public void PopulateAssignedCategoryData(ArtContext context,
Picture picture)
{
var allCategories = context.Category;
var pictureCategories = new HashSet <int>(
picture.PictureCategories.Select(c => c.PictureID));
AssignedCategoryDataList = new List <AssignedCategoryData>();
foreach (var cat in allCategories)
{
AssignedCategoryDataList.Add(new AssignedCategoryData
{
CategoryID = cat.ID,
Name = cat.CategoryName,
Assigned = pictureCategories.Contains(cat.ID)
});
}
}
public void UpdatePictureCategories(ArtContext context,
string[] selectedCategories, Picture pictureToUpdate)
{
if (selectedCategories == null)
{
pictureToUpdate.PictureCategories = new List <PictureCategory>();
return;
}
var selectedCategoriesHS = new HashSet <string>(selectedCategories);
var pictureCategories = new HashSet <int>
(pictureToUpdate.PictureCategories.Select(c => c.Category.ID));
foreach (var cat in context.Category)
{
if (selectedCategoriesHS.Contains(cat.ID.ToString()))
{
if (!pictureCategories.Contains(cat.ID))
{
pictureToUpdate.PictureCategories.Add(
new PictureCategory
{
PictureID = pictureToUpdate.ID,
CategoryID = cat.ID
});
}
}
else
{
if (pictureCategories.Contains(cat.ID))
{
PictureCategory courseToRemove
= pictureToUpdate
.PictureCategories
.SingleOrDefault(i => i.CategoryID == cat.ID);
context.Remove(courseToRemove);
}
}
}
}