以下写了一个简单的例子,用缓存来作为 ViewState 存储目的地。至于缓存的 Key,文中给出的只是一个简单的写法,具体可以根据情况给出严密的方案。
代码大致演示如下:
<%@ Page language="c#" Codebehind="SaveViewStateToOther.aspx.cs" AutoEventWireup="false" Inherits="LinkedList.SaveViewStateToOther" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > <html> <head> <title>SaveViewStateToOther</title> <**** name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <**** name="CODE_LANGUAGE" Content="C#"> <**** name=vs_defaultClient****** content="java******"> <**** name=vs_targetSchema content="http://schemas.microsoft.com/intellisense/ie5"> </head> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"><asp:DataGrid id=DataGrid1 style="Z-INDEX: 101; LEFT: 104px; POSITION: absolute; TOP: 72px" runat="server" BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px" BackColor="White" CellPadding="4" PageSize="6" AllowPaging="True"> <selecteditemstyle font-bold="True" forecolor="#CCFF99" backcolor="#009999"> </SelectedItemStyle> <itemstyle forecolor="#003399" backcolor="White"> </ItemStyle> <headerstyle font-bold="True" forecolor="#CCCCFF" backcolor="#003399"> </HeaderStyle> <footerstyle forecolor="#003399" backcolor="#99CCCC"> </FooterStyle> <pagerstyle horizontalalign="Left" forecolor="#003399" backcolor="#99CCCC" pagebuttoncount="20" mode="NumericPages"> </PagerStyle> </asp:DataGrid> </form> </body> </html>
using System; using System.Data; using System.IO; using System.Text; using System.Web.UI; using System.Web.UI.WebControls; namespace LinkedList { /// <summary> /// SaveViewStateToOther 的摘要说明。 /// </summary> public class SaveViewStateToOther : Page { protected DataGrid DataGrid1; private void Page_Load(object sender, EventArgs e) { if (!IsPostBack) Bind(); } private void Bind() { DataTable table = new DataTable(); table.Columns.Add("id", typeof (int)); table.Columns.Add("name", typeof (string)); for (int i = 0; i < 1000; i++) { DataRow row = table.NewRow(); row["id"] = i; row["name"] = "student_" + i.ToString(); table.Rows.Add(row); } DataGrid1.DataSource = table; DataGrid1.DataBind(); } #region Web 窗体设计器生成的代码 protected override void OnInit(EventArgs e) { InitializeComponent(); base.OnInit(e); } private void InitializeComponent() { this.DataGrid1.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid1_PageIndexChanged); this.Load += new System.EventHandler(this.Page_Load); } #endregion protected override void SavePageStateToPersistenceMedium(object viewState) { LosFormatter format = new LosFormatter(); StringWriter writer = new StringWriter(); format.Serialize(writer, viewState); string vsRaw = writer.ToString(); byte[] buffer = Convert.FromBase64String(vsRaw); string vsText = Encoding.ASCII.GetString(buffer); object v = Cache[PageKey]; if (v == null) Cache.Insert(PageKey, vsText); else Cache[PageKey] = vsText; } public string PageKey { get { return Session.SessionID + "_page_SaveViewStateToOther_aspx"; } } protected override object LoadPageStateFromPersistenceMedium() { object s = Cache[PageKey]; if (s != null) { string state = s.ToString(); byte[] buffer = Encoding.ASCII.GetBytes(state); string vsRaw = Convert.ToBase64String(buffer); LosFormatter formatter = new LosFormatter(); return formatter.Deserialize(vsRaw); } return null; } private void DataGrid1_PageIndexChanged(object source, DataGridPageChangedEventArgs e) { DataGrid1.CurrentPageIndex = e.NewPageIndex; Bind(); } } }
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