Starting a project using NetTopologySuite fails

[pierrosv]

I followed the instructions to enable the use of postgis in my .net EF Core 2.2 project but once the DbContext initializes I get the following error.

Could not load type 'GeoAPI.NetTopologySuiteBootstrapper' from assembly 'NetTopologySuite, Version=2.0.0.0, Culture=neutral, PublicKeyToken=f580a05016ebada1'.

[roji]

Any chance you're trying to use EF Core 2.2 with Npgsql 4.1.0? If so, that's not going to work. Npgsql.NetTopologySuite 4.1.0 will only work with Npgsql.EntityFrameworkCore.PostgreSQL.NetTopologySuite 3.0.0 and vice versa.

[pierrosv]

@roji

Hi thank you for your reply. I am using the following versions:

NetTopologySuite (2.0.0) Npsql.EntityFrameworkCore.PostgreSQL (2.2.4) Npsql (4.0.10) Npsql.EntityFrameworkCore.PostgreSQL.NetTopologySuite (2.2.4) Npsql.NetTopologySuite (4.0.10)

I haven't been able to locate any references to a similar issue. I build a project from scratch using the latest stable versions for all relevant libraries. Let me know if there is something else I can share wih you.

[roji]

Somewhere in your dependency graph, NetTopologySuite 2.0.0 is being referenced - that is the problem.

Try doing dotnet restore again, Anne of it still doesn't work, post your csproj.

[pierrosv]

@roji

Thank you very much for your help. That was the issue. I was referencing NetTopologySuite to get access to Point, Polygon etc. but actually that was not needed since I could have them through the interfaces from GeoAPI.

I appreciate your help, I could not have resolved this

[roji]

Great. Note that it's fine to reference NetTopologySuite directly and used the classes rather than the geoapi interfaces. The issue was that you were referencing the wrong version.

[auspex]

Could you explain a little more, please? @pierrosv said he was using NetTopologySuite 2.0.0, and it seems to me like he should be. Since I'm having the same problem, I really need to know what I should be using. My packages are listed below—I have my doubts about that NetTopologySuite.Core

$ dotnet list package --include-transitive
Project 'uk.ac.sahfos.cpr.console.web' has the following package references
   [netcoreapp2.2]: 
   Top-level Package                                                  Requested   Resolved
   > BuildBundlerMinifier                                             2.6.362     2.6.362 
   > Grid.AspNetCore.Mvc                                              1.0.0       1.0.0   
   > HtmlAgilityPack                                                  1.11.16     1.11.16 
   > Humanizer                                                        2.6.2       2.6.2   
   > Microsoft.AspNetCore.All                                   (A)   [2.2.0, )   2.2.0   
   > Microsoft.EntityFrameworkCore.Design                             2.2.4       2.2.4   
   > Microsoft.EntityFrameworkCore.SqlServer.NetTopologySuite         2.2.6       2.2.6   
   > Microsoft.Extensions.Caching.Memory                              2.2.0       2.2.0   
   > Microsoft.Extensions.Logging.Debug                               2.2.0       2.2.0   
   > Microsoft.NETCore.App                                      (A)   [2.2.0, )   2.2.0   
   > Microsoft.VisualStudio.Web.BrowserLink                           2.2.0       2.2.0   
   > Microsoft.VisualStudio.Web.CodeGeneration.Design                 2.2.0       2.2.0   
   > NetTopologySuite                                                 2.0.0       2.0.0   
   > Novell.Directory.Ldap.NETStandard                                2.3.8       2.3.8   
   > Npgsql.EntityFrameworkCore.PostgreSQL                            2.2.4       2.2.4   
   > Npgsql.EntityFrameworkCore.PostgreSQL.NetTopologySuite           2.2.4       2.2.4   

   Transitive Package                                                                   Resolved
   > GeoAPI.Core                                                                        1.7.5   
   ...
   > Microsoft.AspNetCore                                                               2.2.0   
   ...
   > Microsoft.EntityFrameworkCore                                                      2.2.6   
   ...
   > NetTopologySuite.Core                                                              1.15.1  
   > NetTopologySuite.IO.PostGis                                                        1.15.0  
   > NetTopologySuite.IO.SqlServerBytes                                                 1.15.0  
   > Npgsql                                                                             4.0.7   
   > Npgsql.NetTopologySuite                                                            4.0.4.1 

[roji]

The following combinations are OK:

• Npgsql.EntityFrameworkCore.PostgreSQL.NetTopologySuite 2.2.x, Npgsql.NetTopologySuite 4.0.x, NetTopologySuite 1.x
• Npgsql.EntityFrameworkCore.PostgreSQL.NetTopologySuite 3.x, Npgsql.NetTopologySuite 4.1.x, NetTopologySuite 2.x

Your dependency graph shows Npgsql.EntityFrameworkCore.PostgreSQL.NetTopologySuite 2.2.4 being used with NetTopologySuite 2.0.0, which won't work. Remove your explicit reference to NetTopologySuite 2.0.0 and let nuget resolve the version (which will be 1.x).

[auspex]

Thanks!