我想要部分回发（asyncpostback）而不是fullpostback。但它不起作用。动态创建的复选框，其中选中或未选中的复选框会导致 fullpostback，但它应该是 asyncpostback。这是我的代码.....
<asp:CheckBoxList ID="chkList" runat="server" AutoPostBack="true" OnSelectedIndexChanged="chkList_SelectedIndexChanged"
ClientIDMode="AutoID">
</asp:CheckBoxList>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="lblMessage" runat="server" Visible="false"></asp:Label>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="chkList" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
C#代码：
private static readonly string constring = ConfigurationManager.ConnectionStrings["ConnectionStrRead"].ToString();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
SqlConnection con = new SqlConnection(constring);
SqlCommand com = new SqlCommand("Select * from Category");
com.Connection = con;
con.Open();
SqlDataAdapter da = new SqlDataAdapter(com);
DataTable dt = new DataTable();
da.Fill(dt);
int dtRows = dt.Rows.Count;
List<string> itemList = new List<string>();
for (int i = 0; i < dtRows; i++)
{
//itemList = new List<string>();
string item = dt.Rows[i]["CategoryName"].ToString() + "(" + dt.Rows[i]["CreateUser"].ToString() + ")";
itemList.Add(item);
}
chkList.DataSource = itemList.ToArray();
chkList.DataBind();
con.Close();
}
}
protected void chkList_SelectedIndexChanged(object sender, EventArgs e)
{
lblMessage.Visible = true;
lblMessage.Text = string.Empty;
foreach (ListItem item in chkList.Items)
{
if (item.Selected)
{
lblMessage.Text += item.Text + "<br/>";
}
}
}