MVC :: Handling Error Using Action Filter?
Jul 14, 2010
I need to create application wide error handling mechanism. I was evaluating Action Filter for that matter. But- Action filter will just exectute against actions/controller- what about error at custom view engine or Extension method for HTML helper.: to handle them i need to implement traditional Asp.net mechanismCan anyone suggest best common approach which can handle error for all Controller, View, Model or custom helpers if any.
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Mar 17, 2010
I have decorated my base controller with a couple of action filters. They work fine.
One of those filters sets up the request - does things like set the culture based on the domain, etc.
I also have a handful of actions that require authorization using the Authorize attribute.
My problem is that when an user attempts to request a page they are not authorized to access, the authorization filter kicks in and redirects them to a page telling them that they cannot vie the page.
The issue is that the action filters never run so the culture and other request data is never set. This effectively causes language to be wrong in the view and other data to be missing.
I know that authorization filters run first but my question is this: How can I design this such that I can ensure that certain methods are always run before the view is returned, regardless of the authorization.
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Aug 25, 2010
does a action filter override a controller filter?
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Jun 21, 2010
Does any one know how to dynamically add ActionFilter to an Action?
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Oct 29, 2010
I have an ASP.net page. That has an Ajax Toolkit Tab Control.hat has tabs.That have custom ascx controls I wrote.I have a text box that perform a search action. It is declared like this:
<asp:TextBox ID="txtPrereqSearch" runat="server"
ontextchanged="txtPrereqSearch_TextChanged"></asp:TextBox>
Nothing fancy. This format has been working for months. There's no submit button. It just posts back when I hit enter. The problem appeared when I added a second custom control using the same type of feature. Now browsers don't postback when I type something in either of these textboxes and press enter.It seems that browsers have a default way of handling one textbox in one form, but that behavior changes when the number reaches two.Is there an easy way around this? I guess I can create a hidden submit button but it seems like there is probably a better way to deal with this when the functionality is in two separate custom controls.
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Jun 30, 2010
I am new to this MVC and have a basic question related to validation. I have a create view for customer and based on the customer entity partial class metadata, I am validating the user input and its working fine as expected when the user clicks the create button.I also have a search button in the same create view, which is used for auto generation of some of the field values. When the user clicks the search button the action method create (post) is called with the corresponding button value as argument.the issue here is when the user clicks the search button most of the user input fields will be blank and the validation fails because of that.
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Feb 9, 2011
I am trying to return different views with xml and json result when say -/API/Security/Authentication/login.xml is passed or
API/Security/Authentication/login.json is passed . I have adde mapped routes for this path.
I have used the ActionFilter attribute for the Login Action Result to automatically check for xml or json and then return the appropriate view.
what to put in the Login.aspx file to render appropriate xml or json based on the above url passed ?
The code is below:
[Code]....
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Dec 10, 2010
I just learned about actionfilters yesterday and thought it would be great if i could put my meta data into a action filter and change the page title, page description etc from 1 location based on a value from the controller.
I've getting so far, but cannot seem to work out how to add the default value to the controller and pass that value to my actionfilter.
[Code]....
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Mar 29, 2011
I currently have a project that I seem to have ran into an issue regarding Roles and thought I would get some opinions on how to best handle the problem. The system will require editable, flexible roles that control not only the access of specific areas, but also the use of system functions (Adding Users, Editing Users, Viewing Reports etc.)The system currently allows users to have multiple roles, each of those roles has explicitly defined areas of access/actions, for example:
Role A can access areas 1,2,3 and can Add Users.
Role B can access areas 1,5,7 and can Modify Users.
Role C can access areas 4,6 and only View Users.
so a User could be in Roles A and C, and thus access : 1,2,3,4 and 6, and could Add and View Users.My first solution was to create a dictionary that would store all of the possible areas of access/access options into a Dictionary like so:
Dictionary<string,bool>
then when it is instantiated it pulls all of the properties from the database and then iterates through the roles to determine if they are accessible.All of that currently works just fine - however the project is quite Javascript/jQuery intensive so many of these options are called by client-side functions. I am trying to avoid having to wrap all of these client side functions with:
<%if(AccessDictionary[key])
//Enable or Disable Action
<%}%>
I am wondering about the following things: After a user logs in, what is the best way to store this Dictionary? Statically? In the Session?What would be the best method of storage such that the Dictionary will be easily accessed in the View? (As I currently see no way around wrapping my client-side functions)!
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Mar 4, 2010
If I have a Filter applied to a controller with a property defined as true.
Can I apply the same filter to one of its actions with value false to override the value for that specific action?
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Jan 6, 2011
Is it possible to edit the content of a view from a action filter.
What I am working on is a Resourcemanager that I can use to manage
my style sheets, js and other resources. I want to be able to put
lines in the the view any where like Html.ResourceManager.AddScriptFile("MyScript")
or Html.ResourceManager.AddCSSFile("MyCSS")
and at the end of the view call Html.Render(); this would then place the content of my resources at this point. My problem is that I want to put the CSS stuff at the top of the view, but them problem is that it is renderend at the end of the view, so I tought that I could use a ActionFilter to move it to the top of the view.
1) What would be the best way to do this task ?
2) Is there any resources that describe the way that the MVC framework works in more detail ?
