Since youre mapping from the display name and not the enum name youll need to buid a custom mapping function to scan the attributes to find the enum with that display name. Since were a big user of ioc containers, namely structuremap which was obviously a big inspiration in the design of the configuration, i tried to make automapper iocfriendly out of the box. I know this topic has been discussed multiple times over past few years, but ive read a. Add, map to, and delete items in a collection by comparing items for matches. How to handle custom properties in automapper stack overflow. As an example, you might need to map the dtos data transfer objects in. The properties should be mapped as usual, except for those that have the mapto attribute. As written on automapper webpage automapper is a simple little library built to solve a deceptively complex problem getting rid of code that mapped one object to.
You have to do some couple of extra works, but youll get more benefits rather than automapper because you can utilize same mapping loop to modify properties via callback function. For getting one dto i use map so the custom mapping that works is like this. Map for the first time, automapper will create the type map configuration and compile the mapping plan. When mapping a category to a categorydto with automapper, i would like the following behavior. Using it we can avoid writing stupic mapping code for each entity to its dto representation to send it e. Net web api project that uses automapper and structuremap to provide us with mapping and injectionbased repositories and controllers. This can be used in situations like the following where we are trying to map from an int to an unsigned int. This allows you to provide a custom mapping for one property which may rely on another destination property that you need to have already been mapped. Dec 19, 2019 because the team of the original automapper project removed several static methods with the start of v9, i created a project which keeps the most important static extensionmethods like map or projectto for easier access.
Objectobject mapping works by transforming an input object of one type into an output object of a different type. Automapper is a popular objecttoobject mapping library that can be used to map objects belonging to dissimilar types. What if we could do this mapping automatically in some way. Although automapper covers quite a few destination member mapping. This kind of mapping is also called custom mapping. As an example, you can use this to map domainmodel object to dto object. To create maps for these types, we must supply a custom type converter, and we have. Net community is the wealth of open source projects that are available to you. In this post, ill guide you how to use automapper to map one object to another. Automapper use map and projectto with parameters on same. I hasten to please you yes, you can map these two object automatically with automapper. If you dont like this approach, you can combine automapper s approach with custom value resolvers if needed. A conventionbased, open source library can help alleviate some of those coding headaches.
Automapper ii documentation automapper works with thesky, ccdsoft, and tpoint to help you automate the process of mapping points. If you were not using automapper, your post method would either have a block of manual mapping, or it would call out to a custom mapper class. Furthermore, in most applications, an automatic mapper like automapper will not be the source of major performance issues. An objecttoobject mapper such as automapper converts an input object of one type into an output object of.
Mar 14, 2017 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 mapping. Im having an issue with a particular type of mapping. Which will allow you to handle custom logic and mapping in decoupled way. In this post, well look at how to create these mappings and how to handle some more complex mapping scenarios. Add a custom mapping expression, ignore, add a custom resolver.
Subsequent mapping calls will use the compiled map. Posts in this series getting started creating mappings mapping instances intro 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. You can use resolveusing instead of mapfrom to use a custom mapping function. Mar 02, 2016 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. In this post, well look at how to create these mappings and how to. How to use automapper to map objects by order defined in the class. At my current client, there are strict rules as to the use of open source software. The logical mapping features a powerful set of functions and allows you to hook in your own methods to handle very specific needs. Have you been looking for a quick and easy way how to handle this deceptively complex problem.
Automapper allows you to add conditions to properties that must be met before that property will be mapped. It maps the properties of two different objects by. Persist methods to handle insertupdatedelete dtos to the entities. What makes automapper interesting is that it provides some interesting conventions to take the dirty work out of figuring out how to map type a to type b. There are a number of other great features in automapper custom value resolvers, custom type converters, custom actions beforeafter mapping, etc. Automapper uses a fluent configuration api to define an objectobject mapping strategy. Automapper automapper mapping 2 entities to a single class. Currently, automapper is geared towards model projection scenarios to flatten complex object models to dtos and other simple objects, whose design is better suited for. Sometimes, you need to take complete control over the conversion of one type to another. Everything software developers and managers need to.
