EF链接Oracle在增删改查都没问题，执行事务时报dll异常

C#开发C/S程序EF链接Oracle在增删改查都没问题，执行事务时报dll异常
具体异常：
System.Data.Entity.Core.EntityException: 基础提供程序在 Open 上失败。 ---> System.TypeInitializationException: “OracleInternal.MTS.DTCPSPEManager”的类型初始值设定项引发异常。 ---> System.IO.FileNotFoundException: 未能加载文件或程序集“Oracle.ManagedDataAccessDTC, Version=4.122.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342”或它的某一个依赖项。系统找不到指定的文件。
   在 System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   在 System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   在 System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   在 System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection)
   在 System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
   在 System.Reflection.Assembly.Load(String assemblyString)
   在 OracleInternal.MTS.DTCPSPEManager..cctor()