---
title: "What are AggregateExceptions and how can they be handled when dealing with asynchronous code in MVC?"  
description: "What are AggregateExceptions and how can they be handled when dealing with asynchronous code in MVC?"  
author: "Utpal Vishwas"  
published: 2023-06-04  
updated: 2023-06-06  
canonical: https://www.mindstick.com/forum/158638/what-are-aggregateexceptions-and-how-can-they-be-handled-when-dealing-with-asynchronous-code-in-mvc  
category: "asp.net mvc"  
tags: ["exception handling", "asp.net mvc", "mvc"]  
reading_time: 2 minutes  

---

# What are AggregateExceptions and how can they be handled when dealing with asynchronous code in MVC?

What are AggregateExceptions and how can they be handled when dealing with [asynchronous code](https://www.mindstick.com/forum/160100/how-do-promises-in-javascript-simplify-asynchronous-code-compared-to-callbacks) in [MVC](https://www.mindstick.com/forum/155803/define-cache-profile-in-mvc)?

## Replies

### Reply by Aryan Kumar

An AggregateException is a special type of exception that can contain multiple nested exceptions. It is often used to handle [asynchronous](https://www.mindstick.com/blog/178/synchronous-and-asynchronous-command-execution-in-c-sharp-dot-net) [code](https://yourviews.mindstick.com/view/85458/alan-turing-the-mastermind-behind-cracking-the-enigma-code-during-world-war-ii) in MVC, as it allows you to catch all of the exceptions that occur in a single request.

To handle AggregateExceptions in MVC, you can use the following steps:

- Add the following using statement to your code:

Code snippet

```plaintext
using System.AggregateException;
```

- In your controller action, use the following code to catch AggregateExceptions:

Code snippet

```plaintext
try
{
  // Do your asynchronous work here.
}
catch (AggregateException ex)
{
  // Handle the exceptions here.
}
```

- In your catch block, you can use the following code to iterate through the nested exceptions and handle them individually:

Code snippet

```plaintext
foreach (var innerException in ex.InnerExceptions)
{
  // Handle the inner exception here.
}
```

Here is an example of how to handle AggregateExceptions in MVC:

Code snippet

```plaintext
public ActionResult Index()
{
  try
  {
    // Do some asynchronous work here.
  }
  catch (AggregateException ex)
  {
    // Handle the exceptions here.
    foreach (var innerException in ex.InnerExceptions)
    {
      // Log the exception.
      // Redirect to an error page.
    }
  }
}
```

By following these steps, you can handle AggregateExceptions in MVC and ensure that your application is robust and reliable.

Here are some additional tips for handling AggregateExceptions:

- Always use a try-catch block when working with asynchronous code.
- Use the AggregateException class to catch multiple nested exceptions.
- Iterate through the nested exceptions in the catch block and handle them individually.
- Log the exceptions and redirect to an error page.


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Original Source: https://www.mindstick.com/forum/158638/what-are-aggregateexceptions-and-how-can-they-be-handled-when-dealing-with-asynchronous-code-in-mvc

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