没有很好地使用asp列表框

发布于 2025-01-05 11:47:55 字数 950 浏览 0 评论 0原文

我所要做的只是单击一个按钮，文本框中的文本就会自动添加为列表框中的项目。这不应该是直接的吗？在调试时，添加了该项目，我可以通过观看 ListBox1.Items[0] 看到文本，但网页中没有显示任何内容。我在控制台应用程序中遇到了同样的问题但没有解决！有人可以指导我看看我做错了什么吗？

protected void Button1_Click(object sender, EventArgs e)
    {
        ListBox1.Items.Add(new ListItem(TextBox1.Text));
    }

非常感谢

编辑：

在过去的项目中，我使用了 DataSource 属性，效果非常好。我还没有成功地使用添加项目！可能有某种刷新或更新？

页面代码：

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>

<asp:ListBox ID="ListBox1" runat="server" Height="150px" Width="295px"></asp:ListBox>

<asp:UpdatePanel ID="updatePanel1" runat="server">
    <ContentTemplate>
        <asp:Button ID="Button1" runat="server" Text="Submit" OnClick="Button1_Click" />
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    </ContentTemplate>
</asp:UpdatePanel>

原文

All I wish to do is simply click a button and the text in a textbox is automatically added as an item in the listbox. Shouldn't this be straight forward? Whilst debugging, the item is added and I can see the text by watching ListBox1.Items[0], but nothing is displayed in the web page. I had the same problem which i did not solve, in a console application! Can some one please guide me to what I am doing wrong?

protected void Button1_Click(object sender, EventArgs e)
    {
        ListBox1.Items.Add(new ListItem(TextBox1.Text));
    }

Many thanks

Edit:

In a past project, I used the DataSource property, which worked perfectly. I have never yet managed to use the add Items! May be there is some sort of refresh or update?

Page code:

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>

<asp:ListBox ID="ListBox1" runat="server" Height="150px" Width="295px"></asp:ListBox>

<asp:UpdatePanel ID="updatePanel1" runat="server">
    <ContentTemplate>
        <asp:Button ID="Button1" runat="server" Text="Submit" OnClick="Button1_Click" />
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    </ContentTemplate>
</asp:UpdatePanel>

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桃扇骨 2025-01-12 11:47:55

看起来您的列表框位于更新面板之外。将其弹出到更新面板中：

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
    <asp:DropDownList ID="DropDownList1" runat="server">
    </asp:DropDownList>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="AddItem" />
</ContentTemplate>
</asp:UpdatePanel>

Looks like your listbox is outside of the update panel. Pop it inside the update panel:

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
    <asp:DropDownList ID="DropDownList1" runat="server">
    </asp:DropDownList>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="AddItem" />
</ContentTemplate>
</asp:UpdatePanel>

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