c# - 无法在上传时间上设置 Azure block Blob 元数据

Question

我有以下代码:

CloudStorageAccount storageAccount = CloudStorageAccount.Parse(Environment.GetEnvironmentVariable("AzureWebJobsStorage"));
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer blobContainer = blobClient.GetContainerReference("images");
CloudBlockBlob blockBlob = blobContainer.GetBlockBlobReference(filename);

using (var stream = new MemoryStream(imageBytes))
{
    blockBlob.Properties.ContentType = contentType;

    blockBlob.Metadata.Add("MyMetadataProperty1", "MyMetadataValue1");
    blockBlob.Metadata.Add("MyMetadataProperty2", "MyMetadataValue2");
    blockBlob.Metadata.Add("MyMetadataProperty3", "MyMetadataValue3");
    blockBlob.Metadata.Add("MyMetadataProperty", "MyMetadataValue4");
    // await blockBlob.SetMetadataAsync(); // Microsoft.WindowsAzure.Storage: The specified blob does not exist.

    await blockBlob.UploadFromStreamAsync(stream);
}

我无法设置上传时间的元数据。

如果我打电话await blockBlob.SetMetadataAsync();之前UploadFromStreamAsync() ，我收到错误:Microsoft.WindowsAzure.Storage: The specified blob does not exist.

我在互联网上找到了一些可以做到这一点的文章:here和 here .

我使用的库:

<PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Storage" Version="3.0.10" />

有什么想法为什么我会遇到这个错误吗？

Answer 1

查看该方法的说明:SetMetadataAsync .

Initiates an asynchronous operation to update the blob's metadata.

它用于更新元数据，因此实际上如果您想在上传 Blob 时设置元数据，只需设置 blockBlob.Metadata.Add(key, value) 或 blockBlob 即可。元数据[键] =“值”。下面是我的测试代码。

        CloudStorageAccount storageAccount = CloudStorageAccount.Parse("connection string");
        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
        CloudBlobContainer blobContainer = blobClient.GetContainerReference("test");
        CloudBlockBlob blockBlob = blobContainer.GetBlockBlobReference("1.txt");

        var filePath = "C:\\Users\\georgec\\Downloads\\test.txt";
        FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
        blockBlob.Metadata["mymetadata"] = "mymetadatavalue";
        //blockBlob.SetMetadataAsync();
        await blockBlob.UploadFromStreamAsync(fileStream);