C # Dapper and FastMember - the specified method is not supported

Question

I have a C # .NET Core 2.0 web API project (implemented as a microservice).

I use the NuGet "Dapper" and "FastMember" packages (the latest versions) at my repository level to try to convert IEnumerable<T>to a DataTable using the ObjectReader that FastMember provides so that I can use the built-in Dapper - in ICustomQueryParameter SqlMapper pass the table parameter to the stored procedure. which I use in SQL Server.

When I run and debug your code, it throws an exception in the line where FastMember ObjectReader tries to load in a DataTable: table.Load(reader);.

Here is my Dapper wrapper / extension method that contains the problem string:

public static class DapperExtensions
{
    public static SqlMapper.ICustomQueryParameter AsTvp<T>(this 
    IEnumerable<T> enumerable, string typeName) where T : class
        {
            var table = new DataTable();
            var members = typeof(T).GetProperties().Select(p => p.Name).ToArray();
            using (var reader = ObjectReader.Create(enumerable.ToList(), members))
            {
                table.Load(reader);
            }
            return table.AsTableValuedParameter(typeName);
        }
}

Dapper, :

using (var dbConnection = new SqlConnection(_connectionString))
{
    var result = dbConnection.Query("[PurchaseOrders].[Add] @tvpNewPurchaseOrderItems, @StartDate", new
    {
        tvpNewPurchaseOrderItems = purchaseOrderCreationRequest.PurchaseOrderItems.AsTvp("NewPurchaseOrderType"),
    StartDate = purchaseOrderCreationRequest.StartDate
    });
}

#, :

at System.Data.Common.DbDataReader.GetSchemaTable()
at System.Data.ProviderBase.SchemaMapping..ctor(DataAdapter adapter, DataSet dataset, DataTable datatable, DataReaderContainer dataReader, Boolean keyInfo, SchemaType schemaType, String sourceTableName, Boolean gettingData, DataColumn parentChapterColumn, Object parentChapterValue)
at System.Data.Common.DataAdapter.FillMappingInternal(DataSet dataset, DataTable datatable, String srcTable, DataReaderContainer dataReader, Int32 schemaCount, DataColumn parentChapterColumn, Object parentChapterValue)
at System.Data.Common.DataAdapter.FillMapping(DataSet dataset, DataTable datatable, String srcTable, DataReaderContainer dataReader, Int32 schemaCount, DataColumn parentChapterColumn, Object parentChapterValue)
at System.Data.Common.DataAdapter.FillFromReader(DataSet dataset, DataTable datatable, String srcTable, DataReaderContainer dataReader, Int32 startRecord, Int32 maxRecords, DataColumn parentChapterColumn, Object parentChapterValue)
at System.Data.Common.DataAdapter.Fill(DataTable[] dataTables, IDataReader dataReader, Int32 startRecord, Int32 maxRecords)
at System.Data.DataTable.Load(IDataReader reader, LoadOption loadOption, FillErrorEventHandler errorHandler)
at System.Data.DataTable.Load(IDataReader reader)
at PurchaseOrderCreationRepositories.Extensions.DapperExtensions.AsTvp[T](IEnumerable`1 enumerable, String typeName) in C:\Projects-Git\Enterprise\PurchaseOrderCreationService\PurchaseOrderCreationRepositories\Extensions\DapperExtensions.cs:line 16
at PurchaseOrderCreationRepositories.PurchaseOrderRepository.Add(IPurchaseOrderCreationRequest purchaseOrderCreationRequest) in C:\Projects-Git\Enterprise\PurchaseOrderCreationService\PurchaseOrderCreationRepositories\PurchaseOrderRepository.cs:line 22
at PurchaseOrderCreationServices.PurchaseOrderService.Add(IPurchaseOrderCreationRequest purchaseOrderCreationRequest) in C:\Projects-Git\Enterprise\PurchaseOrderCreationService\PurchaseOrderCreationServices\PurchaseOrderService.cs:line 18
at PurchaseOrderCreationServiceApi.Controllers.PurchaseOrderCreationController.Add(PurchaseOrderCreationRequest purchaseOrderCreationRequest) in C:\Projects-Git\Enterprise\PurchaseOrderCreationService\PurchaseOrderCreationServiceApi\Controllers\PurchaseOrderCreationController.cs:line 25

: Specified method is not supported.

- ?? , .NET Core 2.0 . FastMember .NET Core 2.0 SqlBulkCopy. , Dapper.

! .

Answer 1

FastMember. , ,.NET Core API ADO.NET API, , .

.NET Core, FastMember, API. .

, FastMember :

#if !COREFX
    public override DataTable GetSchemaTable()
    {...}
#endif

: override , .

---

v1.2.0 , netstandard2.0