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Asp.net WebForm ListView使用ItemDataBound事件，載入網頁很慢

asp.net c# @asp.net webform webform c#
Star 2022-12-23 11:19:33 ‧ 1033 瀏覽

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如題。
小弟使用ListView的ItemDataBound後，因載入多筆(200筆)ping資料
造成光載入網頁後須等待約15秒才載入到網頁。
後續也使用Async非同步方式也沒辦法加快載入。
請問有相關優化的寫法可參考嗎?code如下

c#
public partial class WebForm1 : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {
           
        }

        protected  async void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
        {
            try
            {
                if (e.Item.ItemType == ListViewItemType.DataItem)
                {
                   System.Data.DataRowView DRV =(System.Data.DataRowView)e.Item.DataItem;

                    var pingitems = (string)DRV.Row.ItemArray[1];
                    
                    Ping ping = new Ping();
                
                    string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
                    byte[] buffer = Encoding.ASCII.GetBytes(data);
                    PingOptions options = new PingOptions(64, true);
                    // Wait 12 seconds for a reply.
                    int timeout = 12000;

                    PingReply pingReply = await ping.SendPingAsync(pingitems, timeout, buffer, options);

                    
                    var lab = e.Item.FindControl("color") as HtmlControl;//找到html定義顏色群組

                    if (pingReply.Status == IPStatus.Success)
                    {
                        lab.Attributes.Add("class", "mediumseagreen");
                    }
                    else
                    {
                        lab.Attributes.Add("class", "red");
                    }
                
                }

            }
            catch (Exception ex)
            {
                Response.Write("<script language='javascript'>alert(\"" + "錯誤訊息 : " + ex.Message.Replace("\r\n", "") + "\");</script>");
            }

        }


    }

aspx
<%@ Page Async="true" Title="" Language="C#" MasterPageFile="~/MasterPage.Master" AutoEventWireup="true" CodeBehind="MonitorStatus.aspx.cs" Inherits="TestWeb1.WebForm1" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1" GroupItemCount="3" OnItemDataBound="ListView1_ItemDataBound">
        <AlternatingItemTemplate>
            <td runat="server" style="" id="color">
                <style type="text/css">
                    .red {
                        background-color: red;
                    }

                    .mediumseagreen {
                        background-color: mediumseagreen;
                    }
                </style>
                name:
                <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
                <br />
                ip:
                <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
                <br />
            </td>
        </AlternatingItemTemplate>
        <EditItemTemplate>
            <td runat="server" style="">
                name:
                <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' />
                <br />
                ip:
                <asp:TextBox ID="ipTextBox" runat="server" Text='<%# Bind("ip") %>' />
                <br />
                <asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="更新" />
                <br />
                <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="取消" />
                <br />
            </td>
        </EditItemTemplate>
        <EmptyDataTemplate>
            <table runat="server" style="">
                <tr>
                    <td>未傳回資料。</td>
                </tr>
            </table>
        </EmptyDataTemplate>
        <EmptyItemTemplate>
            <td runat="server" />
        </EmptyItemTemplate>
        <GroupTemplate>
            <tr id="itemPlaceholderContainer" runat="server">
                <td id="itemPlaceholder" runat="server"></td>
            </tr>
        </GroupTemplate>
        <InsertItemTemplate>
            <td runat="server" style="">
                name:
                <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' />
                <br />
                ip:
                <asp:TextBox ID="ipTextBox" runat="server" Text='<%# Bind("ip") %>' />
                <br />
                <asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="插入" />
                <br />
                <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="清除" />
                <br />
            </td>
        </InsertItemTemplate>
        <ItemTemplate>
            <td id ="color" runat="server" style="" >
                <style type="text/css">
                    .red {
                        background-color: red;
                    }

