动态下拉列表无法按字母顺序排序

Question

我创建了 2 个下拉列表，第二个来自第一个。我希望第二个的结果按字母顺序显示，但是，即使我在SQL中包含ORDER BY，该列表也不会生成排序列表。

<div class="auto-style17">
Please select the category of activity you are reviewing from the pick list :&nbsp; 
<asp:SqlDataSource ID="iSAMS" runat="server" ConnectionString="<%$ ConnectionStrings:iSAMSConnectionString %>" 
SelectCommand="SELECT [blnActive], [TblActivityManagerFolderID], [txtName] FROM [TblActivityManagerFolder] WHERE ([intActivity] = @intActivity)">
<SelectParameters>
<asp:Parameter DefaultValue="34" Name="intActivity" Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>                     
<asp:DropDownList ID="CategorySelect" runat="server" DataTextField="txtName" DataValueField="TblActivityManagerFolderID" 
OnSelectedIndexChanged="ActivitySelect_SelectedIndexChanged" CssClass="newStyle1" AutoPostBack="True">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="CategorySelect" 
ErrorMessage="Please select your answer" style="text-align: left; font-weight: 700; color: #FF0000; font-size: medium;">!</asp:RequiredFieldValidator>
</div>
<br />
<div class="auto-style20">
Please select the activity undertaken from the pick list:&nbsp; 
<asp:DropDownList ID="ActivitySelect" runat="server" DataTextField="txtName" DataValueField="TblActivityManagerGroupId" CssClass="newStyle1" AutoPostBack="True">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="ActivitySelect" 
ErrorMessage="Please select your answer" style="text-align: left; font-weight: 700; color: #FF0000; font-size: medium;">!</asp:RequiredFieldValidator>
<asp:SqlDataSource ID="iSAMSActivity" runat="server" ConnectionString="<%$ ConnectionStrings:iSAMSConnectionString %>" SelectCommand="SELECT txtName, intActivity, intFolder, TblActivityManagerGroupId FROM TblActivityManagerGroup WHERE (intFolder = @intFolder) ORDER BY txtName ASC">
<SelectParameters>
<asp:ControlParameter ControlID="CategorySelect" Name="intFolder" PropertyName="SelectedValue" Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>                    
</div>
<div class="auto-style19">

任何想法如何让它工作 - 请记住，我对 C# 非常陌生，这是我的第一个项目，所以我边走边学，所以我不太知道在哪里放置编码解决方案。

下面是背后的代码：

protected void ActivitySelect_SelectedIndexChanged(object sender, EventArgs e)
{
ActivitySelect.Items.Clear();
ActivitySelect.Items.Add(new ListItem("--Select Activity--", ""));
ActivitySelect.AppendDataBoundItems = true;
String strConnString = ConfigurationManager
.ConnectionStrings["iSAMSConnectionString"].ConnectionString;
String strQuery = "select txtName, TblActivityManagerGroupID from dbo.TblActivityManagerGroup " +
"where intFolder=@intFolder";
SqlConnection con = new SqlConnection(strConnString);
SqlCommand cmd = new SqlCommand();
cmd.Parameters.AddWithValue("@intFolder",
CategorySelect.SelectedItem.Value);
cmd.CommandType = CommandType.Text;
cmd.CommandText = strQuery;
cmd.Connection = con;
try
{
con.Open();
ActivitySelect.DataSource = cmd.ExecuteReader();
ActivitySelect.DataTextField = "txtName";
ActivitySelect.DataValueField = "TblActivityManagerGroupID";
ActivitySelect.DataBind();
if (ActivitySelect.Items.Count > 1)
{
ActivitySelect.Enabled = true;
}
else
{
ActivitySelect.Enabled = false;
}
}
finally
{
con.Close();
con.Dispose();
}
}

}

Answer 1

如建议的那样，根本不使用标记中声明的SqlDataSource，而是从隐藏的代码创建查询。您必须在代码隐藏中更改ActivitySelect_SelectedIndexChanged()方法中的 SQL 语句：

String strQuery = "select txtName, TblActivityManagerGroupID from dbo.TblActivityManagerGroup " +
"where intFolder=@intFolder order by txtName ";

或者，通过使用DropDownList上的DataSourceID属性链接到正确的SqlDataSource，将代码更改为实际使用标记中的SqlDataSource。