public async Task <string> UploadBlobAsync(HttpPostedFileBase file, string containerName)
{
//check file size and extension
if (FileUploadUtility.InvalidFileSize(file))
{
throw new FileLoadException("The file cannot be bigger than 7MB.");
}
if (FileUploadUtility.InvalidFileExtension(file))
{
throw new FileLoadException("The file type is not authorized for upload.");
}
CloudBlobContainer container = GetCloudBlobContainer(containerName);
await container.CreateIfNotExistsAsync(BlobContainerPublicAccessType.Blob, null, null);
//build filename with timestamp to reduce risk of duplicates
string blobName = FileUploadUtility.GetFilenameWithTimestamp(file.FileName);
CloudBlockBlob blockBlob = container.GetBlockBlobReference(blobName);
try
{
await blockBlob.UploadFromStreamAsync(file.InputStream);
return(blockBlob.Uri.ToString());
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
public static String GetFilenameWithTimestamp(string filename)
{
return(Path.GetFileNameWithoutExtension(filename) + "_" + FileUploadUtility.GetTimestamp(DateTime.Now) + Path.GetExtension(filename));
}