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Using LINQPad with EF Core DbContext / custom DLL assembly

KozzerKozzer
We have a .Net Framework-targeting DLL which contains the EF Core (v2.2) DbContext and related classes. I'd like to see how useful LINQPad would be for my team as a development tool, but I'm having trouble having it use our DLL.

I have successfully added the EF7/EF Core 2.2 driver in LINQPad, but when I try to create a new connection and set the path to the custom assembly DLL (which is in the same folder as the dll.config and pdb), it gives me this error: "Cannot load assembly: Absolute path information is required". The DLL and related files are on my C: drive, and googling has failed me so far.

For reference, I do have a parameterless constructor for my DbContext, but that doesn't seem to make a difference. I get the error after I browse to and select the DLL (the first input box of the add connection form).

So I'm hoping that someone here can help me - or at least tell me that I'm tilting at windmills because what I want to do isn't supported.

Thanks!
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Comments

  • KozzerKozzer
    Bumping this, since I posted this I've played around with LINQPad and it's really great, but I cannot justify the cost for the enterprise version if we can't get it to talk to our database via the EF Core ORM. Any help or insight would be appreciated!
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  • JoeAlbahariJoeAlbahari
    Can you please download the latest beta:
    https://www.linqpad.net/Download.aspx#beta

    After entering the path to the custom assembly, ignore the error and manually type in the full type name of your typed data context (including the namespace).

    Then click 'Test'. If a similar error is reported, go to %localappdata%\linqpad\logs and tell me what's in the log file. (The new beta records more information here.)
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  • KozzerKozzer
    Thank you for your response! I have installed the beta and performed the steps, and it did still fail, and here's what's in the log file:

    5.36.03 2019-02-14T11:13:20.9408372-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_epfntrfl\TypedDataContext_idmxnb.dll in finalizer

    5.36.03 2019-02-14T11:13:20.9438351-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_epfntrfl\query_zvfhvn.dll in finalizer

    5.36.03 2019-02-14T11:13:20.9468472-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_epfntrfl\query_zvfhvn.pdb in finalizer

    5.36.03 2019-02-14T11:13:20.9508439-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_epfntrfl\query_qwmjqk.dll in finalizer

    5.36.03 2019-02-14T12:57:16.7498461-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:57:16.7678235-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:57:16.7688226-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:57:16.7738928-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:57:16.7758914-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:57:16.7818860-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:57:16.7828815-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:57:16.7878818-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:57:16.7898993-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:57:16.7947123-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:59:43.8205651-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    [[continued below]]
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  • KozzerKozzer
    5.36.03 2019-02-14T12:59:43.8485582-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:59:43.8495576-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:59:43.8568951-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:59:43.8588927-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:59:43.8642920-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:59:43.8652904-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:59:43.8722934-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:59:43.8741348-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T12:59:43.8791316-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T13:02:18.9130431-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T13:02:18.9441348-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T13:02:18.9451346-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T13:02:18.9532589-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    [[continued below]]
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  • KozzerKozzer
    5.36.03 2019-02-14T13:02:18.9542599-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T13:02:18.9612562-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T13:02:18.9632544-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T13:02:18.9692512-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T13:02:18.9712494-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T13:02:18.9766468-06:00 SymbolManager -
    COMException: Error HRESULT E_FAIL has been returned from a call to a COM component.
    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
    at System.Diagnostics.SymbolStore.SymReader.GetMethod(SymbolToken method)
    at LINQPad.Reflection.Internal.LocalVariableNameReader..ctor(MethodBase m)
    at LINQPad.Reflection.Disassembler..ctor(MethodBase method, ILStyler styler)
    First chance data:

    5.36.03 2019-02-14T15:53:41.6513320-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_rtcjjwhw\TypedDataContext_idmxnb.dll in finalizer

    5.36.03 2019-02-14T15:53:41.7044731-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_rtcjjwhw\query_ftusdq.dll in finalizer

    5.36.03 2019-02-14T15:53:41.7123251-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_rtcjjwhw\query_blmoan.dll in finalizer

    5.36.03 2019-02-14T15:53:41.7313081-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_rtcjjwhw\query_nbxrbc.dll in finalizer

    5.36.03 2019-02-14T15:53:41.7372860-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_rtcjjwhw\query_drrufr.dll in finalizer

    5.36.03 2019-02-14T15:53:41.7492795-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_rtcjjwhw\query_nemvyq.dll in finalizer

    5.36.03 2019-02-14T15:53:41.7552757-06:00 Unable to delete file C:\Users\Kozzer\AppData\Local\Temp\LINQPad5\_rtcjjwhw\query_ttmugz.dll in finalizer

    [[continued below]]
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  • KozzerKozzer
    5.37.03(AnyCPU) 2019-02-21T07:49:35.9628903-06:00 Data context driver - TestProxy.Test -
    FileLoadException: Could not load file or assembly 'Microsoft.EntityFrameworkCore, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))
    at System.Reflection.RuntimeAssembly.GetType(RuntimeAssembly assembly, String name, Boolean throwOnError, Boolean ignoreCase, ObjectHandleOnStack type)
    at System.Reflection.RuntimeAssembly.GetType(String name, Boolean throwOnError, Boolean ignoreCase)
    at LINQPad.Extensibility.DataContext.DataContextDriver.TestProxy.TestStaticDriver(StaticDataContextDriver driver, Repository r)
    at LINQPad.Extensibility.DataContext.DataContextDriver.TestProxy.Test(Repository r)
    INNER: ArgumentExceptionAbsolute path information is required. at System.Security.Util.StringExpressionSet.CreateListFromExpressions(String[] str, Boolean needFullPath)
    at System.Security.Permissions.FileIOPermission.AddPathList(FileIOPermissionAccess access, AccessControlActions control, String[] pathListOrig, Boolean checkForDuplicates, Boolean needFullPath, Boolean copyPathList)
    at System.Security.Permissions.FileIOPermission..ctor(FileIOPermissionAccess access, String path)
    at System.Reflection.Assembly.LoadFile(String path)
    at LINQPad.Reflection.AppDomainCreator.<>c.<ResolveCustomAssemblies>b__30_0(Object sender, ResolveEventArgs args)
    at System.AppDomain.OnAssemblyResolveEvent(RuntimeAssembly assembly, String assemblyFullName)
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  • JoeAlbahariJoeAlbahari
    Could you try creating a new project from scratch in Visual Studio with a simple data context (one or two tables) and try with this? I need to figure out whether it's related to your machine or your data context. And if it still fails, could you try the same on another machine?
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  • KozzerKozzer
    Ok, I did exactly that, added just 3 tables (2 entity tables and a code table), used the same approach for instantiating via a parameterless constructor, same EF Core version 2.2, and even have the DLL on a network share rather than C: and it works perfectly!

    So that means something in my production DLL is causing trouble for LinqPad's integration. I suppose I could re-create my entire context in this new project, but any time the data model changes then I'd have to remember to change it in 2 places which isn't ideal.

    Is there anything you can point me toward to check my prod DLL so that it can work with LinqPad?
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  • JoeAlbahariJoeAlbahari
    It could be related to the way in which your assembly references Microsoft.EntityFrameworkCore, or its dependencies. Can you see any difference in this regard between the context that works and the one that does not?
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  • KozzerKozzer
    No - they both use the NuGet package EF 2.2.0, and they're both set the same way with regard to the DbContext class. But that's OK, as I've already expanded my test library to be the full data model and it's working great, so I think I'm satisfied. Thank you for working with me on this!
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