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Jan 20, 2011
I have an app I am transitioning to MVC3 to see what the upgrade path is essentially. I've hit a snag. I believe I've run into a change that may be due to the changes for Dependency Injection in action filter attributes, but I have been unable to track down the cause, and the "correct" solution.This project uses StructureMap and NHibernate. The NHibernate session is started at the beginning of each request, and ends at the end of each request, thanks to a small module. This is just to give an idea of the stack involved...o I have a few custom Authorize attributes (Inheriting from AuthorizeAttribute) that perform some more complicated authorization logic for specific actions that they decorate. Part of their functionality involves using two repositories which they must either (a) have injected, or (b) get from the StructureMap ObjectFactory themselves. In MVC2 I was using option b, so that the CONSTRUCTOR of the attribute looked like this:
[Code]....
This worked fine, as in MVC2 the constructor was called each time the attribute was evaluated. This BREAKS in MVC3, where it would appear that this is no longer the case. Due to this apparent change, the FIRST time this attribute is evaluated, it runs fine, but each subsequent time, any calls in the repositories fails because it claims the NHibernate Session object hasn't been started! The reason being, as far as I can tell, that the CustomAuthorizeAttribute is created once, and then held in whatever state it exists in at that point for the lifetime of the application... Which means that the dependencies inside of it (Which SHOULD go out of scope at the end of each request, and be reinstantiated / fetched at the beginning of subsequent requests), are instead persisting with it becoming stale after the first evaluation.After banging my head against the desk for a few hours, I realized that simply moving these calls to the ObjectFactory into the AutorizeCore method made everything work again.Now, all of this was of course, a hack, because there wasn't a good easy to do real dependency injection into attributes in MVC2. I hear that is changed in MVC3, and I am wondering if this behavior is in response this change, and if so, what do I need to do to make this work?
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Mar 2, 2011
I need to get an image url using FileUpload Control. When i do it in the explorer it shows all files to select. But i need to show only ".jpg,.gif" files. How can i do it.
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Jul 17, 2010
I have a custom actionfilter that strips out the whitespaces before the html is rendered in browser and it is working fine. However I have been unable to unit test the custom action filter. Ideally I want to do an assert on the sample html that all whitespaces have been removed. Code looks something like this.
[Code]....
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Nov 17, 2010
I'm trying to get the current action method by this way.
ActionDescriptor actionDescriptor = filterContext.ActionDescriptor;
string actionName = actionDescriptor.ActionName;
var controllerType = filterContext.Controller.GetType();
var actionMethod = controllerType.GetMethod(actionName);
But if there're two action method with the same name, the AmbiguousMatchException will occur there. Without the ActionMethod property, how can I get the current action method now?
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Feb 25, 2010
I thought this would be easy and maybe it is but it's eluding me.
In an action filter (MVC 2) I want to add/edit one of the parameters for the type I'm passing to my action method.
I have an action method:
[Code]....
Bar is a simple class for viewData:
[Code]....
In my BarFilter action filter OnActionExecuting method I want to add a value for paramA which is not set by the view so that Bar will be fully populated in my Foo action method. I've tried various methods of adding values to ViewData, ModelState, Model etc. but I always get a null returned in Foo.
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Aug 22, 2010
How can I define a Dynamic ViewModel property in MVC 3 inside an action filter?
I am looking to have something like but inside the ActionFilter and not in the controller:
[Code]....
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Sep 27, 2010
i want to create filter in action method for filtering particular user from my database for the login program....
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Nov 14, 2010
When a server error occurs for whatever reasons (YSOD), the server will send a message via SMTP class. In my case, my company employs microsoft exchange and uses NTLM authentication for all domain users. I am authenticating users via NTLA windows integrated authentication. My question is, is it possible to utilize this authentication data, and pass it to the system.web SMTP username/password authentication scheme to send an email to me (the web developer) when the error occurs? I am pretty sure my company requires a username/pwd to send emails via SMPT on the ms exchange server.
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Jun 2, 2010
I have all my errors handling up and going but now I wish to change the error messages that they display for empty integers.I have been going through my codes but I can't to change that. For now, the error message for all numeric values are "A values is required" and I wish to change it to "<TextBoxName> cannot be empty".
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Feb 20, 2011
I'm developing my 1st MVC app using nerddinner as sample, appreciated approach. but when I come to handling error in Edit Post action using a partial class of Entitie2(include the FK) and adding roleviolations to a propertie it work just I don't know how I could validate input for a propertie in the other Entite(N:1)?
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Apr 2, 2011
Possible Duplicate: Best practices for exception management in JAVA or C# I am using class libraries and I try to put maximum code in class libraries so that it can be reused in other projects.Please advice me where I should put try catch blocks in class library functions or in front end forms (aspx pages) ?
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Oct 26, 2010
I want to do a bulk insert of data from a tab-seperated file into a MSSQL database using Linq to SQL. I have put all the inserts lined up on InsertAllOnSubmit(). Now, can anyone tell me if an exception occurs in one of the inserts, do the previous inserts rollback or the process stops or it skips that insert?
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May 4, 2010
Does it make sense to do error handling and logging inside actions methods or handle the OnException method inside the controllers. One way means writing try/catches in all the action methods even when there is nothing to be done to recover from the error. Handling this at the controller level would allow logging and redirection to an error handler page without writing try/catches inside all the action methods.
Which method makes the most sense? Here is example code of try/catches in an action method.
[HttpPost]
public ActionResult Delete(int id)
{[code]...
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Dec 2, 2010
i have a webpage built in asp.net c#. it always a user to create a new record in a db table. there are there are two input fields, text and score. text cannot be a null value so if the user doesn't input text onsubmit, the page errors out. i want to throw in some simple error handling code in the code behind page. i've tried including an if/else on_inserted method but ran into some java script errors.
[code]....
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