CODEWITHSUNDEEP
c#azureazure-functionsazure-eventgrid
Ulf Kristiansen
Ulf Kristiansen

Reputation: 1631

Accessing EventGridEvent.EventType in Azure function binding

I have an Azure function triggered by an EventGridEvent. I'm trying to store all events in Azure tables and give each table the name of the event.

This is how I would solve it without binding:

[FunctionName("MyFunction")]
public static async Task MyFunction([EventGridTrigger] EventGridEvent eventGridEvent)
{
    var table = CloudStorageAccount.Parse(Environment.GetEnvironmentVariable("AzureWebJobsStorage")).CreateCloudTableClient().GetTableReference(eventGridEvent.EventType);
    await table.CreateIfNotExistsAsync();
    // etc...
}

But I would like to accomplish it with bindings.

This is what I tried:

 [FunctionName("MyFunction")]
 public static async Task MyFunction(
     [EventGridTrigger] EventGridEvent eventGridEvent,
     [Table("{EventType}")] CloudTable table)
    {
    }

I'm getting this error:

Microsoft.Azure.WebJobs.Host: Error indexing method 'MyFunction'. Microsoft.Azure.WebJobs.Host: Unable to resolve binding parameter 'EventType'. Binding expressions must map to either a value provided by the trigger or a property of the value the trigger is bound to, or must be a system binding expression (e.g. sys.randguid, sys.utcnow, etc.).

Surely EventType is a property of EventGridEvent which the trigger is bound to?

How should I access EventGridEvent.EventType in the binding?

Upvotes: 1

Views: 815

Answers (1)

krishg
krishg

Reputation: 6508

Unfortunately, for Event Grid trigger/binding, that kind of property binding expression (e.g. {EventType}) is not supported. That's why you don't see that in Event Grid trigger doc as opposed to places where such binding is supported (e.g. Service Bus)

Upvotes: 3

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