以编程方式将模板字段添加到Gridview [英] Adding Template Field to Gridview Programmatically

问题描述

我想在按钮点击事件中将模板字段添加到gridview中。以下是我的代码工作正常但只有一次，所以请告诉我如何在按钮点击上添加多行。

Hi,
I want to add template field into the gridview on button click event. Following is my code which is working fine but only for one time so please let me know to how add multiple rows on button click.

 private void SetInitialRow()
        {
            DataTable dt = new DataTable();

                if (ddlBroker.SelectedIndex > 0 && ViewState["CurrentTable"] == null) 
                {
                    objBEL.Broker_id = int.Parse(ddlBroker.SelectedValue.ToString());
                    objBEL.city_id = objBLL.GetCityId(objBEL);
                    dt = objBLL.GetRecords(objBEL);

     
                    if (dt.Rows.Count > 0)
                    {

                        DataRow dr = null;

                        gdvRates.DataSource = ViewState["CurrentTable"];
                        gdvRates.DataBind();

                        dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
                        dr = dt.NewRow();
                        dr["RowNumber"] = 1;
                        dr["Subcommodity_name"] = string.Empty;
                        dr["City_name"] = string.Empty;
                        dr["Brand_Name"] = string.Empty;
                        dr["Brand_Desc"] = string.Empty;
                        dr["Min_Rate"] = DBNull.Value;
                        dr["Max_Rate"] = DBNull.Value;
                        dr["Brand_Abbr"] = string.Empty;
                        dr["Brand_Id"] = DBNull.Value;
                        dr["Rate_id"] = DBNull.Value;

                        dt.Rows.Add(dr);

                        ViewState["CurrentTable"] = dt;

                        gdvRates.DataSource = ViewState["CurrentTable"];
                        gdvRates.DataBind();


                    }
                }

                else
                {
                    DataRow dr = null;
dt = (DataTable)ViewState["CurrentTable"];

                 //   gdvRates.DataSource = ViewState["CurrentTable"];
                  //  gdvRates.DataBind();

                    dt.Columns.Add(new DataColumn("RowNumber", typeof(string)));
                    dt.Columns.Add(new DataColumn("Subcommodity_name", typeof(string)));
                    dt.Columns.Add(new DataColumn("City_name", typeof(string)));
                    dt.Columns.Add(new DataColumn("Brand_Name", typeof(string)));
                    dt.Columns.Add(new DataColumn("Brand_Abbr", typeof(string)));
                    dt.Columns.Add(new DataColumn("Brand_Desc", typeof(string)));
                    dt.Columns.Add(new DataColumn("Min_Rate", typeof(string)));
                    dt.Columns.Add(new DataColumn("Max_Rate", typeof(string)));
                    dt.Columns.Add(new DataColumn("Brand_Id", typeof(string)));
                    dt.Columns.Add(new DataColumn("Rate_id", typeof(string)));

                    dr = dt.NewRow();
                    dr["RowNumber"] = 1;
                    dr["Subcommodity_name"] = string.Empty;
                    dr["City_name"] = string.Empty;
                    dr["Brand_Name"] = string.Empty;
                    dr["Brand_Desc"] = string.Empty;
                    dr["Min_Rate"] = DBNull.Value;
                    dr["Max_Rate"] = DBNull.Value;
                    dr["Brand_Abbr"] = string.Empty;
                    dr["Brand_Id"] = DBNull.Value;
                    dr["Rate_id"] = DBNull.Value;

                    dt.Rows.Add(dr);

                    ViewState["CurrentTable"] = dt;

                    gdvRates.DataSource = ViewState["CurrentTable"];
                    gdvRates.DataBind();


                }
                       
        }

提前致谢。

Thanks in advance.

推荐答案

在每个帖子上，您的动态数据都会丢失。因此，您需要再次重新创建该数据，或者您可以将该数据放在Session或ViewState中，并从SetInitialRow方法中的那里检索它。这就是为什么它让你觉得它只能工作一次。

On every post back your dynamic data is lost. So you need to recreate that data again or you can put that data in Session or ViewState and retrieve it from there inside SetInitialRow method. That's why its giving you impression that its working only once.

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