Tab切换时执行了两次OnTabIndexChanged事件是怎么回事 - FineUI 官方论坛

<form id="form1" runat="server">
<x:PageManager ID="PageManager1" runat="server" />
<x:TabStrip ID="TabStrip1" Width="750px" Height="300px" AutoPostBack="true" OnTabIndexChanged="TabStrip1_TabIndexChanged"
ShowBorder="true" ActiveTabIndex="1" runat="server">
<Tabs>
<x:Tab Title="标签一" EnableBackgroundColor="true" BodyPadding="5px"
Layout="Fit" runat="server">
<Items>
<x:SimpleForm ID="SimpleForm1" ShowBorder="false" EnableBackgroundColor="true"
ShowHeader="false" Title="SimpleForm1" runat="server">
<Items>
<x:Label ID="Label1" CssClass="highlight" Label="文本" Text="sanshi" runat="server" />
<x:NumberBox ID="NumberBox1" Label="数字输入框" Required="true" ShowRedStar="true"
runat="server" />
<x:TextBox ID="TextBox1" Label="文本框" runat="server" Required="True" ShowRedStar="true">
</x:TextBox>
<x:DatePicker ID="DatePicker1" runat="server" SelectedDate="2008-05-09" Label="日期选择器"
Text="2008-05-09" Required="true" ShowRedStar="true">
</x:DatePicker>
<x:TextArea ID="TextArea2" Label="多行文本框" runat="server" Required="True" ShowRedStar="true" />
</Items>
</x:SimpleForm>
</Items>
</x:Tab>
<x:Tab Title="标签二" BodyPadding="5px" EnableBackgroundColor="true" runat="server">
<Items>
<x:Label ID="Label2" CssClass="highlight" Text="sanshi" runat="server" />
</Items>
</x:Tab>
<x:Tab Title="标签三" BodyPadding="5px" EnableBackgroundColor="true"
runat="server">
<Items>
<x:Label ID="Label3" CssClass="highlight" Text="sanshi" runat="server" />
</Items>
</x:Tab>
</Tabs>
</x:TabStrip>
<br />
<x:Button ID="Button2" CssStyle="margin-right:5px;float:left;" ValidateForms="SimpleForm1"
Text="验证第一个标签中的表单" runat="server">
</x:Button>
<x:Button ID="Button3" Text="选中下一个标签" OnClick="Button3_Click" runat="server">
</x:Button>
<x:Label ID="Label4" runat="server" Text=""></x:Label>
</form>

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protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
aa = 0;
}
}
protected void Button3_Click(object sender, EventArgs e)
{
int nextIndex = TabStrip1.ActiveTabIndex + 1;
if (nextIndex >= TabStrip1.Tabs.Count)
{
nextIndex = 0;
}
TabStrip1.ActiveTabIndex = nextIndex;
}
private int aa
{
get { return (int)ViewState["aa"]; }
set { ViewState["aa"] = value; }
}
protected void TabStrip1_TabIndexChanged(object sender, EventArgs e)
{
aa++;
Label4.Text = "执行了" + aa + " 次";
if (TabStrip1.ActiveTabIndex == 0)
{
Label1.Text = "标签回发时间：" + DateTime.Now.ToLongTimeString();
}
else if (TabStrip1.ActiveTabIndex == 1)
{
Label2.Text = "标签回发时间：" + DateTime.Now.ToLongTimeString();
}
else if (TabStrip1.ActiveTabIndex == 2)
{
Label3.Text = "标签回发时间：" + DateTime.Now.ToLongTimeString();
}
}

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