最新的SQLite版本错误

Question

Having just updated my SQLite dll via Nuget to v1.0.81.0, I am getting errors like the one below. This happens AFTER first executing successfully one or more times (not sure). The environment is vs2010 on an x64 machine but with build setting targeting x86.

I use SQLite to unit test my NHibernate mappings. Having frequently found SQLite a bit "cranky" in the past, I am reluctant to mess with a working unit test fixture (see below)

Anybody have a clue what is going wrong here?

Cheers,
Berryl

Error Msg

Unable to copy file "...\x86\SQLite.Interop.dll" to "bin\Debug\x86\SQLite.Interop.dll". The process cannot access the file 'bin\Debug\x86\SQLite.Interop.dll' because it is being used by another process. Parties.Data.Impl.NHib.Tests

Unit Test Fixture (enough to show file access anyway)

public abstract class SQLiteTestFixture
{

    protected override void BeforeAllTests()
    {
        _configureDbFile();
        base.BeforeAllTests();
    }

    protected override void AfterAllTests()
    {
        base.AfterAllTests();

        _deleteAllDbFiles();
    }

    #region Db File Maintenance

    /// <summary>
    /// Using a file is likely slower than just memory but not noticeably so far,
    /// AND seems to be a bit more stable
    /// </summary>
    private const string DB_FILE_SUFFIX = ".Test.db";

    /// <summary>
    /// Just make some random file name with a known suffix, so we can clean up when done.
    /// </summary>
    private void _configureDbFile()
    {
        _dbFile = Path.GetFullPath(Guid.NewGuid().ToString("N") + DB_FILE_SUFFIX);

        // highly unlikely but just in case the same file is already out there
        _deleteDbFile();
    }

    private void _deleteDbFile()
    {
        if (File.Exists(_dbFile)) File.Delete(_dbFile);
    }

    private static void _deleteAllDbFiles()
    {
        var files = Directory.GetFiles(Directory.GetCurrentDirectory(), "*" + DB_FILE_SUFFIX);
        foreach (var file in files)
        {
            File.Delete(file);
        }
    }

    private string _dbFile;

    #endregion

}

}

Answer 1

I was having this problem with SQLite 1.0.88.0 with VS2010 and TestDriven.Net. I tried answers on several SO questions but the only thing that worked for me was this:

1. Tools -> Options -> TestDriven.Net -> General
2. Under Run Test(s) , Uncheck "Cache tests process between test runs"
3. Restart Visual Studio

You should now be able to run tests, debug tests, rebuild, etc. without having to restart processes or Visual Studio.

Answer 2

KB article describing one possible cause

• http://support.microsoft.com/kb/313512/en-us

most of the following solve the problem temporarily

• restart Visual Studio
• http://aspadvice.com/blogs/ssmith/archive/2005/03/21/1849.aspx
• close casini webserver

Answer 3

Change the SQLLite dlls "Copy to Output Directory" to "Copy if newer" does the trick. (You migth need to restart VS after changing the property)