Resolving AutoMapper.AutoMapperMappingException: Configuration Issues in .NET Core

A guide to solving `AutoMapper` configuration errors in .NET Core applications with step-by-step solutions.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: AutoMapper.AutoMapperMappingException: Missing type map configuration or unsupported mapping in .NET CORE

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Resolving AutoMapper.AutoMapperMappingException: Configuration Issues in .NET Core

If you’re a .NET Core developer, you may have encountered the perplexing AutoMapper.AutoMapperMappingException which can leave you scratching your head. In this guide, we’ll explore the reasons behind this exception and walk you through the steps to resolve it effectively.

Understanding the Problem

You might face this exception when trying to map data from one object type to another using AutoMapper. Typically, it manifests as a message indicating that there is a "Missing type map configuration or unsupported mapping." This error often arises due to the AutoMapper configuration not being recognized or not properly set up in your application.

Example Scenario

Solutions to Fix the Mapping Exception

To resolve the exception, follow these structured options to properly configure AutoMapper in your .NET Core application.

Option 1: Custom AutoMapper Configuration

Create a Custom Extension Method: This method will help in defining the configuration more cleanly.

[[See Video to Reveal this Text or Code Snippet]]

[[See Video to Reveal this Text or Code Snippet]]

Option 2: Using AutoMapper.Extensions.Microsoft.DependencyInjection

A simpler and often preferred approach is to use the AutoMapper.Extensions.Microsoft.DependencyInjection NuGet package. This package automatically scans for profile classes, making configuration easier.

Install the NuGet Package: Ensure you have the package added to your project. If not, you can install it via the NuGet Package Manager:

[[See Video to Reveal this Text or Code Snippet]]

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By applying one of the above options, you should be able to eliminate the AutoMapper.AutoMapperMappingException and successfully map your object models. Whether you choose the first custom configuration for flexibility or the automatic scanning of profiles with the second option, both methods will help ensure your mappings are correctly recognized by AutoMapper.

Remember to always debug and verify that all your mappings are correctly set up and enjoyed a smoother development experience in your .NET Core applications!

If you have any further questions or run into issues, feel free to reach out or leave a comment. Happy coding!