没有数据源控制的高效Gridview分页问题
我试图在不使用数据源控件的情况下使用gridview进行高效分页。 通过有效，我的意思是我只检索我打算显示的记录。
我正在尝试使用PagerTemplate来构建我的寻呼机function。
简而言之，问题是如果我只绑定我打算在当前页面上显示的记录，gridview不会呈现其寻呼机模板，所以我没有得到分页控件。
这几乎就像我必须绑定的记录多于我打算在给定页面上显示的记录，这不是我想要做的事情。
您需要创建一个inheritance自GridView的自定义gridview控件。 如果没有DataSourceControl，gridview就不知道可能绑定到控件的记录总数。 如果绑定100个记录中的10个并将PageSize属性设置为10，则gridview只知道有10个记录小于或等于PageSize，并且不会显示寻呼机控件。 为了使gridview显示寻呼机，它必须知道可能被检索的记录总数。 通过inheritancegridview并覆盖InitializePager方法，我们可以拦截pagedDataSource并修改AllowCustomPaging和VirtualCount方法。
这是我创造的那个
using System; using System.Collections.Generic; using System.Text; using System.Web.UI.WebControls; using System.ComponentModel; namespace cly.Web.CustomControls { public class clyGridView : GridView { private const string _virtualCountItem = "bg_vitemCount"; private const string _sortColumn = "bg_sortColumn"; private const string _sortDirection = "bg_sortDirection"; private const string _currentPageIndex = "bg_pageIndex"; public clyGridView () : base() { } #region Custom Properties [Browsable(true), Category("NewDynamic")] [Description("Set the virtual item count for this grid")] public int VirtualItemCount { get { if (ViewState[_virtualCountItem] == null) ViewState[_virtualCountItem] = -1; return Convert.ToInt32(ViewState[_virtualCountItem]); } set { ViewState[_virtualCountItem] = value; } } public string GridViewSortColumn { get { if (ViewState[_sortColumn] == null) ViewState[_sortColumn] = string.Empty; return ViewState[_sortColumn].ToString(); } set { if (ViewState[_sortColumn] == null || !ViewState[_sortColumn].Equals(value)) GridViewSortDirection = SortDirection.Ascending; ViewState[_sortColumn] = value; } } public SortDirection GridViewSortDirection { get { if (ViewState[_sortDirection] == null) ViewState[_sortDirection] = SortDirection.Ascending; return (SortDirection)ViewState[_sortDirection]; } set { ViewState[_sortDirection] = value; } } private int CurrentPageIndex { get { if (ViewState[_currentPageIndex] == null) ViewState[_currentPageIndex] = 0; return Convert.ToInt32(ViewState[_currentPageIndex]); } set { ViewState[_currentPageIndex] = value; } } private bool CustomPaging { get { return (VirtualItemCount != -1); } } #endregion #region Overriding the parent methods public override object DataSource { get { return base.DataSource; } set { base.DataSource = value; // store the page index so we don't lose it in the databind event CurrentPageIndex = PageIndex; } } protected override void OnSorting(GridViewSortEventArgs e) { //Store the direction to find out if next sort should be asc or desc SortDirection direction = SortDirection.Ascending; if (ViewState[_sortColumn] != null && (SortDirection)ViewState[_sortDirection] == SortDirection.Ascending) { direction = SortDirection.Descending; } GridViewSortDirection = direction; GridViewSortColumn = e.SortExpression; base.OnSorting(e); } protected override void InitializePager(GridViewRow row, int columnSpan, PagedDataSource pagedDataSource) { // This method is called to initialise the pager on the grid. We intercepted this and override // the values of pagedDataSource to achieve the custom paging using the default pager supplied if (CustomPaging) { pagedDataSource.VirtualCount = VirtualItemCount; pagedDataSource.CurrentPageIndex = CurrentPageIndex; } base.InitializePager(row, columnSpan, pagedDataSource); } protected override object SaveViewState() { //object[] state = new object[3]; //state[0] = base.SaveViewState(); //state[1] = this.dirtyRows; //state[2] = this.newRows; //return state; return base.SaveViewState(); } protected override void LoadViewState(object savedState) { //object[] state = null; //if (savedState != null) //{ // state = (object[])savedState; // base.LoadViewState(state[0]); // this.dirtyRows = (List)state[1]; // this.newRows = (List )state[2]; //} base.LoadViewState(savedState); } #endregion public override string[] DataKeyNames { get { return base.DataKeyNames; } set { base.DataKeyNames = value; } } public override DataKeyArray DataKeys { get { return base.DataKeys; } } public override DataKey SelectedDataKey { get { return base.SelectedDataKey; } } } } 然后，当您绑定数据时：
gv.DataSource = yourListOrWhatever gv.VirtualItemCount = numOfTotalRecords; gv.DataBind();