ASP.NET在ControlState與ViewState的比較

2008-10-07

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ASP.NET

小弟在TechEd 2008聽了一堂有關開發asp.net效能的課程
一般網頁如果用ViewState來儲存控制項狀態,如果很多控制項,網頁的容量一定會變很大
所以要加快效能可以關閉使用ViewState來儲存

小弟在TechEd 2008聽了一堂有關開發asp.net效能的課程

一般網頁如果用ViewState來儲存控制項狀態,如果很多控制項,網頁的容量一定會變很大

所以要加快效能可以關閉使用ViewState來儲存

但如果UserControl的狀態不使用ViewState來儲存,要用什麼來存狀態呢,其實還有一個ControlState可以儲存

在msdn找到一個範例介紹給大家呀...

用ViewState存一個index值

ViewStateUserControl.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="ViewStateUserControl.ascx.cs" Inherits="ViewStateUserControl" %> <asp:Button ID="Button1" runat="server" Text="ViewState" />

ViewStateUserControl.ascx.cs

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class ViewStateUserControl : System.Web.UI.UserControl { protected void Page_Load(object sender, EventArgs e) { } public int Index { get { if (ViewState["indexValue"] == null) { ViewState["indexValue"] = 0; } return Convert.ToInt32(ViewState["indexValue"]); } set { ViewState["indexValue"] = value; } } }

用ControlState存一個index值

ControlStateUserControl.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="ControlStateUserControl.ascx.cs" Inherits="ControlStateUserControl" %> <asp:Button ID="Button1" runat="server" Text="ControlState" />

ControlStateUserControl.ascx.cs

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class ControlStateUserControl : System.Web.UI.UserControl { private int indexValue; protected override void OnInit(EventArgs e) { base.OnInit(e); Page.RegisterRequiresControlState(this); } protected void Page_Load(object sender, EventArgs e) { } protected override object SaveControlState() { object obj = base.SaveControlState(); if (indexValue != 0) { if (obj != null) { return new Pair(obj, indexValue); } else { return (indexValue); } } else { return obj; } } protected override void LoadControlState(object state) { if (state != null) { Pair p = state as Pair; if (p != null) { base.LoadControlState(p.First); indexValue = (int)p.Second; } else { if (state is int) { indexValue = (int)state; } else { base.LoadControlState(state); } } } } public int Index { get { return indexValue; } set { indexValue = value; } } }

啓用ViewState功能

StateManagement.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="StateManagement.aspx.cs" Inherits="StateManagement" %> <%@ Register Src="ViewStateUserControl.ascx" TagName="ViewStateUserControl" TagPrefix="uc1" %> <%@ Register Src="ControlStateUserControl.ascx" TagName="ControlStateUserControl" TagPrefix="uc2" %> <!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>StateManagement</title> </head> <body> <form id="form1" runat="server"> <div> <uc1:ViewStateUserControl ID="ViewStateUserControl1" runat="server" /> <asp:Label ID="lblViewState" runat="server" Text="Label"></asp:Label> <br /> <uc2:ControlStateUserControl ID="ControlStateUserControl1" runat="server" /> <asp:Label ID="lblControlState" runat="server" Text="Label"></asp:Label> </div> </form> </body> </html>

StateManagement.aspx.cs

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class StateManagement : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { this.lblViewState.Text = (this.ViewStateUserControl1.Index++).ToString(); this.lblControlState.Text = (this.ControlStateUserControl1.Index++).ToString(); } }

關閉ViewState功能

StateManagement.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="StateManagement.aspx.cs" EnableViewState="false" Inherits="StateManagement" %>

執行結果:

網頁開啓ViewState功能

網頁關閉ViewState功能

參考網址:

http://msdn.microsoft.com/en-us/library/1whwt1k7.aspx

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