Automapper vs custom mapping software

My list of automapper disadvantages which you should consider before. Why not to use tool which will allow you to handle mapping among types automatically. Dont create your own mapper, let automapper do the job. It is all about writing less boilerplate code in your data access layer and also. An objectto object mapper such as automapper converts an input object of. Its used quite a lot to map entity classes to viewmodeleditmodel. A conventionbased, open source library can help alleviate some of those coding headaches. Free source code and tutorials for software developers and architects updated. Take a moment to compare this to the automapper method below and ask yourself which is. Modelmapper is an object to object mapping library that eliminates repeatable code for copying objects from one representation to another. In this post, well look at how to create these mappings and how to handle some more complex mapping scenarios. Translating objects of one type to another with automapper. If you dont like this approach, you can combine automapper s approach with custom value resolvers if needed.

Whilst i am a big fan of automapper and use it in most projects i work on, especially for domain to viewmodel mapping, when in comes to data access code, automapper is not so useful. The way im doing it works since i just pass the domainmodel to the constructor for the viewmodel, but since im using automapper on. That sucks to write, it sucks to read, it sucks to maintain. If you were not using automapper, your post method would either have a block of manual mapping, or it would call out to a.

Setting a manual mapping configuration we can instruct automapper to map a destination objects member to a specific source objects member. Automapper is also very flexible, allowing for you to design an. To install this library, open the package manager console and enter the following command to install the automapper library. If you have not yet had the opportunity to use jimmy bogards automapper yet for data transfer mappings between objects, it is truly a great simple way to convert. In this case, i have to read the value of the attribute to find the target property. Im definitely a fan of keeping software architecture as simple and as minimal as. I have more uptodate results than these, including updated versions of agilemapper, automapper and mapster.

When it comes to api design, static classes are a bit of a bugbear. Although automapper covers quite a few destination member mapping. For getting one dto i use map so the custom mapping that works is like this. We have quite a few applications that used automapper in the past and its a pain in the ass to work with, mostly because it was used wrong in a lot of the places such as mapping an entire ordercustomer. Objectobject mapping works by transforming an input object of one type into an output object of a different type. Add a custom mapping expression, ignore, add a custom resolver, or modify the sourcedestination type. Automapper feature custom type converters 6 may, 2009. There is no harm in handling this mapping manually for all the types but everyone knows that it is boring. But for certain models where property and class names are very.

There is a automapper class which you can use to map between two objects. Automapper tutorial conditional mapping automapper allows you to add conditions to properties that must be met before that property will be mapped. Simplify your projections with automapper visual studio. You cannot have separate configuration for inmemory vs. There are other mapping issues that have to be addressed, and to the author of automappers credit, a lot of work has been done to reduce the performance penalty of runtime. I spent a considerable amount of time trying to get mvc to work nicely with various file uploaders while i was writing rustyshark, and i have to admit its been pretty frustrating at times. To put it simply, automapper only works with inmemory data, not the iqueryable interface which is more typically used in dal scenarios. I dont know that these kind of bugs are possible with automapper or not. In this post, ill guide you how to use automapper to map one object to another. Creating mappings 06 january 2014 posts in this series. The way im doing it works since i just pass the domainmodel to the constructor for the viewmodel, but since im using automapper on some of my onetoone viewmodels, i thought id try and learn how to do the mapping across all viewmodels heres an example of a viewmodel that does a little extra. Automapper provides mapping between one class object to another class object.

Takes out all of the fuss of mapping one object to another. So if you attach an aftermap extension to this mapping it will run it on each mapping between a foo and a bar. The convertusing expressionbased method will be used for both inmemory mapping and linq projections. Once you have your types you can create a map for the two types using a mapperconfiguration and createmap. Automapper is a conventionsbased mapping system that allows you to copy values. As an example, you might need to map the dtos data transfer objects in. Glue vs automapper vs emit vs valueinjecter entity mappers. In most cases, the values will be mapped if the name and type of the properties match in both the source and destination objects. To install the library, first install the nuget package manager in your visual studio.

Tired of mapping your classes from one format to another. Allow for edge cases for resolving values from other places custom typetype mapping, individual member mapping, and some really crazy edge cases. But please, dont create your own mapper, there are tools out there which. Have you been looking for a quick and easy way how to handle this deceptively complex problem. If you need to get access to mapping configuration or a mapper object. Automapper uses a conventionbased matching algorithm to match. In part 5, we will use a powerful feature that automapper allows us, which is customresolver lets look at our domain object which. Translating objects of one type to another with automapper dror. The automapper is an opensource library present in github. Ive got a viewmodel that takes some model data and slightly alters it. Net community is the wealth of open source projects that are available to you. Automapper versus extension methods versus implicit casts.

Automapper vs valueinjecter closed ask question asked 9 years, 2 months ago. Map for the first time, automapper will create the type map configuration and compile the mapping plan. The problem is that automapper aftermap runs once per mapping. Automapper will ignore null reference exceptions when mapping your source to your target. Cso two business people connecting and solving a puzzle. In the previous post, we looked at how to centralize our automapper mapping definitions in a config class that we can run at application start. Net developers to name their most installed and used packages, id be surprised if the majority didnt have automapper on their list. Automapper use map and projectto with parameters on same.

For most object models, modelmapper does a good job of intelligently mapping source and destination properties. Automapper ii documentation automapper works with thesky, ccdsoft, and tpoint to help you automate the process of mapping points. Software development consultant a blog about code anecdotes, a summary of past necessities and exploration. A conventionbased, open source library can help alleviate some of those coding. Automapper is a popular objecttoobject mapping library that can be used to map objects belonging to dissimilar types. When mapping a category to a categorydto with automapper, i would like the following behavior. This one came up on the mailing list, so i thought i might as well blog about it and fill in the documentation. Software engineering stack exchange is a question and answer site for professionals, academics, and students working within the systems development life cycle. I have a dto that requires a custom mapping based on a parameter. But at the same time such tests are extremely tedious to write and moreover they are shortlived. Mapping entity framework entities to dtos with automapper.

But weve got new versions of agilemapper, automapper and mapster the latter including a fix for the bug i found writing my last blog on this subject. Automapper uses a fluent configuration api to define an objectobject mapping strategy. Quite often in our development projects which use automapper we will not only want to convert an object a to an object b but also from b to a. How to use automapper to map one object to another. Is automapper used widely in enterprise applications. The properties should be mapped as usual, except for those that have the mapto attribute. You can read this article to find out why you should not be using mapper. Avoid using automapper when you have a significant percentage of custom configuration in the form of ignore or mapfrom.