public virtual void Update(T entity)
{
try
{
if (entity == null)
{
throw new ArgumentNullException(nameof(entity));
}
_context.Set <T>().Update(entity);
_context.SaveChanges();
}
catch (DbEntityValidationException dbEx)
{
throw new Exception(dbEx.Message);
}
}
// Use at PopulationChart.cshtml >LoadData >url: "/Home/PopulationData"
public JsonResult PopulationData()
{
using (var context = new PopulationDbContext())
{
// Clear and reset database
context.Database.EnsureDeleted();
// Create database if it does not exist
context.Database.EnsureCreated();
// Add records: Id is autoincremented by default
context.PopulationDbSet.Add(new PopulationModel {
CityName = "City-1", PopulationYear2010 = 3000, PopulationYear2000 = 1000
});
context.PopulationDbSet.Add(new PopulationModel {
CityName = "City-2", PopulationYear2010 = 2500, PopulationYear2000 = 1500
});
context.PopulationDbSet.Add(new PopulationModel {
CityName = "City-3", PopulationYear2010 = 2000, PopulationYear2000 = 2000
});
context.PopulationDbSet.Add(new PopulationModel {
CityName = "City-4", PopulationYear2010 = 1500, PopulationYear2000 = 2500
});
context.PopulationDbSet.Add(new PopulationModel {
CityName = "City-5", PopulationYear2010 = 1000, PopulationYear2000 = 3000
});
// Commit changes
context.SaveChanges();
// Fetch all Population
var list = new List <PopulationModel>();
foreach (var population in context.PopulationDbSet.ToList())
{
list.Add(new PopulationModel
{
CityName = population.CityName,
PopulationYear2010 = population.PopulationYear2010,
PopulationYear2000 = population.PopulationYear2000
});
}
return(Json(list));
}
}