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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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• 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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• 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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• 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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• 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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• 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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• Resize Ext.form.ComboBox to fit its content

  - by ITRushn

  There are quite few solutions on Ext forums, but I wasn’t able to get any of them work. It seems I am missing something minor. I need to resize combobox to fit its content when it’s first created. I do not need to worry about resizing it when content is changing. Is there any working examples using Extjs 3.2? Current Code: var store = new Ext.data.ArrayStore({ fields: ['view', 'value', 'defaultselect'], data: Ext.configdata.dataCP }); comboCPU = new Ext.form.ComboBox({ tpl: '<tpl for="."><div class="x-combo-list-item"><b>{view}</b><br /></div></tpl>', store: store, displayField: 'view', width: 600, typeAhead: true, forceSelection: true, mode: 'local', triggerAction: 'all', editable: false, emptyText: 'empty text', selectOnFocus: true, listeners: { select: AdjustPrice, change: AdjustPrice, beforeselect: function (combo, record, index) { return ('false' == record.data.disabled); } }, applyTo: 'confelement' }); I've also tried removing width: 600 and replacing it with minListWidth: 600 but that result following and didnt fix the issue.

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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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• How to handle request-wise DB transactions in ASP.NET MVC?

  - by Dario Solera

  I'm using SubSonic 3.0 (SimpleRepository) to handle database access in my ASP.NET MVC 1.0 application. It would be nice to handle a transaction for every web request, committing if everything went smooth and rolling back in case of exception. Is this possible? If so, how? I know this topic has been discussed many times, but I just couldn't find a satisfactory answer. I have built my own solution (create a TransactionScope in the controller, then commit/rollback in OnActionExecuted), but it turns out to be very unreliable.

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• How can I perform action from ASP.NET MVC with different user credentials?

  - by Rob

  Hopefully this explanation will make sense, but what is the best way (if it is even possible) to pass along user credentials to preform a specific application from an ASP.NET MVC application. Currently I am working on trying to create directories on another server, we can't do this using the generic credentials that the application is running with; however, we have been told that we can if we pass the credentials of the user currently using the application along. Currently we are running on IIS 6.0 but will be moving to IIS 7.0 in the near future and likewise we are using Integrated Windows authentication for the web applications.

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• Spring MVC; avoiding file extension in url?

  - by Ezombort

  I just started with Spring Web MVC. I'm trying to avoid file extenstions in the url. How can i do this? (I'm using Spring 2.5.x) Bean: <bean name="/hello.htm" class="springapp.web.HelloController"/> I want it to be: <bean name="/hello" class="springapp.web.HelloController"/> I cannot get it to work. Any ideas? Edit: Url-mapping <servlet-mapping> <servlet-name>springapp</servlet-name> <url-pattern>*.htm</url-pattern> </servlet-mapping> I have tried changing the url-pattern with no luck (* and /*).

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• ASP.NET MVC: Is it good to access HttpContext in a controller?

  - by Zach

  I've been working with ASP.NET(WebForm) for a while, but new to ASP.NET MVC. From many articles I've read, in most cases the reason that the controllers are hard to test is because they are accessing the runtime components: HttpContext (including Request, Response ...). Accessing HttpContext in a controller seems bad. However, I must access these components somewhere, reading input from Request, sending results back via Response, and using Session to hold a few state variables. So where is the best place to access these runtime components if we don't access them in a controller? Best regards, Zach@Shine

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• .NET MVC - Storing database result during single page result?

  - by ropstah

  Fairly simple issue which is solved in PHP by using a static variable. private static $pages; public function Pages() { if($pages == null) { $pages = new PageCollection(); $pages->findAll(); } } Everywhere in my code I use Pages()::someFindFunction() to make sure the results are fetched only once, and I use that same collection. I want the same in my .NET MVC application: use something like: <%=MySite.Pages.findById(1).Title%> In the code below, if I use a private variable, or if I use a public class with shared variables (doesn't matter) they are both persisted during the entire application. I want them to load the same way PHP does, once per request. Now where do I store the .NET equivalent of private static $pages, so that the code below works? //what to do with $pages?? Public Module MySite Public Function Pages() As PageCollection If $pages Is Nothing Then $pages.loadAll() End If Return $pages End Function End Module

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• How to best integrate HTML/design with C# code in ASP.Net or ASP.Net MVC?

  - by LuftMensch

  We're working on a new ASP.Net site. The last major site we did was in classic ASP--the procedure we used there was to have the HTML completed first, then "bring it to life" with the ASP code. In the ASP.Net world, how does this work? I.e. how do the designers do their work if much of the mark-up is actually being generated by the server controls? We are also looking at ASP.Net MVC as a potential lightweight alternative. Would be very interested to know what was worked best for people in both scenarios in terms of working with the designers and integrating their work with the code.

