在Azure中添加，编辑元数据 [英] Add , Edit Metadata in Azure

问题描述

我最近在这里提出了一个问题，多亏了Gaurav Mantri，我可以将元数据添加到blob azure中. 在AzureBlobStorage类中编辑后的代码:

I recently asked a question here and thanks to Gaurav Mantri I could add Metadata to blob azure . my Code after editing in AzureBlobStorage class :

  public void SaveMetaData(string fileName, string container, string key, string value)
{
    var blob = GetBlobReference(fileName, container);
        blob.FetchAttributes();
        blob.Metadata.Add(key, value);
        blob.SetMetadata();
}

然后我从myController调用它:

and I call it from myController by this :

public JsonResult SaveMetaData(string name, string key, int id)
    {
        var uploadedFils = _FileStorage.GetUploadedFiles("images", id + "/");


if (!uploadedFils.Any())
                _FileStorage.SaveMetaData(name, "images", key, "true");
        foreach (var file in uploadedFils)
        {
            if (name == file.Name)
            {
                _FileStorage.SaveMetaData(FormatFileName(id, name), "images", key, "true");

            }
            else
            {
                _FileStorage.SaveMetaData(FormatFileName(id, file.Name), "images", key, "false");

            }
        }
        return Json("");


    }

获取上传文件的代码

public IEnumerable<Attachment> GetUploadedFiles(string container, string blobprefix)
    {
        if (string.IsNullOrWhiteSpace(container))
            container = DefaultBlobContainer;

        var storageAccount = CreateStorageAccountFromConnectionString(GetStorageConnectionString());
        var blobContainer = GetBlobContainer(storageAccount, container);

        var resultList = new List<Attachment>();
        try
        {
            foreach (IListBlobItem item in blobContainer.ListBlobs(blobprefix, false))
            {
                var blob = (CloudBlockBlob) item;
                var file = new Attachment
                {
                    Name = blob.Name.Substring(blob.Name.LastIndexOf('/') + 1),
                    Size = blob.Properties.Length,
                    Extension = Path.GetExtension(blob.Name)
                };
                resultList.Add(file);
            }
        }
        catch (Exception e)
        {

        }

        return resultList;
    }

，当我单击想要设置为active的所需图像时，我将调用此操作. 第一次可以使用，但是我不知道如何编辑它以进行第二次单击，特别是这是我第一次使用Azure? 这行背后的逻辑是:当图库为空并且用户上传第一张图像时，该图像将自动设置为活动状态:

and I call this action when I click on the desired image that I want to set as active . for first time it works , but I don't know how to edit it for second click ,specially this is first time for me dealing with Azure ? the logic behind this line that : when the Gallery is empty and the users upload the first image , this image will be set automatically to active:

    if (!uploadedFils.Any())
            _FileStorage.SaveMetaData(name, "images", key, "true");

推荐答案

根据您的描述，我检查了您的代码，您需要按以下方式修改代码:

According to your description, I checked your code, you need to modify your code as follows:

SaveMetaData 方法:

public void SaveMetaData(string fileName, string container, string key, string value)
{
    var blob = GetBlobReference(fileName, container);
    blob.FetchAttributes();
    if (blob.Metadata.ContainsKey(key))
    {
        blob.Metadata[key] = value;
    }
    else
        blob.Metadata.Add(key, value);
    blob.SetMetadata();
}

根据您的方案，您的图像文件将被上载到images\{id}\{filename}.并且在调用控制器下的 SaveMetaData 之前，需要确保具有特定参数name和id的文件存在于Blob存储中.我假设您需要删除以下代码段:

Based on your scenario, your image files would be uploaded to images\{id}\{filename}. And before you invoke the SaveMetaData under your controller, you need to make sure the file with the specific parameters name and id exists in your blob storage. I assumed that you need to remove the following code snippet:

if (!uploadedFils.Any())
   FileStorage.SaveMetaData(name, "images", key, "true");

注意:如果没有文件，则无法为其添加/更新元数据.同样，您只需为参数fileName设置name而不组合id.根据我的理解，SaveMetaData方法用于设置现有文件的元数据.我建议您将上述逻辑转移到用于上传文件的操作上，并在没有文件的情况下设置默认的元数据.

Note: If there has no files, you could not add/update the meta data for it. Also, you just set the name for the parameter fileName without combining the id. Based on my understanding, the SaveMetaData method is used to set meta data for existing files. I recommend you move the above logic to the action for uploading the file and set the default meta data if there has no files.

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