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[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。 為了測試工作.Skip()
,我從LINQ查詢中刪除了.Skip()
,並按我的預期進行了分頁。
我的數據分頁有點混亂。 當我單擊第2頁時,重新綁定數據源將完全刪除第一頁數據。
因此,最初返回14行,頁面大小為10行,因此我可以單擊第2頁,在此我可以正確看到剩余的4行,但是現在我無法再進行頁面操作,因為之前的10行已從數據源中刪除。
這是我的代碼:
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();
}
如何保留整個數據源,但僅顯示與所選頁面相對應的數據源?
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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