Here is a simple example.

ASPX

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Test._Default" %>

<%@ Register Assembly="DevExpress.Web.v12.2, Version=12.2.7.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web.ASPxGridView" TagPrefix="dx" %>

<%@ Register Assembly="DevExpress.Web.v12.2, Version=12.2.7.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

</head>

<body>

    <form id="form" runat="server">

        <script language="javascript" type="text/javascript">

            function OnGetSelectedFieldValues(selectedValues) {

                alert(selectedValues);

            }

        </script>

        <dx:ASPxGridView ID="grid" ClientInstanceName="grid" runat="server" DataSourceID="masterDataSource"

            KeyFieldName="ID" Width="100%">

            <Columns>

                <dx:GridViewDataColumn FieldName="Name" Caption="名称" />

            </Columns>

            <Templates>

                <DetailRow>

                    <dx:ASPxGridView ID="detailGrid" runat="server" KeyFieldName="ID"

                        Width="100%" ClientInstanceName="dgdv" OnInit="detailGrid_Init">

                        <Columns>

                            <dx:GridViewCommandColumn ShowSelectCheckbox="True">

                                <HeaderTemplate>

                                    <dx:ASPxCheckBox ID="SelectAllCheckBox" runat="server" ToolTip="Select/Unselect all rows on the page"

                                        ClientSideEvents-CheckedChanged="function(s, e) { dgdv.SelectAllRowsOnPage(s.GetChecked()); }" />

                                </HeaderTemplate>

                                <HeaderStyle HorizontalAlign="Center" />

                            </dx:GridViewCommandColumn>

                            <dx:GridViewDataColumn FieldName="Name" Caption="名称" />

                        </Columns>

                        <SettingsBehavior AllowSelectByRowClick="true" />

                    </dx:ASPxGridView>

                </DetailRow>

            </Templates>

            <SettingsDetail ShowDetailRow="true" AllowOnlyOneMasterRowExpanded="true" />

        </dx:ASPxGridView>

        <dx:ASPxButton ID="btnTest" runat="server" Text="Test">

            <ClientSideEvents Click="function(s, e){

                    dgdv.GetSelectedFieldValues('ID', OnGetSelectedFieldValues);

                    e.processOnServer = false;

                }" />

        </dx:ASPxButton>

        <asp:SqlDataSource

            ID="masterDataSource"

            runat="server"

            DataSourceMode="DataReader"

            ConnectionString="<%$ ConnectionStrings:TestConn%>"

            SelectCommand="SELECT * FROM Line"></asp:SqlDataSource>

    </form>

</body>

</html>

CS

using DevExpress.Web.ASPxEditors;

using DevExpress.Web.ASPxGridView;

using System;

using System.Collections.Generic;

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace Test

{

    public partial class _Default : System.Web.UI.Page

    {

        protected void detailGrid_Init(object sender, EventArgs e)

        {

            ASPxGridView dgrid = sender as ASPxGridView;

            if (dgrid == null) return;

            var dataFileId = (int)(sender as ASPxGridView).GetMasterRowFieldValues("ID");

            DataTable table = new DataTable();

            SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["TestConn"].ConnectionString);

            conn.Open();

            SqlCommand cmd = conn.CreateCommand();

            cmd.CommandText = string.Format("select * from Main where LineID={0}", dataFileId);

            SqlDataAdapter sda = new SqlDataAdapter(cmd);

            sda.Fill(table);

            conn.Close();

            dgrid.DataSource = table;

            dgrid.DataBind();

        }

    }

}

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