我猜你确实已经验证了SelectedItem已经改变了(你可以暂时将Binding Mode设置为TwoWay以查看它是否相反,通过单击你应该看到突出显示的行和SelectedItem的set-method执行).如果是,请验证您是否与PropertyChanged方法调用上的属性名称完全匹配.由于您在此处不是类型安全的,因此可能会出现拼写错误.如果不是,请检查您的数据绑定属性是否设置正确.另一个想法是,您可能已经更改了DataGrid的样式或模板,现在您缺少一些Visual状态.可以使用样式模板设置DataGridRow的样式.您有三个选定状态,称为UnfocusedSelected(可能是右侧),NormalSelected和MouSEOverSelected.

您可以尝试使用此模板创建自己的Visual State：

<Style TargetType="local:DataGridRow">
<Setter Property="IsTabStop" Value="False" />
<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="local:DataGridRow">
            <localprimitives:DataGridFrozenGrid Name="Root">
                <vsm:VisualStateManager.VisualStateGroups>
                    <vsm:VisualStateGroup x:Name="CommonStates">
                        <vsm:VisualState x:Name="Normal"/>
                    <vsm:VisualState x:Name="NormalAlternatingRow">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Opacity" Duration="0" To="0"/>
                            </Storyboard>
                        </vsm:VisualState>
                        <vsm:VisualState x:Name="MouSEOver">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Opacity" Duration="0" To=".5"/>
                            </Storyboard>
                        </vsm:VisualState>
                        <vsm:VisualState x:Name="NormalSelected">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Opacity" Duration="0" To="1"/>
                            </Storyboard>
                        </vsm:VisualState>
                        <vsm:VisualState x:Name="MouSEOverSelected">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Opacity" Duration="0" To="1"/>
                            </Storyboard>
                        </vsm:VisualState>
                        <vsm:VisualState x:Name="UnfocusedSelected">
                            <Storyboard>
                                <DoubleAnimation Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Opacity" Duration="0" To="1"/>
                                <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="(Fill).Color" To="#FFE1E7EC"/>
                            </Storyboard>
                        </vsm:VisualState>
                    </vsm:VisualStateGroup>
                    <vsm:VisualStateGroup x:Name="ValidationStates">
                        <vsm:VisualState x:Name="Valid"/>
                        <vsm:VisualState x:Name="Invalid">
                            <Storyboard>
                                <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="Visibility">
                                    <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
                                </ObjectAnimationUsingKeyFrames>
                                <DoubleAnimation Storyboard.TargetName="InvalidVisualElement" Storyboard.TargetProperty="Opacity" Duration="0" To="1"/>
                            </Storyboard>
                        </vsm:VisualState>
                    </vsm:VisualStateGroup>
                </vsm:VisualStateManager.VisualStateGroups>
                <Grid.RowDefinitions>
                    <RowDefinition/>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="Auto"/>
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto" />
                    <ColumnDefinition/>
                </Grid.ColumnDefinitions>

                <Grid.Resources>
                    <Storyboard x:Key="DetailsVisibleTransition">
                        <DoubleAnimation Storyboard.TargetName="DetailsPresenter" Storyboard.TargetProperty="ContentHeight" Duration="00:00:0.1" />
                    </Storyboard>
                </Grid.Resources>

                <Rectangle x:Name="BackgroundRectangle" Grid.RowSpan="2" Grid.ColumnSpan="2" Opacity="0" Fill="#FFBADDE9"/>
                <Rectangle x:Name="InvalidVisualElement" Grid.RowSpan="2" Grid.ColumnSpan="2" Opacity="0" Fill="#FFF7D8DB"/>

                <localprimitives:DataGridRowHeader Grid.RowSpan="3" Name="RowHeader" localprimitives:DataGridFrozenGrid.IsFrozen="True" />
                <localprimitives:DataGridCellsPresenter Grid.Column="1" Name="CellsPresenter" localprimitives:DataGridFrozenGrid.IsFrozen="True" />
                <localprimitives:DataGridDetailsPresenter Grid.Row="1" Grid.Column="1" Name="DetailsPresenter" />
                <Rectangle Grid.Row="2" Grid.Column="1" Name="BottomGridLine" HorizontalAlignment="Stretch" Height="1" />
            </localprimitives:DataGridFrozenGrid>
        </ControlTemplate>
    </Setter.Value>
</Setter>
</Style>

这是一个关于自定义DataGrid样式的好的MSDN Article的复制粘贴.例如,您可以修改模板的UnfocusedSelected部分,看看是否看到任何更改,例如,在其周围添加红色边框等.

也许这值得一试.我希望你知道如何应用自己的风格.如果没有,这是另一个MSDN Resource.

我知道,这些只是提示,但最后可能会有所帮助.