static void DeleteRelatedEntities <T>(T entity, EFRecipesEntities context)
where T : EntityObject
{
var entities = ((IEntityWithRelationships)entity)
.RelationshipManager.GetAllRelatedEnds()
.SelectMany(e =>
e.CreateSourceQuery().OfType <EntityObject>()).ToList();
foreach (var child in entities)
{
context.DeleteObject(child);
}
context.SaveChanges();
}
static void RunExample()
{
using (var context = new EFRecipesEntities())
{
var recipe1 = new Recipe {
RecipeName = "Chicken Risotto"
};
var recipe2 = new Recipe {
RecipeName = "Baked Chicken"
};
recipe1.Steps.Add(new Step {
Description = "Bring Broth to a boil"
});
recipe1.Steps.Add(new Step
{
Description =
"Slowly add Broth to Rice"
});
recipe1.Ingredients.Add(new Ingredient {
Name = "1 Cup White Rice"
});
recipe1.Ingredients.Add(new Ingredient
{
Name =
"6 Cups Chicken Broth"
});
recipe2.Steps.Add(new Step
{
Description =
"Bake at 350 for 35 Minutes"
});
recipe2.Ingredients.Add(new Ingredient {
Name = "1 lb Chicken"
});
context.Recipes.AddObject(recipe1);
context.Recipes.AddObject(recipe2);
context.SaveChanges();
Console.WriteLine("All the Related Entities...");
ShowRecipes();
DeleteRelatedEntities(recipe2, context);
Console.WriteLine("\nAfter Related Entities are Deleted...");
ShowRecipes();
}
}
static void ShowRecipes()
{
using (var context = new EFRecipesEntities())
{
foreach (var recipe in context.Recipes)
{
Console.WriteLine("\n*** {0} ***", recipe.RecipeName);
Console.WriteLine("Ingredients");
foreach (var ingredient in recipe.Ingredients)
{
Console.WriteLine("\t{0}", ingredient.Name);
}
Console.WriteLine("Steps");
foreach (var step in recipe.Steps)
{
Console.WriteLine("\t{0}", step.Description);
}
}
}
}