                    .mediumseagreen {
                        background-color: mediumseagreen;
                    }
                </style>
                name:
                <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
                <br />
                ip:
                <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
                <br />
            </td>
        </ItemTemplate>
        <LayoutTemplate>
            <table runat="server">
                <tr runat="server">
                    <td runat="server">
                        <table id="groupPlaceholderContainer" runat="server" border="0" style="">
                            <tr id="groupPlaceholder" runat="server">
                            </tr>
                        </table>
                    </td>
                </tr>
                <tr runat="server">
                    <td runat="server" style="">
                    </td>
                </tr>
            </table>
        </LayoutTemplate>
        <SelectedItemTemplate>
            <td runat="server" style="">
                name:
                <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
                <br />
                ip:
                <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
                <br />
            </td>
        </SelectedItemTemplate>
    </asp:ListView>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:edtwebConnectionString %>" SelectCommand="SELECT [name], [ip] FROM [edtdata] ORDER BY [name]"></asp:SqlDataSource>
    <br />
</asp:Content>

後續更新，
自己後來持續排查原因。
原來是自己將timeout設定12秒導致先前就要等很久的情況。
感謝下面回覆的大大協助，讓我增加優化的方式~~

alien663 iT邦研究生 5 級 ‧ 2022-12-23 16:33:38 檢舉
就你這狀況，我覺得最好的優化就是換個前端框架，御三家都挺香的。
如果堅持要用asp，那可以考慮作後端分頁，減少一次性load大量資料進來的狀況。
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1 個回答

1
JamesDoge
iT邦高手 1 級 ‧ 2022-12-24 02:34:21

後端分頁的作法：
你可以使用 Asp.Net 內建的分頁控制項 DataPager，就可以在網頁中使用分頁功能以提升載入速度。

  1. 在 ListView 的元素中新增的 PagedControlID 屬性：
<asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1" PagedControlID="DataPager1" GroupItemCount="3" OnItemDataBound="ListView1_ItemDataBound">
  1. 加在 ListView 元素的 LayoutTemplate 模板中
<asp:DataPager ID="DataPager1" runat="server" PageSize="20">
<Fields>
<asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True" ShowNextPageButton="False" ShowPreviousPageButton="False" />
<asp:NumericPagerField />
<asp:NextPreviousPagerField ButtonType="Button" ShowLastPageButton="True" ShowNextPageButton="False" ShowPreviousPageButton="False" />
</Fields>
</asp:DataPager>

修改後的ASPX：

<%@ Page Async="true" Title="" Language="C#" MasterPageFile="~/MasterPage.Master" AutoEventWireup="true" CodeBehind="MonitorStatus.aspx.cs" Inherits="TestWeb1.WebForm1" %>

            <asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
            </asp:Content>
            <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
            <asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1" PagedControlID="DataPager1" GroupItemCount="3" OnItemDataBound="ListView1_ItemDataBound">
            <AlternatingItemTemplate>
            <td runat="server" style="" id="color">
            <style type="text/css">
            .red {
            background-color: red;
            }
                .mediumseagreen {
                    background-color: mediumseagreen;
                }
            </style>
            name:
            <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
            <br />
            ip:
            <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
            <br />
            </td>
            </AlternatingItemTemplate>
            <EditItemTemplate>
            <td runat="server" style="">
            name:
            <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' />
            <br />
            ip:
            <asp:TextBox ID="ipTextBox" runat="server" Text='<%# Bind("ip") %>' />
            <br />
            </td>
            </EditItemTemplate>
            <EmptyDataTemplate>
            <table runat="server" style="" id="color">
            <tr>
            <td>No data was returned.</td>
            </tr>
            </table>
            </EmptyDataTemplate>
            <InsertItemTemplate>
            <td runat="server" style="">
            name:
            <asp:TextBox ID="nameTextBox" runat="server" Text="" />
            <br />
            ip:
            <asp:TextBox ID="ipTextBox" runat="server" Text="" />
            <br />
            </td>
            </InsertItemTemplate>
            <ItemTemplate>
            <td runat="server" style="" id="color">
            <style type="text/css">
            .red {
            background-color: red;
            }
                .mediumseagreen {
                    background-color: mediumseagreen;
                }
            </style>
            name:
            <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
            <br />
            ip:
            <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
            <br />
        </td>
    </ItemTemplate>
    <LayoutTemplate>
        <table runat="server">
            <tr runat="server" style="">
                <td runat="server" style="" id="color">
                    <style type="text/css">
                        .red {
                            background-color: red;
                        }

