Azure functions development and configuration with Azure SignalR Service throws an error message on connection string

Question

Here it is the code of the function which is pretty much straight forward:

[FunctionName("negotiate")]
        public static SignalRConnectionInfo Run(
            [HttpTrigger(AuthorizationLevel.Anonymous)]
            HttpRequest req,
            [SignalRConnectionInfo(
            ConnectionStringSetting = "Endpoint=https://myowntestserver.service.signalr.net;AccessKey=mymaskedaccesskey=;Version=1.0;",
            HubName = "tracking")]
            SignalRConnectionInfo connectionInfo)
        {            
            return connectionInfo;
        }

When running this code on Visual Studio 2017, I get the following error message:

[2019-03-27 3:39:14 PM] Error indexing method 'negotiate'

[2019-03-27 3:39:14 PM] Microsoft.Azure.WebJobs.Host: Error indexing method 'negotiate'. Microsoft.Azure.WebJobs.Host: Unable to resolve the value for property 'SignalRConnectionInfoAttribute.ConnectionStringSetting'. Make sure the setting exists and has a valid value.

local.settings.json file looks like this:

{
    "IsEncrypted": false,
    "Values": {
        "AzureWebJobsStorage": "UseDevelopmentStorage=true",
        "FUNCTIONS_WORKER_RUNTIME": "dotnet"
    }
}

And here it is the host.json file:

{
    "version": "2.0"
}

The project file contains the following nuget packages:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp2.2</TargetFramework>
    <AzureFunctionsVersion>v2</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.ServiceBus" Version="3.0.3" />
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.SignalRService" Version="1.0.0" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.26" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
</Project>

With all these configurations in place which seem right, not sure why we should get the error message that I quoted above.

score 1 · Accepted Answer · answered Mar 27 '19 at 19:05

The issue is resolved by updating local.settings.json file per the following example:

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "AzureWebJobsDashboard": "UseDevelopmentStorage=true",
    "AzureSignalRConnectionString": "Endpoint=Endpoint=https://myowntestserver.service.signalr.net;AccessKey=mymaskedaccesskey=;Version=1.0;""
  },
  "Host": {
    "LocalHttpPort": 7071,
    "CORS": "*"
  }
}

Also, SignalRConnectionInfo.ConnectionStringSetting should be removed from the attribute.

Azure functions development and configuration with Azure SignalR Service throws an error message on connection string

1 Answers1