C# 动态下拉列表无法按字母顺序排序
我创建了两个下拉列表,第二个从第一个列表中提取。我希望第二个的结果按字母顺序显示,但是,即使我在SQL中包含了ORDER BY,该列表也不会生成排序列表C# 动态下拉列表无法按字母顺序排序,c#,asp.net,alphabetical,cascadingdropdown,C#,Asp.net,Alphabetical,Cascadingdropdown,我创建了两个下拉列表,第二个从第一个列表中提取。我希望第二个的结果按字母顺序显示,但是,即使我在SQL中包含了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 : <asp:SqlDataSource ID="iSA
<div class="auto-style17">
Please select the category of activity you are reviewing from the pick list :
<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:
<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">
}正如建议的那样,标记中声明的
SqlDataSource
根本不被使用,但查询是从代码后面创建的。您必须在代码隐藏中的ActivitySelect\u SelectedIndexChanged()
方法中更改SQL语句:
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();
}
}
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
,显示的DropDownList没有DataSourceID属性将其链接到显示的SqlDataSource???您需要写入“按txtname asc订购“在sql中query@MandarDhadve我已经在asc中添加了,但这并没有对结果产生影响。@NineBerry数据源ID应用于顶部下拉列表,因为这是一个级联参数。下拉列表将生成正确的字段,只是没有按字母顺序列出。如果这还需要声明的数据源,我想它不会带来任何回报??显示完整的源代码,或者更好的是创建一个非常感谢的感谢。我添加了代码,一切都很好。