                        .mediumseagreen {
                            background-color: mediumseagreen;
                        }
                    </style>
                    <table ID="itemPlaceholderContainer" runat="server" border="0" style="">
                        <tr runat="server" style="">
                            <th runat="server" style="">name</th>
                            <th runat="server" style="">ip</th>
                        </tr>
                        <tr ID="itemPlaceholder" runat="server">
                        </tr>
                    </table>
                </td>
            </tr>
            <tr runat="server">
                <td runat="server" style="text-align: center;">
                    <asp:DataPager ID="DataPager1" runat="server" PageSize="20">
                        <Fields>
                            <asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True" ShowNextPage Button="False" ShowPreviousPageButton="False" />
            <asp:NumericPagerField />
            <asp:NextPreviousPagerField ButtonType="Button" ShowLastPageButton="True" ShowNextPageButton="False" ShowPreviousPageButton="False" />
            </Fields>
            </asp:DataPager>
            </td>
            </tr>
            </table>
            </LayoutTemplate>
            <SelectedItemTemplate>
            <td runat="server" style="">
            name:
            <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
            <br />
            ip:
            <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
            <br />
            </td>
            </SelectedItemTemplate>
            </asp:ListView>
            <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" SelectCommand="SELECT [name], [ip] FROM [table1]"></asp:SqlDataSource>
</asp:Content>

補充：

參考網路上的教學 https://songshizhao.com/blog/blogPage/116.html

使用ASP.NET的ajax控件實現分頁局部刷新頁面：

1.引入ajax控件ScriptManager，放在form裡。

<asp:ScriptManager runat="server"></asp:ScriptManager>

2.引入ajax控件UpdatePanel。

<asp:UpdatePanel runat="server">
</asp:UpdatePanel>

3.編輯UpdatePanel內容。
在 UpdatePanel 標籤中加入要進行局部刷新的控制項，例如 ListView 控制項：

<asp:UpdatePanel runat="server">
  <ContentTemplate>
    <asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1" GroupItemCount="3" OnItemDataBound="ListView1_ItemDataBound">
      <!-- 省略其他模板 -->
    </asp:ListView>
  </ContentTemplate>
</

修改後的ASPX：

<%@ Page Async="true" Title="" Language="C#" MasterPageFile="~/MasterPage.Master" AutoEventWireup="true" CodeBehind="MonitorStatus.aspx.cs" Inherits="TestWeb1.WebForm1" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
  <contenttemplate>
    <asp:ScriptManager runat="server"></asp:ScriptManager>
    <asp:UpdatePanel runat="server">
      <ContentTemplate>
        <asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1" GroupItemCount="3" OnItemDataBound="ListView1_ItemDataBound">
          <AlternatingItemTemplate>
            <td runat="server" style="" id="color">
              <style type="text/css">
                .red {
                  background-color: red;
                }

                .mediumseagreen {
                  background-color: mediumseagreen;
                }
              </style>
              name:
              <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
              <br />
              ip:
              <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
              <br />
            </td>
          </AlternatingItemTemplate>
          <EditItemTemplate>
            <td runat="server" style="">name:
              <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' />
              <br />
              ip:
              <asp:TextBox ID="ipTextBox" runat="server" Text='<%# Bind("ip") %>' />
              <br />
              <asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="更新" />
              <br />
              <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="取消" />
              <br />
            </td>
          </EditItemTemplate>
          <EmptyDataTemplate>
            <table runat="server" style="">
              <tr>
                <td>未傳回資料。</td>
                </tr>
                </table>
                </EmptyDataTemplate>
                <EmptyItemTemplate>
                  <td runat="server" />
                </EmptyItemTemplate>
                <GroupTemplate>
                  <tr id="itemPlaceholderContainer" runat="server">
                    <td id="itemPlaceholder" runat="server"></td>
                  </tr>
                </GroupTemplate>
                <InsertItemTemplate>
                  <td runat="server" style="">name:
                    <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' />
                    <br />
                    ip:
                    
