Compare two lists of object for new, changed, updated on a specific property

Question

I\'ve been trying and failing for a while to find a solution to compare to lists of objects based on a property of the objects. I\'ve read other similar solutions but they w

Answer 1

    ///If image is not in list then add the image to the list

public void AddNew (List masterList, AccomodationImageModel theImage)
{
    masterList.Add(theImage);
}

    /// If Image is in List then change listitem with new one

public void Update (List masterList, int OldOnesID, AccomodationImageModel theNew)
{
    masterList[OldOnesID] = theNew;
}

    /// If Image should delete then removes the image from list

public void Delete (List imgList, AccomodationImageModel theImageToDelete)
{
    masterList.Remove(theImageToDelete);
}


    /// this method checks the image state and do the work

public void CheckState (List masterList, AccomodationImageModel theImage, bool deleteIt)
{


       for(int i = 0; i < masterList.Count; i++)
       {

         if (deleteIt)
         {
            Delete(masterList, theImage);
         }

         else
         {
           if(theImage.ID == 0)
           {
             AddNew(masterList, theImage);
           }

           if(masterList[i].ID == theImage.ID)
           {
             Update(masterList, i, theImage);
           }
       }
}

If you prefer use 2 lists as a master and Temporary list, then you can simply iterate your temporary list and each of templist item use CheckState method..

Hope this helps..