帮我写一个azure function 实现返回指定路径下的blob对象

以下是一个Azure Function的示例代码，可以返回指定路径下的Blob对象：

using System.IO;
using System.Linq;
using Microsoft.AspNetCore.Http;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Extensions.Logging;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;

public static class GetBlobFunction
{
    [FunctionName("GetBlob")]
    public static async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Function, "get", Route = "blobs/{container}/{*blobName}")] HttpRequest req,
        string container,
        string blobName,
        ILogger log)
    {
        log.LogInformation($"GetBlob function processed a request for container '{container}' and blob '{blobName}'.");

        // Retrieve the storage account connection string and blob client
        string connectionString = Environment.GetEnvironmentVariable("AzureWebJobsStorage");
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString);
        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

        // Retrieve the container reference and the blob reference
        CloudBlobContainer blobContainer = blobClient.GetContainerReference(container);
        CloudBlockBlob blob = blobContainer.GetBlockBlobReference(blobName);

        // Check if the blob exists
        if (!await blob.ExistsAsync())
        {
            return new NotFoundResult();
        }

        // Read the blob content into a memory stream
        using (var memoryStream = new MemoryStream())
        {
            await blob.DownloadToStreamAsync(memoryStream);
            var blobContent = memoryStream.ToArray();

            // Return the blob content as a stream response
            return new FileStreamResult(new MemoryStream(blobContent), blob.Properties.ContentType);
        }
    }
}

该函数使用HTTP触发器，可以通过以下URL访问它：

https://<function_app_name>.azurewebsites.net/api/blobs/<container_name>/<blob_path>

其中，<function_app_name>是你的Azure Function App的名称，<container_name>是Blob存储中的容器名称，<blob_path>是要获取的Blob对象的路径和文件名。例如，如果要获取mycontainer容器中的images/logo.png文件，可以使用以下URL：

https://<function_app_name>.azurewebsites.net/api/blobs/mycontainer/images/logo.png

函数将返回Blob对象的内容作为流响应。如果Blob对象不存在，则会返回404 Not Found响应