Visual Studio 2017 update issue: Unable to load DLL ‘sqlite3’: The specified module could not be found. (Exception from HRESULT: 0x8007007E)

Question

While upgrading vs2015 .net standard to vs2017, I got the following error in test project.

Unable to load DLL ‘sqlite3’: The specified module could not be found. (Exception from HRESULT: 0x8007007E)

It works well with vs2015, sqlite provider 1.0.101.0

New Environment: Visual Studio 2017, TargetFramework="net461" using .netcore1.1 packages, sqlite provider 1.0.105.0

I have tried all resolutions I can get from internet as following, but all in vain. I've tried,

Added below lines to .csproj, <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType><AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
Selected testing processor as x86
Installed provider: sqlite-netFx46-static-binary-bundle-Win32-2015-1.0.105.0.zip from http://system.data.sqlite.org
Installed System.Data.SQLite 1.0.105 nuget package
Tried put sqlite3.dll (x86) to project folder, set it as "Content" and "copy always", even tried copying the file to bin/x86/, it complains a new error

An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)

at Microsoft.Data.Sqlite.Interop.NativeMethods.Sqlite3_sqlite3.sqlite3_open_v2(IntPtr filename, Sqlite3Handle& ppDb, Int32 flags, IntPtr vfs)
   at Microsoft.Data.Sqlite.Interop.NativeMethods.Sqlite3_sqlite3.open_v2(IntPtr filename, Sqlite3Handle& ppDb, Int32 flags, IntPtr vfs)
   at Microsoft.Data.Sqlite.Interop.NativeMethods.sqlite3_open_v2(String filename, Sqlite3Handle& ppDb, Int32 flags, String vfs)
   at Microsoft.Data.Sqlite.SqliteConnection.Open()
   at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open()
   at Microsoft.EntityFrameworkCore.Storage.Internal.SqliteRelationalConnection.Open()
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable.Enumerator.BufferlessMoveNext(Boolean buffer)
   at Microsoft.EntityFrameworkCore.Storage.Internal.NoopExecutionStrategy.Execute[TState,TResult](Func`2 operation, Func`2 verifySucceeded, TState state)
   at Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.Execute[TState,TResult](IExecutionStrategy strategy, Func`2 operation, TState state)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable.Enumerator.MoveNext()
   at Microsoft.EntityFrameworkCore.Query.QueryMethodProvider.<_ShapedQuery>d__3`1.MoveNext()
   at Microsoft.EntityFrameworkCore.Query.QueryMethodProvider.<_Include>d__30`1.MoveNext()
   at Microsoft.EntityFrameworkCore.Query.QueryMethodProvider.<_Include>d__30`1.MoveNext()
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.<_TrackEntities>d__15`2.MoveNext()
   at Microsoft.EntityFrameworkCore.Query.Internal.LinqOperatorProvider.ExceptionInterceptor`1.EnumeratorExceptionInterceptor.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at

Downloaded C++ Runtime for 2017
Installed extension of "SQLite runtime for windows"

All doesn't help. Anything I missed?

Elaine Elaine · Accepted Answer · 2017-04-14T08:53:35

Solved by a walk-around.

I tried POC in visual studio 2017, with a net461 project and a unit testing project, net461 project works well with sqlite, yet unit testing project needs referencing sqlite package,

Yet, the sqlite package doesn't work well with net461 class library project, no dll is extacted to bin/x86 or bin/x64 folder

The walk-around is adding x86/sqlite3.dll, x64/sqlite3.dll to project as "Content" and "Copy it Newer" (otherwise, it could be being used, and cause error) as below

System.Data.SQLite, is not really needed here.

Now it works. Hope sqlite package will be compatible soon with visual studio 2017

Visual Studio 2017 update issue: Unable to load DLL ‘sqlite3’: The specified module could not be found. (Exception from HRESULT: 0x8007007E)

1 Answers