总结：WPF中模板需要绑定父级别的ViewModel该如何处理

     <ListBox ItemsSource="{Binding ClassCollection}">
                            <ListBox.ItemContainerStyle>
                                <Style TargetType="{x:Type ListBoxItem}">
                                    <Setter Property="Height" Value="30"/>
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate  TargetType="ListBoxItem">
                                                <Grid>
                                                    <Border x:Name="ItemBackground" 
                                                    Background="{TemplateBinding Background}"  
                                                    BorderBrush="{TemplateBinding BorderBrush}"
                                                    BorderThickness="{TemplateBinding BorderThickness}"/>

                                                    <CheckBox Content="{Binding Item2.Name}" IsChecked="{Binding Item1,Mode=TwoWay}">
                                                        <i:Interaction.Triggers>
                                                            <i:EventTrigger EventName="Checked">
                                                                <i:InvokeCommandAction Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:Control_CodeAutoGeneration}}, Path=DataContext.RelayCommand}" 
                                                                                       CommandParameter="ClassSelectionChanged"/>
                                                            </i:EventTrigger>

                                                            <i:EventTrigger EventName="Unchecked">
                                                                <i:InvokeCommandAction Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:Control_CodeAutoGeneration}}, Path=DataContext.RelayCommand}" 
                                                                                       CommandParameter="ClassSelectionChanged"/>
                                                            </i:EventTrigger>
                                                        </i:Interaction.Triggers>
                                                    </CheckBox>

                                                </Grid>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </ListBox.ItemContainerStyle>
                            <i:Interaction.Triggers>
                                <i:EventTrigger EventName="SelectionChanged">
                                    <i:InvokeCommandAction Command="{Binding RelayCommand}" CommandParameter="ClassSelectionChanged"/>
                                </i:EventTrigger>
                            </i:Interaction.Triggers>
                        </ListBox>

其中、需要在代码

 <i:InvokeCommandAction Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:Control_CodeAutoGeneration}}, Path=DataContext.RelayCommand}"   CommandParameter="ClassSelectionChanged"/>

处绑定的父级别，Control_CodeAutoGeneration是我自定义的控件的ViewModel里面的RelayCommand命令，通过如上传递可以调用到父级别的ViewModel的绑定属性或命令