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• How to get Screen Shot / Screen Capture from Web user on MVC site?

  - by RSolberg

  I've seen a few different apps that allow users to take screen shots on their PC and then the utility will automatically upload the image to the web server. I'd like to incorporate this type of functionality into a new MVC site. I could certainly just allow the user to upload their own image, but it'd be cleaner if they could click Capture Screen Shot and the image would be uploaded automatically. My team is using ASP.NET MVC2 with a SQL back end database. We are certainly willing to look into 3rd party components (activeX based, etc.) that will allow us to achieve this.

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• How can I populate highchart jQuery plugin dynamically from MVC action?

  - by Anders Svensson

  I'm trying out the Highcharts jQuery plugin for creating charts of data in an MVC application. But I need to get the data for the function dynamically from an Action Method. How can I do that? Taking the example from the Highcharts site (http://highcharts.com/documentation/how-to-use): var chart1; // globally available $(document).ready(function() { chart1 = new Highcharts.Chart({ chart: { renderTo: 'chart-container-1', defaultSeriesType: 'bar' }, title: { text: 'Fruit Consumption' }, xAxis: { categories: ['Apples', 'Bananas', 'Oranges'] }, yAxis: { title: { text: 'Fruit eaten' } }, series: [{ name: 'Jane', data: [1, 0, 4] }, { name: 'John', data: [5, 7, 3] }] }); }); How can I get the data in there dynamically from the action method? Someone suggested I might use JSon, but couldn't specify how. If this is the case, I would really appreciate a simple and specific example, because I don't know much about JSon. Any help appreciated!

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• How to deploy ASP.NET MVC application in a shared hosting without losing the beautiful uri?

  - by ZX12R

  i am trying to upload an asp.net mvc application in a shared server. I don't have access to IIS. What i have done after reading from various sources is change the route method in the global.asax file as follows routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( "Default", "{controller}.aspx/{action}/{id}", new { action = "Index", id = "" } ); routes.MapRoute( "Root", "", new { controller = "Home", action = "Index", id = "" } ); it is working fine. but the problem is i have lost the beautiful uri here. is there a way to remove the ".aspx" behind the controller..? thanks in advance.:)

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• Best practice for conditional output in ASP.NET MVC?

  - by RyanW

  I'm ramping up on ASP.NET MVC and looking at how I output messages in the view. What's the best way to do something like this? Helpers? Controls? Or just as is? <% if (ViewData.ContainsKey("message") && !string.IsNullOrEmpty(ViewData["message"].ToString())) { %> <div class="notice"> <%= ViewData["message"] %> </div> <% } %>

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• In ASP.NET MVC, why can't I inherit from "MyCustomView" without specifying the full type name?

  - by Seth Petry-Johnson

  In my MVC apps I normally declare a base view type that all of my views inherit from. I get a parser error when I specify Inherits="MyView" in my Page declaration, but not if I specify Inherits="MyApp.Web.Views.MyView". Strangely enough, it also works fine if I specify Inherits="MyView<T> (where T is any valid type). Why can I specify a strongly typed view without the full type name, but not a generic view? My base view class is declared like this: namespace MyApp.Web.Views { public class MyView : MyView<object> { } public class MyView<TModel> : ViewPage<TModel> where TModel : class { } }

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• How do you implement paging in ASP.NET MVC?

  - by Kevin Pang

  Currently, I'm using a strategy found on many blog posts. Basically, the URL contains the page number (e.g. /Users/List/5 will give you the users on page 5 of your paged list of users). However, I'm not running into a situation where one page must list two separate paged lists. How do I go about doing this using ASP.NET MVC? Do I simply provide two url parameters (e.g. /Users/List?page1=1&page2=2)? Is there a better way by using partial views?

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• ASP.NET MVC 2 client side validation not working for Html.ValidationMessage()?

  - by JuniorDeveloper

  I'm trying to get a very simple client side validation example to work in ASP.NET MVC 2. I'm using data annotations to set a required property "Surname". When I use the Html.ValidationMessageFor(x = x.Surname) the correct client side validation script is written to the page. But when I use Html.ValidationMessage("Surname") the client side validation is not rendered out until after the page has been posted. Client side validation only starts working after a form post! I can see that the script is updated in the page after a form post. There appears to be a bug in Html.ValidationMessage()?

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• How do you add a boolean attribute in asp.net mvc?

  - by bmavity

  I'm trying to output the following html using an html helper in asp.net mvc 2: <input type="text" id="Name" name="Name" value="" autofocus /> I'm using this code now: <%= Html.TextBoxFor(x => x.Name) %> and I've tried // results in <input ... autofocus="" /> <%= Html.TextBoxFor(x => x.Email, new { autofocus="" }) %> // does not compile <%= Html.TextBoxFor(x => x.Email, new { autofocus=null }) %> Is there any way to accomplish what I'm looking for using an html helper?

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