Could not load file or assembly Microsoft.Bcl.AsyncInterfaces

Question

I can not use the SqlType provider due to an issue with Microsoft.Bcl.AsyncInterfaces.
I am using a minimal program with .NET 4.7.2 and F# 4.7.0.0. My Nuget packages contain a reference to:

package id="Microsoft.Bcl.AsyncInterfaces" version="1.0.0" targetFramework="net472"

Severity Code Description Project File Line Suppression State Error FS3033 The type provider 'FSharp.Data.Sql.SqlTypeProvider' reported an error: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information. Details: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. Das System kann die angegebene Datei nicht finden. TestSqlProvider C:\Users\weism\source\repos\TestSqlProvider\TestSqlProvider\Program.fs 9 Active

What can I do to fix this issue?

Answer 1

For me, installing the Microsoft.Bcl.AsyncInterfaces (Nuget package) fixed the issue.

Answer 2

This error also happens when you try using Microsoft.EntityFrameworkCore v5 in a dotnet core v3.1 project. To resolve, down-version Microsoft.EntityFrameworkCore to latest v3 version.

Answer 3

For .Net Core, This problem basically occur , when we use layered architecture. Just make sure the version of Microsoft.EntityFrameworkCore should be same in all project, wherever it is used.

Answer 4

I think you update package in one layer. for me i worked in project with three layers (api, AdminTool, Data) the AdminTool Layer had a reference to Data Layer i updated all packages in AdminTool only so i had this error i update package also in data layer and api layer so the problem solved. I hope that help you.

Answer 5

I don't use Microsoft.Bcl.AsyncInterfaces at all in my .NET 4.8 project. Some library depends on version 1.0.0.0. I resolved the issue using a binding redirect:

            <dependentAssembly>
                <assemblyIdentity name="Microsoft.Bcl.AsyncInterfaces" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
                <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
            </dependentAssembly>

Microsoft.Bcl.AsyncInterfaces.dll 5 was copied to Bin after build.

Answer 6

My Entity Framework Core just needed upgraded TO

Answer 7

Make sure you have unique single version of that dll. Another step would be to add a binding redirect in the app.config as told in the above comments.

Answer 8

Check in your installed nuget packages--- If version of Microsoft.EntityFrameworkCore and your .net project is different then it can be a problem. Example - If EntityFrameworkCore is at v5.1.5 or higher & your project dotnet core v3.1 project, this can be the issue.

To solve,

1. down-version Microsoft.EntityFrameworkCore to equal version of project such as v3 version. to down version click on tool in visual studio -->Nuget Package Manager--> Manage Nuget package for Solutions --> click on installed ---> select nuget package which you want to downgrade --> click on uninstall and then select the same nuget package and then install version 3.1.5 or relevent package.

or

2. Install Microsoft.Bcl.AsyncInterfaces (Nuget package)