Some bindings are bi-directional, while some can be used only one way. What's more, not every binding can be used as a trigger. An example of both bi-directional and trigger binding is Azure Blob Storage. Here, you can find an example of how it works as a trigger:
[FunctionName("BlobTriggerCSharp")] public static void Run([BlobTrigger("my-blobs/{name}")] Stream myBlob, string name, TraceWriter log){}
Compare it with an example of a function triggered by a queue, but accepting blob as input:
[FunctionName("BlobInput")]public static void BlobInput( [QueueTrigger("myqueue-items")] string myQueueItem, [Blob("samples-workitems/{queueTrigger}", FileAccess.Read)] Stream myBlob, TraceWriter log){}
As you can see, I used ...
