具有两个不同版本的 ODAC 的 InvalidCastException答案

【问题标题】：InvalidCastException with two difference versions of ODAC具有两个不同版本的 ODAC 的 InvalidCastException
【发布时间】：2019-02-27 16:44:58
【问题描述】：

我的机器上安装了 ODAC 12.1。源代码使用版本 12.2（更新）。

我在运行时收到InvalidCastException：

System.InvalidCastException： [A]Oracle.DataAccess.Client.OracleCommand 无法转换为 [B]Oracle.DataAccess.Client.OracleCommand。 A型起源于 'Oracle.DataAccess，版本=4.121.2.0，文化=中性， PublicKeyToken=89b483f429c47342' 在上下文“默认”位置 'C:\WINDOWS\Microsoft.Net\assembly\GAC_64\Oracle.DataAccess\v4.0_4.121.2.0__89b483f429c47342\Oracle.DataAccess.dll'。 B 型源自 'Oracle.DataAccess, Version=4.122.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342' 在上下文中位置的“默认” 'C:\代码\Windows 应用程序\bin\Debug\Oracle.DataAccess.dll'。

如何指定应用程序应使用哪个 Oracle 版本？

【问题讨论】：

标签： c# oracle gac odac

【解决方案1】：

请看这个：[A]Oracle.ManagedDataAccess.Client.OracleParameter cannot be cast to [B]Oracle.ManagedDataAccess.Client.OracleParameter

但是，我认为问题可能出在其他地方。检查你的GAC，我的是这样的：

c:\Temp>gacutil /l | findstr /i Oracle.DataAccess, | findstr Version=4.12 | sort
  Oracle.DataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=AMD64
  Oracle.DataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=x86
  Policy.4.112.Oracle.DataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=AMD64
  Policy.4.112.Oracle.DataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=x86
  Policy.4.121.Oracle.DataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=AMD64
  Policy.4.121.Oracle.DataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=x86

发布者政策文件Policy.4.121.Oracle.DataAccess.config是这个

<configuration>
   <runtime>
      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
        <dependentAssembly>
          <assemblyIdentity name="Oracle.DataAccess" publicKeyToken="89B483F429C47342"/>
            <bindingRedirect oldVersion="4.121.0.0-4.121.2.0" newVersion="4.121.2.0"/>
        </dependentAssembly>
      </assemblyBinding>
   </runtime>
</configuration>

如果您的应用程序要求Oracle.DataAccess, Version=4.122.1.0，那么 Windows 不知道要从 GAC 加载哪个版本（因为它仅涵盖最高 4.121.2.0），因此很可能它会将您复制的 DLL 加载到应用程序目录.然后你得到版本冲突。

解决方案 1：

获取Oracle.DataAccess.dll 的“旧”版本（甚至可能比 4.121.2.0 更早，但必须是 4.xxx）并将其复制到您的开发机器上 - 只需单个 DLL，不要安装任何额外的 Oracle客户。

请参考这个旧的 DLL。发布者政策将自动重定向到您机器上安装的版本 - 除非您强制使用特定版本，请参阅 How to load specific version of assembly from GAC

解决方案 2：

上面我写了“发布者策略将自动重定向......”，但这意味着发布者策略已正确安装！

当我上次安装 Oracle 12.2 客户端时，Oracle.DataAccess 没有放入 GAC，也没有添加发布者策略。这似乎是 Oracle Universal Installer 中的一个错误。您可以使用此脚本手动添加它们，选择您需要的版本和架构：

SETLOCAL

set Oracle_x64=c:\oracle\product\12.1\Client_x64\ODP.NET
set Oracle_x86=c:\oracle\product\12.1\Client_x86\ODP.NET

set OraProvCfg_x64=%Oracle_x64%\bin\4\OraProvCfg.exe
set OraProvCfg_x86=%Oracle_x86%\bin\4\OraProvCfg.exe


IF EXIST "%Oracle_x64%\managed\common\Oracle.ManagedDataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\managed\common\Oracle.ManagedDataAccess.dll
IF EXIST "%Oracle_x64%\managed\PublisherPolicy\4\Policy.4.121.Oracle.ManagedDataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\managed\PublisherPolicy\4\Policy.4.121.Oracle.ManagedDataAccess.dll
IF EXIST "%Oracle_x64%\managed\PublisherPolicy\4\Policy.4.122.Oracle.ManagedDataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\managed\PublisherPolicy\4\Policy.4.122.Oracle.ManagedDataAccess.dll

