Hi,

One of the things that I noticed is that images are not deleted after deleting a picture from an album. I'm only on Chapter 14, but I verified that this is in the final code by running it. I wanted to add code so that a picture would be deleted after successfully deleting a picture record from the Pictures table. I figured that this would be done in the code behind for ManagePhotoAlbum. So I created an EntityDataSource1_Deleting event. My plan was to cast e.Entity to a Picture, use the ImageUrl to get the name, and use File.Delete. But when I look at ((Picture)e.Entity).ImageUrl, the value is null. The only value available is the Id column. I was kind of hoping that there might be a way to use LINQ to get the ImageUrl for the Id that I have. But I couldn't figure out a way to do that.

Any suggestions?

Thanks.

Hi there,

After the post back, the Picture is reconstructed from ViewState, Since the ImageUrl was never stored there, it's not available in ViewState. You can work around this in two ways:

1. Query the object from the EF model again based on the Id of the Picture entity. This requires another trip to the database.

2. Store the ImageUrl in ViewState by adding it to the DataKeyNames property of the ListView.

Exercise 4 of Chapter 14 has an example of the latter.

Cheers,

Imar

__________________
Imar Spaanjaars
http://Imar.Spaanjaars.Com
Follow me on Twitter

Author of Beginning ASP.NET 4.5 : in C# and VB, Beginning ASP.NET Web Pages with WebMatrix
and Beginning ASP.NET 4 : in C# and VB.
Did this post help you? Click the button below this post to show your appreciation!