如何在 Azure Function (.NET6) 中读取和写入相同的 Blob 文件

Question

在 Azure Function V1 (.NET4) 下面的代码运行良好

[FunctionName("run")]
public static HttpResponseMessage run(
[HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)] HttpRequestMessage request,
[Blob("sample.txt", FileAccess.Read)] Stream readStream,
[Blob("sample.txt", FileAccess.Write)] Stream writeStream) 
{
   //read & write to sample.txt stream works ok
}

但是在 Azure Function V4 (.NET 6) 中，抛出只能访问 1 stream 的错误

[FunctionName("run")]
public static HttpResponseMessage run(
[HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)] HttpRequestMessage request,
[Blob("sample.txt", FileAccess.Read)] Stream readStream,
[Blob("sample.txt", FileAccess.Write)] Stream writeStream) 
{
   //can ONLY use read stream or write stream, can't use both

}

如何读取和写入 Azure Function (.NET6) 中的同一个 Blob 文件？

注意：问题只出现在 Azure 不在本地调试

Answer 1

从我们这边重现后，即使我们添加了 2 个流，它也能正常工作。 确保您的环境是最新的。

[FunctionName("Function1")]
        public static void Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)] HttpRequestMessage req,
        [Blob("samples-workitems/samples.txt", FileAccess.Read)] Stream readStream,
        [Blob("samples-workitems/samples.txt", FileAccess.Write)] Stream writeStream)
        {         
            Console.WriteLine("Blob length is "+ readStream.Length);

            string sample = "Sample Text";

            byte[] bytes = Encoding.ASCII.GetBytes(sample);
            writeStream.Write(bytes, 0, bytes.Length);

        }

考虑这是我的初始文本文件

结果：

后触发后的文本文件

Answer 2

在 Azure Function V4 (.NET 6) 中工作的最终解决方案是BlobClient

使用BlobClient读取/写入 blob 存储中的文件的代码

[FunctionName("Function1")]
public static async Task<IActionResult> Function1(
[HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)] HttpRequestMessage incomingRequest,
[Blob("container-name/file-name.xml", FileAccess.ReadWrite)] BlobClient fileBlobClient)
    { ... }