遇到一个问题 帮忙解决下 谢谢了

Question

ASPX页面的代码： 
  <asp:GridView ID="gv_Order" runat="server" AutoGenerateColumns="False" Width="921px" DataKeyNames="OrderCode" OnRowCreated="gv_Order_RowCreated"> 
              <Columns> 
                  <asp:TemplateField HeaderText="订单编号"> 
                      <ItemTemplate> 
                          <asp:TextBox ID="txtOrderCode" runat="server" Text=' <%#   DataBinder.Eval(Container.DataItem,   "OrderCode")%>' Width="131px"> </asp:TextBox> 
                      </ItemTemplate> 
                  </asp:TemplateField> 
                  <asp:TemplateField HeaderText="产品名称"> 
                  <ItemTemplate> 
                   <asp:DropDownList   ID="ddlP"   runat="server"      AutoPostBack=true SelectedValue=' <%#   DataBinder.Eval(Container.DataItem,   "PCode")%>'>    
                                                          
                                                   </asp:DropDownList>  
                              
                         </ItemTemplate> 
                         
                   
                  </asp:TemplateField> 
                  <asp:TemplateField HeaderText="订购数量"> 
                      <ItemTemplate> 
                          <asp:TextBox ID="txtNumber" runat="server" Text=' <%#   DataBinder.Eval(Container.DataItem,   "Number")%>' Width="69px"> </asp:TextBox> 
                      </ItemTemplate> 
                  </asp:TemplateField> 
                  <asp:TemplateField HeaderText="优惠率"> 
                      <ItemTemplate> 
                          <asp:TextBox ID="txtDiscount" runat="server" Text=' <%#   DataBinder.Eval(Container.DataItem,   "Discount")%>' Width="61px"> </asp:TextBox> 
                      </ItemTemplate> 
                  </asp:TemplateField> 
                  <asp:TemplateField HeaderText="订货日期"> 
                      <ItemTemplate> 
                          <asp:TextBox ID="txtDate" runat="server" Text=' <%#   DataBinder.Eval(Container.DataItem,   "Date")%>' Width="131px"> </asp:TextBox> 
                      </ItemTemplate> 
                  </asp:TemplateField> 
                  <asp:TemplateField HeaderText="送货日期"> 
                  <ItemTemplate> 
                  <input id="txtTime" runat="server" name="Text1" onfocus="calendar()" onkeypress="return false" 
               onselectstart="return false;" readonly="readonly" style="width: 131px" type="text"  value=' <%#   DataBinder.Eval(Container.DataItem,   "DeliveGoodsDate")%>'/> 
                  </ItemTemplate> 
                  </asp:TemplateField> 
                  <asp:TemplateField HeaderText="出库状态"> 
                  
                  <ItemTemplate>    
                    <asp:DropDownList   ID="ddlS"   runat="server"     SelectedValue=' <%#   DataBinder.Eval(Container.DataItem,   "M_IsStock")%>'>    
                                    <asp:ListItem   Value="1">已出库 </asp:ListItem>    
                                     <asp:ListItem   Value="0">未出库 </asp:ListItem>    
                       </asp:DropDownList>    
                   </ItemTemplate>  
                  </asp:TemplateField> 
                  <asp:TemplateField HeaderText="收款状态"> 
                  <ItemTemplate>    
                       <asp:DropDownList   ID="ddlM"   runat="server"     SelectedValue=' <%#   DataBinder.Eval(Container.DataItem,   "M_IsMoney")%>'>    
                                                           <asp:ListItem   Value="1">已收款 </asp:ListItem>    
                                                           <asp:ListItem   Value="0">未收款 </asp:ListItem>    
                        </asp:DropDownList>    
                   </ItemTemplate>  
                  </asp:TemplateField> 
                  <asp:CommandField ShowDeleteButton="True" /> 
              </Columns> 
          </asp:GridView> 
CS页面代码： 
 BLL.TC_ClientInfo bll = new BLL.TC_ClientInfo(); 
        protected void Page_Load(object sender, EventArgs e) 
        { 
            if (!IsPostBack) 
            { 
                BindTestData();  
            }  
        } 
        private void DDListM() 
        { 
           //绑定DropDownList  
            //drlP.Items.Clear(); 
            DataTable dtM = bll.GetTP_ProductInfo(); 
            ddlP.DataSource = dtM; 
            ddlP.DataTextField = "Name"; 
            ddlP.DataValueField = "Code"; 
            ddlP.DataBind(); 
        } 
        protected void BindTestData() 
        { 
            string strCode = ""; 
            //读取此用户以前订单信息数据绑定gv_Order    
            DataTable dt1 = new DataTable("TableOrder"); 
            dt1 = bll.GetTS_OrderInfo(strCode); 
             
