ReferenceExpression in DaprComponentResource.WithMetadata

[tomboon]

I'm a bit stuck using Dotnet Aspire and Dapr.

First I define Azurite (Azure Blob Storage emulator) using aspire like so:

var blobstorage = builder
    .AddAzureStorage("mystorage")
    .RunAsEmulator(azurite =>
         azurite.WithLifetime(supportingResourceContainerLifetime)
        .WithBlobPort(10000)        // should be dynamically assigned by aspire, but hardcoded for sake of this discussion
        .WithDataVolume());

I define my dapr binding component like so:

var daprBlobStorageBindingComponent = builder
    .AddDaprComponent("myblobstoragebinding", "bindings.azure.blobstorage", new DaprComponentOptions { })
    .WithMetadata("accountName", "<azurite account>")
    .WithMetadata("accountKey", "<azurite key>")
    .WithMetadata("containerName", "mycontainer")
    .WithMetadata("endpoint", "http://127.0.0.1:10000")  // works with hardcoded string
    // .WithMetadata("endpoint", ReferenceExpression.Create($"http://127.0.0.1:10000"))  // doesn't work !?!
    // .WithMetadata("endpoint",  blobstorage.Resource.BlobUriExpression)  // what I really want
    .WithMetadata("decodeBase64", "false")
    .WithMetadata("disableEntityManagement", "true")
    .WaitFor(blobstorage);

The problem
When defining the Dapr component I pass the Azurite endpoint via metadata, however:

• Passing a hardcoded string works (eg http://127.0.0.1:10000)
• Passing a ReferenceExpression in .WithMetadata does not seem to work.
  Even when my ReferenceExpression is nothing more than eg $"http://127.0.0.1:10000", it still doesn't work.

The Dapr binding does not recognize the passed ReferenceExpression as a valid URL and falls back to 'https://devstoreaccount1.blob.core.windows.net' which is of course not my local azurite anymore.