WPF DataGrid 資料系結問題

<Window x:Class="CSTK.Library.DownLoad.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        xmlns:local="clr-namespace:CSTK.Library.DownLoad"

        mc:Ignorable="d"

        Title="下載中心" Height="542.406" Width="1016.225" WindowStartupLocation="CenterScreen" ResizeMode="NoResize" MaxHeight="532.406" MaxWidth="1000" >

    <Grid>

        <Grid Margin="10,2,0,451" Background="Transparent" Height="50">

            <TextBox  BorderBrush="Black" Name="search_Word" FontSize="14" FontFamily="微軟雅黑" Text="林" TextAlignment="Center" Width="100" Height="32" Padding="5" Margin="-50 0 0 8"/>

            <Button BorderBrush="Black"  FontSize="14" FontFamily="微軟雅黑" Name="search" Margin="0,8,325,0" RenderTransformOrigin="0.211,-7.49" Click="Button_Click" HorizontalAlignment="Right" Width="89" Height="30" VerticalAlignment="Top">搜索</Button>

        </Grid>

        <Grid>

            <DataGrid Margin="10,63,10,9" AutoGenerateColumns="True" Name="dg_Table" CanUserAddRows="False">

                <DataGrid.Columns>

                    <DataGridTextColumn Header="ID" Binding="{Binding Path=ID}" Width="*"></DataGridTextColumn>

                    <DataGridTextColumn Header="歌曲名" Binding="{Binding Path=SongName}" Width="*"></DataGridTextColumn>

                    <DataGridTextColumn Header="歌手" Binding="{Binding Path=SingerName}" Width="*"></DataGridTextColumn>

                    <DataGridTextColumn Header="專輯名" Binding="{Binding Path=AlbumName}" Width="*"></DataGridTextColumn>

                    <DataGridTemplateColumn Header="操作">

                        <DataGridTemplateColumn.CellTemplate>

                            <DataTemplate>

                                <StackPanel>

                                    <Button Content="下載"></Button>

                                </StackPanel>

                            </DataTemplate>

                            

                        </DataGridTemplateColumn.CellTemplate>

                        

                    </DataGridTemplateColumn>

                </DataGrid.Columns>

            </DataGrid>

        </Grid>



    </Grid>

</Window>

 public class SongDetail {

        public string ID { get; set; }

        public string SongName { get; set; }

        public string AlbumName { get; set; }

        public string SingerName { get; set; }

    }

 System.Threading.Thread th = new System.Threading.Thread(() =>

            {

                var rst = HttpHelper.HttpPost(url, data, HttpHelper.cookie, "application/x-www-form-urlencoded; charset=UTF-8");

                var root = JsonToEntity<Root>(rst);

                ObservableCollection<SongDetail> songItems = new ObservableCollection<SongDetail>();

                foreach (var song in root.song_list)

                {

                    string name = song.songname;

                    var arr = song.songname.Split(new string[] { "<sup" }, StringSplitOptions.None);

                    if (arr != null && arr.Length > 1) name = arr[0];

                    song.songname = name;

                    var singer = song.singer.FirstOrDefault();

                    songItems.Add(new SongDetail() {ID=song.songmid,SongName=name,AlbumName=song.albumname,SingerName=singer==null?"":singer.name });

                }

                dg_Table.Dispatcher.Invoke(delegate() {

                    dg_Table.ItemsSource = songItems;

                   // dg_Table.GridLinesVisibility = DataGridGridLinesVisibility.All;

                });

            });

            th.IsBackground = true;

            th.Start();

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