无法加载文件或程序集

Question

I'm working on a system to use a SqlServerCe with NHibernate . From my driver program, if I add the System.Data.SqlServerCe assembly as a reference, I can create and run queries against a database just fine. When trying to use NHibernate , though, I get the following exception:

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll Additional information: Could not load file or assembly 'System.Data.SqlServerCe' or one of its dependencies. The system cannot find the file specified.

I've traced the exception to a call to Assembly.Load("System.Data.SqlServerCe") , which seems like it should work. The System.Data.SqlServerCe assembly is in the GAC (I've also tried to add it as a local reference with CopyLocal=true , to no avail), and I can use its members fine, so why can't I explicitly load it? When I open the assembly in Reflector, it has trouble loading the System.Transactions reference (I've also tried adding it as a local reference, again to no avail), so loading that assembly might be the problem, rather than the System.Data.SqlServerCe assembly .

Is this a common problem? System misconfiguration, maybe?

Answer 1

Apparently this can be solved by adding a <qualifyAssembly> element to the app.config file. Adding the following has my app running smoothly:

<runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
        <qualifyAssembly partialName="System.Data.SqlServerCe" fullName="System.Data.SqlServerCe, Version=3.5.1.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
    </assemblyBinding>
</runtime>

Thanks!

Answer 2

This is most probably connected to some system (mis)configuration.

However, by design SQL Server CE is just a single DLL, which may be shipped together with your product.
This means that you can just set Copy local to True in the reference properties of System.Data.SqlServerCe , and you are done.

Answer 3

I had a similar problem. The mistake I was doing was I was trying to execute the .exe present in the ../obj/x86/Release, whereas I am supposed to execute the .exe present in ../bin/Release. (I am absolute newbie to C#).

(I also noticed that in this ../bin/Release directory , the referenced .dll file is copied locally.)