asp.net-mvc - 将图片上传到 Windows Azure 网站

Question

我有一个 ASP.NET MVC 4 应用程序，我想将其部署到 Windows Azure。该应用程序的一部分涉及上传图片。当图片上传后，我想将图片存储在位于 /pictures/uploaded 的目录中。

我的问题是，如何将图片上传到 Windows Azure 上托管的应用程序内的相对路径？到目前为止，我的应用程序已托管在虚拟机中。我能够通过使用以下内容来完成上述操作:

string path = ConfigurationManager.AppSettings["rootWebDirectory"] + "/pictures/uploaded;

// Get the file path
if (Directory.Exists(path) == false)
  Directory.CreateDirectory(path);

string filePath = path + "/uploaded" + DateTime.UtcNow.Milliseconds + ".png";
filePath = filePath.Replace("/", "\\").Replace("\\\\", "\\");

// Write the picture to the file system
byte[] bytes = GetPictureBytes();
using (FileStream fileStream = new FileStream(filePath, FileMode.Create))
{
  fileStream.Write(bytes, 0, bytes.Length);
  fileStream.Flush();
  fileStream.Close();
}

目前，ConfigurationManager.AppSettings["rootWebDirectory"] 指向绝对路径。我相信这就是我的问题所在。我不知道如何将所有这些切换到相对路径。

谢谢!

Answer 1

这是我对如何在 azure 中进行设置的简单描述。 http://geekswithblogs.net/MagnusKarlsson/archive/2012/12/02/how-to-use-azure-storage-for-images.aspx

//编辑；这是我博客中的完整示例(如果博客消失了)。 yourViewName.cshtml

 @model List<string>  
 @{
     ViewBag.Title = "Index";
 }

 <h2>Index</h2>
 <form action="@Url.Action("Upload")" method="post" enctype="multipart/form-data">

     <label for="file">Filename:</label>
     <input type="file" name="file" id="file1" />
     <br />
     <label for="file">Filename:</label>
     <input type="file" name="file" id="file2" />
     <br />
     <label for="file">Filename:</label>
     <input type="file" name="file" id="file3" />
     <br />
     <label for="file">Filename:</label>
     <input type="file" name="file" id="file4" />
     <br />
     <input type="submit" value="Submit" />

 </form>

 @foreach (var item in Model) {

     <img src="@item" alt="Alternate text"/>
  }

您的 Controller 操作

public ActionResult Upload(IEnumerable<HttpPostedFileBase> file)
         {
             BlobHandler bh = new BlobHandler("containername");
             bh.Upload(file);
             var blobUris=bh.GetBlobs();

             return RedirectToAction("Index",blobUris);
         }

你的模型

 public class BlobHandler
     {
         // Retrieve storage account from connection string.
         CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
         CloudConfigurationManager.GetSetting("StorageConnectionString"));

         private string imageDirecoryUrl; 

         /// <summary>
         /// Receives the users Id for where the pictures are and creates 
         /// a blob storage with that name if it does not exist.
         /// </summary>
         /// <param name="imageDirecoryUrl"></param>
         public BlobHandler(string imageDirecoryUrl)
         {
             this.imageDirecoryUrl = imageDirecoryUrl;
             // Create the blob client.
             CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

             // Retrieve a reference to a container. 
             CloudBlobContainer container = blobClient.GetContainerReference(imageDirecoryUrl);

             // Create the container if it doesn't already exist.
             container.CreateIfNotExists();

             //Make available to everyone
             container.SetPermissions(
                 new BlobContainerPermissions
                 {
                     PublicAccess = BlobContainerPublicAccessType.Blob
                 });
         }

         public void Upload(IEnumerable<HttpPostedFileBase> file)
         {
             // Create the blob client.
             CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

             // Retrieve a reference to a container. 
             CloudBlobContainer container = blobClient.GetContainerReference(imageDirecoryUrl);

             if (file != null)
             {
                 foreach (var f in file)
                 {
                     if (f != null)
                     {
                         CloudBlockBlob blockBlob = container.GetBlockBlobReference(f.FileName);
                         blockBlob.UploadFromStream(f.InputStream);
                     }
                 }
             }
         }

         public List<string> GetBlobs()
         {
             // Create the blob client. 
             CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

             // Retrieve reference to a previously created container.
             CloudBlobContainer container = blobClient.GetContainerReference(imageDirecoryUrl);

             List<string> blobs = new List<string>();

             // Loop over blobs within the container and output the URI to each of them
             foreach (var blobItem in container.ListBlobs())
                 blobs.Add(blobItem.Uri.ToString());

             return blobs;
         }
     }