c# - Azure Functions 绑定(bind)不起作用

Question

我收到此错误:

Microsoft.Azure.WebJobs.Host: Only the 'Read' FileAccess mode is supported for blob container bindings.

根据docs ，应该支持out吗？

我最初尝试在方法定义中添加Attributes。但是，我遇到了同样的错误，因此我删除了方法定义中的所有属性，因此新的方法定义是:

public static async Task RunAsync(CloudBlockBlob myBlob,  string name, 
IAsyncCollector<ProfilePictureUrl> client, CloudBlockBlob resizedBlob, TraceWriter log)

这是我的 function.json

{
  "bindings": [
    {
      "type": "blobTrigger",
      "path": "profile-pictures/{name}",
      "direction": "in",
      "name": "myBlob"
    },
    {
      "type": "documentDB",
      "databaseName": "TestDB",
      "collectionName": "ResizedProfilePictures",
      "createIfNotExists": true,
      "direction": "out",
      "name": "client"
    },
    {
      "type": "blob",
      "path": "resized-profile-pictures",
      "direction": "out",
      "name": "resizedBlob"
    }
  ],
  "disabled": false,
  "scriptFile": "..\\Test.Functions.dll",
  "entryPoint": "Test.Functions.ResizeImage.RunAsync"
}

我使用的是 Azure CLI beta 100。如果我从方法定义和 function.json 中删除了 resizedBlob，那么它就可以正常工作。

Answer 1

CloudBlobContainer 必须作为输入绑定(bind)进行绑定(bind)。这是一个有效的示例:

#r "Microsoft.WindowsAzure.Storage"

using Microsoft.WindowsAzure.Storage.Blob;

public static void Run(Stream input, Stream output, 
                       CloudBlobContainer container, TraceWriter log)
{
    var blobs = container.ListBlobs();
    log.Info($"{blobs.Count()} blobs in container.");
}

以及对应的function.json:

{
  "bindings": [
    {
      "name": "input",
      "type": "blobTrigger",
      "direction": "in",
      "path": "input/{name}",
      "connection": "test_STORAGE"
    },
    {
      "name": "container",
      "type": "blob",
      "direction": "in",
      "path": "input",
      "connection": "test_STORAGE"
    }
  ]
}