Custom Storage Provider

Implement a custom storage provider to save uploaded files to any backend: Azure Blob, AWS S3, MongoDB GridFS, or your own storage. Implement the IUploaderProvider interface and register it in web.config appSettings.

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<%-- 1. Implement the IUploaderProvider interface --%>
public class AzureBlobProvider : IUploaderProvider
{
 private readonly CloudBlobContainer _container;

 public AzureBlobProvider()
 {
 string connStr = ConfigurationManager
 .AppSettings["AzureStorageConnection"];
 var account = CloudStorageAccount.Parse(connStr);
 var client = account.CreateCloudBlobClient();
 _container = client.GetContainerReference("uploads");
 _container.CreateIfNotExists();
 }

 public UploadResult Save(
 Stream stream, string fileName, string contentType)
 {
 string blobName = Guid.NewGuid() + "/" + fileName;
 var blob = _container.GetBlockBlobReference(blobName);
 blob.Properties.ContentType = contentType;
 blob.UploadFromStream(stream);
 return new UploadResult
 {
 FileId = blobName,
 FileName = fileName,
 Url = blob.Uri.ToString()
 };
 }

 public FileResult GetFile(string fileId)
 {
 var blob = _container.GetBlockBlobReference(fileId);
 var ms = new MemoryStream();
 blob.DownloadToStream(ms);
 ms.Position = 0;
 return new FileResult
 {
 Stream = ms,
 ContentType = blob.Properties.ContentType
 };
 }

 public void Delete(string fileId)
 {
 _container.GetBlockBlobReference(fileId)
 .DeleteIfExists();
 }
}

<%-- 2. Register in web.config appSettings --%>
<appSettings>
 <add key="AjaxUploader:StorageProvider"
 value="MyApp.Providers.AzureBlobProvider, MyApp" />
 <add key="AzureStorageConnection"
 value="DefaultEndpointsProtocol=https;AccountName=...;AccountKey=..." />
</appSettings>

<%-- 3. Or register in Global.asax Application_Start --%>
protected void Application_Start()
{
 AjaxUploaderConfig.StorageProvider =
 new AzureBlobProvider();
}