public Stream GetReadStream(object entity, string etag, bool?
checkETagForEquality, DataServiceOperationContext operationContext)
{
if (checkETagForEquality != null)
{
// This stream provider implementation does not support
// ETag headers for media resources. This means that we do not track
// concurrency for a media resource and last-in wins on updates.
throw new DataServiceException(400,
"This sample service does not support the ETag header for a media resource.");
}
PhotoInfo image = entity as PhotoInfo;
if (image == null)
{
throw new DataServiceException(500, "Internal Server Error.");
}
// Build the full path to the stored image file, which includes the entity key.
string fullImageFilePath = imageFilePath + "image" + image.PhotoId;
if (!File.Exists(fullImageFilePath))
{
throw new DataServiceException(500, "The image could not be found.");
}
// Return a stream that contains the requested file.
return(new FileStream(fullImageFilePath, FileMode.Open));
}
public string GetStreamContentType(object entity, DataServiceOperationContext operationContext)
{
// Get the PhotoInfo entity instance.
PhotoInfo image = entity as PhotoInfo;
if (image == null)
{
throw new DataServiceException(500, "Internal Server Error.");
}
return(image.ContentType);
}
/// <summary>
/// Create a new PhotoInfo object.
/// </summary>
/// <param name="photoId">Initial value of the PhotoId property.</param>
/// <param name="fileName">Initial value of the FileName property.</param>
/// <param name="dateAdded">Initial value of the DateAdded property.</param>
/// <param name="exposure">Initial value of the Exposure property.</param>
/// <param name="dimensions">Initial value of the Dimensions property.</param>
/// <param name="dateModified">Initial value of the DateModified property.</param>
public static PhotoInfo CreatePhotoInfo(global::System.Int32 photoId, global::System.String fileName, global::System.DateTime dateAdded, Exposure exposure, Dimensions dimensions, global::System.DateTime dateModified)
{
PhotoInfo photoInfo = new PhotoInfo();
photoInfo.PhotoId = photoId;
photoInfo.FileName = fileName;
photoInfo.DateAdded = dateAdded;
photoInfo.Exposure = StructuralObject.VerifyComplexObjectIsNotNull(exposure, "Exposure");
photoInfo.Dimensions = StructuralObject.VerifyComplexObjectIsNotNull(dimensions, "Dimensions");
photoInfo.DateModified = dateModified;
return(photoInfo);
}
public Stream GetWriteStream(object entity, string etag, bool?
checkETagForEquality, DataServiceOperationContext operationContext)
{
if (checkETagForEquality != null)
{
// This stream provider implementation does not support ETags associated with BLOBs.
// This means that we do not track concurrency for a media resource
// and last-in wins on updates.
throw new DataServiceException(400,
"This demo does not support ETags associated with BLOBs");
}
PhotoInfo image = entity as PhotoInfo;
if (image == null)
{
throw new DataServiceException(500, "Internal Server Error: "
+ "the Media Link Entry could not be determined.");
}
// Handle the POST request.
if (operationContext.RequestMethod == "POST")
{
// Set the file name from the Slug header; if we don't have a
// Slug header, just set a temporary name which is overwritten
// by the subsequent MERGE request from the client.
image.FileName = operationContext.RequestHeaders["Slug"] ?? "newFile";
// Set the required DateTime values.
image.DateModified = DateTime.Today;
image.DateAdded = DateTime.Today;
// Set the content type, which cannot be null.
image.ContentType = operationContext.RequestHeaders["Content-Type"];
// Cache the current entity to enable us to both create a key based storage file name
// and to maintain transactional integrity in the disposer; we do this only for a POST request.
cachedEntity = image;
return(new FileStream(tempFile, FileMode.Open));
}
// Handle the PUT request
else
{
// Return a stream to write to an existing file.
return(new FileStream(imageFilePath + "image" + image.PhotoId.ToString(),
FileMode.Open, FileAccess.Write));
}
}
public void DeleteStream(object entity, DataServiceOperationContext operationContext)
{
PhotoInfo image = entity as PhotoInfo;
if (image == null)
{
throw new DataServiceException(500, "Internal Server Error.");
}
try
{
// Delete the requested file by using the key value.
File.Delete(imageFilePath + "image" + image.PhotoId.ToString());
}
catch (IOException ex)
{
throw new DataServiceException("The image could not be found.", ex);
}
}
/// <summary>
/// Deprecated Method for adding a new object to the PhotoInfo EntitySet. Consider using the .Add method of the associated ObjectSet<T> property instead.
/// </summary>
public void AddToPhotoInfo(PhotoInfo photoInfo)
{
base.AddObject("PhotoInfo", photoInfo);
}