Am i wrong in thinking that needing something like automapper. If you need a fullfeatured object mapper with minimal set up, i recommend you take a look at automapper on codeplex. Automapper, when used with an object relational mapper orm such as. May 04, 2015 setting a manual mapping configuration we can instruct automapper to map a destination objects member to a specific source objects member.
Simplify your projections with automapper visual studio. Automapper uses a conventionbased matching algorithm to match up source to destination values. Tpoint uses this information to build a model of your telescopes pointing errors. Maptester this class is for testing that properties were successfully mapped from one type to another, using an automapperinspired fluent syntax but your sourcedestination dont have to be created via automapper it doesnt care how the instances were created. The problem is that automapper aftermap runs once per mapping. Metadapper separates logical mapping schema, data translation, and validation from physical data mapping conversion to and from various file formats and apis. Net web api and mvc for example where the web api returns a customerdto which is converted to a customerviewmodel and used continue reading two way automapper mapping with child properties mapped too. Enhanced adding custom mapping types added ability for adding static custom type mappings e. Automapper map object to lookup field in ms dynamics crm. Jan 04, 2010 using custom formatters within automapper is a very simple that you can use automapper to its full potential. Oct 17, 2010 automapper is very useful and flexible tool. Why not to use tool which will allow you to handle mapping among types automatically. Now i need to tell automapper to use this custom value resolver when mapping the employeeservice. Automapper use map and projectto with parameters on same dto.
Im using automapper to do some mapping from xsdgenerated serialization object to more sane pocos. Add a custom mapping expression, ignore, add a custom resolver, or modify the sourcedestination type. If you dont like this approach, you can combine automappers approach with custom value resolvers if needed. There is no harm in handling this mapping manually for all the types but everyone knows that it is boring. At the end of this article, you will be having a very good understanding of the following pointers. If you dont need to define any custom mapping logic for the reverse. Am i wrong in thinking that needing something like automapper is an indication of poor design. This one came up on the mailing list, so i thought i might as well blog about it and fill in the documentation. So if you attach an aftermap extension to this mapping it will run it on each mapping between a foo and a bar. Let us take an example to understand why is there a need of a tool like automapper.
We need to map each employee properties to the correspondent employeedto properties using automapper as shown in the below image. Trusted by thousands of teams, jira offers access to a wide range of tools for planning, tracking, and releasing worldclass software, capturing and organizing issues, assigning work. If you don t need to define any custom mapping logic for the reverse. Implementing custom valueresolver for mapping with automapper.
May 06, 2009 automapper feature custom type converters 6 may, 2009. Once you have your types you can create a map for the two types using a mapperconfiguration and createmap. Maybe have the main markdown page or the wiki have extension section saying this is available, with full disclosure that you dont approve but some people think its important. Tired of mapping your classes from one format to another. Mapping objects part 3 of 7 nested mapping taswar bhatti march 9, 2011 10 comments 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.
Takes out all of the fuss of mapping one object to another. How to use automapper to map objects by order defined in. I have a dto that requires a custom mapping based on a parameter. This is useful when the default mapping which search for a member with the same name doesnt produce the correct result.
Creating mappings 06 january 2014 posts in this series. Mapping points refers to the process of moving the telescope around the sky and measuring how far off your pointing is. Simplify your projections with automapper visual studio magazine. Im still not sure i understand mapfrom is designed to map straight from properties it still pulls the value from the reference to the object being mapped from, while resolveusing is designed to allow virtually any mapping logic. In the latter case, you would have a line or two calling that helper class instead of a line calling automapper. In this case, i have to read the value of the attribute to find the target property. Automapper will ignore null reference exceptions when mapping your source to your target. Profiles can be added to the main mapper configuration in a number of ways, either directly. The automapper is an opensource library present in github. May 04, 2016 im on a combine these two nuget packages in web api kick lately, so lets keep that going. If you need a quickanddirty solution, maybe the following code could help you out.