Microsoft.Azure.WebJobs.Host: Exception binding parameter 'db'. Fbeltrao.AzureFunctionExtensions: Object reference not set to an instance of an object.

[ianpowell2017]

Hello,

I am struggling and hope you can help.

I have a WebFunction initiated by a QueueTrigger. When I add your nuget package to my Visual Studio 2017 project and add

[RedisDatabase(Connection = "%redis_connectionstring%")] IDatabase db,

and the connection setting in local.settings.json then when I run the webfunction then I get

[30/12/2018 15:52:24] System.Private.CoreLib: Exception while executing function: HttpRequestRedis. Microsoft.Azure.WebJobs.Host: Exception binding parameter 'db'. Fbeltrao.AzureFunctionExtensions: Object reference not set to an instance of an object.

My Webfunction looks like this

        [FunctionName("HttpRequestRedis")]
        public static async Task Run(
            [QueueTrigger(CloudQueues.TempRequestLoggingForRedis, Connection = "StorageAccount")]string myQueueItem,
            [RedisDatabase(Connection = "%redis_connectionstring%")] IDatabase db,
            ILogger log
           )
          {
          }

If I remove the following from the method signature

[RedisDatabase(Connection = "%redis_connectionstring%")] IDatabase db,

Then it works as expected. Please advise how I may proceed.

Thanks

Ian

[fbeltrao]

Hi @ianpowell2017,

Thanks for reporting the problem. I have identified it and applied a fix (currently running).
Please let me know if it works now (I have included an example here: https://github.com/fbeltrao/AzureFunctionExtensions/blob/master/samples/RedisSample/QueueTriggerWithRedisFunctions.cs)

Cheers

[fbeltrao]

Version 1.0.22 has the fix