打开存储在Azure Blob存储中的pdf文件(使用字节) [英] Open a pdf file(using bytes) stored in Azure Blob storage

问题描述

我正在尝试调整旧的逻辑以支持blob中的文件，谁能指导我如何打开存储在azure blob存储器中的pdf文件.

I am trying to tweak the old logic to support files from blob, Can anyone guide me how to open a pdf file which is stored in azure blob storage.

我尝试搜索并找到了答案如何从Azure Blob存储将文件下载到浏览器 这是使用SAS配置做到的(如果我没记错的话).

I tried to search and found the answer How to download a file to browser from Azure Blob Storage which is using SAS configuration to do that (if i am not wrong).

通过转换为字节有什么办法吗?

Is there any way to do by converting to bytes?

从Windows位置打开pdf文件的早期逻辑

Earlier logic to open a pdf file from windows location

Response.Buffer = true;
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.ContentType = "application/pdf";
Response.AppendHeader("content-disposition", "inline; filename=" + mapid + ".pdf");

FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read);
BinaryReader br = new BinaryReader(fs);
Byte[] dataBytes = br.ReadBytes((int)(fs.Length - 1));
Response.BinaryWrite(dataBytes);
br.Close();
fs.Close();

我正在重新编写从blob读取文件的逻辑，下面的代码是到目前为止我尝试过的代码，

I am rewritting the logic to read the file from blob, below code is what i have tried so far,

Byte[] dataBytes1;
CloudBlockBlob blobfile = GetStorageAccount(true).GetBlockBlobReference(filename);
blobfile.FetchAttributes();

using (StreamReader blobfilestream = new StreamReader(blobfile.OpenRead()))
{
    dataBytes1 = blobfilestream.CurrentEncoding.GetBytes(blobfilestream.ReadToEnd());
}
Byte[] value = BitConverter.GetBytes(dataBytes1.Length - 1);
Response.BinaryWrite(value);

但是文件未打开，错误为无法加载". 如果这是个好方法，谁能指导我?

But the file is not opening with error "Failed to Load". Can anyone guide me if this is good approach to do it?

推荐答案

     public async System.Threading.Tasks.Task<ActionResult> DownloadFile()
    {
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
        ConfigurationManager.ConnectionStrings["azureconnectionstring"].ConnectionString);
        CloudBlobClient client = storageAccount.CreateCloudBlobClient();
        CloudBlobContainer blobContainer = client.GetContainerReference("my-blob-storage");
    CloudBlockBlob blob = blobContainer.GetBlockBlobReference("filename.pdf");
        var exists = blob.Exists(); // to verify if file exist
        blob.FetchAttributes();
        byte[] dataBytes1;
        using (StreamReader blobfilestream = new StreamReader(blob.OpenRead()))
        {
            dataBytes1 = blobfilestream.CurrentEncoding.GetBytes(blobfilestream.ReadToEnd());
            await blob.DownloadToStreamAsync(Response.OutputStream);
        }

        Byte[] value = BitConverter.GetBytes(dataBytes1.Length - 1);
        string mimeType = "application/pdf";
        Response.AppendHeader("Content-Disposition", "inline; filename=" + "filename.pdf");

        return File(value, mimeType);

}

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