Asp.net WebForm ListView如何使用 ping狀態去排序?

asp.net c# @asp.net webform c#

Star 2023-02-02 10:02:53 ‧ 995 瀏覽

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小弟想將SQL所存好的IP去分別Ping一次，
那麼沒ping通的設備就排序在ListView的最上層，
但好像都沒辦法這樣排序。
小弟已經有事先與ChatGPT所提供的資訊參考方向去修改
但後續ChatGPT也說code沒問題(當然我知道這方式是參考用)
所以想詢問大大有無這方面的解決方式。

c#
namespace TestWeb1
{
    public partial class WebForm1 : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                ListView1.DataSource = GetData();
                ListView1.DataBind();
            }
        }

        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[0];


                    //參考官方Ping方式
                    Ping ping = new Ping();
                    string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
                    byte[] buffer = Encoding.ASCII.GetBytes(data);
                    PingOptions options = new PingOptions(64, true);

                    // Wait 1 seconds for a reply.
                    int timeout = 1000;

                    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", "red");
                    }
                    else
                    {
                        SortDirection direction = SortDirection.Ascending;

                        pingitems = direction == SortDirection.Ascending ? pingitems : "";

                        lab.Attributes.Add("class", "mediumseagreen");
                    }

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

        }

        protected void Timer1_Tick(object sender, EventArgs e)
        {
            Lable1.Text = "主機時間：" +DateTime.Now.ToString();
        }

        protected void ListView1_Sorting(object sender, ListViewSortEventArgs e)
        {
            
            // Get the sort expression and sort direction from the event args
            string sortExpression = e.SortExpression;
            SortDirection sortDirection = e.SortDirection;

            DataTable data = GetData();
            data.DefaultView.Sort = sortExpression + " " + (sortDirection == SortDirection.Ascending ? "ASC" : "DESC");
            ListView1.DataSource = data;
            ListView1.DataBind();
        }
        private DataTable GetData()
        {
            DataTable dt = new DataTable();
            using (SqlConnection con = new SqlConnection("Data Source=LAPTOP-8RO7LF5C;Initial Catalog=edtweb;Integrated Security=True"))
            {
                using (SqlCommand cmd = new SqlCommand("SELECT ip,name FROM edtdata", con))
                {
                    con.Open();
                    SqlDataAdapter da = new SqlDataAdapter(cmd);
                    da.Fill(dt);

                    //排序
                    dt.DefaultView.Sort = "ip DESC";
                    dt = dt.DefaultView.ToTable();
                }
            }
            return dt;
        }

    }
}

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:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
        <ContentTemplate>
            <!-- 設定時間更新1秒 -->
             <asp:Timer id="Timer1" runat="server" Interval="1000" OnTick="Timer1_Tick" />
            <asp:ScriptManager ID="ScriptManager1" runat="server" />
            <asp:Label ID="Lable1" runat="server" />

            <asp:ListView ID="ListView1" runat="server" GroupItemCount="3" OnSorting="ListView1_Sorting" 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="200">
                                    <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>
            <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:edtwebConnectionString %>" SelectCommand="SELECT [name], [ip] FROM [edtdata] ORDER BY [name]"/>
        </ContentTemplate>
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="ListView1" />
        </Triggers>
    </asp:UpdatePanel>
</asp:Content>

自己在debug時，發現都是只會跑到ItemDataBound事件而已，
並不會跑到sorting事件裡去排序，所以想請教大大小弟是需要修正哪邊的呢?

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㊣浩瀚星空㊣ iT邦大神 1 級 ‧ 2023-02-02 11:13:45 檢舉

其實....我光看到用 ChatGPT 給的代碼來改。
我是真的有點嚇到就是了。

Star iT邦新手 5 級 ‧ 2023-02-02 11:55:37 檢舉

現在它也是一種熱門輔助工具不是嗎?

harry731 iT邦新手 2 級 ‧ 2023-02-10 12:17:21 檢舉

方便把目前跑出來的原始頁面提供一下嗎?
個人猜測目前跑出來的結果應該是按照IP降序排列出來的吧?

Star iT邦新手 5 級 ‧ 2023-02-13 11:03:31 檢舉

harry大他是連排序sorting事件都沒進入到此事件做排序，他目前也沒以IP排序

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1 個回答

JamesDoge

iT邦高手 1 級 ‧ 2023-02-15 06:14:05

最佳解答

你可以在 GetData 方法中新增一個欄位用來存放 ping 狀態，並且在排序時以該欄位排序，這樣就可以達到按照 ping 狀態排序的目的了。下面是修改後的範例程式碼：

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ListView1.DataSource = GetData();
        ListView1.DataBind();
    }
}

private DataTable GetData()
{
    DataTable dt = new DataTable();
    using (SqlConnection con = new SqlConnection("Data Source=LAPTOP-8RO7LF5C;Initial Catalog=edtweb;Integrated Security=True"))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT ip,name FROM edtdata", con))
        {
            con.Open();
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(dt);

            // 新增一個欄位來存放 ping 狀態
            dt.Columns.Add("PingStatus", typeof(bool));

            foreach (DataRow row in dt.Rows)
            {
                var pingitems = (string)row["ip"];

                // 參考官方 Ping 方式
                Ping ping = new Ping();
                string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
                byte[] buffer = Encoding.ASCII.GetBytes(data);
                PingOptions options = new PingOptions(64, true);

                // Wait 1 seconds for a reply.
                int timeout = 1000;

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

                // 將 ping 結果存到 DataTable
                row["PingStatus"] = pingReply.Status == IPStatus.Success;
            }

