DropDownList 事件不会发生 在线=

Question

 if (Request.QueryString.Count != 0)
        {
            String NewsSortID = Request.QueryString["NewsSortID"].ToString();
            NewsSort newSort = new NewsSort();
            DataSet ds= newSort.queryNewsSortInfoId(NewsSortID);
            if (ds.Tables[0].Rows.Count == 1 || ds.Tables[0].Rows.Count == 0)
            {
                this.Button3.Visible = false;
                this.TextBox1.Visible = false;
                this.DropDownList1.Visible = false;
            }
            
            
                this.DropDownList1.DataSource = ds;
                
                this.DropDownList1.DataBind();
这是这样绑定的！
但页面会被刷新事件不会被执行。。
如果我DropDownList1不这样磅定我的事件就会被触发救救小弟啊`

Answer 1

1、autopostback = true2、这些个if都true么？- -;

Answer 2

绑定的代码要放到!ispostback里

Answer 3

autopostback = true 

Answer 4

autopostback = true 
绑定的代码要放到!ispostback里貌似就是这个原因

Answer 5

<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged1" DataTextField="Name" DataValueField="ClassID">
                </asp:DropDownList>                  if(!this.IsPostBack){
            this.start();
            this.bingDropDownList1();
        }        我都这样写`但就是不行`如果没有那磅定事件就会激活`    

Answer 6

断点
断到
              if(!this.IsPostBack){ 
            this.start(); 
            this.bingDropDownList1(); 
        }        
这个}位置就没了
唉！！

Answer 7

//数据库
   public DataSet FillDS(string sql)
        {
            GetConn getConn = GetConn.get();
            DataSet ds = new DataSet();
            SqlConnection conn = getConn.Conn();
            SqlDataAdapter ad = new SqlDataAdapter(sql, conn);
            ad.Fill(ds);
            return ds;
        }
//实现接口
#region NewsSortDao 成员        public DataSet queryNewsSortInfoId(string NewsSortID)
        {
            string sql =string.Format( "select * from NewsSort where ClassID={0}",NewsSortID);
            return this.FillDS(sql);
        }
        #endregion
页面的。CS
public partial class admin_Manage : System.Web.UI.Page
{
    private News news = new News();
    public int curPage;//当前页
    public int curCount;//一共页
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!this.IsPostBack){
            this.start();
            this.bingDropDownList1();
        }    
    }
    //开始加载dataList1
    void start() {
        if (Request.QueryString.Count != 0)
        {
            String NewsSortID="";
             String NewsSortName="";
             try
             {
                 NewsSortID = Request.QueryString["NewsSortID"].ToString();
                 NewsSortName = Request.QueryString["NewsSortName"].ToString();       
             }
             catch {
             }
             if (NewsSortID == "" || NewsSortName=="") {
                 NewsSortID = "1";
                 NewsSortName = "最新简讯";
             }
             curCount = news.countNews(NewsSortID);
             curPage=Util.getCurPage(curPage.ToString(), curCount);
             HttpCookie ck = new HttpCookie("count", this.curCount.ToString());
             HttpCookie pa = new HttpCookie("curPage", this.curPage.ToString());
             Response.Cookies.Add(ck);
             Response.Cookies.Add(pa);
             DataSet ds = news.queryInitialize(NewsSortID, NewsSortName, curPage);
            if (ds.Tables[0].Rows.Count != 0)
            {
                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {
                    if (ds.Tables[0].Rows[i]["tile"]==DBNull.Value) {
                        ds.Tables[0].Rows[i]["tile"] = ds.Tables[0].Rows[i]["content"].ToString().Substring(1, 10);
                    }
                }
                this.DataList1.DataSource = ds;
                this.DataList1.DataBind();
            }
        }   
    }    //绑定下拉框
    void bingDropDownList1() {
        if (Request.QueryString.Count != 0)
        {
            String NewsSortID = Request.QueryString["NewsSortID"].ToString();
            NewsSort newSort = new NewsSort();
            DataSet ds= newSort.queryNewsSortInfoId(NewsSortID);
            if (ds.Tables[0].Rows.Count == 1 || ds.Tables[0].Rows.Count == 0)
            {
                this.Button3.Visible = false;
                this.TextBox1.Visible = false;
                this.DropDownList1.Visible = false;
            }
           
