实现高效分页的方法

 1 < script runat = server >
 2 SqlConnection conNorthwind;
 3 string   strSelect;
 4 int  intStartIndex;
 5 int  intEndIndex;
 6
 7 void  Page_Load(Object sender , EventArgs e) 
 8 {
 9    SqlCommand cmdSelect;
10
11    conNorthwind = new SqlConnection( @"Server=localhost;Integrated Security=SSPI;Database=Northwind" );
12    
13    if (! IsPostBack ) 
14    {
15        // Get  Total Pages
16        strSelect = "Select Count(*) From Products";
17        cmdSelect = new SqlCommand( strSelect, conNorthwind );
18        conNorthwind.Open();
19        dgrdProducts.VirtualItemCount = ( (int)cmdSelect.ExecuteScalar() / dgrdProducts.PageSize );
20        conNorthwind.Close();
21        BindDataGrid();
22    }
23}
24
25 void  BindDataGrid () 
26 {
27    SqlDataAdapter dadProducts;
28    DataSet dstProducts;
29
30    intEndIndex = intStartIndex + dgrdProducts.PageSize;
31    strSelect = "Select * From Products Where ProductID > @startIndex And ProductID <= @endIndex Order By ProductID";
32    dadProducts = new SqlDataAdapter( strSelect, conNorthwind );
33    dadProducts.SelectCommand.Parameters.Add( "@startIndex", intStartIndex );
34    dadProducts.SelectCommand.Parameters.Add( "@endIndex", intEndIndex );
35    dstProducts = new DataSet();
36    dadProducts.Fill( dstProducts );
37
38    dgrdProducts.DataSource = dstProducts;
39    dgrdProducts.DataBind();
40}
41
42 void  dgrdProducts_PageIndexChanged(  object  s, DataGridPageChangedEventArgs e )  {
43    intStartIndex = ( e.NewPageIndex * dgrdProducts.PageSize );
44    dgrdProducts.CurrentPageIndex = e.NewPageIndex;
45    BindDataGrid();
46}
47
48 </ Script >
49
50 < html >
51 < head >< title > DataGridCustomPaging.aspx </ title ></ head >
52 < body >
53 < form Runat = " Server " >
54
55 < asp:DataGrid
56   ID = " dgrdProducts "
57   AllowPaging = " True "
58   AllowCustomPaging = " True "
59   PageSize = " 3 "
60   OnPageIndexChanged = " dgrdProducts_PageIndexChanged "
61   PagerStyle - Mode = " NumericPages "
62   CellPadding = " 3 "
63   Runat = " Server "   />
64
65 </ form >
66 </ body >
67 </ html >
68

使用条件：要有一个主键列(ProductID)。