                <asp:TextBox ID="ipTextBox" runat="server" Text='<%# Bind("ip") %>' />
                    <br />
                    <asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="插入" />
                    <br />
                    <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="清除" />
                    <br />
                  </td>
                </InsertItemTemplate>
                <ItemTemplate>
                  <td runat="server" style="" id="color">
                    <style type="text/css">
                      .red {
                        background-color: red;
                      }

                      .mediumseagreen {
                        background-color: mediumseagreen;
                      }
                    </style>
                    name:
                    <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
                    <br />
                    ip:
                    <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
                    <br />
                  </td>
                </ItemTemplate>
                <LayoutTemplate>
                  <table runat="server">
                    <tr runat="server">
                      <td runat="server">
                        <table id="groupPlaceholderContainer" runat="server">
          <tr id="groupPlaceholder" runat="server"></tr>
        </table>
      </td>
    </tr>
    <tr runat="server">
      <td runat="server">
        <asp:DataPager ID="DataPager1" runat="server" PagedControlID="ListView1">
          <Fields>
            <asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True" ShowNextPageButton="False"
              ShowPreviousPageButton="False" />
            <asp:NumericPagerField />
            <asp:NextPreviousPagerField ButtonType="Button" ShowLastPageButton="True" ShowNextPageButton="False"
              ShowPreviousPageButton="False" />
          </Fields>
        </asp:DataPager>
      </td>
    </tr>
  </table>
</LayoutTemplate>
<SelectedItemTemplate>
  <td runat="server" style="">name:
    <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
    <br />
    ip:
    <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
    <br />
  </td>
</SelectedItemTemplate>
</asp:ListView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
  SelectCommand="SELECT [name], [ip] FROM [table1]">
</asp:SqlDataSource>
</ContentTemplate>
</asp:UpdatePanel>
</contenttemplate>
</asp:Content>

僅供參考

看更多先前的回應...收起先前的回應...
Star iT邦新手 5 級 ‧ 2022-12-24 10:16:03 檢舉

有使用分頁方式嘗試，但一次載入100筆的話就也是變慢
，後續User說想要一次性顯示的話該怎麼辦?
我只想到做法是說，
先將網頁載入時並每個資料都不先做ping動作，只顯示資料
，載入完成後顯示後才執行ping動作。
請問大大這想法可以嗎?

JamesDoge iT邦高手 1 級 ‧ 2022-12-24 10:24:24 檢舉

可以在 DataPager 中使用 AsyncPostBackTrigger 控制項
可參考網路上的教學 https://songshizhao.com/blog/blogPage/116.html

Star iT邦新手 5 級 ‧ 2022-12-24 11:31:29 檢舉

好的 感謝J大給的方向，我在研究一下您所提供的，感謝~!/images/emoticon/emoticon41.gif

Star iT邦新手 5 級 ‧ 2022-12-25 11:45:37 檢舉

不好意思J大，我使用這方法之後，都還是會先執行ItemDataBound事件，感覺好像沒什麼效果
是我做錯哪部分嗎?