                this.DropDownList1.DataSource = ds;
                this.DropDownList1.DataBind();
                    }
    }    protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
    {
        if (e.CommandName == "one")
        {
            //第一页
            this.curPage = 1;
            this.start();
        }
        else if (e.CommandName == "next")
        {
            //下一页
            this.curPage = Convert.ToInt32(Request.Cookies["curPage"].Value.ToString()) + 1;
            this.start();
        }
        else if (e.CommandName == "lastpage")
        {
            //上一页
            this.curPage = Convert.ToInt32(Request.Cookies["curPage"].Value.ToString()) - 1;
            this.start();
        }
        else if (e.CommandName == "last")
        {
            //最后一页
            this.curPage = Convert.ToInt32(Request.Cookies["count"].Value.ToString());
            this.start();
        }
        else if (e.CommandName == "go")
        {
            //到第几页
            try
            {
                this.curPage = Convert.ToInt32(Request.QueryString["curPage"].ToString());
            }
            catch {
                this.curPage = 1;
            }
            this.start();
        }
        else if (e.CommandName == "de")
        {
            string de = "";
            for (int i = 0; i < this.DataList1.Items.Count; i++)
            {
                HtmlInputCheckBox chdel = this.DataList1.Items[i].FindControl("ckdel") as HtmlInputCheckBox;
                if (chdel != null)
                {
                    if (chdel.Checked)
                    {
                        de += chdel.Value + ",";
                    }
                }            }
            de = de.Substring(0, de.Length - 1);
            if (news.deNews(de))
            {
                Response.Write("<script>alert('删除成功！');</script>");
            }
            else {
                Response.Write("<script>alert('删除失败！');</script>");
            }
            this.start();        }
    }    protected void DropDownList1_SelectedIndexChanged1(object sender, EventArgs e)
    {
        if (this.DropDownList1.SelectedItem.Text == null || this.DropDownList1.SelectedItem.Text == "")
        {        }
        else
        {
            string NewsSortName = this.DropDownList1.SelectedItem.Text;
            curCount = news.countNews(NewsSortName);
            curPage = Util.getCurPage(curPage.ToString(), curCount);
            HttpCookie ck = new HttpCookie("count", this.curCount.ToString());
            HttpCookie pa = new HttpCookie("curPage", this.curPage.ToString());
            Response.Cookies.Add(ck);
            Response.Cookies.Add(pa);
            DataSet ds = news.queryInitialize(NewsSortName, curPage);
            if (ds.Tables[0].Rows.Count != 0)
            {
                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {
                    if (ds.Tables[0].Rows[i]["tile"] == DBNull.Value)
                    {
                        ds.Tables[0].Rows[i]["tile"] = ds.Tables[0].Rows[i]["content"].ToString().Substring(1, 10);
                    }
                }
                this.DataList1.DataSource = ds;
                this.DataList1.DataBind();
            }
   
        }
    }
    protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (this.DropDownList1.SelectedItem.Text == null || this.DropDownList1.SelectedItem.Text == "")
        {        }
        else
        {
            string NewsSortName = this.DropDownList1.SelectedItem.Text;
            curCount = news.countNews(NewsSortName);
            curPage = Util.getCurPage(curPage.ToString(), curCount);
            HttpCookie ck = new HttpCookie("count", this.curCount.ToString());
            HttpCookie pa = new HttpCookie("curPage", this.curPage.ToString());
            Response.Cookies.Add(ck);
            Response.Cookies.Add(pa);
            DataSet ds = news.queryInitialize(NewsSortName, curPage);
            if (ds.Tables[0].Rows.Count != 0)
            {
                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {
                    if (ds.Tables[0].Rows[i]["tile"] == DBNull.Value)
                    {
                        ds.Tables[0].Rows[i]["tile"] = ds.Tables[0].Rows[i]["content"].ToString().Substring(1, 10);
                    }
                }
                this.DataList1.DataSource = ds;
                this.DataList1.DataBind();
            }        }
    }
}//页面<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged1" DataTextField="Name" DataValueField="ClassID"> 
                </asp:DropDownList> 

Answer 8

断点跟踪：
protected void DropDownList1_SelectedIndexChanged1(object sender, EventArgs e)
    {
        if (this.DropDownList1.SelectedItem.Text == null || this.DropDownList1.SelectedItem.Text == "")
        {  这里this.DropDownList1.SelectedItem.Text的值

Answer 9

你先不要房在IsPostBack中测试，你直接测试，看他能不能运行，要不也可以放在RowDataBound事件中测试下

Answer 10

断点跟踪不了`RowDataBound这个软个我还没听说过`！

Answer 11

不房到IsPostBack
他每次都什么执行加载事件其它也不会执行