Improve comments in SampleHost to be explicit about what connection strings are required to run it as-is

[grahamehorner]

SampleHost fails to run

Repro steps

Provide the steps required to reproduce the problem

1. set SampleHost as startup
2. run SampleHost

Expected behavior

should successfully run

Actual behavior

exceptions

> fail: Host.Startup[0]
>       Error indexing method 'Functions.ProcessEvents'
> Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexingException: Error indexing method 'Functions.ProcessEvents' ---> System.ArgumentNullException: Value cannot be null.
> Parameter name: receiverConnectionString
>    at Microsoft.Azure.WebJobs.EventHubs.EventHubOptions.AddReceiver(String eventHubName, String receiverConnectionString) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Extensions.EventHubs\Config\EventHubOptions.cs:line 163
>    at Microsoft.Azure.WebJobs.EventHubs.EventHubTriggerAttributeBindingProvider.TryCreateAsync(TriggerBindingProviderContext context) in C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Extensions.EventHubs\Triggers\EventHubTriggerAttributeBindingProvider.cs:line 66
>    at Microsoft.Azure.WebJobs.Host.Triggers.CompositeTriggerBindingProvider.TryCreateAsync(TriggerBindingProviderContext context) in C:\Users\GrahameHorner\source\repos\azure-webjobs-sdk\src\Microsoft.Azure.WebJobs.Host\Triggers\CompositeTriggerBindingProvider.cs:line 22
>    at Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexer.IndexMethodAsyncCore(MethodInfo method, IFunctionIndexCollector index, CancellationToken cancellationToken) in C:\Users\GrahameHorner\source\repos\azure-webjobs-sdk\src\Microsoft.Azure.WebJobs.Host\Indexers\FunctionIndexer.cs:line 160
>    at Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexer.IndexMethodAsync(MethodInfo method, IFunctionIndexCollector index, CancellationToken cancellationToken) in C:\Users\GrahameHorner\source\repos\azure-webjobs-sdk\src\Microsoft.Azure.WebJobs.Host\Indexers\FunctionIndexer.cs:line 137
>    --- End of inner exception stack trace ---
>    at Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexer.IndexMethodAsync(MethodInfo method, IFunctionIndexCollector index, CancellationToken cancellationToken) in C:\Users\GrahameHorner\source\repos\azure-webjobs-sdk\src\Microsoft.Azure.WebJobs.Host\Indexers\FunctionIndexer.cs:line 145
>    at Microsoft.Azure.WebJobs.Host.Indexers.FunctionIndexer.IndexTypeAsync(Type type, IFunctionIndexCollector index, CancellationToken cancellationToken) in C:\Users\GrahameHorner\source\repos\azure-webjobs-sdk\src\Microsoft.Azure.WebJobs.Host\Indexers\FunctionIndexer.cs:line 73
> 

Known workarounds

Related information

[brettsam]

You need to have the service bus connection string set up (or you can just remove .AddServiceBus())-- I'm going to repurpose this issue to "beef up the sample comments". I agree we should be explicit about what's required to get this to run.