<%@ Page Async="true" Title="" Language="C#" MasterPageFile="~/MasterPage.Master" AutoEventWireup="true" CodeBehind="MonitorStatus.aspx.cs" Inherits="TestWeb1.WebForm1" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <contenttemplate>
        <asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1" GroupItemCount="3" OnItemDataBound="ListView1_ItemDataBound">
            <AlternatingItemTemplate>
                <td runat="server" style="" id="color">
                    <style type="text/css">
                        .red {
                            background-color: red;
                        }

                        .mediumseagreen {
                            background-color: mediumseagreen;
                        }
                    </style>
                    name:
                <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
                    <br />
                    ip:
                <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
                    <br />
                </td>
            </AlternatingItemTemplate>
            <EditItemTemplate>
                <td runat="server" style="">name:
                <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' />
                    <br />
                    ip:
                <asp:TextBox ID="ipTextBox" runat="server" Text='<%# Bind("ip") %>' />
                    <br />
                    <asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="更新" />
                    <br />
                    <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="取消" />
                    <br />
                </td>
            </EditItemTemplate>
            <EmptyDataTemplate>
                <table runat="server" style="">
                    <tr>
                        <td>未傳回資料。</td>
                    </tr>
                </table>
            </EmptyDataTemplate>
            <EmptyItemTemplate>
                <td runat="server" />
            </EmptyItemTemplate>
            <GroupTemplate>
                <tr id="itemPlaceholderContainer" runat="server">
                    <td id="itemPlaceholder" runat="server"></td>
                </tr>
            </GroupTemplate>
            <InsertItemTemplate>
                <td runat="server" style="">name:
                <asp:TextBox ID="nameTextBox" runat="server" Text='<%# Bind("name") %>' />
                    <br />
                    ip:
                <asp:TextBox ID="ipTextBox" runat="server" Text='<%# Bind("ip") %>' />
                    <br />
                    <asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="插入" />
                    <br />
                    <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="清除" />
                    <br />
                </td>
            </InsertItemTemplate>
            <ItemTemplate>
                <td runat="server" style="" id="color">
                    <style type="text/css">
                        .red {
                            background-color: red;
                        }

                        .mediumseagreen {
                            background-color: mediumseagreen;
                        }
                    </style>
                    name:
                <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
                    <br />
                    ip:
                <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
                    <br />
                </td>
            </ItemTemplate>
            <LayoutTemplate>
                <table runat="server">
                    <tr runat="server">
                        <td runat="server">
                            <table id="groupPlaceholderContainer" runat="server" border="0" style="">
                                <tr id="groupPlaceholder" runat="server">
                                </tr>
                            </table>
                        </td>
                    </tr>
                    <tr runat="server">
                        <td runat="server" style="">
                            <asp:DataPager ID="DataPager1" runat="server" PageSize="80">
                                <Fields>
                                    <asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True" ShowLastPageButton="True" />
                                </Fields>
                            </asp:DataPager>
                        </td>
                    </tr>
                </table>
            </LayoutTemplate>
            <SelectedItemTemplate>
                <td runat="server" style="">name:
                <asp:Label ID="nameLabel" runat="server" Text='<%# Eval("name") %>' />
                    <br />
                    ip:
                <asp:Label ID="ipLabel" runat="server" Text='<%# Eval("ip") %>' />
                    <br />
                </td>
            </SelectedItemTemplate>
        </asp:ListView>

    </contenttemplate>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="ListView1" />
        </Triggers>
    </asp:UpdatePanel>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:edtwebConnectionString %>" SelectCommand="SELECT [name], [ip] FROM [edtdata] ORDER BY [name]"></asp:SqlDataSource>
    <br />
</asp:Content>
JamesDoge iT邦高手 1 級 ‧ 2022-12-25 13:20:38 檢舉

我看一下之前貼給你的網路教學 你還要補AJAX，他有用到ScriptManager，我補充了 請參考看看

Star iT邦新手 5 級 ‧ 2022-12-25 16:22:38 檢舉

這部分已在發問前有在主頁(master)補上ScriptManager，因為我碰到這錯誤我就有檢查過了。
還是說要放在分頁這邊才有效果呢?

我會在參考一下您的補充試試看 感謝~

Star iT邦新手 5 級 ‧ 2022-12-25 16:59:20 檢舉

剛剛後來檢查code了一遍，結果是我timeout設成12秒所導致先前就要等蠻久的情況/images/emoticon/emoticon04.gif
不過很謝謝J大的指導~

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