public void Update(NorthwindSystem.DataModels.HumanResources.Region region, List <NorthwindSystem.DataModels.HumanResources.Territory> territories)
{
if (region == null)
{
throw new ArgumentNullException("region", "region is null.");
}
if (territories == null)
{
throw new ArgumentNullException("territories", "territories is null.");
}
using (var dbContext = new HR.NorthwindHumanResources())
{
foreach (var item in territories)
{
var found = dbContext.Territories.Find(item.TerritoryID);
if (found != null)
{
/* NOTE:
* Pre-process the Territory IDs to see if they should be "synced" with the name/description.
* This will be the case if, in the original, the ID was the same as the description
*/
string foundTerritoryID = found.TerritoryID;
string foundTerritoryDescription = found.TerritoryDescription.Trim(); // HACK: Turns out, the column is nchar(50), not an nvarchar....
string itemTerritoryID = item.TerritoryID;
string itemTerritoryDescription = item.TerritoryDescription.Trim();
if (foundTerritoryID.Equals(foundTerritoryDescription) &&
!itemTerritoryID.Equals(itemTerritoryDescription))
{
item.TerritoryID = itemTerritoryDescription;
dbContext.Territories.Remove(found); // Because the PK has changed...
dbContext.Territories.Add(item); // Because the PK has changed...
}
}
}
dbContext.Entry(region).State = System.Data.EntityState.Modified;
dbContext.SaveChanges();
}
}
public int Add(HR.Region region)
{
if (region == null)
{
throw new ArgumentNullException("region", "region is null.");
}
using (var dbContext = new HR.NorthwindHumanResources())
{
/* NOTE:
* The TerritoryID column in Territories is a string - nvarchar(20) - rather than an integer.
* The existing data in Northwind Traders uses the zip code of the city/town as the TerritoryID.
* This sample just "simplifies" and assigns the territory description as the ID, since we're
* in Canada and we aren't using a single zip or postal code.
*/
foreach (var territory in region.Territories)
{
if (string.IsNullOrEmpty(territory.TerritoryID))
{
territory.TerritoryID = territory.TerritoryDescription;
}
}
/* NOTE:
* The RegionID column in Regions is an integer, but it is not an IDENTITY column.
* As such, we're simply going to get the next highest ID available.
*/
if (region.RegionID <= 0)
{
region.RegionID = dbContext.Regions.Max(item => item.RegionID) + 1;
}
dbContext.Regions.Add(region);
dbContext.SaveChanges();
return(region.RegionID);
}
}