How to AutoMapper a Source's Member's Property to Destination Property

Описание: Learn how to effectively map properties between source and destination objects using `AutoMapper` in C# . This guide simplifies the process of transferring values from `AnotherClass.SourceString` to `MyDestinationClass.DestinationString`.
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How to AutoMapper a Source's Member's Property to Destination Property

When working with object mapping in applications, especially in C# , the AutoMapper library is an invaluable tool that can save you time and reduce boilerplate code. However, not all property mappings are straightforward. In this guide, we'll explore a common scenario where you need to map a specific member's property from a source class to a destination class. Specifically, we'll answer the question: How do you map SourceString from AnotherClass to DestinationString in MyDestinationClass?

Understanding the Problem

In the provided code snippet, we have three classes: MySourceClass, AnotherClass, and MyDestinationClass. The goal is to transfer the data from SourceString, which is a property of AnotherClass, into DestinationString, a property of MyDestinationClass. The challenge arises because these properties are nested within different classes and have different names.

Here’s a quick look at the classes involved:

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In order to accomplish this mapping, we need to create a specific configuration within AutoMapper. Let's dive into the solution!

Setting Up the Solution

To correctly configure AutoMapper for our mapping needs, you will need to follow these steps:

1. Create a Mapping Configuration

You will first need to create a mapping configuration that will tell AutoMapper how to connect the properties of AnotherClass with those of MyDestinationClass. Here's how it looks in code:

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2. Explanation of the Mapping Configuration

CreateMap AnotherClass, MyDestinationClass (): This line establishes a mapping configuration between the source type AnotherClass and the destination type MyDestinationClass.

ForMember(): This method allows you to specify which member of the destination class you want to configure.

dest = dest.DestinationString: Here we define the destination property that will receive the value.

opt = opt.MapFrom(): This indicates where to get the value from in the source object.

src = src.SourceString: This is the property in the source object that contains the value we want to map.

3. Apply Your Configuration

After this mapping is set up, you can use AutoMapper in your application. When you create an instance of MyDestinationClass using an instance of MySourceClass, it will automatically populate the DestinationString from SourceString in AnotherClass.

Example Usage

Here is a simple usage example to illustrate the mapping in motion:

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Conclusion

Mapping properties between nested classes in C# with AutoMapper is straightforward once you set up your mappings correctly. By utilizing the CreateMap and ForMember methods effectively, you can ensure that values are transferred seamlessly from source to destination, even when property names differ.

By following the steps outlined in this post, you can enhance your application's data handling capabilities with precise mappings that reflect your data structure. Happy coding!