Error Handling Method 3: Day 3 of 23

This article describes error handling using global filters for all controllers.

To learn other error handling method, you can see following articles:
Step 1

Create a MVC project from the "Empty" template. Right-click on "Controllers" and select "Add" >> "Controller...".

Step 2

Select "MVC 5 Controller - Empty" to add an empty controller. Click on the "Add" button.

Step 3

Name the controller "HomeController". The Index() action result method will be added.

Step 4

To add a view, right-click on "Index" and select "Add View...".

Step 5

Name the view and select "Empty (without model)" as the template. Click on the "Add" button.

Step 6

Now we need to create a custom error page so that when an error occurrs, this custom error page is displayed. This error page is common for all kinds of errors generated through any page. So we create it under the shared folder. Right-click on “Views”, select “Add” >> “New Folder”.

add new folder

Step 7

Name the folder "Shared", this will create a "Shared" folder under the view.

shared folder

Step 8

Right-click on the "Shared" folder and select "Add" >> "View…".

view option

Step 9

Name the view "Error" and select "Empty (without model)" as the template.

Empty without model

Step 10

Design your desired custom error page in Error.cshtml.

error cshtml

Step 11

Open the web.config file, set the customErrors mode=”On” under system.web. If you do not want to display a custom error page then you can set it to “Off”.

custom error model

Step 12

Generate an exception inside the index action method.

home controller

Step 13

Right-click on “App_Start”, select “Add” >> “Class…”.

add new controller

Step 14

Select “Class” from the installed templates and provide an appropriate name like "ErrorConfig".

error coding

Step 15

In the following code snippet you can see the static method that accepts a GlobalFilterCollection and adds our HandleErrorAttribute into the filter collection or we can say the register global filter. Without any additional modification in the controllers and their action methods we add a HandleErrorAttribute for all the controllers.


Step 16

Now call this static method inside the Application_Start event of Global.asax.cs, so that it will be implemented as soon as the application starts.


Step 17

Now run the project and you will get a NullReferenceException since the session "temp" is not available.

null reference expectiona

Step 18

Press "F5" and our custom error page is displayed.

custom error page

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