我从一个实体对象填充一个网格,它正在显示数据.当我进行更改并将其保存回来时,没有任何更新.
这是我的代码：
在我的载入事件中：
var query = from c in _entities.PaymentTypes
where c.CorporationId == _currentcorp.CorporationId
select
new DataBindingProjection
{
PaymentTypeId = c.PaymentTypeId,CorporationId = c.CorporationId,TokenId = c.TokenId,IsActive = c.IsActive,Description = c.Description,CashChargeCodeType = c.CashChargeCodeType,SortOrder = c.SortOrder,ExcludeCreditCode = c.ExcludeCreditCodes,IsUpdated = c.IsUpdated,IsAdded = c.IsAdded,ClearUpdatedAndAdded = c.ClearUpdateAndAdded
};
dataGridView_PaymentTypes.DataSource = query.ToList();
我的课：
private class DataBindingProjection
{
public Guid PaymentTypeId { get; set; }
public Guid CorporationId { get; set; }
public Guid TokenId { get; set; }
public bool IsActive { get; set; }
public string Description { get; set; }
public int CashChargeCodeType { get; set; }
public int SortOrder { get; set; }
public int ExcludeCreditCode { get; set; }
public bool IsUpdated { get; set; }
public bool IsAdded { get; set; }
public bool ClearUpdatedAndAdded { get; set; }
}
在按钮中保存更改：
private void button_SaveChanges2_Click(object sender,EventArgs e)
{
button_SaveChanges2.Enabled = false;
_entities.SaveChanges();
timer1.Enabled = true;
button_SaveChanges2.Enabled = true;
}
我究竟做错了什么？
响应bmused：
定义在班级：
private SuburbanPortalEntities _entities;
在我的负载中定义：
var bs = new BindingSource(); _entities.PaymentTypes.Where(x => x.CorporationId == _currentcorp.CorporationId).Load; bs.DataSource = _entities.PaymentTypes.Local.ToBindingList(); dataGridView_PaymentTypes.DataSource = bs;
它显示它无法加载符号加载和本地：
解决方法@H_403_32@
可以通过从DbContext Local ObservableCollection< T>创建IBindingList来实现具有Winforms和Entity Framework的双向数据绑定.并将其设置为BindingSource的DataSource.例：
private BindingSource bs = new BindingSource();
private MyDbContext context = new MyDbContext();
context.MyEntities.Where(x=>x.SomeProperty == 2).Load();
bs.DataSource = context.MyEntities.Local.ToBindingList();
myDataGridView.DataSource = bs;
private BindingSource bs = new BindingSource(); private MyDbContext context = new MyDbContext(); context.MyEntities.Where(x=>x.SomeProperty == 2).Load(); bs.DataSource = context.MyEntities.Local.ToBindingList(); myDataGridView.DataSource = bs;
