c# - 如果目标中存在 Blob，如何覆盖 Blob

Question

我正在使用 TransferManager 将 blob 从一个容器复制到另一个容器。

CloudStorageAccount sourceStorageAccount = CloudStorageAccount.Parse(@"source storage account connection string");
CloudStorageAccount destStorageAccount = CloudStorageAccount.Parse(@"destination storage account connection string");

CloudBlobClient sourceBlobClient = sourceStorageAccount.CreateCloudBlobClient();
CloudBlobClient destBlobClient = destStorageAccount.CreateCloudBlobClient();
var sourceContainer = sourceBlobClient.GetContainerReference("sourceContainer");
var destContainer = destBlobClient.GetContainerReference("destContainer");

CloudBlockBlob sourceBlob = sourceContainer.GetBlockBlobReference("copy.txt");
CloudBlockBlob targetBlob = destContainer.GetBlockBlobReference("copy.txt");

TransferManager.CopyAsync(sourceBlob, targetBlob, true).Wait();

但是当文件存在于目标中时，它会抛出错误说明

"Skiped file \"https://sourceabcd.blob.core.windows.net/sourcecontainer/test1.txt\" because target \"https://sourceabcd.blob.core.windows.net/destcontainer/test1.txt\" already exists."} System.Exception {Microsoft.WindowsAzure.Storage.DataMovement.TransferSkippedException

如果目标中存在该文件，是否可以选择覆盖该文件？

Answer 1

您可能会从 here 得到异常

我认为你可以做如下所示

TransferContext transferContext = new SingleTransferContext();
transferContext.ShouldOverwriteCallbackAsync = TransferContext.ForceOverwrite;
TransferManager.CopyAsync(sourceBlob, targetBlob, true,null,transferContext).Wait();

我对此不太了解，但我在 github 上找到了一些测试用例 here