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c# - 具有两个不同版本的 ODAC 的 InvalidCastException

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InvalidCastException在运行时得到：

System.InvalidCastException：[A]Oracle.DataAccess.Client.OracleCommand 无法转换为 [B]Oracle.DataAccess.Client.OracleCommand。类型 A 源自 'Oracle.DataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342' 在位置 'C:\WINDOWS\Microsoft.Net\assembly\GAC_64\Oracle.DataAccess\v4 的上下文'Default'中.0_4.121.2.0__89b483f429c47342\Oracle.DataAccess.dll'。类型 B 源自 'Oracle.DataAccess, Version=4.122.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342' 在位置 'C:\code\Windows Application\bin\Debug\Oracle.DataAccess.dll' 的上下文'Default' .

如何指定应用程序应使用哪个 Oracle 版本？

标签： c#oraclegacodac

解决方案

请看一下：[A]Oracle.ManagedDataAccess.Client.OracleParameter cannot be cast to [B]Oracle.ManagedDataAccess.Client.OracleParameter

但是，我认为问题可能是其他问题。检查你的GAC，我的看起来像这样：

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>

如果您有一个应用程序要求，Oracle.DataAccess, Version=4.122.1.0那么 Windows 不知道从 GAC 加载哪个版本（因为它仅涵盖最多 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：

获取一个“旧”版本Oracle.DataAccess.dll（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——只需一个 DLL，不要安装任何额外的 Oracle 客户端。

参考这个旧的 DLL。发布者策略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，请参阅如何从 GAC 加载特定版本的程序集

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！

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，gacutil.exe如果您愿意，也可以使用。

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