webform问题？解决100分

Question

我在后台代码中改变了控件的位置，执行DropDownList的SelectedIndexChanged（）事件后，控件又回到了原来的位置，而且所有DropDownList绑定的数据都显示不出来了，Page_Load()中的代码已放在
if(!IsPostBack){}中了，

Answer 1

我是这样实现控件位置改变的：
用两个Panel，定位在表格中，一左一右Pnlleft，Pnlright
所有控件起始都放在Pnlleft中，加载页面时通过代码实现将Pnlleft中的部分控件放进Pnlright中
Pnlleft.Controls.Remove(控件ID);
Pnlright.Controls.Add(控件ID);
但是执行DropDownList的SelectedIndexChanged（）事件后，又回到初始状态，控件回到Pnlleft中，并且DropDownList绑定的数据都消失了
大家帮我想想办法

Answer 2

DropDownList的SelectedIndexChanged（）事件就是做关联绑定，但回发后根本就没有绑定初始化放在Page_Load(){}中不行吗？要放在哪里

Answer 3

private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!IsPostBack)   
{
//初始化Panel
PanelJudge(); //绑定所有DropDownList
DropDownListBind(DDList_dep,"*","tab_department","dep_id","dep_name");
DropDownListBind(DDList_group,"*","tab_group","group_id","group_name");
DropDownListBind(Dropuse_dep,"*","tab_department","dep_id","dep_name");
DropDownListBind(Drop_user,"*","tab_user","user_id","user_name"); Dropindep.Items.Insert(0,new ListItem("-------请选择--------"));
DDList_manageclass.Items.Clear();
DDList_manageclass.Items.Insert(0,new ListItem("-------请选择--------")); //根据用户的权限选定“管理分类”
GetPurview();
//如果只有一个权限，则锁定该权限

