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• ASP.NET MVC <OutputCache> SqlDependency (CommandNotification?) with LINQ queries

  - by sinni800

  Hello, I use LINQ queries in my ASP.NET MVC application and want to use OutputCache in some of my Actions. I hear this should be possible with CommandNotifications. But those seem to only go for self-created SQLCommands, or am I wrong? Can I manually tell SQL server to send SQLDependency notifications if certain tables change? And if yes, how can I attach them to the OutputCache? Another side question: Can you do this with strongly types views too? Thank you in advance...

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• How to get a value of a textarea using markitup in ASP.NET MVC ?

  - by VJ

  I want to get the value of the text area that is basically the free Markitup rich text editor <textarea id="markItUp"></textarea> and store it in my variable so how can i do this in asp.net mvc. Also is there any way I can use the HtmlHelper to use the markitup editor, since I can easily do something like this - <%= Html.TextAreaFor((model => model.Description)) %> I want to just get the value in the markitup editor and store in my sql server db in a string variable. Also further I would like to get these text which I assume will be storing html tags and display or render it with the html tags...I know HttpUtility.HttpDecode() method but are there any more suggestions on this...Thanks.

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• How do I stop IIS7 from putting out its own 404 before my MVC app gets a chance to handle it?

  - by Gary McGill

  I have an ASP.NET MVC 2 application, which has an Application_Error event handler in global.asax. In this, I'm detecting the case where the Exception type is HttpException and the HTTP code is 404, and redirecting to my own 404-handling page. This works fine on my Cassini development server, but now I'm trying to move it over to my production server which has IIS7. When I request a non-existent URL, IIS7 is showing its own 404 page, and so far as I can tell, my Application_Error method is never called. How do I fix that?

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• C# ASPNET MVC - How do you use ModelState.IsValid in a jquery/ajax postback?

  - by JK

  From what I've seen ModelState.IsValid is only calculated by the MVC frame work on a full postback, is that true? I have a jquery postback like so: var url = "/path/to/controller/myaction"; var id = $("#Id").val(); var somedata = $("#somedata").val(); // repeated for every textbox $.post(url, { id: id, somedata: somedata }, function (data) { // etc }); And the controller action looks like: public JsonResult MyAction(MyModel modelInstance) { if (ModelState.IsValid) { // ... ModelState.IsValid is always true, even when there is invalid data } } But this does not seem to trigger ModelState.IsValid. For example if somedata is 5 characters long, but the DataAnnotation says [StringLength(3)] - in this case ModelStae.IsValid is still true, because it hasn't been triggered. Is there something special I need to do when making a jquery/ajax post instead of a full post? Thanks!

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• MVC: Model View Controller -- does the View call the Model?

  - by Gary Green

  I've been reading about MVC design for a while now and it seems officially the View calls objects and methods in the Model, builds and outputs a view. I think this is mainly wrong. The Controller should act and retrieve/update objects inside the Model, select an appropriate View and pass the information to it so it may display. Only crude and rudiementary PHP variables/simple if statements should appear inside the View. If the View gets the information it needs to display from the Model, surely there will be a lot of PHP inside the View -- completely violating the point of seperating presentation logic.

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• How can I send a GET request containing a colon, to an ASP.NET MVC2 controller?

  - by Cheeso

  This works fine: GET /mvc/Movies/TitleIncludes/Lara%20Croft When I submit a request that contains a colon, like this: GET /mvc/Movies/TitleIncludes/Lara%20Croft:%20Tomb ...it generates a 400 error. The error says ASP.NET detected invalid characters in the URL. If I try url-escaping, the request looks like this: GET /mvc/Movies/TitleIncludes/Lara%20Croft%3A%20Tomb ...and this also gives me a 400 error. If I replace the colon with a | : GET /mvc/Movies/TitleIncludes/Lara%20Croft|%20Tomb ..that was also rejeted as illegal, this time with a 500 error. The message: Illegal characters in path. URL-escaping that | results in the same error. I really, really don't want to use a querystring parameter. related: Sending URLs/paths to ASP.NET MVC controller actions

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• Why can I not install ASPNET MVC2 from the Web Platform Installer? (Error: "requires VS2008 SP1", bu

  - by Cheeso

  I went to http://www.asp.net/mvc/ to try to install ASP.NET MVC. I didn't know, but MVC is now at version 2. There's a nifty thing called the Microsoft "Web Platform Installer" (WPI) which basically is a small installer-driver tool that presents a menu of things I might want to install, to do web things on Windows. On the menu are things like ASPNET MVC2, but also Drupal, PHP, Joomla, and a bunch of other things. From http://www.asp.net/mvc/, when I click on the link that says "Install MVC", it resolves to http://go.microsoft.com/fwlink/?LinkID=185037, which then pops up the WPI. But Then! I get an error dialog that reads "Installing ASPNET MVC2 requires VS2008 SP1". But I know that I have VS2008 SP1. What gives?

