页面代码：
<Window x:Class="WpfSnqkGasAnalysis.WindowGasExportA2"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:WpfSnqkGasAnalysis"mc:Ignorable="d"WindowStartupLocation="CenterScreen"FontSize="16"Title="导出A2，自定义导出设置列" Height="744" Width="800"><Window.Resources><Style TargetType="Button" x:Key="sel_button"><Setter Property="Margin" Value="13,2"></Setter><Setter Property="Padding" Value="10,2"></Setter><Setter Property="FontSize" Value="16"></Setter><Setter Property="HorizontalContentAlignment" Value="Left"></Setter></Style><Style TargetType="Border" x:Key="boder_order"><Setter Property="MinWidth" Value="233"></Setter><!--<Setter Property="BorderBrush" Value="Lime"></Setter><Setter Property="BorderThickness" Value="2"></Setter>--><Setter Property="Margin" Value="20,2"></Setter><Style.Resources><Style TargetType="Label"><Setter Property="FontSize" Value="16"></Setter></Style><Style TargetType="TextBox"><Setter Property="FontSize" Value="16"></Setter></Style></Style.Resources></Style></Window.Resources><Grid><Grid.RowDefinitions><RowDefinition Height="70"></RowDefinition><RowDefinition Height="*"></RowDefinition></Grid.RowDefinitions><Grid Grid.Row="0" ><Border BorderBrush="Gold" BorderThickness="0,0,0,1" ><Grid><Label HorizontalAlignment="Left" Margin="0,0,0,0" VerticalAlignment="Top">注意：请先点击左侧需要导出的字段，以作为导出列</Label><TextBlock HorizontalAlignment="Left" Margin="70,44,0,0" TextWrapping="Wrap" FontWeight="Bold" Text="勾选导出列" VerticalAlignment="Top" RenderTransformOrigin="0.952,0.48"/><TextBlock HorizontalAlignment="Left" Margin="376,44,0,0" TextWrapping="Wrap" FontWeight="Bold" Text="已勾选的导出列" VerticalAlignment="Top"/></Grid></Border></Grid><Grid Grid.Row="1"><Grid ShowGridLines="True" ><Grid.ColumnDefinitions><ColumnDefinition Width="284" ></ColumnDefinition><ColumnDefinition Width="*" ></ColumnDefinition></Grid.ColumnDefinitions><ScrollViewer Grid.Column="0" VerticalScrollBarVisibility="Auto" ><StackPanel x:Name="leftFields" Orientation="Vertical" Background="#FFFFFF" ><Button Content="样品编号" Tag="k338_sample_no" Style="{StaticResource sel_button}" /><Button Content="井号" Tag="k338_well_no" Style="{StaticResource sel_button}" /><Button Content="类别" Tag="k338_cate" Style="
