是要用<asp:image>控件,设置其显示图片的路径吗? Exam3_6.aspx<%@ Page Language="vb" AutoEventWireup="false" Codebehind="Exam3_6.aspx.vb" Inherits="Chapter3.Exam3_6"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <title>Exam3_6</title> <meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.0"> <meta name="CODE_LANGUAGE" content="Visual Basic 7.0"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body> <form id="Form1" method="post" runat="server"> <FONT face="宋体"> <P> <asp:Image id="Image1" runat="server"></asp:Image></P> <P>请从列表中选择 <asp:DropDownList id="cboList" runat="server"> <asp:ListItem Value="Cereal1.gif" Selected="True">有益健康的谷物</asp:ListItem> <asp:ListItem Value="Cereal2.gif">玉米片谷类食品</asp:ListItem> <asp:ListItem Value="Cereal3.gif">U.F.O.S</asp:ListItem> <asp:ListItem Value="Cereal4.gif">Oatey O 的产品</asp:ListItem> <asp:ListItem Value="Cereal5.gif">打击</asp:ListItem> <asp:ListItem Value="Cereal6.gif">果味冰糕</asp:ListItem> </asp:DropDownList> <asp:Button id="btnOk" runat="server" Text="确定"></asp:Button></P> </FONT> </form> </body> </HTML>Public Class Exam3_6 Inherits System.Web.UI.Page Protected WithEvents Image1 As System.Web.UI.WebControls.Image Protected WithEvents cboList As System.Web.UI.WebControls.DropDownList Protected WithEvents btnOk As System.Web.UI.WebControls.Button#Region " Web 窗体设计器生成的代码 " '该调用是 Web 窗体设计器所必需的。 <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() End Sub Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init 'CODEGEN: 此方法调用是 Web 窗体设计器所必需的 '不要使用代码编辑器修改它。 InitializeComponent() End Sub#End Region Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load '在此处放置初始化页的用户代码 Image1.ImageUrl = "images/" & cboList.SelectedItem.Value Image1.AlternateText = cboList.SelectedItem.Text End Sub Private Sub btnOk_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOk.Click Image1.ImageUrl = "images/" & cboList.SelectedItem.Value Image1.AlternateText = cboList.SelectedItem.Text End Sub End Class
Exam3_6.aspx<%@ Page Language="vb" AutoEventWireup="false" Codebehind="Exam3_6.aspx.vb" Inherits="Chapter3.Exam3_6"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>Exam3_6</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.0">
<meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<FONT face="宋体">
<P>
<asp:Image id="Image1" runat="server"></asp:Image></P>
<P>请从列表中选择
<asp:DropDownList id="cboList" runat="server">
<asp:ListItem Value="Cereal1.gif" Selected="True">有益健康的谷物</asp:ListItem>
<asp:ListItem Value="Cereal2.gif">玉米片谷类食品</asp:ListItem>
<asp:ListItem Value="Cereal3.gif">U.F.O.S</asp:ListItem>
<asp:ListItem Value="Cereal4.gif">Oatey O 的产品</asp:ListItem>
<asp:ListItem Value="Cereal5.gif">打击</asp:ListItem>
<asp:ListItem Value="Cereal6.gif">果味冰糕</asp:ListItem>
</asp:DropDownList>
<asp:Button id="btnOk" runat="server" Text="确定"></asp:Button></P>
</FONT>
</form>
</body>
</HTML>Public Class Exam3_6
Inherits System.Web.UI.Page
Protected WithEvents Image1 As System.Web.UI.WebControls.Image
Protected WithEvents cboList As System.Web.UI.WebControls.DropDownList
Protected WithEvents btnOk As System.Web.UI.WebControls.Button#Region " Web 窗体设计器生成的代码 " '该调用是 Web 窗体设计器所必需的。
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() End Sub Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: 此方法调用是 Web 窗体设计器所必需的
'不要使用代码编辑器修改它。
InitializeComponent()
End Sub#End Region Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'在此处放置初始化页的用户代码
Image1.ImageUrl = "images/" & cboList.SelectedItem.Value
Image1.AlternateText = cboList.SelectedItem.Text
End Sub Private Sub btnOk_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOk.Click
Image1.ImageUrl = "images/" & cboList.SelectedItem.Value
Image1.AlternateText = cboList.SelectedItem.Text
End Sub
End Class