（ASP.NET - C＃）在將listbox中的textbox.text存儲到數據表時遇到問題

Question

我試圖在單擊鏈接按鈕lnkUpdate後保存輸入到文本框中的數據。當我點擊lnkupdate時，似乎數據表沒有變化。

ASPX代碼

<div class="col-md-7"> 
       <div class="well well-sm"> 
        <fieldset> 
         <legend>Warehouse</legend> 
         <div class="container-fluid"> 
          <div class="panel panel-default"> 
           <table class="table table-bordered table-hover table-responsive"> 
            <thead> 
             <tr> 
              <td><strong>#</strong></td>           
              <td><strong>BranchName</strong></td> 
              <td><strong>Quantity</strong></td> 
              <td><strong>Critical Level</strong></td> 
              <td></td> 
             </tr> 
            </thead> 
            <tbody> 
            <asp:ListView ID="lvWarehouse" runat="server" 
              onitemediting="lvWarehouse_ItemEditing" 
              onitemcanceling="lvWarehouse_ItemCanceling" 
              onitemupdating="lvWarehouse_ItemUpdating"> 
             <ItemTemplate> 
              <tr> 
               <td><%# Eval("BranchID") %></td> 
               <td><%# Eval("BranchName") %></td> 
               <td><%# Eval("Quantity") %></td> 
               <td><%# Eval("CriticalLevel") %></td> 
               <td> 
                <asp:LinkButton ID="btnEdit" runat="server" class="glyphicon glyphicon-pencil" CommandName="Edit" /> 
               </td> 
              </tr> 
             </ItemTemplate> 
             <EditItemTemplate> 
              <tr> 
               <td><asp:Label ID="lblID" runat="server" Text='<%# Eval("BranchID") %>' /></td> 
               <td><asp:Label ID="lblBranchName" runat="server" Text='<%# Eval("BranchName") %>' /></td> 
               <td><asp:TextBox ID="txtQty" runat="server" class="form-control input-sm" Text='<%# Eval("Quantity") %>' /></td> 
               <td><asp:TextBox ID="txtCritical" runat="server" class="form-control input-sm" Text='<%# Eval("CriticalLevel") %>' /></td> 
               <td> 
                <asp:LinkButton ID="lnkUpdate" runat="server" class="glyphicon glyphicon-ok" CommandName="Update" /> 
                <asp:LinkButton ID="lnkCancel" runat="server" class="glyphicon glyphicon-remove" CommandName="Cancel" /> 
               </td> 
              </tr> 
             </EditItemTemplate> 
            </asp:ListView> 

            </tbody> 
           </table>  
          </div> 

         </div> 
        </fieldset> 
       </div> 
      </div> 

的.cs代碼

SqlConnection con = new SqlConnection(Helper.GetCon()); 
    DataTable ProdDetails; 

    protected void Page_Load(object sender, EventArgs e) 
    { 
     if (!IsPostBack) 
     { 
      GetSuppliers(); 
      GetProdDetails(); 

     } 
    } 

    void GetSuppliers() 
    { 
     con.Open(); 
     SqlCommand cmd = new SqlCommand(); 
     cmd.Connection = con; 
     cmd.CommandText = "SELECT SupplierID, SupplierName FROM Suppliers"; 
     SqlDataReader data = cmd.ExecuteReader(); 
     ddlSupplierName.DataSource = data; 
     ddlSupplierName.DataTextField = "SupplierName"; 
     ddlSupplierName.DataValueField = "SupplierID"; 
     ddlSupplierName.DataBind(); 
     con.Close(); 
    } 

    void GetProdDetails() 
    { 
     ProdDetails = (DataTable)Session["proddetails"]; 

     if (ProdDetails == null) 
     { 
      con.Open(); 
      SqlCommand cmd = new SqlCommand(); 
      cmd.Connection = con; 
      cmd.CommandText = "SELECT b.BranchID, b.BranchName, pd.QtyonHand AS Quantity, " + 
       "pd.CriticalLevel FROM Branches AS b LEFT JOIN ProductDetails AS pd ON b.BranchID=pd.BranchID"; 
      SqlDataAdapter data = new SqlDataAdapter(cmd); 
      ProdDetails = new DataTable(); 
      data.Fill(ProdDetails); 

      DataRow[] rowList = ProdDetails.Select(); 
      foreach (DataRow dr in rowList) 
      { 
       dr["Quantity"] = "0"; 
       dr["CriticalLevel"] = "0"; 
      } 

      lvWarehouse.DataSource = ProdDetails; 
      lvWarehouse.DataBind(); 
      con.Close(); 
      Session["proddetails"] = ProdDetails; 
     } 
     else 
     { 
      lvWarehouse.DataSource = ProdDetails; 
      lvWarehouse.DataBind(); 
      Session["proddetails"] = ProdDetails; 
     } 
     TotalQuantity(); 
    } 

    void TotalQuantity() 
    { 
     int total = 0; 
     for (int nRow = 0; nRow <= ProdDetails.Rows.Count - 1; nRow++) 
     { 
      int qty = int.Parse(ProdDetails.Rows[nRow]["Quantity"].ToString()); 
      total = total + qty; 
     } 
     txtQuantity.Text = total.ToString(); ; 
    } 

protected void lvWarehouse_ItemUpdating(object sender, ListViewUpdateEventArgs e) 
    { 
     GetProdDetails(); 
     string lblID = (lvWarehouse.Items[e.ItemIndex].FindControl("lblID") as Label).Text; 
     TextBox Qty = (TextBox)lvWarehouse.Items[e.ItemIndex].FindControl("txtQty"); 
     string txtQty = (lvWarehouse.Items[e.ItemIndex].FindControl("txtQty") as TextBox).Text; 
     string txtCritical = (lvWarehouse.Items[e.ItemIndex].FindControl("txtCritical") as TextBox).Text; 
     foreach (DataRow row in ProdDetails.Rows) 
     { 
      if (row["BranchID"].ToString() == lblID) 
      { 
       row["Quantity"] = Qty.Text; 
       row["CriticalLevel"] = txtCritical; 
       break; 
      } 
     } 
     lvWarehouse.EditIndex = -1; 
     GetProdDetails(); 
    } 

Answer 1

www.codedigest.com/Articles/ASPNET/105_EditUpdateDelete_and_Insert_in_ListView_Control.aspx refer this