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• ASP.NET or ASP.NET MVC or Silverlight or a mixture of all ?

  - by Elmex

  I want to start to implement a new web application from the scratch. I have 2 years experiences with ASP.NET. Now Microsoft offers ASP.NET MVC. I have read a little about the concepts behind, but I am not sure if I should use the classic ASP.NET variant or the new one. Perhaps it makes sense to mix it ? Or should I move to Silverlight ? What do you thing ? What are the advantages and disadvantages of all these variants ?

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• Can I pass data via JQUERY to ASP.NET MVC controller action and have a view rendered in new browser

  - by Simon Lomax

  Hi, Can anyone advise if its possible to pass data via JQUERY to an ASP.NET MVC controller action and have a view rendered in new browser tab based on the model data passed to the action method. My scenario is that I have a Jqgrid populated with product info on a page. The user would tick the items in the grid that they would like a label produced for. After they've made their slection they would click a button and I would like (if possible) to render a view of that contains a label for each selected item and have the view render in a new browser tab. All the code to allow the selections and post the relevant data back to the action method is all working fine and I know its easy to use the Jquery $(selector).load() command to populate an element on the current page with the HTML returned from the action. But is it possible to populate an element on a page in a new browser tab. If it is how would I go about it? Hope this make sense.

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• How to handle form submission ASP.NET MVC Back button?

  - by melaos

  Hi guys, i have a form which allows the user to key in the data and then submit. if everything works well on this action result, then i will redirect the user back to a thank you page. my problem right now is that when the user click on the back button, they will be able to go back to the form page and the inputs will still be there. and if the user just click on submit again, i will be getting some potential weird bugs. so in terms of asp.net mvc, what's the best way to handle users who click on the back button? thanks!

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• How to redirect to a controller action from a JsonResult method in asp.net mvc?

  - by Pandiya Chendur

  I am fetching records for a user based on his UserId as a JsonResult... public JsonResult GetClients(int currentPage, int pageSize) { if (Session["UserId"] != "") { var clients = clirep.FindAllClients().AsQueryable(); var count = clients.Count(); var results = new PagedList<ClientBO>(clients, currentPage - 1, pageSize); var genericResult = new { Count = count, Results = results }; return Json(genericResult); } else { //return RedirectToAction("Index","Home"); } } How to redirect to a controller action from a JsonResult method in asp.net mvc?Any suggestion...

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• Is it possible to implement X-HTTP-Method-Override in ASP.NET MVC?

  - by Greg Beech

  I'm implementing a prototype of a RESTful API using ASP.NET MVC and apart from the odd bug here and there I've achieve all the requirements I set out at the start, apart from callers being able to use the X-HTTP-Method-Override custom header to override the HTTP method. What I'd like is that the following request... GET /someresource/123 HTTP/1.1 X-HTTP-Method-Override: DELETE ...would be dispatched to my controller method that implements the DELETE functionality rather than the GET functionality for that action (assuming that there are multiple methods implementing the action, and that they are marked with different [AcceptVerbs] attributes). So, given the following two methods, I would like the above request to be dispatched to the second one: [ActionName("someresource")] [AcceptVerbs(HttpVerbs.Get)] public ActionResult GetSomeResource(int id) { /* ... */ } [ActionName("someresource")] [AcceptVerbs(HttpVerbs.Delete)] public ActionResult DeleteSomeResource(int id) { /* ... */ } Does anybody know if this is possible? And how much work would it be to do so...?

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• How can I enable Pascal casing by default when using Jackson JSON in Spring MVC?

  - by bhilstrom

  I have a project that uses Spring MVC to create and handle multiple REST endpoints. I'm currently working on using Jackson to automatically handle the seralization/deserialization of JSON using the @RequestBody and @ResponseBody annotations. I have gotten Jackson working, so I've got a starting point. My problem is that our old serialization was done manually and used Pascal casing instead of Camel casing ("MyVariable" instead of "myVariable"), and Jackson does Camel casing by default. I know that I can manually change the name for a variable using @JsonProperty. That being said, I do not consider adding "@JsonProperty" to all of my variables to be a viable long-term solution. Is there a way to make Jackson use Pascal casing when serializing and deserializing other than using the @JsonProperty annotation?

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• ASP/NET MVC: Test Controllers w/Sessions? Mocking?

