如何使用BlobTrigger绑定到Azure函数中的CloudBlockBlob？

Question

I have the following function in my project:

[FunctionName("my-func")]
public static async Task Run([BlobTrigger("data/{name}")] CloudBlockBlob blob, string name, TraceWriter log)
{
    log.Info($"Started Processing: {name}");

    await blob.DeleteAsync();

    log.Info($"Finished Processing: {name}");
}

When I attempt to run the function locally using v1.0.4 of the Azure Functions CLI I get this error:

Microsoft.Azure.WebJobs.Host: Error indexing method 'SampleFunction.Run'. Microsoft.Azure.WebJobs.Host: Can't bind BlobTrigger to type 'Microsoft.WindowsAzure.Storage.Blob.CloudBlockBlob'.

All documentation I have seen for Azure Functions and WebJobs SDK say this is supported.

https://github.com/Azure/azure-webjobs-sdk/wiki/Blobs#-types-that-you-can-bind-to-blobs

Answer 1

You are probably referencing some NuGet package that has a dependency on non-compatible version of WindowsAzure.Storage assembly (version 8.xx ). If so, be sure to remove it. Unless you are using some additional binding, your csproj references should look as simple as this:

<ItemGroup>           
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.6" />
</ItemGroup>

Answer 2

Make sure you are running the Azure Storage Emulator:

cd C:\Program Files (x86)\Microsoft SDKs\Azure\Storage Emulator

C:\Program Files (x86)\Microsoft SDKs\Azure\Storage Emulator> AzureStorageEmulator.exe start
Windows Azure Storage Emulator 5.2.0.0 command line tool
Autodetect requested. Autodetecting SQL Instance to use.
Looking for a LocalDB Installation.
Probing SQL Instance: '(localdb)\MSSQLLocalDB'.
Found a LocalDB Installation.
Probing SQL Instance: '(localdb)\MSSQLLocalDB'.
Found SQL Instance (localdb)\MSSQLLocalDB.
Creating database AzureStorageEmulatorDb52 on SQL instance '(localdb)\MSSQLLocalDB'.