Automapper map nested collection

Back to: C. Please read our previous article before proceeding to this article where we discussed the basics of Automapper in C with some simple examples. When both the type involved in the mapping contains properties of the complex type then in such scenarios we need to use the AutoMapper Complex Mapping in C. Let us understand the AutoMapper Complex Mapping with an example.

We are going to use the following four classes for this demo.

automapper map nested collection

To make this demo simple, here we created both the classes with the same property names. But the thing that we need to keep in mind here is, we created the address property as a complex type. Then we are creating a static method i. InitializeAutomapper where we write the mapping code as shown in the below image. Now, when you run the application, you will get the following runtime exception.

Now, if you go the inner exception and check the message property, then it clearly shows that mapping type configuration is missing for Address and AddresDTO. So, change the InitializeAutomapper method as shown below.

With the above changes in place, now, if you run the application and then you will get the output as expected as shown in the below image. Let us understand this with an example. Now run the application. It should give you the following error. This is because the property name for addressDTO is not found in the Employee object. So we get the null reference error. To solve the above issue we need to map the address property to addressDTO property in the mapper configuration as shown in the below image.

With the above changes in automapper config, now run the application and it will give you the result as expected. When you run the application, it will not give you any error, but it will not map the City and State property as shown in the below output.

To map the above two properties we need to change the InitializeAutomapper class as shown below. With the above changes in place, now run the application and see the output as expected as shown in the below image. In the next article, we will discuss how to map complex type to primitive types using automapper in C. I would like to have your feedback. Please post your feedback, question, or comments about this article. Your email address will not be published. Skip to content. Previous Lesson AutoMapper in C.

Leave a Reply Cancel reply Your email address will not be published.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Already on GitHub? Sign in to your account. The collection mapper doesn't consider the existing values in the destination collection the collection is cleared first. Whether it should, I'm not sure, cc jbogard. This is one of the things TylerCarlson1 solved in a PR he had open, to consider existing values using equality comparers. Collection has this functionality. There's also a NuGet with the same name. If you want to use this dll you need to have Id's not be ignored, else it's not going to recognize equivalency between the two classes and know they map to each other.

Can do equality comparison expressions or use the EF model to figure out the primary key and compare only on that. This will go away whenever the PR gets merged. First of all please accept my apologies I am a little bit modify code example already with using Automapper. And as you can see is nothing changed in results compared initial code sample. Property Property2Id is setting up by default value 0 but should leave is at is. Second point is collection item is not equals by reference.

May be I am not correct using this extension please correct me. Did you add Mapper. It's required to make Automapper. Collection work. If you are using it with Entity Framework you might want to look at AutoMapper.In this part we learn about Nested Mapping in Automapper and we will use the same OrderDto Object that we had previously but we will let Automapper to map the inner objects.

Have you used an sql profiler to see the queries sent to the database? The code might look clean but might hide some unoptimized sql queries, that will not be good on production. Valid point but in my demo I am not using sql, my repository is just a bunch of objects that are manually created. I do use sqlserver in another project and have not found a big performance issue since we have a dba who is optimizing all the time, and in my last part of this series I will be showing some tips on performance with Automapper.

OrderNo. How I can map property from nullable nested object?

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In situation when orderItem. Or you could consider Ignore so that it doesnt map. Do you still use Automapper or there is a better alternative to this?

I am having challenges mapping multiple sources into a single destination. For example…If you were only bringing back a single Order with multiple Order Items. Map orders ; I think without the IEnumerable on the parent, it is not loading the child list.

My code samples got messed up when I hit Post. I hope you get the gist of what I am saying. I will try it again. Nice artical with good explanation. Your email address will not be published. Anti-Spam Quiz: what colors is banana or minion? Currently you have JavaScript disabled. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page.

Click here for instructions on how to enable JavaScript in your browser. June 10, - No Comments. June 7, - No Comments. If you want to see my LinkedIn profile, click on this button:. Taswar Bhatti The synonyms of software simplicity. Home Contact About. Once again here is the Domain Objects First. GetTotalPrice. GetAll ; Mapper. OrderNo ; Mapper.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project?

