Question

在重命名前一个图像后，我试图使用Xamarin Blob保存该图像的新版本。例如，我的旧图片位于名为“ imagecontainer”的容器中，并且ID的名称类似于“ xama_452”

what I would like to do is :

1- Rename the old image name : for example 'xama_452_11_2018"
2-Move it in a container "oldcontainer"
3- then save the new image in "imagecontainer"

我尝试了一些代码，可以上传图像/ blob，但无法重命名并将其移动到另一个容器中。

 protected static async Task<CloudBlockBlob> SaveBlockBlob(string containerName, byte[] blob, string blobTitle)
        {

            var blobContainer = GetBlobContainer(containerName);
            var blockBlob = blobContainer.GetBlockBlobReference(blobTitle);

            var oldBlob = blobContainer.GetBlockBlobReference(blockBlob.Uri.ToString());
            var newBlob = blobContainer.GetBlockBlobReference(blockBlob.Uri.ToString().Replace(blobTitle, DateTime.UtcNow.ToString()+ blobTitle));


            await newBlob.StartCopyAsync(oldBlob);

// here is the methode to upload
            // await blockBlob.UploadFromByteArrayAsync(blob, 0, blob.Length).ConfigureAwait(false);

            return blockBlob;
        }

// method to get blob's container 
 static CloudBlobContainer GetBlobContainer(string containerName) => BlobClient.GetContainerReference(containerName);

预先感谢

Answer 1

1-重命名旧的图像名称：例如'xama_452_11_2018“

由于缺少用于在Azure上重命名blob文件的API，您可以使用所需的格式设置newBlobName并将源复制到目标。请参阅此article。

2-将其移动到“ oldcontainer”容器中

您可以获取目标容器的blob以复制源。请参阅此one。

3-然后将新图像保存在“ imagecontainer”中

将blob上载到sourcecontainer。请参阅此article。

整个代码如下：

public static void RenameBlob(string containerName, string destContainer,string blobName,string newblobname)
{
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));
    CloudBlobClient cloudBlobClient = storageAccount.CreateCloudBlobClient();
    CloudBlobContainer imgcontainer = cloudBlobClient.GetContainerReference(containerName);
    string[] name = blobName.Split('.');
    //rename blob
    string newBlobName = name[0] + "_"+DateTime.Now.ToString("MM")+"_"+DateTime.Now.ToString("yyyy") + "." + name[1];
    CloudBlobContainer oldcontainer = cloudBlobClient.GetContainerReference(destContainer);
    if (!oldcontainer.Exists())
    {
        throw new Exception("Destination container does not exist.");
    }
    CloudBlockBlob blobCopy = oldcontainer.GetBlockBlobReference(newBlobName);
    if (!blobCopy.Exists())
    {
        CloudBlockBlob blob = imgcontainer.GetBlockBlobReference(blobName);
        if (blob.Exists())
        {
            //move blob to oldcontainer
            blobCopy.StartCopy(blob);
            blob.Delete();
        }
    }
    //upload blob to imagecontainer
    CloudBlockBlob cloudblobnew = imgcontainer.GetBlockBlobReference(newblobname);
    cloudblobnew.UploadFromFileAsync(newfile);
}

如果您仍有任何问题，请随时告诉我。希望对您有帮助。

重命名Blob，然后保存新的

1 个答案: