing is that Index.aspx exists in ~/Views/Home/, but IIS cannot find it there. If I copy entire project to web server and let asp.net compile it on the fly it works like a charm. My routing code: routes.MapRoute( _ "Default", _ "{controller}/{action}/{id}", _ New With {.controller = "Home", .action = "Index", .id = ""} _ ) routes.MapRoute("Root", "", New With {.controller = "Home", .action = "Index", .id =""}) I'm using IIS7 on Windows 2008 Web server. ASP.NET MVC 1.0, Visual Studio 2008. I've tried it local with IIS7 on Windows 7 - same error.

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  • Real winforms/wpf projects which use MVC, MVP, MVVM

    - by Belousov Pavel
    Hello everybody, I have looked some videos and read some articles about MVC, MVP, MVVM. I think, that I understood basic principles and differences. But it seems to me that samples in articles and videos are very easy. I think that it's easy to learn how to apply these patterns when you can look on some projects. So I'd like to look on real projects(Winforms/WPF), which use MVC, MVP or MVVM. Could you provide me links to sources of such projects? (If it is open source) It will be great if projects will have unit tests for Controller/Presenter/ViewModel, because it's one of my problem when I develop applications. Thanks in advance.

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