Asp.Net 下拉列表

发布于 2024-11-03 08:31:33 字数 285 浏览 0 评论 0原文

我在运行时绑定下拉列表，并将数据填充到数据库中。没关系很好。但是如果我想选择特定值并显示在消息框中。它仅显示默认值。

这里我的代码是：

protected void Button1_Click(object sender, EventArgs e)
{
    Response.Write("You have selected " + DropDownList1.SelectedItem.Value);
  }

那么我如何在消息框中显示所选值。我在这里很新。请帮我。

原文

I Bind the Dropdownlist at runtime and data is populated to the database. Its ok Fine. But if i want to select the particular value and display in a message box. It only shows the default value.

Here My code is:

protected void Button1_Click(object sender, EventArgs e)
{
    Response.Write("You have selected " + DropDownList1.SelectedItem.Value);
  }

So how can i display the selected value in the message box.
Here i am very new. Please help me.

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英雄似剑 2024-11-10 08:31:33

问题出在您分配 Datasource 的 Page_load 事件中。当您单击该按钮时，Page_load 将再次调用，并将再次重新绑定到您的下拉列表。

应该是：

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        //Set your dropdown datasource here...
    }
}

The problem is in your Page_load event, where you are assigning your Datasource. When you click the button, Page_load will be called again and it will rebind to your dropdown again.

It should be:

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        //Set your dropdown datasource here...
    }
}

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゛时过境迁 2024-11-10 08:31:33

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
    Response.Write("<script>alert('You have selected ' + '" + DropDownList1.SelectedValue + "')</script>")
End Sub

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
    Response.Write("<script>alert('You have selected ' + '" + DropDownList1.SelectedValue + "')</script>")
End Sub

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