Oracle.DataAccess.dll提供程序和dll不兼容

Question

I have recently taken a position as an application developer and without much experience I am unable to determine the root of my problem. I have searched through the forums and have not be able to draw a conclusive answer to my specific problem, therefore I am asking a question. My apologies beforehand if I offend anyone or break any rules as I am new to this site.

I have several applications that require the use of oracle.dataaccess.dll. I have installed the oracle client x32 as requested by my employer. When I attempt to run any applications that require the oracle.dataaccess.dll file, I am met with varying errors.

Most application use the 4.xx.xx.xx version of the dll, which does not appear for my oracle client (I assume its because I installed the 32bit). When I attempt to use the 32 bit version I get various errors:

1. The provider is not compatible with the version of Oracle client

or

2. Could not load file or assembly. 'Oracle.DataAccess.dll' or one of its dependancies. An attempt was made to load a program w/ an incorrect format.

or

3. The provider may not be installed.

If I attempt to use the oracle.dataaccess.dll that is used on the production servers, I get the same errors.

1. What is the 'provider' and how can I figure out which one(s) I have installed?

2. Should I have any of these dlls stored in my GAC?

3. I have absolutely no idea where I need to go from here as I have tried everything that I know. I even uninstalled my Oracle Client and reinstalled to no avail. Please, any information that would point me towards a good tutorial or how to use oracle.dataaccess would be much appreciated.

Again I apologize beforehand for any trouble.

Answer 1

Some generic points:

• ODP.NET (ie Oracle.DataAccess.dll ) requires an Oracle Client installation. The stand-alone DLL does not work.
• The architecture (ie 32 vs. 64 bit) of Oracle.DataAccess.dll must match the architecture of the installed Oracle Client and the architecture of your application.
• The version (eg 2.x or 4.x of Oracle.DataAccess.dll ) must match the .NET compile target of your application. If you compile on target 2.0, 3.0 or 3.5 you must install version 2.x . For compile target 4 or above you must install version 4.x
• The version (eg x.111 , x.112 , x.121 , etc.) should match the version of installed Oracle Client.

Regarding your questions:

The provider is the DLL Oracle.DataAccess.dll . It can be a local copy in your application binary folder or installed in GAC.

It does not matter whether you use the GAC or not. Personally I prefer to use the GAC but you can also provide a local copy.

You can interrogate the installed providers with gacutil.exe tool:

C:\>gacutil /l Oracle.DataAccess
Microsoft (R) .NET Global Assembly Cache Utility.  Version 4.0.30319.18020
Copyright (c) Microsoft Corporation.  All rights reserved.

The Global Assembly Cache contains the following assemblies:
  Oracle.DataAccess, Version=2.112.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=AMD64
  Oracle.DataAccess, Version=2.112.4.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=AMD64
  Oracle.DataAccess, Version=2.112.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=x86
  Oracle.DataAccess, Version=2.112.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=x86
  Oracle.DataAccess, Version=2.112.4.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=x86
  Oracle.DataAccess, Version=4.112.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=AMD64
  Oracle.DataAccess, Version=4.112.4.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=AMD64
  Oracle.DataAccess, Version=4.112.4.0, Culture=neutral, PublicKeyToken=89b483f429c47342, processorArchitecture=x86

Number of items = 8

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