internal static int Create()
{
using (AdventureWorks adventureWorks = new AdventureWorks())
{
ProductCategory category = new ProductCategory()
{
Name = "Category"
};
ProductSubcategory subcategory = new ProductSubcategory()
{
Name = "Subcategory"
};
category.ProductSubcategories.Add(subcategory);
adventureWorks.ProductCategories.InsertOnSubmit(category);
Trace.WriteLine(category.ProductCategoryID); // 0.
Trace.WriteLine(subcategory.ProductCategoryID); // null.
Trace.WriteLine(subcategory.ProductSubcategoryID); // 0.
adventureWorks.SubmitChanges();
Trace.WriteLine(category.ProductCategoryID); // 5.
Trace.WriteLine(subcategory.ProductCategoryID); // 5.
Trace.WriteLine(subcategory.ProductSubcategoryID); // 38.
return(subcategory.ProductSubcategoryID);
}
}
internal static void DeleteWithRelationship()
{
Create(); // Insert ProductCategory "Category" and ProductSubcategory "Subcategory".
using (AdventureWorks adventureWorks = new AdventureWorks())
{
ProductCategory category = adventureWorks.ProductCategories
.Single(entity => entity.Name == "Category");
ProductSubcategory subcategory = adventureWorks.ProductSubcategories
.Single(entity => entity.Name == "Subcategory");
adventureWorks.ProductCategories.DeleteOnSubmit(category);
adventureWorks.ProductSubcategories.DeleteOnSubmit(subcategory);
adventureWorks.SubmitChanges();
}
}
internal static void DeleteWithNoQuery(int subcategoryId)
{
ProductSubcategory subcategory = new ProductSubcategory()
{
ProductSubcategoryID = subcategoryId
};
using (AdventureWorks adventureWorks = new AdventureWorks())
{
adventureWorks.ProductSubcategories.Attach(subcategory, false);
adventureWorks.ProductSubcategories.DeleteOnSubmit(subcategory);
adventureWorks.SubmitChanges();
}
}
internal static void Update()
{
using (AdventureWorks adventureWorks = new AdventureWorks())
{
ProductCategory category = adventureWorks.ProductCategories.First();
ProductSubcategory subcategory = adventureWorks.ProductSubcategories
.Single(entity => entity.Name == "Subcategory");
Trace.WriteLine(subcategory.Name); // Subcategory.
Trace.WriteLine(subcategory.ProductCategoryID); // 5.
subcategory.Name = "Update"; // Update property.
subcategory.ProductCategory = category; // Update association.
adventureWorks.SubmitChanges();
Trace.WriteLine(subcategory.Name); // Subcategory update.
Trace.WriteLine(subcategory.ProductCategoryID); // 4.
}
}
internal static void Default()
{
using (AdventureWorks adventureWorks = new AdventureWorks())
{
ProductCategory category = adventureWorks.ProductCategories.First();
Trace.WriteLine(category.Name); // Accessories.
category.Name = "Update";
ProductSubcategory subcategory = adventureWorks.ProductSubcategories.First();
Trace.WriteLine(subcategory.ProductCategoryID); // 1.
subcategory.ProductCategoryID = -1;
try
{
adventureWorks.SubmitChanges();
}
catch (SqlException exception)
{
Trace.WriteLine(exception);
// SqlException: The UPDATE statement conflicted with the FOREIGN KEY constraint "FK_ProductSubcategory_ProductCategory_ProductCategoryID". The conflict occurred in database "D:\ONEDRIVE\WORKS\DRAFTS\CODESNIPPETS\DATA\ADVENTUREWORKS_DATA.MDF", table "Production.ProductCategory", column 'ProductCategoryID'. The statement has been terminated.
adventureWorks.Refresh(RefreshMode.OverwriteCurrentValues, category, subcategory);
Trace.WriteLine(category.Name); // Accessories.
Trace.WriteLine(subcategory.ProductCategoryID); // 1.
}
}
}
