C# GridView 排序及分页

C# GridView 排序及分页

如果你在GridView控件上设置 AllowPaging="true" or AllowSorting="true" 而没有使用使用数据源控件 DataSource (i.e. SqlDataSource, ObjectDataSource),运行则会出现下列错误：

当你在GridView控件上单击下一页时：

The GridView 'GridViewID' fired event PageIndexChanging which wasn't handled.

当你点击排序时，则回出现：

The GridView 'GridViewID' fired event Sorting which wasn't handled.

如果你没有设置GridView的DataSourceID 的属性，你必须添加一个操作才可以排序及分页。。


  点这里查看下面的例子

<% @ Page Language="C#"  %>

<% @ Import Namespace="System.Data"  %>

<% @ Import Namespace="System.Data.OleDb"  %>

 

< script  runat ="server" >     

    private void PopulatePublishersGridView()

    {

        string connectionString = AccessConnectionString();

        OleDbConnection accessConnection = new OleDbConnection(connectionString);

 

        string sqlQuery = "SELECT [PubID], [Name], [Company Name], [Address], [City], [State], [Zip], [Telephone], [Fax], [Comments] FROM Publishers ORDER BY [Name] ASC;";

 

        OleDbCommand accessCommand = new OleDbCommand(sqlQuery, accessConnection);

 

        OleDbDataAdapter publishersDataAdapter = new OleDbDataAdapter(accessCommand);

        DataTable publishersDataTable = new DataTable("Publishers");

        publishersDataAdapter.Fill(publishersDataTable);

 

        int dataTableRowCount = publishersDataTable.Rows.Count;

 

        if (dataTableRowCount > 0)

        {

            gridViewPublishers.DataSource = publishersDataTable;

            gridViewPublishers.DataBind();

        }

    }

 

    private string AccessConnectionString()

    {

        string accessDatabasePath = Server.MapPath("~/App_Data/biblio.mdb");

        return String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};", accessDatabasePath);

    }

 

    private string GridViewSortDirection

    {

        get { return ViewState["SortDirection"] as string ?? "ASC"; }

        set { ViewState["SortDirection"] = value; }

    }

 

    private string GridViewSortExpression

    {

        get { return ViewState["SortExpression"] as string ?? string.Empty; }

        set { ViewState["SortExpression"] = value; }

    }

 

    private string GetSortDirection()

    {

        switch (GridViewSortDirection)

        {

            case "ASC":

                GridViewSortDirection = "DESC";

                break;

 

            case "DESC":

                GridViewSortDirection = "ASC";

                break;

        }

 

        return GridViewSortDirection;

    }

 

    protected void gridViewPublishers_PageIndexChanging(object sender, GridViewPageEventArgs e)

    {

        gridViewPublishers.DataSource = SortDataTable(gridViewPublishers.DataSource as DataTable, true);

        gridViewPublishers.PageIndex = e.NewPageIndex;

        gridViewPublishers.DataBind();

    }

 

    protected DataView SortDataTable(DataTable dataTable, bool isPageIndexChanging)

    {

        if (dataTable != null)

        {

            DataView dataView = new DataView(dataTable);

            if (GridViewSortExpression != string.Empty)

            {

                if (isPageIndexChanging)

                {

                    dataView.Sort = string.Format("{0} {1}", GridViewSortExpression, GridViewSortDirection);

                }

                else

                {

                    dataView.Sort = string.Format("{0} {1}", GridViewSortExpression, GetSortDirection());

                }

            }

            return dataView;

        }

        else

        {

            return new DataView();

        }

    }

 

    protected void gridViewPublishers_Sorting(object sender, GridViewSortEventArgs e)

    {

        GridViewSortExpression = e.SortExpression;

        int pageIndex = gridViewPublishers.PageIndex;

        gridViewPublishers.DataSource = SortDataTable(gridViewPublishers.DataSource as DataTable, false);

        gridViewPublishers.DataBind();

        gridViewPublishers.PageIndex = pageIndex;

    }

 

    protected void Page_Load(object sender, EventArgs e)

    {

        PopulatePublishersGridView();

    }

 

</ script >


 

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

< html  xmlns ="http://www.w3.org/1999/xhtml" >

< head  runat ="server" >

     < title > GridView Sorting/Paging without a DataSourceControl DataSource </ title >

</ head >

< body >

     < form  id ="form"  runat ="server" >

         < div >

             < asp:GridView  ID ="gridViewPublishers"  AllowPaging ="true"  AllowSorting ="true"  AutoGenerateColumns ="false"

                EmptyDataText ="No records found"  PagerSettings-Mode ="NumericFirstLast"  PageSize ="25"

                OnPageIndexChanging ="gridViewPublishers_PageIndexChanging"  OnSorting ="gridViewPublishers_Sorting"

                runat ="server" >

                 < AlternatingRowStyle  BackColor ="LightGray"   />

                 < HeaderStyle  BackColor ="Gray"  Font-Bold ="true"  Font-Names ="Verdana"  Font-Size ="Small"   />

                 < PagerStyle  BackColor ="DarkGray"  Font-Names ="Verdana"  Font-Size ="Small"   />

                 < RowStyle  Font-Names ="Verdana"  Font-Size ="Small"   />

                 < Columns >

                     < asp:BoundField  DataField ="PubID"  HeaderText ="Publisher ID"  SortExpression ="PubID"   />

                     < asp:BoundField  DataField ="Name"  HeaderText ="Name"  SortExpression ="Name"   />

                     < asp:BoundField  DataField ="Company Name"  HeaderText ="Company Name"  SortExpression ="Company Name"   />

                     < asp:BoundField  DataField ="Address"  HeaderText ="Address"  SortExpression ="Address"   />

                     < asp:BoundField  DataField ="City"  HeaderText ="City"  SortExpression ="City"   />

                     < asp:BoundField  DataField ="State"  HeaderText ="State"  SortExpression ="State"   />

                     < asp:BoundField  DataField ="Zip"  HeaderText ="Zip"  SortExpression ="Zip"   />

                     < asp:BoundField  DataField ="Telephone"  HeaderText ="Telephone"  SortExpression ="Telephone"   />

                     < asp:BoundField  DataField ="Fax"  HeaderText ="Fax"  SortExpression ="Fax"   />

                     < asp:BoundField  DataField ="Comments"  HeaderText ="Comments"  SortExpression ="Comments"   />

                 </ Columns >

             </ asp:GridView >

         </ div >

     </ form >

</ body >

</ html >