Azure Functions - Blob 流输出绑定 [英] Azure Functions - Blob Stream output binding

问题描述

我创建了一个带有 blob 存储触发器的 Azure 函数 - 我想处理一个文件，然后将文件转储到另一个 blob 存储容器.

I've created an Azure function with a blob storage trigger - I want to process a file and then dump the file out to another blob storage container.

在最简单的情况下，我想它看起来像这样:

In the simplest case I suppose it would look like this:

public static void Run(Stream blob, string name, out Stream outputBlob, TraceWriter log)
{
    outputBlob = blob;
}

这些是我的绑定:

{
  "bindings": [
    {
      "name": "blob",
      "type": "blobTrigger",
      "direction": "in",
      "path": "input/{name}",
      "connection": "wlimportstaging_STORAGE"
    },
    {
      "name": "outputBlob",
      "type": "blob",
      "direction": "out",
      "path": "original/{name}",
      "connection": "wlimportstaging_STORAGE"
    }
  ],
  "disabled": false
}

我从文档中了解到，如果您返回一个 POCO，它将把它序列化为 JSON.

I've read from the documentation that if you return a POCO it will serialize it as JSON.

https:///docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-storage-blob#output-usage

这似乎表明您可以输出到流 - 我似乎得到了:

This seems to suggest you can output to a stream - I just seem to be getting:

Microsoft.Azure.WebJobs.Host:无法将 Blob 绑定到类型System.IO.Stream&

请帮忙！

推荐答案

这很好.如果有更好的方法，我会很感兴趣.

This worked fine. If there is a better approach I would be really interested.

public static async Task Run(Stream blob, string name, Stream outBlob, TraceWriter log)
{
    using (MemoryStream ms = new MemoryStream())
    {
        blob.CopyTo(ms);
        var byteArray = ms.ToArray();
        await outBlob.WriteAsync(byteArray, 0, byteArray.Length);
    }
}

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