Could not load file or assembly 'Microsoft.WindowsAzure.Storage' Azure Functions

Question

I am currently working with a Azure Function created in visual studio. It is a timer function that calls some common code to write to a queue.

Running the code locally does not cause any issues. Runs just fine but when publish it I get the following error:

Could not load file or assembly 'Microsoft.WindowsAzure.Storage, Version=9.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.||System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.WindowsAzure.Storage, Version=9.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. File name: 'Microsoft.WindowsAzure.Storage, Version=9.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' at Esperanto.Core.Function.JobGetterLogic.SendJobsToQue() at JobGetter.TimedJob.Run(TimerInfo myTimer, TraceWriter log)

Here is my webjob code:

public static class TimedJob
{
    [FunctionName("TimedJob")]
    public static void Run([TimerTrigger("0 */1 * * * *")]TimerInfo myTimer, TraceWriter log)
    {
        log.Info($"C# Timer trigger function executed at: {DateTime.Now}");
        try
        {
            var brain = new CoreLogic.Function.JobGetterLogic();
            var result = brain.SendJobsToQue();
        }
        catch (Exception e)
        {
            log.Info(e.Message + "||" + e.ToString());
        }

    }
}

The system cannot find the file specified , check for the dll and see if it exists in correct/desired directory — Christopher H.
@zackraiyan I have tried to add the nuget package for Azure Storage to the Function but it wont add it. I also read that azure storage is just part of the azure functions system. — Dan

Mikhail Shilkov Mikhail Shilkov · Accepted Answer · 2018-03-31T19:52:04

Assuming you are on v1 of Azure Functions runtime (current production version), it uses WindowsAzure.Storage assembly of version 7.2.1. Since it's the runtime which controls which versions are loaded, your implementation has to comply and use the same version.

To fix the problem, change all your references to WindowsAzure.Storage (including transitive ones) to 7.2.1.

There's currently nothing like binding redirect supported by Azure Functions.

Could not load file or assembly 'Microsoft.WindowsAzure.Storage' Azure Functions

2 Answers