如何从asp.net web api中删除Azure blob

将图像从我的web api上传到azure blob存储可以很好地工作，但在尝试删除它们时，我会收到以下错误："Microsoft.WindowsAzure.Storage.dll中出现类型为"Microsoft.WindowsAzure.StorageException"的异常，但未在用户代码中进行处理

这是我使用的代码：

// Retrieve storage account from connection string.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
CloudConfigurationManager.GetSetting("StorageConnectionString"));
// Create the blob client.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Retrieve reference to a previously created container.
CloudBlobContainer container = blobClient.GetContainerReference("mycontainer");
// Retrieve reference to a blob named "myblob.txt".
CloudBlockBlob blockBlob = container.GetBlockBlobReference("myblob.txt");
// Delete the blob.
 blockBlob.Delete();

我尝试使用的代码来自：https://azure.microsoft.com/sv-se/documentation/articles/storage-dotnet-how-to-use-blobs/#delete-斑点

非常感谢任何帮助或意见，谢谢！

var result= blockBlob.DeleteIfExists();