126 lines
3.7 KiB
C#
126 lines
3.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Web;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Data;
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using System.Text;
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using Newtonsoft.Json;
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using Newtonsoft.Json.Linq;
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namespace FineUI.Examples.grid
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{
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public partial class grid_paging_selection : PageBase
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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if (!IsPostBack)
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{
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BindGrid();
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}
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}
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#region LoadData
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private void BindGrid()
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{
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DataTable table = DataSourceUtil.GetDataTable2();
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Grid1.DataSource = table;
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Grid1.DataBind();
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}
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#endregion
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#region Events
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protected void Button1_Click(object sender, EventArgs e)
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{
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SyncSelectedRowIndexArrayToHiddenField();
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labResult.Text = "选中行的ID列表为：" + hfSelectedIDS.Text.Trim();
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}
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protected void Grid1_PageIndexChange(object sender, GridPageEventArgs e)
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{
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SyncSelectedRowIndexArrayToHiddenField();
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Grid1.PageIndex = e.NewPageIndex;
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UpdateSelectedRowIndexArray();
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}
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private List<string> GetSelectedRowIndexArrayFromHiddenField()
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{
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JArray idsArray = new JArray();
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string currentIDS = hfSelectedIDS.Text.Trim();
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if (!String.IsNullOrEmpty(currentIDS))
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{
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idsArray = JArray.Parse(currentIDS);
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}
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else
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{
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idsArray = new JArray();
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}
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return new List<string>(idsArray.ToObject<string[]>());
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}
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private void SyncSelectedRowIndexArrayToHiddenField()
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{
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List<string> ids = GetSelectedRowIndexArrayFromHiddenField();
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List<int> selectedRows = new List<int>();
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if (Grid1.SelectedRowIndexArray != null && Grid1.SelectedRowIndexArray.Length > 0)
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{
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selectedRows = new List<int>(Grid1.SelectedRowIndexArray);
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}
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int startPageIndex = Grid1.PageIndex * Grid1.PageSize;
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for (int i = startPageIndex, count = Math.Min(startPageIndex + Grid1.PageSize, Grid1.RecordCount); i < count; i++)
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{
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string id = Grid1.DataKeys[i][0].ToString();
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if (selectedRows.Contains(i - startPageIndex))
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{
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if (!ids.Contains(id))
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{
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ids.Add(id);
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}
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}
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else
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{
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if (ids.Contains(id))
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{
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ids.Remove(id);
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}
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}
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}
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hfSelectedIDS.Text = new JArray(ids).ToString(Formatting.None);
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}
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private void UpdateSelectedRowIndexArray()
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{
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List<string> ids = GetSelectedRowIndexArrayFromHiddenField();
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List<int> nextSelectedRowIndexArray = new List<int>();
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int nextStartPageIndex = Grid1.PageIndex * Grid1.PageSize;
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for (int i = nextStartPageIndex, count = Math.Min(nextStartPageIndex + Grid1.PageSize, Grid1.RecordCount); i < count; i++)
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{
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string id = Grid1.DataKeys[i][0].ToString();
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if (ids.Contains(id))
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{
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nextSelectedRowIndexArray.Add(i - nextStartPageIndex);
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}
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}
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Grid1.SelectedRowIndexArray = nextSelectedRowIndexArray.ToArray();
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}
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#endregion
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}
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}
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