在网上搜索wpf合并单元格，一直没搜索到，没办法，只能自己想办法搞定了。其实就是DataGrid套DataGrid，为了方便支持Column拖动，在合并的DataGridColumn那一列的Header也放一个DataGrid，但是合并的这一个连续列中只支持一列的拖动，效果如下，上图

代码如下

首先定义两个模板，一个用于合并的Header显示

<DataTemplate x:Key="MergeHeader">
            <DataGrid HorizontalAlignment="Stretch" HorizontalGridLinesBrush="Transparent" BorderThickness="0" Margin="0" CanUserReorderColumns="False" CanUserSortColumns="False" CanUserResizeColumns="False">
                <DataGrid.Columns>
                    <DataGridTextColumn Header="产品批号" Width="*" IsReadOnly="True" />
                    <DataGridTextColumn Header="生产日期" IsReadOnly="True" Width="100" />
                    <DataGridTextColumn Header="有效期至" IsReadOnly="True"  Width="102" />
                    <DataGridTextColumn Header="tedsd" Width="126" IsReadOnly="True" />
                    <DataGridTextColumn Header="tesddff" Width="125"  IsReadOnly="True"/>
                </DataGrid.Columns>
                <DataGrid.Resources>
                    <Style TargetType="DataGridColumnHeader">
                        <Setter Property="Template" Value="{StaticResource styleMergeHeader}"/>
                    </Style>
                </DataGrid.Resources>
            </DataGrid>
        </DataTemplate>
另外一个模板用于显示合并明细信息，ItemsSource要绑定到你数据源的一个List属性，意思就是你把合并的明细信息放入到主DataGrid数据源的子List属性中，因为明细中不要显示Header所以把Header隐藏

<DataTemplate x:Key="MergeColumn">
            <DataGrid Name="dgMergeGrid" ItemsSource="{Binding MerageData}" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden" Loaded="dgMergeGrid_Loaded" BorderThickness="0,0,0,0" HorizontalAlignment="Center" HorizontalContentAlignment="Center" VerticalAlignment="Center" VerticalContentAlignment="Center" HeadersVisibility="None"  AutoGenerateColumns="False" IsReadOnly="True">
                <DataGrid.Columns>
                    <DataGridTextColumn Header="产品批号" Width="*" IsReadOnly="True" Binding="{Binding produceBatchNo}">
 
                    </DataGridTextColumn>
                    <DataGridTextColumn Header="生产日期"  IsReadOnly="True" Width="100" Binding="{Binding produceDate}" />
                    <DataGridTextColumn Header="有效期至"  IsReadOnly="True"  Width="102" Binding="{Binding exprieDate}" />
                    <DataGridTextColumn Header="dfafa"  Width="126" IsReadOnly="True" Binding="{Binding smallNum}" />
                    <DataGridTextColumn Header="fafsfdfd"  Width="125"  IsReadOnly="True" Binding="{Binding packUnit}" />
                </DataGrid.Columns>
                <DataGrid.Resources>
                    <Style TargetType="DataGrid">
                        <!--网格线颜色-->
                        <Setter Property="HorizontalGridLinesBrush">
                            <Setter.Value>
                                <SolidColorBrush Color="Transparent"/>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="VerticalGridLinesBrush">
                            <Setter.Value>
                                <SolidColorBrush Color="LightBlue"/>
                            </Setter.Value>
                        </Setter>
                    </Style>
                </DataGrid.Resources>
            </DataGrid>
        </DataTemplate>

然后在你的主DataGrid中的显示明细信息的列设置模板就可以了

<DataGridTemplateColumn  Header="批次信息" Width="580" HeaderTemplate="{StaticResource MergeHeader}" CellTemplate="{StaticResource MergeColumn}">
                    <DataGridTemplateColumn.HeaderStyle>
                        <Style TargetType="DataGridColumnHeader">
                            <Setter Property="Background" Value="LightBlue"></Setter>
                        </Style>
                    </DataGridTemplateColumn.HeaderStyle>
                </DataGridTemplateColumn>

WPF DataGrid 合并单元格