  - by Codewerks

  I read some of the answers on here re: testing views and controllers, and mocking, but I still can't figure out how to test an ASP.NET MVC controller that reads and sets Session values (or any other context based variables.) How do I provide a (Session) context for my test methods? Is mocking the answer? Anybody have examples? Basically, I'd like to fake a session before I call the controller method and have the controller use that session. Any ideas?

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• Problem with importing an mdf created with SQL EXPRESS 2008 into SQL SERVER 2005 [an ASP.NET MVC pro

  - by user252160

  the question is probably extremely easy to resolve, but I need to resolve it because I need to carry on with my project. I am using SQLEXPRESS 2008 at home, and I've been working on an ASP.NET MVC app that stores my DB in an mdf file in the project's folder. The problem is that the SQL Server in the Uni labs is SQL SERVER 2005, and when I try to open the mdf file with the VS Server Explorer,It says that the version of the mdf file is more than the server can accept. The only oprion that comes to my mind is exporting the DB as an sql file, just like I've done it thousand times with phpmyadmin. the thing is that the SQL MANAGEMENT STUDIO EXPRESS is not the most usable tool in the world, and for some strange reason all the articles I could find in Google were irrelevant. Please, help.

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• How to add request validation errors to ModelStateDictionary in ASP.NET MVC?

  - by Morten Christiansen

  Investigating the security of a system I'm building with ASP.NET MVC 2 led me to discover the request validation feature of ASP.NET - a very neat feature, indeed. But obviously I don't just want to present the users with the Yellow Screen of Death when they enter data with HTML in, so I'm out to find a better solution. My idea is to find all the fields that have invalid data and add them to the ModelStateDictionary before invoking the action such that they automatically appear in the UI as error messages. After googling this a bit it appears that no one have implemented this before which I find puzzling since it seems so obvious. Does anyone here have a suggestion on how to do this? My own idea is to supply a custom ControllerActionInvoker to the controller, as described here, that somehow checks for this and modifies the ModelStateDictionary but I'm stuck on how to do this last bit. Just catching HttpRequestValidationException exceptions does not seem a useful approach since it does not actually contain all the information I need.

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• Why can I not register a PropertyEditor for String in Spring MVC?

  - by Tom Tucker

  I'm using Spring 3.0.3. I've enabled the default ConversionService by adding this line to my Spring configuration XML. <mvc:annotation-driven/> I'm also using custom PropertyEditor's for certain data types, so I've registered them for corresponding data types like the following and they work fine. webDataBinder.registerCustomEditor(Date.class, new MyPropertyEditor()); I have a custom tag library that extends Spring's Form tag library, and I can acess these PropertyEditor's through getPropertyEditor() of AbstractDataBoundFormElementTag. What I don't understand is that I can't register a custom PropertyEditor for String for some reason. The following wouldn't work. webDataBinder.registerCustomEditor(String.class, new MyPropertyEditor()); When I do getPropertyEditor(), it always returns a ConvertingPropertyEditorAdapter, instead of MyPropertyEditor. Is this a bug? EDIT: I realized that I didn't do some stuff right. Spring works just fine.

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• Should I replace string patterns in asp.net mvc using a custom viewengine?

  - by Roger Rogers

  Have an ASP.NET MVC site that is localized. The localization functionality adds the two digit language ID to the URL, e.g. /es/Page. If no language Id is found in the URL, the site switches to the user's browser culture. All's good. However, the site's hyperlinks, a mixture of hard-coded href tags, actionlinks, etc., don't include the base language ID, so when clicking through the site the set culture is lost, and the site reverts to the user's browser culture. My (lazy) thought is to replace all href values, that don't point to an external site, with the localized URL (e.g. include the /es/). Otherwise, all site links will need to be updated to include the culture code. Is this just plain dumb? Or, reasonable, and should be done using a custom view engine, or some other approach?

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• What am i doing wrong with asp.net-mvc dropdownlist?

  - by Pandiya Chendur

  I use a dropdownlist in one of my create.aspx but it some how doesnt seem to work... public IEnumerable<SelectListItem> FindAllMeasurements() { var mesurements = from mt in db.MeasurementTypes select new SelectListItem { Value = mt.Id.ToString(), Text= mt.Name }; return mesurements; } and my controller, public ActionResult Create() { var mesurementTypes = consRepository.FindAllMeasurements().AsEnumerable(); ViewData["MeasurementType"] = new SelectList(mesurementTypes,"Id","Name"); return View(); } and my create.aspx has this, <p> <label for="MeasurementTypeId">MeasurementType:</label> <%= Html.DropDownList("MeasurementType")%> <%= Html.ValidationMessage("MeasurementTypeId", "*") %> </p> When i execute this i got these errors, DataBinding: 'System.Web.Mvc.SelectListItem' does not contain a property with the name 'Id'.