if(DDList_manageclass.Items.Count == 2)
{
DDList_manageclass.Items[1].Selected = true;
DDList_manageclass.Enabled = false; DropBindEqName();
DropBind(Dropeq_spec,"规格",DDList_manageclass);
DropBind(Dropeq_class,"类别",DDList_manageclass);
DropBind(Droptype,"型号",DDList_manageclass);
DropBind(Dropguideline,"主要技术指标",DDList_manageclass);
DropBind(Dropuse_place,"使用地点",DDList_manageclass);
DropBind(Droptech,"技术状况",DDList_manageclass);
DropBind(Dropquality,"质量状况",DDList_manageclass);
DropBind(Dropdescription,"简单描述",DDList_manageclass);
DropBind(Dropmadein,"制造国",DDList_manageclass);
DropBind(Dropfactory,"制造厂",DDList_manageclass);
DropBind(Dropbankroll_source,"资金来源",DDList_manageclass);
}
}
}#region 判断Panel
/// <summary>
/// 根据data.aspx传来的数据，显示相应的项
/// </summary>
private void PanelJudge()
{
bool[] ctrlvisible = new bool[39];
System.Web.UI.WebControls.Panel[] MyPnl = new System.Web.UI.WebControls.Panel[39];
System.Web.UI.WebControls.Panel[] PnlTrue = new System.Web.UI.WebControls.Panel[39]; //初始化数组MyPnl
MyPnl[0] = this.Pnluni_number;
MyPnl[1] = this.Pnlupper_num;
MyPnl[2] = this.Pnldep;
MyPnl[3] = this.Pnleq_class;
MyPnl[4] = this.Pnlmanageclass;
MyPnl[5] = this.Pnluse_dep;
MyPnl[6] = this.Pnluser;
MyPnl[7] = this.Pnlgroup;
MyPnl[8] = this.Pnleqname;
MyPnl[9] = this.Pnltype;
MyPnl[10] = this.Pnleq_spec;
MyPnl[11] = this.Pnlguideline;
MyPnl[12] = this.Pnldescription;
MyPnl[13] = this.Pnlmadein;
MyPnl[14] = this.Pnlfactory;
MyPnl[15] = this.Pnlfactory_num;
MyPnl[16] = this.Pnlfactory_date;
MyPnl[17] = this.Pnldatetime;
MyPnl[18] = this.Pnlbankroll_source;
MyPnl[19] = this.Pnlvalue;
MyPnl[20] = this.Pnlincrease_value;
MyPnl[21] = this.Pnldecrease_value;
MyPnl[22] = this.Pnlnet_value;
MyPnl[23] = this.Pnlcom_coefficient1;
MyPnl[24] = this.Pnlcom_coefficient2;
MyPnl[25] = this.Pnltech;
MyPnl[26] = this.Pnlquality;
MyPnl[27] = this.PnlLCdate;
MyPnl[28] = this.Pnlcheckup_cyc;
MyPnl[29] = this.Pnleffective_date;
MyPnl[30] = this.Pnlstkrequi_num;
MyPnl[31] = this.Pnlchkaccept_num;
MyPnl[32] = this.Pnlchange_causation;
MyPnl[33] = this.Pnldeal_advice;
MyPnl[34] = this.Pnldeal_price;
MyPnl[35] = this.Pnluse_place;
MyPnl[36] = this.Pnleq_re;
MyPnl[37] = this.Pnlindep;
MyPnl[38] = this.Pnlmyfile; ctrlvisible = (bool[])Session["ctrl_v"]; for(int i=0;i<ctrlvisible.Length;i++)
{
MyPnl[i].Visible = ctrlvisible[i];
} //七个必填项
this.Pnluni_number.Visible = true;//统一编号
this.Pnlmanageclass.Visible = true;//管理分类
this.Pnleqname.Visible = true;//设备名称
this.Pnldep.Visible = true;//归口部门
this.Pnleq_spec.Visible = true;//规格
this.Pnltype.Visible = true;//型号
this.Pnlindep.Visible = true;//是否是独立设备 //将MyPnl中Visible＝true的Panel取出放入PnlTrue中
int m;
int n=0;
for(m=0;m<MyPnl.Length;m++)
{
if(MyPnl[m].Visible == true && MyPnl[m] != this.Pnleffective_date)
{
PnlTrue[n] = MyPnl[m];
n++;
}
} //将显示的Panel放入PnlTrue中，并将第偶数个放入Pnlright，使之分两列显示
for(int x=0;x<PnlTrue.Length;x++)
{
x++;
if(x<PnlTrue.Length && PnlTrue[x] != null)
{
Pnlright.Controls.Add(PnlTrue[x]);
//Pnlleft.Controls.Remove(PnlTrue[x]);
}
}
}
#endregion
#region 管理分类与设备的属性名关联
/// <summary>
/// 管理分类与设备的属性名关联
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void DDList_manageclass_SelectedIndexChanged(object sender, System.EventArgs e)
{
if(DDList_manageclass.SelectedItem.Text == "-------请选择--------")
{
DropDownListBind(Dropeqname,"*","tab_eqname","eqname_id","eqname_name");
DropBind(Dropeq_spec,"规格");
DropBind(Dropeq_class,"类别");
DropBind(Droptype,"型号");
DropBind(Dropguideline,"主要技术指标");
DropBind(Dropuse_place,"使用地点");
DropBind(Droptech,"技术状况");
DropBind(Dropquality,"质量状况");
DropBind(Dropdescription,"简单描述");
DropBind(Dropmadein,"制造国");
DropBind(Dropfactory,"制造厂");
DropBind(Dropbankroll_source,"资金来源");
}
else
{
DropBindEqName();
DropBind(Dropeq_spec,"规格",DDList_manageclass);
DropBind(Dropeq_class,"类别",DDList_manageclass);
DropBind(Droptype,"型号",DDList_manageclass);
DropBind(Dropguideline,"主要技术指标",DDList_manageclass);
DropBind(Dropuse_place,"使用地点",DDList_manageclass);
DropBind(Droptech,"技术状况",DDList_manageclass);
DropBind(Dropquality,"质量状况",DDList_manageclass);
DropBind(Dropdescription,"简单描述",DDList_manageclass);
DropBind(Dropmadein,"制造国",DDList_manageclass);
DropBind(Dropfactory,"制造厂",DDList_manageclass);
DropBind(Dropbankroll_source,"资金来源",DDList_manageclass);
}
}
#endregion

Answer 4

代码乱，请多包涵！其实就是为了实现界面整齐，在代码中动态的将控件位置调整为两列显示，因为要显示的控件的个数是根据用户的选择来确定的，我将每一个控件都放到Panel里，然后根据用户的选择情况显示相应的项，将要显示的Panel装入数组PnlTrue[]中，再按两列显示在界面上。如果在页面上用表格定位的话，位置一死，显示出来的控件会零零散散分布在界面上，不好看我用的方法比较烦，如果你们有更好的方法提供给我，不胜感激！

Answer 5

//初始化Panel
PanelJudge();放到if(!Page.IsPostBack)外面，使每次加载页面都初始化一次panel

Answer 6

至于你的DropDownList的绑定，我没看懂，抱歉