【WPF】DataGrid多表头的样式设计

需求

在使用WPF开发时，使用DataGrid列表显示数据时，有些字段可以进行分组显示，用于更好的表达它们之间存在的某种关系，因此就考虑到要对DataGrid的表头进行扩展，可以显示多行表头，让这些有关联的字段内容显示的更加明了简洁。

自定义样式

这段自定义样式可以放在MainWindow.xaml文件中，或者自己定义一个存放样式文件的xaml进行存放。
这里在模版里面使用的第一个Grid，是用于总的显示，还有右侧边竖线分割线，嵌入的Grid用于显示多表头的处理显示功能：第一行为总的信息，第二行为第一行和第三行的分割线，第三行显示的省、市和县。

<Style x:Key="CityStyle" TargetType="DataGridColumnHeader">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate>
                <Grid x:Name="Root">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition>
                        </ColumnDefinition>
                        <ColumnDefinition Width="Auto">
                        </ColumnDefinition>
                    </Grid.ColumnDefinitions>
                    <Grid
                                Grid.Column="0"
                                HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="30">
                            </RowDefinition>
                            <RowDefinition Height="Auto"></RowDefinition>
                            <RowDefinition Height="30">
                            </RowDefinition>
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="100">
                            </ColumnDefinition>
                            <ColumnDefinition Width="Auto">
                            </ColumnDefinition>
                            <ColumnDefinition Width="100">
                            </ColumnDefinition>
                            <ColumnDefinition Width="Auto">
                            </ColumnDefinition>
                            <ColumnDefinition Width="100">
                            </ColumnDefinition>
                        </Grid.ColumnDefinitions>
                        <ContentPresenter
                                    Grid.Row="0"
                                    Grid.Column="0"
                                    Grid.ColumnSpan="5"
                                    HorizontalAlignment="Center"
                                    VerticalAlignment="Center"
                                    Content="户籍信息">
                        </ContentPresenter>
                        <Rectangle
                                    Grid.Row="1"
                                    Grid.Column="0"
                                    Grid.ColumnSpan="5"
                                    VerticalAlignment="Stretch" Height="1"
                                    Fill="Black"
                                    Visibility="Visible">
                        </Rectangle>
                        <ContentPresenter
                                    Grid.Row="2"
                                    Grid.Column="0"
                                    HorizontalAlignment="Center"
                                    VerticalAlignment="Center"
                                    Content="省">
                        </ContentPresenter>
                        <Rectangle
                                    Grid.Row="2"
                                    Grid.Column="1"
                                    Width="1"
                                    VerticalAlignment="Stretch"
                                    Fill="#ccc"
                                    Visibility="Visible">
                        </Rectangle>
                        <ContentPresenter
                                    Grid.Row="2"
                                    Grid.Column="2"
                                    HorizontalAlignment="Center"
                                    VerticalAlignment="Center"
                                    Content="市">
                        </ContentPresenter>
                        <Rectangle
                                    Grid.Row="2"
                                    Grid.Column="3"
                                    Width="1"
                                    VerticalAlignment="Stretch"
                                    Fill="#ccc"
                                    Visibility="Visible">
                        </Rectangle>
                        <ContentPresenter
                                    Grid.Row="2"
                                    Grid.Column="4"
                                    HorizontalAlignment="Center"
                                    VerticalAlignment="Center"
                                    Content="县">
                        </ContentPresenter>
                    </Grid>
                    <Rectangle
                                Grid.Column="1"
                                Width="1"
                                VerticalAlignment="Stretch"
                                Fill="#ccc"
                                Visibility="Visible">
                    </Rectangle>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

