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我有以下方法试图更新数据库表(运输成本)中的单个列(不是对象的整个图形!):实体框架6-无法更新表中的单个列
public void UpdateShippingCost(Entities.ShoppingCart shoppingCart)
{
// Map from domain entity to database object
var shoppingCartRecord = Mapper.Map<ShoppingCart>(shoppingCart);
shoppingCartRecord.ShippingCost = 99.99M;
dbContext.ShoppingCart.Add(shoppingCartRecord);
var entry = dbContext.Entry(shoppingCartRecord);
entry.Property(e => e.ShippingCost).IsModified = true;
dbContext.SaveChanges();
}
在执行entry.Property(e => e.ShippingCost).IsModified = true;
线,我得到以下错误:
Additional information: SetModifiedProperty cannot be called because the object is not in a modified or unchanged state.
怎么能这样呢?我当然修改了这个对象。
在您请求实体条目之前调用'Add()'。我猜这个对象的确处于'Added'状态。当整个对象将被保存为'Added'时,将其中一个属性标记为'Modified'的意义何在? – haim770