[英]Storing records in a dropdownlist from DB without using LINQ Data source
[英]Data paging in linq without removing records from the data source
不需要答案。 为了测试工作.Skip()
,我从LINQ查询中删除了.Skip()
,并按我的预期进行了分页。
我的数据分页有点混乱。 当我单击第2页时,重新绑定数据源将完全删除第一页数据。
因此,最初返回14行,页面大小为10行,因此我可以单击第2页,在此我可以正确看到剩余的4行,但是现在我无法再进行页面操作,因为之前的10行已从数据源中删除。
这是我的代码:
private void LoadVouchers(int page)
{
var ViewModel = new List<ListVouchersViewModel>();
var PageSize = gvVouchers.PageSize; // Value = 10.
var Skip = page * PageSize; // Value = 1 * 10 = 10 so skip 10 rows.
int SupplierId = int.TryParse(hdSupplierId.Value, out SupplierId) ? SupplierId : 0;
using (ApplicationDbContext Context = new ApplicationDbContext())
{
var Vouchers = Context.Vouchers.Where(x => x.SupplierId == SupplierId && !x.Deleted)
.OrderBy(x => x.DateIssued)
.Skip(Skip);
foreach (var Voucher in Vouchers)
{
// Add a new ListVoucherViewModel to the list.
}
}
gvVouchers.DataSource = ViewModel;
gvVouchers.DataBind();
}
如何保留整个数据源,但仅显示与所选页面相对应的数据源?
private void LoadVouchers(int page)
{
var ViewModel = new List<ListVouchersViewModel>();
var PageSize = gvVouchers.PageSize; // Value = 10.
var Skip = page * PageSize; // Value = 1 * 10 = 10 so skip 10 rows.
int SupplierId = int.TryParse(hdSupplierId.Value, out SupplierId) ? SupplierId : 0;
int totalRowCount = 0;
using (ApplicationDbContext Context = new ApplicationDbContext())
{
totalRowCount = Context.Vouchers.Count();
var Vouchers = Context.Vouchers.Where(x => x.SupplierId == SupplierId && !x.Deleted)
.OrderBy(x => x.DateIssued)
.Skip(Skip);
foreach (var Voucher in Vouchers)
{
// Add a new ListVoucherViewModel to the list.
}
}
gvVouchers.DataSource = ViewModel;
gvVouchers.VirtualItemCount = totalRowCount;
gvVouchers.PageIndex = page;
gvVouchers.DataBind();
}
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