C# 从BlockBlob元数据中获取以特定键字符串开头的所有值

我有一个具有多个元数据属性的

BlockBlob

图像。某些元数据属性是唯一的。其他的则以密钥标识符（在本例中为“标记”）开始

如何获取以特定字符串开头的元数据属性的所有值

下面是

BlockBlob

图像的示例：

有多个以索引0开头的“标记”元素

以下是手动执行此操作的方法，但您需要了解存在的每个索引：

CloudBlobContainer container = await GetCloudBlobClientAsync();
CloudBlobDirectory directory = container.GetDirectoryReference(path);

// Get max of 100 blobs including their metadata properties
var blobs = await directory.ListBlobsSegmentedAsync(false, BlobListingDetails.Metadata, 100, null, null, null);
foreach (var blob in blobs.Results) {
    var imageBlob = new CloudBlockBlob(blob.Uri);
    var blockBlob = imageBlob.GetBlockBlobReference(imageBlob.Name);
    await blockBlob.DownloadTextAsync();

    // This is what I'm trying to do..
    var tagArray = [ blockBlob.Metadata["Tag0"], blockBlob.Metadata["Tag1"], ... ]
    // Returns ["outdoor", "nature", "man" ...]

    // Bonus if it included the key names as well..
    var tagArrayWithKeys = [ "Tag0": blockBlob.Metadata["Tag0"], ... ];
    // Returns [ "Tag0": "outdoor", "Tag1": "nature", "Tag2": "man", ...]
}

---

您将如何动态地做到这一点？

正如@Gaurav所说，如果您想要获取一个blob的所有元数据，您可以执行一个循环来获取它们。比如说

CloudBlobContainer container = await GetCloudBlobClientAsync();
CloudBlobDirectory directory = container.GetDirectoryReference(path);



// Get max of 100 blobs including their metadata properties
var blobs = await directory.ListBlobsSegmentedAsync(false, BlobListingDetails.Metadata, 100, null, null, null);
foreach (var blob in blobs.Results) {
    var imageBlob = new CloudBlockBlob(blob.Uri);
    var blockBlob = imageBlob.GetBlockBlobReference(imageBlob.Name);
    await blockBlob.DownloadTextAsync();
    foreach(var r in blockBlob.Metadata){
     Console.WriteLine("Key: " + r.Key + " value: " + r.Value);

}

}

此外，如果您想通过键获取元数据过滤器，请参考以下代码

CloudBlobContainer container = await GetCloudBlobClientAsync();
CloudBlobDirectory directory = container.GetDirectoryReference(path);



// Get max of 100 blobs including their metadata properties
var blobs = await directory.ListBlobsSegmentedAsync(false, BlobListingDetails.Metadata, 100, null, null, null);
foreach (var blob in blobs.Results) {
    var imageBlob = new CloudBlockBlob(blob.Uri);
    var blockBlob = imageBlob.GetBlockBlobReference(imageBlob.Name);
    await blockBlob.DownloadTextAsync();
    var result = blockBlob.Metadata.where(k => k.Key.StartsWith("Tag"))
    foreach(var r in result){
     Console.WriteLine("Key: " + r.Key + " value: " + r.Value);

}
}

---

CloudBlockBlob.Metadata是类型为

IDictionary

的对象。难道你不能简单地列举一下，然后从每个条目中提取键和值吗？@gauravmantri如果没有比“内容”更多的唯一标识符，那么这就是一种方法。我想列举一个

FromPattern

或

StartsWith

或

包含的