Is there a way to change blob path in a blob binding for azure function?

Question

I am using an azure function that is gonna save multiple xml files with different names to the same blob container. I want to use data from other binding for format the name.

Blob binding:

[Blob("outbound/", FileAccess.Write, Connection = 
Settings.InbundBlobConnectionString)] Stream outboundBlob

Is there a way I can manipulate the blob path using code?

Answer 1

We could use imperative binding pattern . In function method signature, add Binder binder , remove Blob input binding and try code below.

        string myBlobName = "valueGotFromOtherBinding";
        var attributes = new Attribute[]
        {
            new BlobAttribute($"outbound/{myBlobName}", FileAccess.Write),
            new StorageAccountAttribute(Settings.InbundBlobConnectionString)
        };
        using (var writer = await binder.BindAsync<TextWriter>(attributes))
        {
            await writer.WriteAsync("Conetent");
        }

Answer 2

In the case when the blobName value is in the Trigger binding JSON payload (for instance in the message/request body), you can use a POCO object, see the following:

[QueueTrigger("myQueueName", Connection = "mySTORAGE")] POCO item,
[Blob("outbound/{blobName}", FileAccess.Write, Connection = Settings.InbundBlobConnectionString)] Stream outboundBlob

   …

public class POCO
{
  // ...
  public string blobName { get; set;}
}

Here's the doc .