窗体布局

<Grid>
    <DataGrid
            AutoGenerateColumns="False"
            CanUserAddRows="False"
            ItemsSource="{Binding UserInformations}">
        <DataGrid.Columns>
            <DataGridTextColumn Width="100" Binding="{Binding UserName}">
                <DataGridTextColumn.HeaderTemplate>
                    <DataTemplate>
                        <Grid HorizontalAlignment="Stretch" VerticalAlignment="Center">
                            <TextBlock
                                    Margin="5,0,5,0"
                                    HorizontalAlignment="Center"
                                    VerticalAlignment="Center"
                                    Text="姓名"
                                    TextAlignment="Center"
                                    TextWrapping="Wrap">
                            </TextBlock>
                        </Grid>
                    </DataTemplate>
                </DataGridTextColumn.HeaderTemplate>
                <DataGridTextColumn.ElementStyle>
                    <Style>
                        <Setter Property="TextBlock.TextAlignment" Value="Center">
                        </Setter>
                        <Setter Property="TextBlock.TextWrapping" Value="Wrap">
                        </Setter>
                        <Setter Property="TextBlock.HorizontalAlignment" Value="Center">
                        </Setter>
                        <Setter Property="TextBlock.VerticalAlignment" Value="Center">
                        </Setter>
                    </Style>
                </DataGridTextColumn.ElementStyle>
            </DataGridTextColumn>
            <DataGridTemplateColumn HeaderStyle="{StaticResource CityStyle}">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock
                                    Width="100"
                                    Margin="0"
                                    HorizontalAlignment="Center"
                                    VerticalAlignment="Center"
                                    Text="{Binding Province}"
                                    TextAlignment="Center">
                            </TextBlock>
                            <Rectangle Width="1" Fill="Black">
                            </Rectangle>
                            <TextBlock
                                    Width="100"
                                    HorizontalAlignment="Center"
                                    VerticalAlignment="Center"
                                    Text="{Binding City}"
                                    TextAlignment="Center">
                            </TextBlock>
                            <Rectangle Width="1" Fill="Black">
                            </Rectangle>
                            <TextBlock
                                    Width="100"
                                    HorizontalAlignment="Center"
                                    VerticalAlignment="Center"
                                    Text="{Binding County}"
                                    TextAlignment="Center">
                            </TextBlock>
                        </StackPanel>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
            <DataGridTextColumn
                    Width="100"
                    Binding="{Binding Motto}"
                    Header="格言">
                <DataGridTextColumn.HeaderStyle>
                    <Style>
                        <Setter Property="TextBlock.HorizontalAlignment" Value="Stretch">
                        </Setter>
                        <Setter Property="TextBlock.TextAlignment" Value="Center">
                        </Setter>
                    </Style>
                </DataGridTextColumn.HeaderStyle>
                <DataGridTextColumn.HeaderTemplate>
                    <DataTemplate>
                        <TextBlock
                                HorizontalAlignment="Center"
                                VerticalAlignment="Center"
                                Text="格言"
                                TextAlignment="Center"
                                TextWrapping="Wrap">
                        </TextBlock>
                    </DataTemplate>
                </DataGridTextColumn.HeaderTemplate>
                <DataGridTextColumn.ElementStyle>
                    <Style>
                        <Setter Property="TextBlock.TextAlignment" Value="Center">
                        </Setter>
                        <Setter Property="TextBlock.TextWrapping" Value="Wrap">
                        </Setter>
                        <Setter Property="TextBlock.HorizontalAlignment" Value="Center">
                        </Setter>
                        <Setter Property="TextBlock.VerticalAlignment" Value="Center">
                        </Setter>
                    </Style>
                </DataGridTextColumn.ElementStyle>
            </DataGridTextColumn>
        </DataGrid.Columns>
    </DataGrid>
</Grid>

在这里的窗体布局中，同时对姓名和格言的表头样式和Cell里面的样式进行了修改。其中DataGridTextColumn.HeaderTemplate包括的是头部的样式；DataGridTextColumn.ElementStyle宝开的是Cell的样式。

定义的实体类

public class UserInformation
    {
        public string UserName { get; set; }
        public string Province { get; set; }
        public string City { get; set; }
        public string County { get; set; }
        public int Age { get; set; }
        public string Motto { get; set; }

    }

ViewModel类的定义

public class MainViewModel:ViewModelBase
    {
        private string _title;

        public string Title
        {
            get { return _title; }
            set { Set(ref _title, value); }
        }

        private ObservableCollection<UserInformation> _userInformations;

        public ObservableCollection<UserInformation> UserInformations
        {
            get { return _userInformations; }
            set { Set(ref _userInformations, value); }
        }
        public MainViewModel()
        {
            Title = Guid.NewGuid().ToString();
            UserInformations = new ObservableCollection<UserInformation>(new List<UserInformation>()
            {
                new UserInformation()
                {
                    UserName = "Bob",Age = 32,Province = "山东",City = "济南",County = "天桥",Motto = "会当云绝顶，
一览众山小。"
                },
                new UserInformation()
                {
                    UserName = "Bob",Age = 32,Province = "山东",City = "济南",County = "天桥",Motto = "会当云绝顶，
一览众山小。"
                },
                new UserInformation()
                {
                    UserName = "Bob",Age = 32,Province = "山东",City = "济南",County = "天桥",Motto = "会当云绝顶，
一览众山小。"
                }
            });
        }
    }

本实例使用了.netcore 3.1版本进行的开发，但是对于.net framework同样适用。

MVVM模式是使用MVVMLightstd10，可以从nuget上面进行下载。

本示例已上传至GITHUB：https://github.com/mzy666888/MultiHeaderOfDataGridWpfApp