如何等待方法从Azure Blob存储中完成下载文件？ [英] How to wait for a method to complete the Download file from Azure Blob Storage?

问题描述

我正在从Azure Blob存储&中下载一些blobitem我的代码是

Hi,

I am downloading some blobitem from Azure Blob Storage & my code is

public Response DownloadFilesFromAzure(List<string> fileNameList, string folderPath)
{
	response = new Response();
	try
	{       
		string azureConnectionStrig = "DefaultEndpointsProtocol=https;AccountName=" + storageConfig.AccountName + ";AccountKey=" + storageConfig.AccesssKey;
		storageAcc = CloudStorageAccount.Parse(azureConnectionStrig);
		blobClient = storageAcc.CreateCloudBlobClient();
		container = blobClient.GetContainerReference(storageConfig.AccountName); // BlobName : storageConfig.AccountName           
		
		foreach (var blobitem in fileNameList)
		{
			var blobItems = container.ListBlobs(blobitem).ToList();

			blockBlob = container.GetBlockBlobReference(blobItems[0].Uri.ToString());
			var fileName = blockBlob.Name.Substring(blockBlob.Name.LastIndexOf('/') + 1);
			
			blockBlob.BeginDownloadToFile(Path.Combine(folderPath, fileName), FileMode.OpenOrCreate, null, null);
			
			//Task task = Task.Run(()=> blockBlob.BeginDownloadToFile(Path.Combine(folderPath, fileName), FileMode.OpenOrCreate, null, null));
			//task.Wait();                    
		}

		// here my method to zip & move file
		ZipAndMove();
		
		response.ErrorCode = ErrorCode.Success;
		return response;

	}
	catch (Exception e)
	{
		Logging.Log(e.Message, 20, true);
		throw e;
	}           
}

问题是在下载完成之前调用ZipAndMove的方法。

我也使用注释代码，即

the Problem is method ZipAndMove is called before download complete.
I also use the commented code i.e

//Task task = Task.Run(()=> blockBlob.BeginDownloadToFile(Path.Combine(folderPath, fileName), FileMode.OpenOrCreate, null, null));
//task.Wait();

但问题仍然存在。



请帮助解决这个问题。

but the problem remain.

Please help to solve this problem.

推荐答案

您正在使用一个设计为异步的方法（BeginDownloadToFile）...

使用 AsyncCallback [ ^ ] param知道何时下载完成或使用 DownloadToFile [ ^ ]同步下载......

You are using a method (BeginDownloadToFile) that designed to be asynchronous...
Use AsyncCallback[^] param to know when download finished or use DownloadToFile[^] to download synchronously...

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