Library does not work on Xamarin.iOS

[AlexanderPBrown]

Use of FastMember does not allow deployment to Xamarin.iOS prod builds. For some reason it works in the emulator and when in Debug mode for me, but the Staging builds yield a runtime error.

FastMember library mentions that it does not support AOT environments like Xamarin.iOS. Is it possible to detect these environments and avoid using this library in these cases? Alternatively, some documentation clarifying that these libraries cannot be used on Xamarin.iOS so that people don't waste their time and find out in staging test environment?

• Alex P. Brown

Stack Trace:
Inner Exception: 
System.PlatformNotSupportedException:Operation is not supported on this platform.
Stack Trace:  at FastMember.TypeAccessor.CreateNew (System.Type type, System.Boolean allowNonPublicAccessors) <0x106cd1370 + 0x00890> in <798736fc01fd469ca61008d61c3c942a#c98189853e6325ad5bb6252eaaf8d71d>:0 
  at FastMember.TypeAccessor.Create (System.Type type, System.Boolean allowNonPublicAccessors) <0x106ccfc40 + 0x00153> in <798736fc01fd469ca61008d61c3c942a#c98189853e6325ad5bb6252eaaf8d71d>:0 
  at EFCore.BulkExtensions.SqlBulkOperation.MergeAsync[T] (Microsoft.EntityFrameworkCore.DbContext context, System.Collections.Generic.IList`1[T] entities, EFCore.BulkExtensions.TableInfo tableInfo, EFCore.BulkExtensions.OperationType operationType, System.Action`1[T] progress, System.Threading.CancellationToken cancellationToken) <0x106c7d360 + 0x0270b> in <e45217439afa41d8804137c627dc3352#c98189853e6325ad5bb6252eaaf8d71d>:0 
  at SHISessionScanner.Core.Services.CventEventSyncService.bulkEventDetailsDbSync (System.Guid eventGuid, SHISessionScanner.Model.CventEvent eventDetails) <0x1068066c0 + 0x00777> in <284699bca45b4d6e9f01c9b88ffb8c45#c98189853e6325ad5bb6252eaaf8d71d>:0 
  at SHISessionScanner.Core.Services.CventEventSyncService.syncDownloadWithDatabase (System.Guid eventGuid, SHISessionScanner.Model.CventEvent eventDetails) <0x106805d00 + 0x0033b> in <284699bca45b4d6e9f01c9b88ffb8c45#c98189853e6325ad5bb6252eaaf8d71d>:0 

[borisdj]

FastMember library is not necessary, there are situations where it is not used, for example with OwnedTypes DataTable is used instead of library FastMember since it does not work in that case.
So this would be similar situation and usage of FM library can be configured in BulkConfig with property UseOnlyDataTable.

EFCore.BulkExtensions/EFCore.BulkExtensions/SqlBulkOperation.cs

Lines 58 to 63 in 81aaa92

	bool useFastMember = tableInfo.HasOwnedTypes == false // With OwnedTypes DataTable is used since library FastMember can not (https://github.com/mgravell/fast-member/issues/21)
	&& tableInfo.ColumnNameContainsSquareBracket == false // FastMember does not support escaped columnNames ] -> ]]
	&& tableInfo.ShadowProperties.Count == 0 // With Shadow prop. Discriminator (TPH inheritance) also not used because FastMember is slow for Update (https://github.com/borisdj/EFCore.BulkExtensions/pull/17)
	&& !tableInfo.ConvertibleProperties.Any() // With ConvertibleProperties FastMember is slow as well
	&& !tableInfo.HasAbstractList // AbstractList not working with FastMember
	&& !tableInfo.BulkConfig.UseOnlyDataTable;

[borisdj]

I have added Remark about it in the ReadMe.

[MartinLeist]

On Xamarin.iOS one usually uses SQLite. The SQLite path uses FastMember no matter what. The way without fastmember is only included on SQL Server. So the cominbation Xamarin.iOS and SQLite does not work.

[borisdj]

FastMember dependency is now removed.
Version 3.2.0+