1. 确认账户和连接字符串是否正确。

string connectionString = "DefaultEndpointsProtocol=https;AccountName=myaccount;AccountKey=mykey;EndpointSuffix=core.windows.net";
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString);
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

2. 确认容器（Container）是否已创建。

CloudBlobContainer container = blobClient.GetContainerReference("mycontainer");
await container.CreateIfNotExistsAsync();

3. 确认Blob是否存在。

CloudBlockBlob blockBlob = container.GetBlockBlobReference("myblob");
if (await blockBlob.ExistsAsync()) 
{
    // 操作Blob
}

4. 优化Blob上传/下载速度。

BlobRequestOptions options = new BlobRequestOptions() 
{
    ParallelOperationThreadCount = 8, // 并发线程数
    SingleBlobUploadThresholdInBytes = 1024 * 1024, // 单个Blob上传分块大小
    DisableContentMD5Validation = true, // 禁用MD5校验
};
blockBlob.UploadFromFileAsync(filePath, null, options, null);

5. 处理异常。

try 
{
    // 操作Blob
} 
catch (StorageException ex) 
{
    if (ex.RequestInformation.HttpStatusCode == 404)
    {
        // Blob不存在
    }
    else 
    {
        // 其他异常
    }
}