Kepler-Release/Venus/Venus_MainPages/Views/UserView.xaml

<UserControl x:Class="Venus_MainPages.Views.UserView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Venus_MainPages.Views"
             xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
             xmlns:unity="clr-namespace:Venus_MainPages.Unity"
             xmlns:prism="http://prismlibrary.com/"
             prism:ViewModelLocator.AutoWireViewModel="True"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <Canvas>
        <DataGrid   ItemsSource="{Binding Users}" AlternationCount="2"
                    SelectionUnit="Cell"
                    FontSize="20"
                    MinHeight="200"
                    Canvas.Top="110"
                    Canvas.Left="10"
                    AutoGenerateColumns="False" HorizontalAlignment="Center"  VerticalAlignment="Top" CanUserAddRows="False">
            <DataGrid.Columns>
                <DataGridTemplateColumn Header="UserName"  Width="200" >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Name}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="Password"  Width="200" IsReadOnly="True">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Password}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="Role"  Width="200" >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox SelectedItem="{Binding Role,UpdateSourceTrigger=PropertyChanged}" unity:ItemsControlHelper.EnumValuesToItemsSource="True"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
            <DataGrid.GroupStyle>
                <GroupStyle >
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="{x:Type GroupItem}">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type GroupItem}">
                                        <Expander IsExpanded="True" Style="{StaticResource ExpanderStyle}" ExpandDirection="Down"  SnapsToDevicePixels="True" VerticalAlignment="Top">
                                            <Expander.Header>
                                                <Border BorderBrush="Gray" BorderThickness="0,0,0,1">
                                                    <StackPanel Orientation="Horizontal">
                                                        <TextBlock Text="{Binding Name}" Width="120" Foreground="Red"/>
                                                        <TextBlock Text="    Count：" Foreground="Red"/>
                                                        <TextBlock Text="{Binding ItemCount}" Foreground="Red"/>
                                                    </StackPanel>
                                                </Border>

                                            </Expander.Header>
                                            <ItemsPresenter/>
                                        </Expander>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                </GroupStyle>
            </DataGrid.GroupStyle>
            <DataGrid.RowStyle>
                <Style TargetType="{x:Type DataGridRow}">
                    <Style.Triggers>
                        <Trigger Property="ItemsControl.AlternationIndex"
                         Value="0">
                            <Setter Property="Background" Value="#EEEEEE" />
                        </Trigger>
                        <Trigger Property="ItemsControl.AlternationIndex"
                         Value="1">
                            <Setter Property="Background" Value="#DEDEDE" />
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.RowStyle>
        </DataGrid>

    </Canvas>
</UserControl>