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• How do I dynamically tell a .NET MVC application which datasource to point to?

  - by Bialecki

  I'm beginning a port of an existing ColdFusion application to .NET MVC and one of the first issues I'm running into is that in ColdFusion we use the fact that you can define multiple datasources and access them in a dynamic way so that a particular user can be pointed at a particular database. To give an example, I might have two databases, Foo and Bar which each have a table called Locations which store locations particular to that database. The databases are guaranteed to have the same tables, so that's not a concern. In ColdFusion, you can easily dynamically point a user towards a particular datasource because it's just a string which is configured via the ColdFusion administrator (or you could programatically modify an XML file). So the question is how to do this in .NET? And specifically, I think I'd really like to use the Entity framework to leverage the ORM support it'll offer to perform operations on the data in the database, but I'm not sure how to do that (hopefully it's possible). Any thoughts?

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• Where does form processing logic belong in a MVC web application?

  - by AdamTheHutt

  In a web-based application that uses the Model-View-Controller design pattern, the logic relating to processing form submissions seems to belong somewhere in between the Model layer and the Controller layer. This is especially true in the case of a complex form (i.e. where form processing goes well beyond simple CRUD operations). What's the best way to conceptualize this? Are forms simply a kind of glue between models and controllers? Or does form logic belong squarely in the M or C camp? EDIT: I understand the basic flow of information in an MVC application (see chills42's answer for a summary). My question is where the form processing logic belongs - in the controller, in the model, or somewhere else?

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• Providing localized error messages for non-attributed model validation in ASP.Net MVC 2?

  - by Lance McNearney

  I'm using the DataAnnotations attributes along with ASP.Net MVC 2 to provide model validation for my ViewModels: public class ExamplePersonViewModel { [Required(ErrorMessageResourceName = "Required", ErrorMessageResourceType = typeof(Resources.Validation))] [StringLength(128, ErrorMessageResourceName = "StringLength", ErrorMessageResourceType = typeof(Resources.Validation))] [DataType(DataType.Text)] public string Name { get; set; } [Required(ErrorMessageResourceName = "Required", ErrorMessageResourceType = typeof(Resources.Validation))] [DataType(DataType.Text)] public int Age { get; set; } } This seems to work as expected (although it's very verbose). The problem I have is that there are behind-the-scenes model validations being performed that are not tied to any specific attribute. An example of this in the above model is that the Age property needs to be an int. If you try to enter a non-integer value on the form, it will error with the following (non-localized) message: The field Age must be a number. How can these non-attribute validation messages be localized? Is there a full list of these messages available so I can make sure they are all localized?

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• Does the traditional use of the controller in MVC lead to a violation of the Single Responsibility P

  - by Byron Sommardahl

  Wikipedia describes the Single Responsibility Principle this way: The Single Responsibility Principle states that every object should have a single responsibility, and that responsibility should be entirely encapsulated by the class. All its services should be narrowly aligned with that responsibility. The traditional use of the controller in MVC seems to lead a programmer towards a violation of this principle. Take a simple guest book controller and view. The controller might have two methods/actions: 1) Index() and 2) Submit(). The Index() displays the form. The Submit() processes it. Do these two methods represent two distinct responsibilities? If so, how does Single Responsibility come in to play?

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• How do I get all values from a listbox that are not selected in ASP.NET MVC

  - by Nick Reeve

  Hello, I have a form that (amongst other things) contains 2 multi-select listboxes. Basically you can add items to the one on the right from the full list of items on the left using some add/remove buttons. The problem is that I cannot see a way of picking up the contents of the listbox when posting back to the controller. I have followed this example: http://ittecture.wordpress.com/2009/04/30/tip-of-the-day-198-asp-net-mvc-listbox-controls/ This works fine if you have actually selected the items in the listbox before posting. That's not really the way I think this UI should behave though. Hope that makes sense, Nick

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• Seemingly normal link does not work in MVC, IIS5, SparkView.

  - by Matt W

  I have a regular link being generated in MVC1.0 as: /Login/Logout This link does not work. The code for it is: <a href="${Links.Logout}" class="SignOut">Sign out</a> As I am using SparkView. I am using IIS5.1 on WinXP Pro. I cannot work out why the link on the page calls the MVC action if I open the link in a separate browser tab but not when I click directly on it in the original page. This feels like a browser bug (Chrome, Firefox, IE8) but they all perform the same way. Thanks, Matt.

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