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automapper map nested collection

Already on GitHub? Sign in to your account. I'm new to AutoMapper and i have the following manual mapping in CustomerService in Service Layer in my application, where i tried to find out the equivalent AutoMapper mapping code but i couldn't due to nested and complex objects and collections, so please help me to resolve this issue. Customer is the DataContract and Data. Customer is the Entity. How to reflect this hierarchy using AutoMapper Thanks in advance. What is your AutoMapper configuration right now?

On Wed, Jul 31, at AM, jivara notifications github. So i truely need your help applying AutoMapper on the above hierarchy so i can use it as a case study ever after in my development.

I tried the following for the cusomer with the nested orders, even i tried to neglect the the nested OrderDetails and Product temporarily till i find out the way then refactor the code but the following code only map the customer and assign null for the nested Orders attribute:. Order, Service. Customer, Service. Orders ; Service. Hi, I don't use configuration i replace the old mapping code by the automapper code in the WCF Service layer in the service operations, where it is called by client code from another project, and it is working fine but the nested collections are not mapped and always null.

So i hope if you can just show me how the AutoMapper code could be, even partially and i will find out how to complete because i find AutoMapper very promising and want to replace my old mapping code by AutoMapper. OrderDetail, Service. But without seeing your AutoMapper configuration, I can't see what's missing. Are you calling CreateMap at all?

On Thu, Aug 1, at AM, jivara notifications github. Hi, Thank you very much for bearing with me, it is now working very nice. Just another issue, in one case when mapping the all customers i need to ignore orders attribute, but in another case when i want to map one customer or limited number of customers i want to map orders, in this seconed case i use another CreateMap statement which doesn't ignore orders but when loading data i find that orders are null.

So how to ignore a property in one mapping and include it in another. Thanks for your valuable help. Typically, I do this by creating different destination types.

It's tricky in your scenario if you want for the same exact WCF call, different behavior for different customers. Or different calls, but you're re-using the types. So I try not to share contracts across different WCF operations. Does that make sense? That way, I don't expose "Orders" on the contract if it's not supposed to be there. On Thu, Aug 1, at PM, jivara notifications github. Thanks again, i thought about this solution but i thought also that may there is a built-in feature for such situation.

Please help me resolve this last piece of the puzzle and the most important one. Thanks for your very valuable help.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I have tried a wide variety of mapping configurations, but the only thing that I've been able to make work is this:.

This works but seems to be way more complicated than it should be - I feel dirty calling a mapping within a mapping config. When dealing with collections, the trick is always to set up a mapping of the items in the collections and never well, I've never seen a case that needed a mapping from one collection to another.

automapper map nested collection

That's the point of the generic. The trick I always use is to work backwards, starting with a mapping between the types inside the collections and then going up a level. If one object needs to go up 2 levels, it's time to use ForMember to get to a nested property. Sign up to join this community. The best answers are voted up and rise to the top. Automapper - Mapping a nested collection to a list Ask Question.

Asked 5 years, 10 months ago.

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Active 5 years, 8 months ago. Viewed 84k times. I'm having an issue with a particular type of mapping.

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ToList ; This works but seems to be way more complicated than it should be - I feel dirty calling a mapping within a mapping config. Is this the best I can hope for or is there a better way? Rob H Rob H 1 1 gold badge 2 2 silver badges 4 4 bronze badges. Active Oldest Votes. What you want to do in this case is to set up the following mappings: Mapper. SourceList. Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Ben answers his first question on Stack Overflow. The Overflow Bugs vs.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I am having trouble trying to map a list to another listed in a nested model. Kind of and un-flatten of sorts. The problem is I don't know how to do the mappings.

NestedList' must resolve to top-level member. Parameter name: lambdaExpression. They each contain different elements, ItemModel and Item respectively. So, they need to be mapped. Then all you should have to do is call Mapper.

Map between Source and Destination :. Learn more. AutoMapper map from source nested collection to another collection Ask Question.

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Asked 8 years, 4 months ago. Active 5 years, 10 months ago. Viewed 18k times. Parameter name: lambdaExpression I then tried something like this:. How do I map this? There is a mapping already defined between Item and ItemModel, but the mapping is not being triggered because NestedList belongs to a DestinationModel which in turn belongs to DestinationNestedViewModel. Active Oldest Votes.

I think you want something like this: Mapper. SourceList ; Then all you should have to do is call Mapper. Map between Source and Destination : Mapper. Andrew Whitaker Andrew Whitaker k 27 27 gold badges silver badges bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.

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AutoMapper Complex Mapping in C#

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