1
我有一个List<T>
绑定到一个数据网格,并试图找出如何保存对数据库的所有更改(使用实体框架),而不是一次一行;或者,至少有一种更好的方式可以将更改从数据网格提交到数据库。我正在使用MVVM模式。 这里是我尽可能节省一行:数据网格上的实体框架CRUD操作
private static PROJECT_EXPENSEEntities _service;
//The default constructor
public ProjectExpenseItemsRepository()
{
if (_service == null)
{
_service = new PROJECT_EXPENSEEntities();
}
}
public void AddProjectExpenseItems(int projectExpenseID)
{
project_expense_items p = new project_expense_items();
if (entityList != null)
{
p.project_expense_id = projectExpenseID;
p.item_number = entityList.ItemNumber;
p.item_description = entityList.ItemDescription;
p.item_unit_price = entityList.ItemUnitPrice;
p.item_qty = entityList.ItemQty;
p.supplier_name = entityList.SupplierName;
p.create_date = System.DateTime.Today;
_service.AddObject("project_expense_items", p);
_service.SaveChanges();
}
}
不过,我宁愿在DataGrid更改发送到所有行一次:
public void AddProjectExpenseItems(List<ProjectExpenseItemsBO> entityList, int projectExpenseID)
{
project_expense_items p = new project_expense_items();
if (entityList != null)
{
// not sure what goes here, do I need a loop for each item in the list?
// I have a feeling I am going in the wrong direction with this...
_service.AddObject("project_expense_items", entityList);
_service.SaveChanges();
}
}
我还没有发现网络上有很多很好的例子。如果有人能指出我的例子,我会很感激。
如果你正在使用RIA有一个简单的方法来做这件事。只需调用DomainContext类的SubmitChanges。 – 2011-11-09 18:27:15