添加项目文件。

SamplePreSystem.UI/Views/QueryManager/SampleQueryView.xaml

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+<UserControl
+    x:Class="SamplePre.UIWpf.QueryManager.SampleQueryView"
+    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:local="clr-namespace:SamplePre.UIWpf.QueryManager"
+    xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    d:DesignHeight="450"
+    d:DesignWidth="800"
+    Background="White"
+    mc:Ignorable="d">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="50" />
+            <RowDefinition Height="*" />
+
+        </Grid.RowDefinitions>
+
+        <Grid>
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition />
+                <ColumnDefinition />
+            </Grid.ColumnDefinitions>
+
+            <StackPanel Margin="10,0" Orientation="Horizontal">
+
+                <TextBlock VerticalAlignment="Center" Text="时间：" />
+                <DatePicker
+                    Width="140"
+                    Height="40"
+                    Margin="10,0"
+                    HorizontalContentAlignment="Center"
+                    VerticalContentAlignment="Center"
+                    SelectedDate="{Binding StartDate}" />
+                <TextBlock VerticalAlignment="Center" Text="—" />
+                <DatePicker
+                    Width="140"
+                    Height="40"
+                    Margin="10,0"
+                    HorizontalContentAlignment="Center"
+                    VerticalContentAlignment="Center"
+                    SelectedDate="{Binding EndDate}" />
+
+            </StackPanel>
+
+            <StackPanel
+                Grid.Column="1"
+                Margin="20,0"
+                HorizontalAlignment="Right"
+                VerticalAlignment="Center"
+                Orientation="Horizontal">
+                <Button
+                    x:Name="btnFindSample"
+                    Width="100"
+                    Height="30"
+                    Margin="3"
+                    Command="{Binding GetDataCommand}"
+                    Content="查 询" />
+                <Button
+                    x:Name="btnExport"
+                    Width="100"
+                    Height="30"
+                    Margin="3"
+                    Command="{Binding ExportExcelCommand}"
+                    Content="导 出" />
+            </StackPanel>
+
+
+        </Grid>
+
+
+
+        <Border
+            Grid.Row="1"
+            Margin="5"
+            BorderBrush="LightGray"
+            BorderThickness="1">
+            <Grid>
+                <Grid.RowDefinitions>
+                    <RowDefinition Height="30" />
+                    <RowDefinition Height="*" />
+                </Grid.RowDefinitions>
+                <StackPanel
+                    Grid.Row="0"
+                    Height="30"
+                    VerticalAlignment="Center"
+                    Background="#E6E6E6">
+                    <TextBlock
+                        Margin="10,0"
+                        Padding="6"
+                        HorizontalAlignment="Left"
+                        VerticalAlignment="Center"
+                        Text="样品列表" />
+                </StackPanel>
+
+                <DataGrid
+                    x:Name="dg_sample"
+                    Grid.Row="1"
+                    AutoGenerateColumns="False"
+                    Background="White"
+                    CanUserAddRows="False"
+                    CanUserSortColumns="True"
+                    FrozenColumnCount="1"
+                    HorizontalScrollBarVisibility="Auto"
+                    IsReadOnly="True"
+                    ItemsSource="{Binding SampleList}"
+                    SelectedItem="{Binding SelectSample}"
+                    SelectionMode="Extended"
+                    VerticalScrollBarVisibility="Auto">
+                    <DataGrid.Columns>
+                        <DataGridTextColumn
+                            Width="*"
+                            Binding="{Binding qrcode}"
+                            Header="二维码" />
+                        <DataGridTextColumn
+                            Width="*"
+                            Binding="{Binding item_name}"
+                            Header="样品名称" />
+                        <DataGridTextColumn
+                            Width="*"
+                            Binding="{Binding standrad_id}"
+                            Header="标准ID" />
+                        <DataGridTextColumn
+                            Width="*"
+                            Binding="{Binding standrad}"
+                            Header="标准名称" />
+                        <DataGridTextColumn
+                            Width="*"
+                            Binding="{Binding input_user}"
+                            Header="录入人员" />
+                        <DataGridTextColumn
+                            Width="*"
+                            Binding="{Binding input_date}"
+                            Header="录入日期" />
+                        <DataGridTextColumn
+                            Width="*"
+                            Binding="{Binding bach_no}"
+                            Header="批号" />
+
+                    </DataGrid.Columns>
+                </DataGrid>
+            </Grid>
+        </Border>
+
+
+    </Grid>
+</UserControl>

SamplePreSystem.UI/Views/QueryManager/SampleQueryView.xaml.cs

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+using SamplePreSystem.UI.ViewModel.QueryManager;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace SamplePre.UIWpf.QueryManager
+{
+    /// <summary>
+    /// SampleQueryView.xaml 的交互逻辑
+    /// </summary>
+    public partial class SampleQueryView : UserControl
+    {
+        public SampleQueryView()
+        {
+            InitializeComponent();
+
+            this.DataContext = new SampleQueryViewModel();
+        }
+
+    
+
+    }
+}