DropDownList选择的项目不断选择相同的项目ASP.NET c＃

Question

我已经在ASP.NET中的Webform上创建了DropDownList。在浏览器中，我想从下拉列表中选择一个项目，并在标签中显示该项目的文本，但无论选择哪个项目，下拉菜单都会选择相同的项目。

这是我的DropDownList;

<asp:DropDownList ID="ddlWeek" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlWeek_SelectedIndexChanged" Visible="False"> 
     <asp:ListItem Value="1">Select a Week</asp:ListItem> 
     <asp:ListItem Value="10">June 7 to June 14, 2015</asp:ListItem> 
     <asp:ListItem Value="10">June 14 to June 21, 2015</asp:ListItem> 
     <asp:ListItem Value="10">June 21 to June 28, 2015</asp:ListItem> 
     <asp:ListItem Value="10">June 28 to July 5, 2015</asp:ListItem> 
     <asp:ListItem Value="10">July 5 to July 12, 2015</asp:ListItem> 
     <asp:ListItem Value="10">July 12 to July 19, 2015</asp:ListItem> 
     <asp:ListItem Value="10">July 19 to July 26, 2015</asp:ListItem> 
     <asp:ListItem Value="10">July 26 to August 2, 2015</asp:ListItem> 
     <asp:ListItem Value="10">August 2 to August 9, 2015</asp:ListItem> 
     <asp:ListItem Value="10">August 9 to August 16, 2015</asp:ListItem> 
     <asp:ListItem Value="10">August 16 to August 23, 2015</asp:ListItem> 
     <asp:ListItem Value="10">August 23 to August 30, 2015</asp:ListItem> 

    </asp:DropDownList> 

这就是我要做的：

protected void ddlWeek_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    lbWeek.Text = "You selected the week of: " + ddlWeek.SelectedItem.Text; 
} 

使用自动回发，并将它设置为true。任何帮助赞赏。 泥炭

Answer 1

您的下拉列表项值必须不同。如果您为所有项目提供相同的值，则它在asp.net中不起作用。

<asp:DropDownList ID="ddlWeek" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlWeek_SelectedIndexChanged"> 
      <asp:ListItem Value="1">Select a Week</asp:ListItem> 
      <asp:ListItem Value="2:10">June 7 to June 14, 2015</asp:ListItem> 
      <asp:ListItem Value="3:10">June 14 to June 21, 2015</asp:ListItem> 
      <asp:ListItem Value="4:10">June 21 to June 28, 2015</asp:ListItem> 
      <asp:ListItem Value="5:10">June 28 to July 5, 2015</asp:ListItem> 
      <asp:ListItem Value="6:10">July 5 to July 12, 2015</asp:ListItem> 
      <asp:ListItem Value="7:10">July 12 to July 19, 2015</asp:ListItem> 
      <asp:ListItem Value="8:10">July 19 to July 26, 2015</asp:ListItem> 
      <asp:ListItem Value="9:10">July 26 to August 2, 2015</asp:ListItem> 
      <asp:ListItem Value="10:10">August 2 to August 9, 2015</asp:ListItem> 
      <asp:ListItem Value="11:10">August 9 to August 16, 2015</asp:ListItem> 
      <asp:ListItem Value="12:10">August 16 to August 23, 2015</asp:ListItem> 
      <asp:ListItem Value="13:10">August 23 to August 30, 2015</asp:ListItem> 
     </asp:DropDownList> 

编辑：

我已经改变了在上面的代码下拉控件的所有值和DropDownList中的现在你可以选择的值如下逻辑：

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