如何从 Azure Blob 存储获取今天修改的文件

Question

我想从 Azure Blob 存储中获取每天修改的文件。我们在 Azure 中有一个容器，每天由两个 Excel 文件填充，我需要获取这些文件。

到目前为止，我只能使用latestmodifiedon. 我怎样才能得到这两个文件？

private static DataSet GetExcelBlobData()
{
    var containerName = "salesbycontract";
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(Microsoft.Azure.CloudConfigurationManager.GetSetting("StorageConnectionString"));

    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
    CloudBlobContainer container = blobClient.GetContainerReference(containerName);
    CloudBlockBlob blockbob = container.ListBlobs().OfType<CloudBlockBlob>().OrderByDescending(m => m.Properties.LastModified).ToList().First();

    var x = blockbob.Name;
    Console.WriteLine(x);

    DataSet ds;
    using (var memstream = new MemoryStream())
    {
        blockbob.DownloadToStream(memstream);

        var excelReader = ExcelReaderFactory.CreateOpenXmlReader(memstream);
        ds = excelReader.AsDataSet();
        excelReader.Close();
    }
    return ds;
}

Answer 1

只需添加一个Where子句并与以下内容进行比较DateTime.Today：

var blockbob = container.ListBlobs().OfType<CloudBlockBlob>()
    .Where(m => m.Properties.LastModified.Value.Date == DateTime.Today).ToList().First();

我向 GitHub存储库添加了一个工作示例，该示例使用 dotnet core 和最新的 WindowsAzure.Storage SDK：

public async Task RetrieveBlobsModifiedTodayAsync()
{
    var container = _blobClient.GetContainerReference(_storageAccount.ContainerName);

    BlobContinuationToken blobContinuationToken = null;
    do
    {
        var results = await container.ListBlobsSegmentedAsync(null, blobContinuationToken);

        var blobs = results.Results.OfType<CloudBlockBlob>()
            .Where(b => b.Properties.LastModified != null && b.Properties.LastModified.Value.Date == DateTime.Today);

        blobContinuationToken = results.ContinuationToken;
        foreach (var item in blobs)
        {
            Console.WriteLine(item.Uri);
        }
    } while (blobContinuationToken != null); // Loop while the continuation token is not null. 
}