📄 pageevent.aspx
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<html>
<head>
<title>IsPostBack属性</title>
<script Language="C#" runat="server" >
void Page_Load()
{
if(this.IsPostBack == false)
{
Prompt.Text = "选择你喜欢的水果:";
FoodList.Items.Add("苹果");
FoodList.Items.Add("香蕉");
FoodList.Items.Add("西瓜");
FoodList.Items.Add("菠萝");
Result.Visible = false;
return;
}
Result.Visible = true;
FoodList.Visible = false;
Prompt.Visible = false;
Result.Text = "你喜欢的水果是：" + FoodList.SelectedItem.ToString();
}
</script>
</head>
<body>
<form id="form1" method="post" runat="server">
<asp:Label id="Prompt" runat="server" /></br>
<asp:DropDownList id="FoodList" runat="server" /></br>
<asp:Label id="Result" runat="server" /></br>
<input type="submit"/>
</form>
</body>
</html>
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