數據後部分回發

Question

我已經使用更新面板，並在更新面板我一直在我動態又包含1名下拉列表和3個文本框創建行ASP表控制丟失。我的問題是，發現部分回發文本框和下拉列表後，但文本框的文本屬性顯示爲空，下拉列表的選定值設置爲該框中的第一條記錄。我還在會話中存儲了整個表，並在page_load事件的（！isPostBack）條件中檢索它。請指導我如何解決這個問題？我的.aspx頁面中的

部分如下

<td colspan="2"> 
       <asp:ScriptManager ID="ScriptManager1" runat="server"> 
       </asp:ScriptManager> 
       <asp:UpdatePanel ID="UpdatePanel1" runat="server" EnableViewState="true"> 
       <ContentTemplate> 
        <table class="style1"> 
        <tr> 
        <td> 
         <table class="style1" border="1"> 
         <tr> 
          <td width="120"> 
           <asp:Label ID="QualificationLbl" runat="server" Text="Qualification"></asp:Label>           </td> 
              <td width="100"> 
               <asp:Label ID="PercentageLbl" runat="server" Text="Percentage"></asp:Label> 
              </td> 
              <td width="100"> 
               <asp:Label ID="YearLbl" runat="server" Text="Passing Year"></asp:Label> 
              </td> 
              <td width="*"> 
               <asp:Label ID="InstituteLbl" runat="server" Text="Institute Name" Width="120px" 
                onprerender="InstituteLbl_PreRender"></asp:Label> 
              </td> 
             </tr> 
             <tr> 
              <td colspan="4" align="left"> 
               <asp:PlaceHolder ID="PlaceHolder" runat="server"></asp:PlaceHolder> 
               <asp:Table ID="Table1" runat="server"> 
               </asp:Table> 
              </td> 
             </tr> 
            </table> 
           </td> 
          </tr> 
          <tr> 
           <td align="right"> 
            <asp:Button ID="addRowBtn" runat="server" onclick="addRowBtn_Click" 
             Text="Add New Row" /> 
           </td> 
          </tr> 
         </table> 
        </ContentTemplate> 
        <Triggers> 
        <asp:AsyncPostBackTrigger ControlID="addRowBtn" EventName="Click" /> 
        </Triggers> 

      </asp:UpdatePanel> 
      <br /> 
    </td> 

和我.aspx.cs頁面如下

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Data; 
using System.Data.SqlClient; 
using AppResumeMaster; 
using AppQualificationDetail; 


public partial class Applicant_ApplicationForm : System.Web.UI.Page 
{ 
    int Rows = 1; 
    protected void Page_Load(object sender, EventArgs e) 
    { 
    if (!IsPostBack) 
    { 
     generateTable(Rows); 
    } 
    else 
    { 
     Table ReturnedTable = new Table(); 
     ReturnedTable = (Table)Session["Table"]; 
     int rowCount = ReturnedTable.Rows.Count; 
     int colCount = 4; 

     DropDownList objList = new DropDownList(); 
     TextBox txtBox = new TextBox(); 
     if (ReturnedTable != null) 
     { 
      for (int Rcount = 0; Rcount < rowCount; Rcount++) 
      { 
       for (int Ccount = 0; Ccount < colCount; Ccount++) 
       { 
        if (Ccount == 0) 
        { 
         objList = (DropDownList)ReturnedTable.Rows[Rcount].Cells[Ccount].FindControl("DropDownList(" + Rcount + "," + Ccount + ")"); 
         objList.SelectedValue = ((DropDownList)ReturnedTable.Rows[Rcount].Cells[Ccount].FindControl("DropDownList(" + Rcount + "," + Ccount + ")")).SelectedValue; 
        } 
        else 
        { 
         txtBox = (TextBox)ReturnedTable.Rows[Rcount].Cells[Ccount].FindControl("TextBox(" + Rcount + "," + Ccount + ")"); 
         txtBox.Text = ((TextBox)ReturnedTable.Rows[Rcount].Cells[Ccount].FindControl("TextBox(" + Rcount + "," + Ccount + ")")).Text; 
         //txtBox.Text = Request.Params["TextBox(" + Rcount + "," + Ccount + ")"]; 
        } 
       } 
      } 

     } 
    } 

} 
protected void saveBtn_Click(object sender, EventArgs e) 
{ 
} 
protected void addRowBtn_Click(object sender, EventArgs e) 
{ 

    if (ViewState["rowCount"] != null) 
    { 
     Rows = Convert.ToInt32(ViewState["rowCount"].ToString()); 
     generateTable(Rows); 
    } 

} 
public void generateTable(int rowCount) 
{ 
    try 
    { 
     int colCount = 4; 
     DropDownList objDropDownList; 
     for (int Row = 0; Row < rowCount; Row++) 
     { 
      TableRow objTablerow = new TableRow(); 

      for (int cols = 0; cols < colCount; cols++) 
      { 
       TableCell objTableCell = new TableCell(); 
       if (cols == 0) 
       { 
        objDropDownList = new DropDownList(); 
        objDropDownList.Width = 120; 
        objTableCell.Controls.Add(objDropDownList); 

        DataOperation objDataoperation = new DataOperation(); 
        DataSet ds = new DataSet(); 
        ds = objDataoperation.DropDownList("select * from tblQualificationMaster"); 

        objDropDownList.DataValueField = ds.Tables[0].Columns[0].ToString(); 
        objDropDownList.DataTextField = ds.Tables[0].Columns[1].ToString(); 
        objDropDownList.DataSource = ds.Tables[0]; 
        objDropDownList.DataBind(); 

        objDropDownList.ID = "DropDownList(" + Row + "," + cols + ")"; 
        objTableCell.Controls.Add(objDropDownList); 
        objTablerow.Controls.Add(objTableCell); 
       } 
       else 
       { 
        TextBox objTextBox = new TextBox(); 
        objTextBox.ID = "TextBox(" + Row + "," + cols + ")"; 
        objTableCell.Controls.Add(objTextBox); 
        objTablerow.Controls.Add(objTableCell); 
       } 
      } 

      Table1.Rows.Add(objTablerow); 

     } 
     rowCount++; 
     ViewState["rowCount"] = rowCount; 
    } 
    catch (Exception ex) 
    { 
     throw ex; 
    } 
} 
protected void InstituteLbl_PreRender(object sender, EventArgs e) 
{ 
    Session.Add("Table", Table1); 
} 
} 

我想通過對每一個addRowTbn點擊事件中添加一行有保留以前的行。

Answer 1

從我第一次看通過，你正試圖將下拉列表的選擇的價值和你存儲在會話表中的文本框的文本價值，但你的用戶之前存儲在該表中的會話有機會做出改變到價值。