Saya memiliki bug yang sama dan saya telah diperbaiki seperti ini:Anda perlu mengubah web.config Anda seperti ini:
<entityFramework>
<defaultConnectionFactory type="Oracle.ManagedDataAccess.EntityFramework.OracleConnectionFactory, Oracle.ManagedDataAccess.EntityFramework"></defaultConnectionFactory>
<providers>
<provider invariantName="Oracle.ManagedDataAccess.Client" type="Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices, Oracle.ManagedDataAccess.EntityFramework, Version=6.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
Dan Anda perlu menginstal entityFramework1. Instal-Paket EntityFramework -Versi 6.1.12. Tambahkan referensi dari penyiapan tautan Anda ODAC 12c Rilis 4Oracle.ManagedDataAccess.EntityFramework.dllOracle.ManagedDataAccess.dll ke proyek Anda. Selesai