Error Handling Method 4: Day 4 of 23

This article explains error handling using global filters for all controllers and how to display a custom view.

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 many kinds of errors generated by any page. So we create it under the shared folder.

Right-click on “Views”, select “Add” >> “New Folder”.



Step 7

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



Step 8

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



Step 9

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



Step 10

Design your desired custom error page in Error.cshtml.



Step 11

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



Step 12

Let's create a page that we want to display (not an error page). in other words help page. This page we should create under the “Shared” folder.

Right-click on the “Shared” folder, select “Add” >> “View…”.



Step 13

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



Step 14

Design your desired help page in Help.cshtml.



Step 15

Generate an exception inside the index action method.



Step 16

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



Step 17

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



Step 18

In the following code snippet you can see the static method that accepts a GlobalFilterCollection. Create an object of HandleErrorAttribute and set the view that you want to display when an exception is thrown. Then add a HandleErrorAttribute object to the GlobalFilterCollection.



Step 19

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



Step 20

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



Step 21

Press "F5" and it displays a help page, not an error page.

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