title: How can I reference {rand-guid} value from declarative binding in Azure function?
body: <p>I have a C# script Azure function and am binding a blob as an output in function.json:</p>
  
  <pre><code>"bindings": [
      ...
      {
        "type": "blob",
        "name": "eventOutputBlob",
        "path": "event-receiver-queue-container/{rand-guid}",
        "connection": "DomBlobStorage",
        "direction": "out"
      }
    ],
    "disabled": false
  }
  </code></pre>
  
  <p>I'm having trouble figuring out how to reference the {rand-guid} parameter inside of my run.csx code so I can store it in a queue for later processing. Is this possible?</p>
  
  <p>This doesn't work but is along the lines of what I was hoping to get in run.csx:</p>
  
  <pre><code>public static async Task&lt;HttpResponseMessage&gt; Run(
      HttpRequestMessage req,
      string rand-guid,
      Stream eventOutputBlob, 
      TraceWriter log) {
  ...
  }
  </code></pre>