价值无法从动态下拉中获得 [英] value not getting from dynamically dropdown

问题描述

亲爱的所有人，



我在c＃中使用Gridview作为我的网络应用程序。我使用Dyanamically Created Template创建了一个动态下拉。



但是我无法获得存储在DB中的下拉值。



那么，我怎样才能从每一列中获得下拉值。



i我正在使用....

Dear All,

I am using Gridview in c# for my web app. I created a Dynamically Dropdown using Dyanamically Created Template.

but i am not able to get the value of dropdown to store in DB.

So, how can i get the value of dropdown from the each column.

i am using ....

public class AddTemplateToGridView : ITemplate
    {
        ListItemType _type;
        string _colName;
 
        public AddTemplateToGridView(ListItemType type, string colname)
        {
            _type = type;
            _colName = colname;
        }
 
        void ITemplate.InstantiateIn(System.Web.UI.Control container)
        {
            switch (_type)
            {
                case ListItemType.Item:
 
                    DropDownList ht = new DropDownList();
                    ht.ID = "ht"+_colName; 
                    ht.Width = 50;
                    ht.Items.Add(new ListItem("Select", "Select"));
                    ht.Items.Add(new ListItem("P", "P"));
                    ht.Items.Add(new ListItem("A", "A"));
                    ht.Items.Add(new ListItem("H", "H"));
                    ht.Items.Add(new ListItem("S", "S"));
                    ht.Items.Add(new ListItem("L", "L"));
                    ht.DataBinding += new EventHandler(ht_DataBinding);
                    container.Controls.Add(ht);
                    break;
                   
            }
        }
 
        void ht_DataBinding(object sender, EventArgs e)
        {
            DropDownList ddl = (DropDownList)sender;
            GridViewRow container = (GridViewRow)ddl.NamingContainer;
           
        }
    }

点击按钮：

on button click :

       DataTable dt = new DataTable();

        DataColumn dcol = new DataColumn(NAME, typeof(System.String));
        dt.Columns.Add(dcol);

        //Create an ID column for adding to the Datatable

        int year = DateTime.Now.Year;
        int month = DateTime.Now.Month;
        int days = DateTime.DaysInMonth(year, month);

        string s = "select name from empl where id=''" + Session["user"].ToString() + "''";
        SqlDataAdapter ad = new SqlDataAdapter(s, c.getcon());
        DataSet ds = new DataSet();
        ad.Fill(ds);

        if (ds.Tables[0].Rows.Count != 0)
        {
            string report_person = "Select name from empl where report_to_whom=''" + ds.Tables[0].Rows[0][0].ToString() + "''";
            SqlDataAdapter ad1 = new SqlDataAdapter(report_person, c.getcon());
            DataSet ds1 = new DataSet();
            ad1.Fill(ds1);

            if (ds1.Tables[0].Rows.Count != 0)
            {
                for (int nIndex = 0; nIndex < ds1.Tables[0].Rows.Count; nIndex++) // FOR CREATE A NUMBER OF ROW 
                {
                   
                    DataRow drow = dt.NewRow();
                    drow[NAME] = ds1.Tables[0].Rows[nIndex][0].ToString();
                    
                    for (int k = 1; k <= days; k++) // FOR CREATE A COLUMN DYNAMICALLY
                    {

                        int month1 = DateTime.Today.Month;
                        int year1 = DateTime.Today.Year;
                        string sdate = (k) + "/" + month1 + "/" + year1;
                        string sdate1 = Convert.ToDateTime(sdate).ToString("MM/dd/yyyy");

                       //GridView gv = Form.FindControl("myGridView") as GridView;
                        foreach (GridViewRow item in GridView1.Rows)
                        {
                           DropDownList d1 = (DropDownList)item.FindControl("htDay1");
                        }
                        //string s1 = "insert into attendance(user_name,attendance_date,flag) values(''" + ds1.Tables[0].Rows[nIndex][0].ToString() + "'',''"+sdate1+"'',''"+ddl.SelectedItem.Value+"'')";
                        //c.InsertData(s1);
                    }
                }
            }

        }


here, d+k is containg the column name .

how can i get the value and store in db.

i get null always.


plz help me. 

Mitesh

推荐答案

正确的语法

Correct syntax

DropDownList d1 =((DropDownList)(item.Controls[0].Controls[3])).SelectedValue

item.Controls [0]是第一个单元格控件index.Controls [3]我的控件索引

item.Controls[0] is first cell controls index.Controls[3] my control index

这篇关于价值无法从动态下拉中获得的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！