閱讀從gridview下拉列表的值

Question

我有一個下拉列表列的gridview，我啓用了分頁功能。問題在於它每次轉到下一頁後，上一頁上的下拉列表的選定值將恢復爲默認值。

我試着用if(!ispostback)包住代碼，只在第一頁提供的其他頁面消失

protected void Page_Load(object sender, EventArgs e) 
    { 
     if (!IsPostBack) 
     { 
      List<CPDEmployee> employeelist = (List<CPDEmployee>)Cache["EmployeeList"]; 

      unverifiedlist.DataSource = employeelist; 
      unverifiedlist.AllowPaging = true; 
      unverifiedlist.PageSize = 10; 
      unverifiedlist.DataBind(); 
     } 
    } 
protected void PageSelect_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    int page = int.Parse(PageSelect.SelectedItem.Text); 
    unverifiedlist.PageIndex = page; 
    DataBind(); 
} 





<asp:GridView ID="unverifiedlist" runat="server" AutoGenerateColumns="false" AllowSorting="true" AllowPaging="true" ViewStateMode="Enabled"> 
         <Columns><asp:TemplateField HeaderText="Options" > 
           <ItemTemplate> 
            <asp:DropDownList ID="options" runat="server" AutoPostBack="true"> 
             <asp:ListItem Value="1">Verified</asp:ListItem> 
             <asp:ListItem Value="0">Rejected</asp:ListItem> 
            </asp:DropDownList> 
           </ItemTemplate> 
          </asp:TemplateField> 
        </Columns> 
        <PagerSettings Visible="false"/>    
     </asp:GridView> 
<asp:DropDownList ID="PageSelect" runat="server" AutoPostBack="true" OnSelectedIndexChanged="PageSelect_SelectedIndexChanged"></asp:DropDownList> 

沒有人知道如何解決它，我應該在哪裏放的IsPostBack？謝謝

Answer 1

您需要處理OnRowDataBound並以編程方式設置適當的元素。例如：

<asp:GridView ID="unverifiedlist" runat="server" 
    OnRowDataBound="unverifiedlist_RowDataBound" AutoGenerateColumns="false" 
    AllowSorting="true" AllowPaging="true" ViewStateMode="Enabled"> 

並實行類似：

protected void unverifiedlist_RowDataBound(Object sender, GridViewRowEventArgs e) 
{ 
    if(e.Row.RowType == DataControlRowType.DataRow) 
    { 
    ((DropDownList)e.Row.FindControl("options")).SelectedValue=((CPDEmployee)e.Row.DataItem).Unverified; 

    } 
} 

假設，很顯然，你有一個屬性叫做未驗證您的業務對象。你應該使用適當的東西。這只是一個例子。

UPDATE：

由於下拉網格內是自動回發，我想補充的OnSelectedIndexChanged事件處理程序下拉網格內的列表。喜歡的東西：

<asp:DropDownList ID="options" runat="server" AutoPostBack="true" OnSelectedIndexChanged="options_SelectedIndexChanged"> 
    <asp:ListItem Value="1">Verified</asp:ListItem> 
    <asp:ListItem Value="0">Rejected</asp:ListItem> 
</asp:DropDownList> 

然後

protected void options_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    string selecteValue = ((DropDownList)sender).SelectedValue; 
    //Now persist this value in the appropriate business object 
    //this is the difficult part because you don't know for which row in the gridview 
    //you are changing this selection. You'll need to devise a way to pass an extra 
    //value (an Employee ID, I would imagine) that would allow you to grab the 
    // record from the List<CDPEmployee> and change the property to the new selection. 
}