IF EXIST "%Oracle_x64%\bin\2.x\Oracle.DataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\bin\2.x\Oracle.DataAccess.dll
IF EXIST "%Oracle_x64%\PublisherPolicy\2.x\Policy.2.102.Oracle.DataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\PublisherPolicy\2.x\Policy.2.102.Oracle.DataAccess.dll
IF EXIST "%Oracle_x64%\PublisherPolicy\2.x\Policy.2.111.Oracle.DataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\PublisherPolicy\2.x\Policy.2.111.Oracle.DataAccess.dll
IF EXIST "%Oracle_x64%\PublisherPolicy\2.x\Policy.2.112.Oracle.DataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\PublisherPolicy\2.x\Policy.2.112.Oracle.DataAccess.dll
IF EXIST "%Oracle_x64%\PublisherPolicy\2.x\Policy.2.121.Oracle.DataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\PublisherPolicy\2.x\Policy.2.121.Oracle.DataAccess.dll
IF EXIST "%Oracle_x64%\PublisherPolicy\2.x\Policy.2.122.Oracle.DataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\PublisherPolicy\2.x\Policy.2.122.Oracle.DataAccess.dll

IF EXIST "%Oracle_x64%\bin\4\Oracle.DataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\bin\4\Oracle.DataAccess.dll
IF EXIST "%Oracle_x64%\PublisherPolicy\4\Policy.4.112.Oracle.DataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\PublisherPolicy\4\Policy.4.112.Oracle.DataAccess.dll
IF EXIST "%Oracle_x64%\PublisherPolicy\4\Policy.4.121.Oracle.DataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\PublisherPolicy\4\Policy.4.121.Oracle.DataAccess.dll
IF EXIST "%Oracle_x64%\PublisherPolicy\4\Policy.4.122.Oracle.DataAccess.dll" "%OraProvCfg_x64%" /action:gac /providerpath:%Oracle_x64%\PublisherPolicy\4\Policy.4.122.Oracle.DataAccess.dll

IF EXIST "%Oracle_x86%\bin\2.x\Oracle.DataAccess.dll" "%OraProvCfg_x86%" /action:gac /providerpath:%Oracle_x86%\bin\2.x\Oracle.DataAccess.dll
IF EXIST "%Oracle_x86%\PublisherPolicy\2.x\Policy.2.102.Oracle.DataAccess.dll" "%OraProvCfg_x86%" /action:gac /providerpath:%Oracle_x86%\PublisherPolicy\2.x\Policy.2.102.Oracle.DataAccess.dll
IF EXIST "%Oracle_x86%\PublisherPolicy\2.x\Policy.2.111.Oracle.DataAccess.dll" "%OraProvCfg_x86%" /action:gac /providerpath:%Oracle_x86%\PublisherPolicy\2.x\Policy.2.111.Oracle.DataAccess.dll
IF EXIST "%Oracle_x86%\PublisherPolicy\2.x\Policy.2.112.Oracle.DataAccess.dll" "%OraProvCfg_x86%" /action:gac /providerpath:%Oracle_x86%\PublisherPolicy\2.x\Policy.2.112.Oracle.DataAccess.dll
IF EXIST "%Oracle_x86%\PublisherPolicy\2.x\Policy.2.121.Oracle.DataAccess.dll" "%OraProvCfg_x86%" /action:gac /providerpath:%Oracle_x86%\PublisherPolicy\2.x\Policy.2.121.Oracle.DataAccess.dll
IF EXIST "%Oracle_x86%\PublisherPolicy\2.x\Policy.2.122.Oracle.DataAccess.dll" "%OraProvCfg_x86%" /action:gac /providerpath:%Oracle_x86%\PublisherPolicy\2.x\Policy.2.122.Oracle.DataAccess.dll

IF EXIST "%Oracle_x86%\bin\4\Oracle.DataAccess.dll" "%OraProvCfg_x86%" /action:gac /providerpath:%Oracle_x86%\bin\4\Oracle.DataAccess.dll
IF EXIST "%Oracle_x86%\PublisherPolicy\4\Policy.4.112.Oracle.DataAccess.dll" "%OraProvCfg_x86%" /action:gac /providerpath:%Oracle_x86%\PublisherPolicy\4\Policy.4.112.Oracle.DataAccess.dll
IF EXIST "%Oracle_x86%\PublisherPolicy\4\Policy.4.121.Oracle.DataAccess.dll" "%OraProvCfg_x86%" /action:gac /providerpath:%Oracle_x86%\PublisherPolicy\4\Policy.4.121.Oracle.DataAccess.dll
IF EXIST "%Oracle_x86%\PublisherPolicy\4\Policy.4.122.Oracle.DataAccess.dll" "%OraProvCfg_x86%" /action:gac /providerpath:%Oracle_x86%\PublisherPolicy\4\Policy.4.122.Oracle.DataAccess.dll

当然，如果您愿意，也可以使用gacutil.exe。

【讨论】：