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Mapster Icon

Mapster - The Mapper of Your Domain

Writing mapping method is machine job. Do not waste your time, let Mapster do it.

Get it

PM> Install-Package Mapster

Basic usage

Mapping to a new object

Mapster creates the destination object and maps values to it.

var destObject = sourceObject.Adapt<Destination>();

Mapping to an existing object

You make the object, Mapster maps to the object.

sourceObject.Adapt(destObject);

Queryable Extensions

Mapster also provides extensions to map queryables.

using (MyDbContext context = new MyDbContext())
{
    // Build a Select Expression from DTO
    var destinations = context.Sources.ProjectToType<Destination>().ToList();

    // Versus creating by hand:
    var destinations = context.Sources.Select(c => new Destination {
        Id = p.Id,
        Name = p.Name,
        Surname = p.Surname,
        ....
    })
    .ToList();
}

What's new in Mapster 5.0

Why Mapster?

Performance & Memory efficient

Mapster was designed to be efficient on both speed and memory. You could gain 5x faster while using only 1/3 of memory. And you could gain to 12x faster with

Method Mean StdDev Error Gen 0 Gen 1 Gen 2 Allocated
'Mapster 5.0.0' 141.84 ms 0.931 ms 1.408 ms 31250.0000 - - 125.12 MB
'Mapster 5.0.0 (Roslyn)' 60.48 ms 1.186 ms 1.993 ms 31222.2222 - - 125.12 MB
'Mapster 5.0.0 (FEC)' 58.17 ms 0.231 ms 0.442 ms 29714.2857 - - 119.02 MB
'Mapster 5.0.0 (Codegen)' 51.56 ms 0.312 ms 0.524 ms 31200.0000 - - 125.12 MB
'ExpressMapper 1.9.1' 299.05 ms 2.081 ms 3.146 ms 60000.0000 - - 241.85 MB
'AutoMapper 9.0.0' 708.06 ms 3.398 ms 5.137 ms 91000.0000 - - 364.69 MB

Step into debugging

Step-into debugging lets you debug your mapping and inspect values as same as its your code. image

Code Generation

Mapster CodeGen lets you do mapping with

  • Validate mapping at compile time
  • Getting raw performance
  • Seeing your mapping code & debugging
  • Finding usage of your models' properties

Change logs

https://github.com/MapsterMapper/Mapster/releases

Usages

https://github.com/MapsterMapper/Mapster/wiki

Acknowledgements

JetBrains kindly provides Mapster with a free open-source licence for their Resharper and Rider.

  • Resharper makes Visual Studio a much better IDE
  • Rider is fast & powerful cross platform .NET IDE

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