static Donator GetDonator(int id)
{
using (var db = new Context.Context())
{
return(db.Donators.Find(id));
}
}
static void UpdateDonator(Donator donator)
{
using (var db = new Context.Context())
{
db.Entry(donator).State = EntityState.Modified;
db.SaveChanges();
}
}
static void UpdateDonatorEnhanced(Donator originalDonator, Donator newDonator)
{
using (var db = new Context.Context())
{
//从数据库中检索最新的模型
var donator = db.Donators.Find(originalDonator.Id);
//接下来检查用户修改的每个属性
if (originalDonator.Name != newDonator.Name)
{
//将新值更新到数据库
donator.Name = newDonator.Name;
}
if (originalDonator.Amount != newDonator.Amount)
{
//将新值更新到数据库
donator.Amount = newDonator.Amount;
}
//这里省略其他属性...
db.SaveChanges();
}
}