            this.gv_Order.DataSource = dt1; 
            this.gv_Order.DataBind(); 
        } 
        protected DataTable GetDataFromGrid() 
        { 
            string strCode = ""; 
            DataTable dt1 = new DataTable("TableOrder"); 
            dt1 = bll.GetTS_OrderInfo(strCode); 
            for (int i = 0; i  < gv_Order.Rows.Count; i++) 
            { 
                GridViewRow gRow = gv_Order.Rows[i]; 
                DataRow newRow = dt1.NewRow(); 
                newRow[0] = ((TextBox)gRow.FindControl("OrderCode")).Text; 
                newRow[1] = ((DropDownList)gRow.FindControl("PCode")). 
                newRow[2] = ((TextBox)gRow.FindControl("Number")).Text; 
                newRow[3] = ((TextBox)gRow.FindControl("Discount")).Text; 
                newRow[4] = DateTime.Now.ToString(); 
                newRow[5] = ((TextBox)gRow.FindControl("txtTime")).Text; 
                newRow[6] = ((DropDownList)gRow.FindControl("ddlS")).SelectedValue; 
                newRow[7] = ((DropDownList)gRow.FindControl("ddlM")).SelectedValue; 
                dt1.Rows.Add(newRow); 
            } 
            dt1.AcceptChanges(); 
            return dt1; 
        } 
        protected void btnPr_Click(object sender, EventArgs e) 
        { 
             
            DataTable dt = this.GetDataFromGrid(); 
            DataRow newRow = dt.NewRow(); 
            //newRow["PCode"] = "1"; 
            newRow["OrderCode"] = bll.GetNewIDOrder(); 
            newRow["M_IsStock"] = "0"; 
            newRow["M_IsMoney"] = "0"; 
            dt.Rows.Add(newRow); 
            this.gv_Order.DataSource = dt; 
            this.gv_Order.DataBind(); 
        } 
        protected void gv_Order_RowCreated(object sender, GridViewRowEventArgs e) 
        { 
            GridView g = (GridView)sender; 
            if (g.Rows.Count == 0) 
            { 
                return; 
            } 
            DropDownList ddl = (DropDownList)g.Rows[g.Rows.Count - 1].FindControl("ddlP"); 
            if (ddl != null) 
            { 
                object[] array = new object[] { DateTime.Now.ToString() }; 
                ddl.DataSource = array; 
                ddl.DataBind(); 
                //自定义初始化操作 
                DDListM();  
            }          } 出现问题是： 
“ddlP”有一个无效 SelectedValue，因为它不在项目列表中。 
参数名: value   
protected void btnPr_Click(object sender, EventArgs e) 
        { 
             
            DataTable dt = this.GetDataFromGrid(); 
            DataRow newRow = dt.NewRow(); 
            //newRow["PCode"] = "1"; 
            newRow["OrderCode"] = bll.GetNewIDOrder(); 
            newRow["M_IsStock"] = "0"; 
            newRow["M_IsMoney"] = "0"; 
            dt.Rows.Add(newRow); 
            this.gv_Order.DataSource = dt; 
            this.gv_Order.DataBind();//就是执行到这里出错的    
        } 
非常着急  ，可以QQ帮我下：274135279或MSN：[email protected]

Answer 1

<asp:DropDownList   ID="ddlP"   runat="server"      AutoPostBack=true SelectedValue='  <%#   DataBinder.Eval(Container.DataItem,   "PCode")%>'>     
</asp:DropDownList>   
=========
你得查询语句中是否包含了PCode字段

Answer 2

private void DDListM() 
        { 
           //绑定DropDownList  
            //drlP.Items.Clear(); 
            DataTable dtM = bll.GetTP_ProductInfo(); 
            ddlP.DataSource = dtM; 
            ddlP.DataTextField = "Name"; 
            ddlP.DataValueField = "Code"; 
            ddlP.DataBind(); 
        }  是code 还是pcode?

Answer 3

<%#   DataBinder.Eval(Container.DataItem,   "PCode")%>
在
protected void gv_Order_RowCreated(object sender, GridViewRowEventArgs e)  
        {  
            GridView g = (GridView)sender;  
            if (g.Rows.Count == 0)  
            {  
                return;  
            }  
            DropDownList ddl = (DropDownList)g.Rows[g.Rows.Count - 1].FindControl("ddlP");  
            if (ddl != null)  
            {  
                object[] array = new object[] { DateTime.Now.ToString() };  
                ddl.DataSource = array;  
                ddl.DataBind();  
                //自定义初始化操作  
                DDListM();   
            }           }  之前执行了。