AutoMapper error: MapperConfiguration does not contain constructor that takes 1 arguments

Question

I am getting an error

Error: CS1729 MapperConfiguration does not contain constructor that takes 1 arguments.

from this code:

var config = new MapperConfiguration(
    options =>
    {
        options.AllowNullDestinationValues = true;
        options.AllowNullCollections = true;
        options.AddProfile(new AutomapperProfiles());
    });

Tried adding a NuGet package for Automapper.

Progman · Accepted Answer · 2025-08-15 22:27:32Z

9

The MapperConfiguration class requires an additional parameter for a logger factory since version 15.0. Check the 15.0 Upgrade Guide - Breaking Changes - MapperConfiguration page for details:

The constructor to MapperConfiguration now requires an ILoggerFactory:
public MapperConfiguration(
   MapperConfigurationExpression configurationExpression, 
   ILoggerFactory loggerFactory)
This parameter is used for diagnostics.

So you have to provide a logger factory as the second argument. Alternatively, you can use an older version of AutoMapper.

answered Aug 15 at 22:27

Progman

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1 Comment

petrusottie Aug 16 at 20:17

Thank you so much...I was using version 15.0 hence needed two arguments. Now installed 13.0.1, it works as expected. Thank you

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