            // 以 ping 狀態排序
            dt.DefaultView.Sort = "PingStatus ASC, ip DESC";
            dt = dt.DefaultView.ToTable();
        }
    }
    return dt;
}

protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (e.Item.ItemType == ListViewItemType.DataItem)
    {
        System.Data.DataRowView DRV = (System.Data.DataRowView)e.Item.DataItem;
        var pingStatus = (bool)DRV.Row["PingStatus"];
        var lab = e.Item.FindControl("color") as HtmlControl;

        if (!pingStatus)
        {
            lab.Attributes.Add("class", "red");
        }
        else
        {
            lab.Attributes.Add("class", "mediumseagreen");
        }
    }
}

這樣就可以在 GetData 方法中先用 Ping 將狀態儲存到 DataTable 中，然後再以該欄位排序。在 ListView1_ItemDataBound 事件中，你可以取得該列資料的 ping 狀態並且依據狀態變更該列的背景顏色。

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Star iT邦新手 5 級 ‧ 2023-02-17 17:20:27 檢舉

感謝J大再次回覆協助小弟~
小弟再試試看~ 感謝~

Star iT邦新手 5 級 ‧ 2023-02-20 17:55:12 檢舉

請教一下J大，我後來使用您的方式去用會造成載入網頁很久，下追蹤有發現在 foreach跑多筆ip資料。
小弟後來也使用async方式去非同步，但一直也會載入很久跑不出來，請教一下J大可給個方向或參考的嗎?
都主要在 foreach迴圈裡跑多筆資料遲遲不出來，資料筆數約有2000筆

JamesDoge iT邦高手 1 級 ‧ 2023-02-22 20:02:11 檢舉

這個程式中，問題可能在於 ping 要在 foreach 迴圈內運行 2000 次，這會造成每次網頁載入時都需要執行 2000 次的 ping，這可能會花費很長的時間。

JamesDoge iT邦高手 1 級 ‧ 2023-02-22 20:03:26 檢舉

可以使用多執行緒來讓 Ping 執行於不同的執行緒，以下是修改後的程式碼範例：

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ListView1.DataSource = GetData();
        ListView1.DataBind();
    }
}

private DataTable GetData()
{
    DataTable dt = new DataTable();
    using (SqlConnection con = new SqlConnection("Data Source=LAPTOP-8RO7LF5C;Initial Catalog=edtweb;Integrated Security=True"))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT ip,name FROM edtdata", con))
        {
            con.Open();
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(dt);

            // 新增一個欄位來存放 ping 狀態
            dt.Columns.Add("PingStatus", typeof(bool));
            List<Task> pingTasks = new List<Task>();
            foreach (DataRow row in dt.Rows)
            {
                pingTasks.Add(Task.Run(() =>
                {
                    var pingitems = (string)row["ip"];

                    // 參考官方 Ping 方式
                    Ping ping = new Ping();
                    string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
                    byte[] buffer = Encoding.ASCII.GetBytes(data);
                    PingOptions options = new PingOptions(64, true);

                    // Wait 1 seconds for a reply.
                    int timeout = 1000;

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

                    // 將 ping 結果存到 DataTable
                    row["PingStatus"] = pingReply.Status == IPStatus.Success;
                }));
            }
            Task.WaitAll(pingTasks.ToArray());
            // 以 ping 狀態排序
            dt.DefaultView.Sort = "PingStatus ASC, ip DESC";
            dt = dt.DefaultView.ToTable();
        }
    }
    return dt;
}

protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (e.Item.ItemType == ListViewItemType.DataItem)
    {
        System.Data.DataRowView DRV = (System.Data.DataRowView)e.Item.DataItem;
        var pingStatus = (bool)DRV.Row["PingStatus"];
        var lab = e.Item.FindControl("color") as HtmlControl;

        if (!pingStatus)
        {
            lab.Attributes.Add("class", "red");
        }
        else
        {
            lab.Attributes.Add("class", "mediumseagreen");
        }
    }
}

可以使用多執行緒來讓 Ping 執行於不同的執行緒，以下是修改後的程式碼範例：
```
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ListView1.DataSource = GetData();
        ListView1.DataBind();
    }
}

private DataTable GetData()
{
    DataTable dt = new DataTable();
    using (SqlConnection con = new SqlConnection("Data Source=LAPTOP-8RO7LF5C;Initial Catalog=edtweb;Integrated Security=True"))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT ip,name FROM edtdata", con))
        {
            con.Open();
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(dt);

// 新增一個欄位來存放 ping 狀態
            dt.Columns.Add("PingStatus", typeof(bool));
            List<Task> pingTasks = new List<Task>();
            foreach (DataRow row in dt.Rows)
            {
                pingTasks.Add(Task.Run(() =>
                {
                    var pingitems = (string)row["ip"];

// 參考官方 Ping 方式
                    Ping ping = new Ping();
                    string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
                    byte[] buffer = Encoding.ASCII.GetBytes(data);
                    PingOptions options = new PingOptions(64, true);

// Wait 1 seconds for a reply.
                    int timeout = 1000;

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

// 將 ping 結果存到 DataTable
                    row["PingStatus"] = pingReply.Status == IPStatus.Success;
                }));
            }
            Task.WaitAll(pingTasks.ToArray());
            // 以 ping 狀態排序
            dt.DefaultView.Sort = "PingStatus ASC, ip DESC";
            dt = dt.DefaultView.ToTable();
        }
    }
    return dt;
}

protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (e.Item.ItemType == ListViewItemType.DataItem)
    {
        System.Data.DataRowView DRV = (System.Data.DataRowView)e.Item.DataItem;
        var pingStatus = (bool)DRV.Row["PingStatus"];
        var lab = e.Item.FindControl("color") as HtmlControl;

if (!pingStatus)
        {
            lab.Attributes.Add("class", "red");
        }
        else
        {
            lab.Attributes.Add("class", "mediumseagreen");
        }
    }
}

```

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