C# DataTable在绑定到GridView时丢失了数据

我有一个gridview，它有14列，其中一列用于

ProductUID

，这是不可见的，另一列是文本框，其中包含

AutoCompleteExtender

我使用此文本框选择产品名称<代码>填充网格视图功能填充选定产品的网格视图。但问题是，当我添加新产品时，我首先调用

AddNewRow（）

函数。它在gridview上添加了新行，然后调用

fillgridview（）

函数。它用所选产品的详细信息填充所有列

之后，当我在下一行添加另一个新产品时，它将丢失以前的行，只保留第一个单元格数据和其他列

我的源代码有什么问题

请帮帮我

private void AddNewRow()
    {
        try
        {
            int rowIndex = 0;
            if (Session["CurrentTable"] != null)
            {
                DataTable dtCurrentTable = (DataTable)Session["CurrentTable"];
                DataRow drCurrentRow = null;

                if (dtCurrentTable.Rows.Count > 0)
                {
                    for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                    {
                        string boundfield0 = gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.ProductID].Text;
                        TextBox TextBoxItemName =
                          (TextBox)gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.ItemName].FindControl("item_txtBox");
                        string boundfield1 = gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.Company].Text;
                        string boundfield2 = gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.Packing].Text;
                        string boundfield3 = gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.Unit].Text;
                        string boundfield4 = gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.Expiry].Text;
                        string boundfield5 = gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.MRP].Text;
                        string boundfield6 = gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.ShelfNo].Text;
                        string boundfield7 = gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.BatchNo].Text;
                        string boundfield8 = gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.Stock].Text;
                        TextBox TextBoxQuantity =
                          (TextBox)gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.Quantity].FindControl("qty_txtBox");
                        string boundfield9 = gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.Amount].Text;
                        Button ButtonRemove =
                          (Button)gvCounterSale.Rows[rowIndex].Cells[(int)CounterSaleColumnIndex.Button].FindControl("btnRemove");

                        drCurrentRow = dtCurrentTable.NewRow();
                        drCurrentRow["RowNumber"] = i + 1;

                        dtCurrentTable.Rows[i - 1]["ProductID"] = boundfield0;
                        dtCurrentTable.Rows[i - 1]["Col1"] = TextBoxItemName.Text;
                        dtCurrentTable.Rows[i - 1]["Company"] = boundfield1;
                        dtCurrentTable.Rows[i - 1]["Packing"] = boundfield2;
                        dtCurrentTable.Rows[i - 1]["Unit"] = boundfield3;
                        dtCurrentTable.Rows[i - 1]["Expiry"] = boundfield4;
                        dtCurrentTable.Rows[i - 1]["Pur_Rate"] = boundfield5;
                        dtCurrentTable.Rows[i - 1]["Shelf_No"] = boundfield6;
                        dtCurrentTable.Rows[i - 1]["Batch_No"] = boundfield7;
                        dtCurrentTable.Rows[i - 1]["Stock"] = boundfield8;
                        dtCurrentTable.Rows[i - 1]["Col10"] = TextBoxQuantity.Text;
                        dtCurrentTable.Rows[i - 1]["Amount"] = boundfield9;
                        dtCurrentTable.Rows[i - 1]["Col11"] = ButtonRemove;
                        rowIndex++;
                    }
                    dtCurrentTable.Rows.Add(drCurrentRow);
                    Session["CurrentTable"] = dtCurrentTable;
                    gvCounterSale.DataSource = dtCurrentTable;
                    gvCounterSale.DataBind();
                }
            }
            else
            {
                Response.Write("Session is null");
            }
            SetPreviousData();
        }
        catch (Exception ex)
        {
            ScriptManager.RegisterStartupScript(Page, this.GetType(), "hi", "alert('Error Occured');", true);
        }
    }

 private void FillGridView()
    {
        try
        {
            Guid puid = new Guid();
            puid = System.Guid.ParseExact(hdnProductId.Value, "D");
            int rowIndex = gvCounterSale.Rows.Count - 1;
            DataTable dtCurrentTable = (DataTable)Session["CurrentTable"];

            string connStr = ConfigurationManager.ConnectionStrings["pharmacy_ConnectionString"].ConnectionString;
            SqlConnection con = new SqlConnection(connStr);
            con.Open();
            SqlDataReader dr = null;

