using System; using System.Collections.Generic; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data; using System.Text; using Newtonsoft.Json.Linq; using Newtonsoft.Json; namespace FineUI.Examples.grid { public partial class grid_paging_database_selection : PageBase { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { BindGrid(); } } #region BindGrid private void BindGrid() { // 1.设置总项数(特别注意:数据库分页一定要设置总记录数RecordCount) Grid1.RecordCount = GetTotalCount(); // 2.获取当前分页数据 DataTable table = GetPagedDataTable(Grid1.PageIndex, Grid1.PageSize); // 3.绑定到Grid Grid1.DataSource = table; Grid1.DataBind(); } /// /// 模拟返回总项数 /// /// private int GetTotalCount() { return GetDataTable2().Rows.Count; } /// /// 模拟数据库分页 /// /// private DataTable GetPagedDataTable(int pageIndex, int pageSize) { DataTable source = GetDataTable2(); DataTable paged = source.Clone(); int rowbegin = pageIndex * pageSize; int rowend = (pageIndex + 1) * pageSize; if (rowend > source.Rows.Count) { rowend = source.Rows.Count; } for (int i = rowbegin; i < rowend; i++) { paged.ImportRow(source.Rows[i]); } return paged; } #endregion #region Events protected void Button1_Click(object sender, EventArgs e) { SyncSelectedRowIndexArrayToHiddenField(); labResult.Text = "选中行的ID列表为:" + hfSelectedIDS.Text.Trim(); } protected void Grid1_PageIndexChange(object sender, FineUI.GridPageEventArgs e) { SyncSelectedRowIndexArrayToHiddenField(); Grid1.PageIndex = e.NewPageIndex; BindGrid(); UpdateSelectedRowIndexArray(); } private List GetSelectedRowIndexArrayFromHiddenField() { JArray idsArray = new JArray(); string currentIDS = hfSelectedIDS.Text.Trim(); if (!String.IsNullOrEmpty(currentIDS)) { idsArray = JArray.Parse(currentIDS); } else { idsArray = new JArray(); } return new List(idsArray.ToObject()); } private void SyncSelectedRowIndexArrayToHiddenField() { List ids = GetSelectedRowIndexArrayFromHiddenField(); List selectedRows = new List(); if (Grid1.SelectedRowIndexArray != null && Grid1.SelectedRowIndexArray.Length > 0) { selectedRows = new List(Grid1.SelectedRowIndexArray); } for (int i = 0, count = Math.Min(Grid1.PageSize, (Grid1.RecordCount - Grid1.PageIndex * Grid1.PageSize)); i < count; i++) { string id = Grid1.DataKeys[i][0].ToString(); if (selectedRows.Contains(i)) { if (!ids.Contains(id)) { ids.Add(id); } } else { if (ids.Contains(id)) { ids.Remove(id); } } } hfSelectedIDS.Text = new JArray(ids).ToString(Formatting.None); } private void UpdateSelectedRowIndexArray() { List ids = GetSelectedRowIndexArrayFromHiddenField(); List nextSelectedRowIndexArray = new List(); for (int i = 0, count = Math.Min(Grid1.PageSize, (Grid1.RecordCount - Grid1.PageIndex * Grid1.PageSize)); i < count; i++) { string id = Grid1.DataKeys[i][0].ToString(); if (ids.Contains(id)) { nextSelectedRowIndexArray.Add(i); } } Grid1.SelectedRowIndexArray = nextSelectedRowIndexArray.ToArray(); } #endregion } }