Web用户控件取值问题

Question

public string SelectedItem
{
   get { return UserSelectedItem;}
   set
   {
UserSelectedItem = value;
    }
}
orpublic string SelectedItem
{
   get { return this.ddl_department.SelectedValue;}
}

Answer 1

Department userctl = new affair.WebControl.Department();
string strDepartmentID = userctl.UserSelectedItem;取值后,什么也没有....

Answer 2

is that all in the aspx? how did you display the user control? care to show some more code, orDepartment userctl = new affair.WebControl.Department();
form1.Controls.Add(userctl);
string strDepartmentID = userctl.UserSelectedItem;

Answer 3

是在webform下运行,直接将用户控件拖到webform里,用户点击注册按钮,从用户控件中取相应的值

Answer 4

1. in Department class:
public string SelectedItem
{
   get { return this.ddl_department.SelectedValue;}
}
2. in your page class, don't callDepartment userctl = new affair.WebControl.Department();declare a variable in your page class code (usectl will the ID of the user control)protected Department userctl; >>>用户点击注册按钮in your 注册按钮 handler, userctl.SelectedItem

Answer 5

郁闷了... 再求助一次.谢谢 saucer(思归/MVP) !未将对象引用设置到对象的实例。
行 115： string strDepartmentID = userctl.SelectedItem;Department.ascx
----------------
public class Department : System.Web.UI.UserControl
{
protected System.Web.UI.WebControls.DropDownList ddl_department;
protected affair.Government_Affair.DS_Department_Lists dS_Department_Lists1;
public string sqlstring;
private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
{
DataSet ds = dS_Department_Lists1;
sqlstring = "SELECT DepartmentID, DepartmentName from tblDepartment";
BindTopData(ds,"tblDepartment",sqlstring);
}
} public string SelectedItem
{
get { return this.ddl_department.SelectedValue;}
} private void BindTopData(System.Data.DataSet ds,string tablename,string sqlstring)
{
sqlstring = "SELECT DepartmentID, DepartmentName from tblDepartment";
SqlConnection conn = new SqlConnection(ConfigurationSettings.AppSettings["sql_connstr"]);
SqlCommand cmd = new SqlCommand(sqlstring,conn);
conn.Open();
SqlDataReader myDataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
ddl_department.Items.Add(new ListItem("选择一个部门","-1"));
while(myDataReader.Read())
{
ddl_department.Items.Add(new ListItem(myDataReader.GetSqlValue(1).ToString(),myDataReader.GetSqlValue(0).ToString()));
}
conn.Close();
}
} ...自动生成的部分略.Register.aspx
-------------
public class Register : System.Web.UI.Page
{
protected Department userctl;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
load_init();

}
private void btnReg_Click(object sender, System.EventArgs e)
{
string strDepartmentID = userctl.SelectedItem;
                            ...............
}
}

Answer 6

show Register.aspx, do you have something like<cc:... id="userctl" runat="server" />???

Answer 7

<%@ Register TagPrefix="uc1" TagName="Department" Src="../WebControl/Department.ascx" %><uc1:Department id="uc_ddl_department" runat="server"></uc1:Department>找到错误了,万分感谢 saucer(思归/MVP)  !!