Unable to user Memory Cache with Azure Function App

Question

I have created Azure Function App with Http trigger in that I want to use memory cache from system.runtime namespace to cache the token. but when I run the application its throwing the error " System.Runtime.Caching: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=5.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified."

I have made sure the exact version is installed in the project. here is the csproj file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <AzureFunctionsVersion>v3</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="3.0.11" />
    <PackageReference Include="System.Configuration.ConfigurationManager" Version="5.0.0" />
    <PackageReference Include="System.Runtime.Caching" Version="5.0.0" />
  </ItemGroup>
  <ItemGroup>

Here is the bare minimum version of the code where I am facing the issue.

public static class Function1
    {
        public static MemoryCache accessTokenCache = new MemoryCache("accessToken");
        [FunctionName("Function1")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            accessTokenCache.Add("123", "123", new CacheItemPolicy() { Priority = CacheItemPriority.Default });

            return new OkObjectResult("");
        }
    }

above code works fine with system.runtime.caching nuget with version 4.7.0. I have downgraded for now to get it work. — threeleggedrabbit, Mar 20 '21 at 09:45
Hi, since you have found the workaround, could you please post an answer in below area for other communities reference ? — Hury Shen, Mar 29 '21 at 07:22
Why using this System.Runtime instead of the new Microsoft.Extensions.Caching.Memory ? — Leszek P, Feb 01 '22 at 09:38

score 3 · Accepted Answer · answered Mar 30 '21 at 07:00

3

above code works fine with system.runtime.caching nuget with version 4.7.0. I have downgraded for now to get it work.

I have also posted the issue in github for further follow up. https://github.com/Azure/Azure-Functions/issues/1867

answered Mar 30 '21 at 07:00

threeleggedrabbit

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Using ver 4.7.0 of that nuget works, but latest version of that Nuget gives same error. Have you found any other workaround rather than using the old 4.7 version ? – Anand Sowmithiran Apr 27 '22 at 06:53
have you checked this ? Microsoft.Extensions.Caching.Memory – threeleggedrabbit Jun 01 '22 at 07:07

Unable to user Memory Cache with Azure Function App

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