Could not load file or assembly 'sapnco' or one of its dependencies. An attempt was made to load a program with an incorrect format

问题

I have got this error while I am using SAP .NET Connector 3.0 x64. I couldn't find any solution at stackoverflow, so I d like to share here for others who stuck at same problem like me.

回答1:

Run > Regedit

HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\1X.0\WebProjects   

Change Use64BitIISExpress from 0 to 1 Restart Visual Studio and IISExpress.

回答2:

In VS 2017 I was able to resolve this by setting the Bitness to "x64" for IIS Express in the server section under the project web properties. I imagine this is similar to making the Use64BitIISExpress Regedit change in one of the other answers.

回答3:

You Can try browsing/configured your service through IIS, and set appPool .Net 4.0. I hope this solve the sapnco dll issue.

回答4:

I had similar problem with x86

I set the Platform Target from "any" to "x86", in Project/Properties and fixed the problem.

回答5:

I had similar problem with VS 2017 and AnyCPU project option.

To fix the problem I disable Prefer 32-bit checkbox in project build properties.

来源：https://stackoverflow.com/questions/25887269/could-not-load-file-or-assembly-sapnco-or-one-of-its-dependencies-an-attempt