Скачать или смотреть Resolving AutoMapper Custom Resolver Issues: Mapping Source Members to Destination Object Lists

Learn how to effectively tackle `AutoMapper` custom resolver challenges when mapping members from a source object to a destination object list in C# .
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Resolving AutoMapper Custom Resolver Issues: Mapping Source Members to Destination Object Lists

When working with .NET applications, managing object mappings can become quite complex, especially when dealing with nested objects and lists. If you've found yourself struggling to utilize AutoMapper's custom resolvers for mapping source members to destination object lists, you're not alone. In this guide, we'll explore a specific example of this issue and how to effectively resolve it.

Understanding the Scenario

In this particular case, we have two classes: personSrc and personDest. The personSrc class represents an individual with properties for their name, phone number, and addresses (both home and office). The personDest class is structured to include the same personal details, but it also contains a list of addresses, which can include multiple address types.

Here's a quick recap of the classes involved:

Source Object: personSrc

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Destination Object: personDest

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The Custom Resolver

To achieve the mapping from personSrc to the list of addresses in personDest, a custom resolver is essential. Here’s the initial attempt at implementing this resolver:

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

In this code, we check for the existence of home and office addresses, and if found, we create new address objects accordingly.

The Challenge

The problem arises when configuring the mapping profile. The original attempt included lines such as:

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This does not function as expected, leading to frustration when trying to perform the mapping.

The Solution

Create the Mapping Profile

The first step in resolving this issue is to create a proper mapping profile. The profile should effectively leverage the custom resolver without the complications of incorrect syntax. Here’s how it should look:

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Testing the Configuration

To check if the mapping configuration works correctly, you can run the following test code:

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Results and Conclusion

After implementing these changes, the values from personSrc should map seamlessly into the personDest object's addresses list. If done correctly, this mapping should function as anticipated, fulfilling the requirements laid out at the beginning.

Final Thoughts

Custom resolvers in AutoMapper can initially seem challenging, especially when transitioning from source to destination class structures. By understanding the proper syntax and ensuring the mapping profile is set up correctly, you can handle more complex mapping scenarios effectively. If you experience ongoing issues, consider revisiting your mappings to ensure everything is correctly configured.

In conclusion, you were on the right track; it was all about the correct profile implementation. Feel free to try the suggested solution and see if it resolves your issue. Happy coding!