            if (dtCurrentTable.Rows.Count > 0)
            {
                for (int i = 1; i < gvCounterSale.Rows.Count; i++)
                {
                    if (rowIndex != gvCounterSale.Rows.Count)
                    {
                        StringBuilder sb = new StringBuilder();
                        sb.Append(" SELECT STOCK.PRODUCT_ID, STOCK.BATCH_NO, STOCK.COMPANY_NAME, STOCK.EXPIRY, STOCK.PUR_RATE, STOCK.MRP, STOCK.SHELF_NO, ");
                        sb.Append(" STOCK.OPENING_STOCK, PRODUCT.PRODUCT_ID, PRODUCT.UNIT, PRODUCT.PACKING ");
                        sb.Append(" FROM STOCK INNER JOIN PRODUCT ");
                        sb.Append(" ON STOCK.PRODUCT_ID=PRODUCT.PRODUCT_ID WHERE PRODUCT.PRODUCT_ID = '" + puid + "'GROUP BY STOCK.PRODUCT_ID, STOCK.BATCH_NO, STOCK.COMPANY_NAME, ");
                        sb.Append("STOCK.EXPIRY, STOCK.PUR_RATE, STOCK.MRP, STOCK.SHELF_NO, STOCK.OPENING_STOCK, PRODUCT.PRODUCT_ID, PRODUCT.UNIT, PRODUCT.PACKING ");
                        SqlCommand cmdid = new SqlCommand(sb.ToString(), con);
                        dr = cmdid.ExecuteReader();
                        while (dr.Read())
                        {
                            gvCounterSale.Rows[rowIndex - 1].Cells[(int)CounterSaleColumnIndex.ProductID].Text = puid.ToString();
                            gvCounterSale.Rows[rowIndex - 1].Cells[(int)CounterSaleColumnIndex.Packing].Text = dr["PACKING"].ToString();
                            gvCounterSale.Rows[rowIndex - 1].Cells[(int)CounterSaleColumnIndex.Unit].Text = dr["UNIT"].ToString();
                            DateTime dt = Convert.ToDateTime(dr["EXPIRY"].ToString());
                            gvCounterSale.Rows[rowIndex - 1].Cells[(int)CounterSaleColumnIndex.Company].Text = dr["COMPANY_NAME"].ToString();
                            gvCounterSale.Rows[rowIndex - 1].Cells[(int)CounterSaleColumnIndex.Expiry].Text = dt.ToShortDateString();
                            gvCounterSale.Rows[rowIndex - 1].Cells[(int)CounterSaleColumnIndex.MRP].Text = dr["MRP"].ToString();
                            gvCounterSale.Rows[rowIndex - 1].Cells[(int)CounterSaleColumnIndex.ShelfNo].Text = dr["SHELF_NO"].ToString();
                            gvCounterSale.Rows[rowIndex - 1].Cells[(int)CounterSaleColumnIndex.BatchNo].Text = dr["BATCH_NO"].ToString();
                            gvCounterSale.Rows[rowIndex - 1].Cells[(int)CounterSaleColumnIndex.Stock].Text = dr["OPENING_STOCK"].ToString();
                        }
                        //rowIndex++;
                        dr.Close();
                    }
                }
                con.Close();
            }
        }
        catch (Exception ex)
        {
            ScriptManager.RegisterStartupScript(Page, this.GetType(), "hi", "alert('Error Occured');", true);
        }
    }

private void AddNewRow（）
{
尝试
{
int rowIndex=0；
if（会话[“CurrentTable”]！=null）
{
DataTable dtCurrentTable=（DataTable）会话[“CurrentTable”]；
DataRow drCurrentRow=null；
如果（dtCurrentTable.Rows.Count>0）
{
对于（int i=1；i 0）
{
对于（int i=1；i

在这里，你必须做点什么

class SessionHepler
         {
              public static DataTable OldTable
                 {
                  get;
                  set;
                  }
            }

//在-->Session[“CurrentTable”]=dtCurrentTable之前将其写入代码中

SeeionHelper.OldTable = dtCurrentTable;

现在您将拥有旧的表值…因此您可以将其分配给当前表

像

---

因此，第一次OldTable将为空，它将创建，然后从第二次开始，它将OldTable分配给dtCurrentTable…像这样尝试

如果您在asp页面中单击任何内容，它将得到刷新，这样您的数据表数据可能会丢失，…创建一个类并创建一个数据表属性，并将您的当前表设置为该属性，以便在需要时重新创建新网格将旧数据表附加到新数据表中，这样您的数据将保留在前面Hanks Arvind.请详细解释我解释了整件事Akshay…接受答案…如果有效..SetPreviousData（）在AddNewRow（）中具体做了什么？注释掉该行会影响您的问题吗？

if(SeeionHelper.OldTable ==null)
      {
         dtCurrentTable = new DataTable();
        }
 else
   {
      dtCurrentTable = new DataTable();
      dtCurrentTable = SeeionHelper.OldTable;
    }