???????? 使用實現起來雖然比較方便，但是效率不高，每次都需要讀取所有頁（整個記錄集），而加載的只是其中一頁，造成了資源的浪費，記錄多又會使效率變得很低。下面通過DataGrid的自定義分頁功能來減少資源使用和提高效率。

???????? 實現的關鍵是設置AllowCustomPaging屬性位True,并把VirtualItemCount屬性設置位總的記錄數，給分頁提供依據，前臺的主要代碼如下：

<form id="Form1" method="post" runat="server">

??????????????????????????? <TABLE id="Table1" style="FONT-SIZE: 9pt" cellSpacing="1" cellPadding="1" width="450" align="center"

???????????????????????????????????? border="1">

???????????????????????????????????? <TR>

?????????????????????????????????????????????? <TD>

??????????????????????????????????????????????????????? <asp:datagrid id="DataGrid1" runat="server" Width="100%" AllowPaging="True" AllowCustomPaging="True">

???????????????????????????????????????????????????????????????? <PagerStyle Font-Size="9pt" Mode="NumericPages"></PagerStyle>

??????????????????????????????????????????????????????? </asp:datagrid></TD>

???????????????????????????????????? </TR>

??????????????????????????? </TABLE>

?????????????????? </form>

這里使用的數據源還是假設為Northwind的Customers表。

下面是訪問單頁的存儲過程，實現方式很多，不過這個是最普通的，

CREATE PROCEDURE [GetCustomersDataPage]

???????? @PageIndex INT,

???????? @PageSize? INT,

???????? @RecordCount INT OUT,

???????? @PageCount INT OUT

AS

SELECT @RecordCount = COUNT(*)? FROM?? Customers

SET @PageCount = CEILING(@RecordCount * 1.0 / @PageSize)

DECLARE @SQLSTR NVARCHAR(1000)

IF @PageIndex = 0 OR @PageCount <= 1

???????? SET @SQLSTR =N'SELECT TOP '+STR( @PageSize )+

'? CustomerID, CompanyName,Address,Phone? FROM?? Customers ORDER BY CustomerID DESC'

ELSE IF???? @PageIndex = @PageCount - 1????????????

???????? SET @SQLSTR =N' SELECT * FROM ( SELECT TOP '+STR( @RecordCount - @PageSize * @PageIndex )+

'? CustomerID, CompanyName,Address,Phone? FROM?? Customers ORDER BY CustomerID ASC ) TempTable? ORDER BY CustomerID DESC'

ELSE?????????

??????? SET @SQLSTR =N' SELECT TOP? '+STR( @PageSize )+' * FROM ( SELECT TOP '+STR( @RecordCount - @PageSize * @PageIndex )+

'? CustomerID, CompanyName,Address,Phone? FROM?? Customers ORDER BY CustomerID ASC ) TempTable ORDER BY CustomerID DESC'

EXEC (@SQLSTR)

GO

獲取記錄數和頁數都采用存儲過程的輸出參數。

獲取數據源，這里返回一個DataSet。

先定義了連個數據成員，

private int pageCount;//頁數

private int recordCount;//記錄數

//獲取單頁數據

private static DataSet GetCustomersData(int pageIndex,int pageSize,ref int recordCount,ref int pageCount)

{

???? string connString = ConfigurationSettings.AppSettings["ConnString"];

???? SqlConnection conn = new SqlConnection(connString);

???? SqlCommand comm = new SqlCommand("GetCustomersDataPage",conn);

???? comm.Parameters.Add(new SqlParameter("@PageIndex",SqlDbType.Int));

???? comm.Parameters[0].Value = pageIndex;

???? comm.Parameters.Add(new SqlParameter("@PageSize",SqlDbType.Int));

???? comm.Parameters[1].Value = pageSize;

???? comm.Parameters.Add(new SqlParameter("@RecordCount",SqlDbType.Int));

???? comm.Parameters[2].Direction = ParameterDirection.Output;

???? comm.Parameters.Add(new SqlParameter("@PageCount",SqlDbType.Int));

???? comm.Parameters[3].Direction = ParameterDirection.Output;

???? comm.CommandType = CommandType.StoredProcedure;

???? SqlDataAdapter dataAdapter = new SqlDataAdapter(comm);

???? DataSet ds = new DataSet();

???? dataAdapter.Fill(ds);

???? recordCount = (int)comm.Parameters[2].Value;

???? pageCount = (int)comm.Parameters[3].Value;

???? return ds;

}

//綁定數據到DataGrid，同時刷新數據總記錄數

private void DataGridDataBind()

{

???? DataSet ds = GetCustomersData(PageIndex,PageSize,ref recordCount,ref pageCount);

???? this.DataGrid1.VirtualItemCount = RecordCount;

???? this.DataGrid1.DataSource = ds;

???? this.DataGrid1.DataBind();

}

下面是分頁的幾個變量屬性

public int PageCount

{

???? get{return this.DataGrid1.PageCount;}

}

public int PageSize

{

???? get{return this.DataGrid1.PageSize;}

}

public int PageIndex

{

???? get{return this.DataGrid1.CurrentPageIndex;}

???? set{this.DataGrid1.CurrentPageIndex = value;}

}

public int RecordCount

{

???? get{return recordCount;}

}

注冊DataGrid分頁事件

//分頁事件處理

private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)

{

???? DataGrid dg = (DataGrid)source;

???? dg.CurrentPageIndex = e.NewPageIndex;

???? DataGridDataBind();

}

最好判斷當前頁面是否是第一次加載，防止重復加載兩次數據，

private void Page_Load(object sender, System.EventArgs e)

{

???? if(!Page.IsPostBack)

???? {

???????? DataGridDataBind();

???? }

}

顯示界面如下：

這個例子中沒有顯示分頁的一些參數，我們可以進一步對其進行改進。

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