Oracle Data Access Dll is not working

Question

I just reformatted my pc into Windows 7 64bits. I open my previous project (Always in ANY CPU) and run it, but I encountered this error

System.InvalidOperationException: Attempt to load Oracle client libraries threw BadImageFormatException. This problem will occur when running in 64 bit mode with the 32 bit Oracle client components installed. ---> System.BadImageFormatException: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)

I have already installed Oracle Client win64_11gR2_client and it is in 64bits. Any Idea how to solve this issue?

Answer 1

Oracle.ODP has unmanaged code and requires the owning process to match the 'bitness'.

You need to ensure that when compiling your program as AnyCPU, that it runs in a 64-bit environment to match your 64-bit driver's bitness. You can check your TaskManager to see if your program has a * 32 next to the process name (Means the app runs in a 32 bit context).

The bitness mismatch usually happens when you're trying to debug an application with Visual Studio on a x-64 OS.

You can solve it by installing the x86 driver of Oracle.ODP .

If you are sure that you only need to support x64 bit environment, compile with as x64 instead of AnyCPU.