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TypeLoadException on mono 4.2.1 #424
Description
I am getting this exception when I try to use Dapper on mono
System.TypeInitializationException: The type initializer for 'Dapper.SqlMapper' threw an exception.
---> System.TypeLoadException: Failed for unknown reasons.
Looking at the type initializer code of SqlMapper and the mono documentation, it seems that
AddTypeHandlerImpl(typeof(IEnumerable<Microsoft.SqlServer.Server.SqlDataRecord>), new SqlDataRecordHandler(), false);
is the culprit - Microsoft.SqlServer.Server.SqlDataRecord is listed nowhere in the mono docs, I guess it isn't implemented.
Activity
mgravell commentedon Dec 18, 2015
K, that's fun. I will see if we can wrap that in some hackery to dodge
around that. Should have something in the next few days.
On 18 Dec 2015 23:20, "Sebastian Klose" [email protected] wrote:
mgravell commentedon Dec 19, 2015
Please can I ask you to verify via 1.50.0-beta6 (available on nuget)?
sklose commentedon Dec 19, 2015
It's working for me, thanks for the quick fix!
mgravell commentedon Dec 19, 2015
@sklose thanks for a clear bug report that let me understand exactly what the problem was and what needed changing ;p (sadly, they're not always so clear)
NilufarMakhmudova commentedon Aug 3, 2018
@mgravell, we are experiencing a similar problem with our Xamarin Android solution with SQLite database, where Dapper 1.50.5 NuGet package is installed.
System.TypeInitializationException: The type initializer for 'Dapper.SqlMapper' threw an exception. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Dapper.SqlMapper.AddTypeHandlerImpl (System.Type type, Dapper.SqlMapper+ITypeHandler handler, System.Boolean clone)
at Dapper.SqlMapper.ResetTypeHandlers (System.Boolean clone)
at Dapper.SqlMapper..cctor ()
Are there any clues on how to fix it?
Be more defensive when adding SqlDataRecord handler; fix DapperLib#424