返回到同一页之后，不再选择“数据网格”的SelectedRow [英] SelectedRow of datagrid is not selected again after returning to same Page

查看：288 发布时间：2017/3/27 0:25:54 c# wpf datagrid

本文介绍了返回到同一页之后，不再选择“数据网格”的SelectedRow的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有两个不同的页面选择和编辑。两者共享相同的ViewModel名为SalesAccountsViewModel。

我在选择页面中有一个DataGrid，如下所示：

img src =https://i.stack.imgur.com/la8H9.jpgalt =enter image description here>

然后我选择它任何项目来自DataGrid：

然后我点击选定行上的编辑按钮，如下所示：

之后，我被重定向到另一个页面，如下所示： / p>

当我点击保存按钮时：

我再次被重定向到上一页，但可以看到第一行吗？它没有被突出显示：

以下是我使用的选择页面：

 页面x：Class =MiniAccountWPF.Views.Pages.Masters.SalesAccounts.Select
 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：vm =clr-namespace：MiniAccountWPF.ViewModels.Masters
 mc：Ignorable =d
d：DesignHeight =300d：DesignWidth =300
标题=选择DataContext ={StaticResource salesAccountsViewModel}> 
 
< Grid> 
 
< Grid.RowDefinitions> 
< RowDefinition Height =Auto/> 
< RowDefinition Height =*/> 
< RowDefinition Height =Auto/> 
< /Grid.RowDefinitions> 
 
< Button Grid.Row =0Margin =0,10HorizontalAlignment =Left
 Content ={Binding SelectedChildMenuItem.MenuItemName，Converter = {StaticResource createButtonContentConverter} Source = {StaticResource mainWindowViewModel}}/> 
 
< DataGrid Grid.Row =1ItemsSource ={Binding Ledgers}SelectedValue ={Binding SelectedLedger}
 IsReadOnly =TrueAutoGenerateColumns =FalseSelectionMode = SingleSelectionUnit =FullRow> 
< DataGrid.Columns> 
< DataGridTextColumn Header =客户名称Binding ={Binding LedgerName}/> 
< DataGridTextColumn Header =CityBinding ={Binding City}/> 
< DataGridTemplateColumn Header =Mobile Numbers> 
< DataGridTemplateColumn.CellTemplate> 
< DataTemplate> 
< TextBlock> 
< Run Text ={Binding MobileNo1，Converter = {StaticResource mobileNumberFormatConverter}，ConverterParameter = N}/> 
< Run Text ={Binding MobileNo1，Converter = {StaticResource mobileNumberFormatConverter}，ConverterParameter = S}FontFamily =Consolas/> 
< Run Text =FontFamily =Consolas/> 
< Run Text ={Binding MobileNo2，Converter = {StaticResource mobileNumberFormatConverter}，ConverterParameter = N}/> 
< Run Text ={Binding MobileNo2，Converter = {StaticResource mobileNumberFormatConverter}，ConverterParameter = S}FontFamily =Consolas/> 
< / TextBlock> 
< / DataTemplate> 
< /DataGridTemplateColumn.CellTemplate> 
< / DataGridTemplateColumn> 
< DataGridTextColumn Header =期初余额Binding ={Binding OpeningBalance}/> 
< DataGridTemplateColumn标题=编辑> 
< DataGridTemplateColumn.CellTemplate> 
< DataTemplate> 
< Button Content =EditStyle ={StaticResource EditButton}
 Command ={Binding DataContext.EditCommand，RelativeSource = {RelativeSource Mode = FindAncestor，AncestorType = {x：Type Page}} }/> 
< / DataTemplate> 
< /DataGridTemplateColumn.CellTemplate> 
< / DataGridTemplateColumn> 
< DataGridTemplateColumn标题=删除> 
< DataGridTemplateColumn.CellTemplate> 
< DataTemplate> 
< Button Content =DeleteStyle ={StaticResource DeleteButton}/> 
< / DataTemplate> 
< /DataGridTemplateColumn.CellTemplate> 
< / DataGridTemplateColumn> 
< /DataGrid.Columns> 
< / DataGrid> 
 
< / Grid> 
 
< / Page>

这是编辑页面：

 < Page x：Class =MiniAccountWPF.Views.Pages.Masters.SalesAccounts.Edit
 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-兼容性/ 2006
 xmlns：d =http://schemas.microsoft.com/expression/blend/2008
 xmlns：vm =clr-namespace：MiniAccountWPF.ViewModels.Masters
 mc：Ignorable =d
d：DesignHeight =300d：DesignWidth =300
标题=编辑DataContext ={StaticResource salesAccountsViewModel}> 
 
< Grid DataContext ={Binding SelectedLedger}> 
< Grid.RowDefinitions> 
< RowDefinition Height =40/> 
< RowDefinition Height =Auto/> 
< RowDefinition Height =10/> 
< RowDefinition Height =Auto/> 
< RowDefinition Height =10/> 
< RowDefinition Height =Auto/> 
< RowDefinition Height =10/> 
< RowDefinition Height =Auto/> 
< RowDefinition Height =10/> 
< RowDefinition Height =30/> 
< RowDefinition Height =Auto/> 
< RowDefinition Height =Auto/> 
< /Grid.RowDefinitions> 
 
< Grid.ColumnDefinitions> 
< ColumnDefinition Width =50/> 
< ColumnDefinition Width =Auto/> 
< ColumnDefinition Width =*/> 
< ColumnDefinition Width =20/> 
< ColumnDefinition Width =*/> 
< ColumnDefinition Width =350/> 
< /Grid.ColumnDefinitions> 
 
< TextBlock Grid.Row =1Grid.Column =1Text =NameStyle ={StaticResource txtBlock}/> 
< TextBlock Grid.Row =1Grid.Column =1Text =：HorizontalAlignment =RightStyle ={StaticResource txtBlock}/> 
< TextBox Grid.Row =1Grid.Column =2Grid.ColumnSpan =3Text ={Binding LedgerName}/> 
 
< TextBlock Grid.Row =3Grid.Column =1Text =CityStyle ={StaticResource txtBlock}/> 
< TextBlock Grid.Row =3Grid.Column =1Text =：HorizontalAlignment =RightStyle ={StaticResource txtBlock}/> 
< TextBox Grid.Row =3Grid.Column =2Text ={Binding City}/> 
 
< TextBlock Grid.Row =5Grid.Column =1Text =Mobile No. Style ={StaticResource txtBlock}/> 
< TextBlock Grid.Row =5Grid.Column =1Text =：HorizontalAlignment =RightStyle ={StaticResource txtBlock}/> 
< TextBox Grid.Row =5Grid.Column =2Text ={Binding MobileNo1}/> 
< TextBox Grid.Row =5Grid.Column =4Text ={Binding MobileNo2}/> 
 
< TextBlock Grid.Row =7Grid.Column =1Text =Opening BalanceStyle ={StaticResource txtBlock}/> 
< TextBlock Grid.Row =7Grid.Column =1Text =：HorizontalAlignment =RightStyle ={StaticResource txtBlock}/> 
< TextBox Grid.Row =7Grid.Column =2Text ={Binding OpeningBalance}/> 
 
< Grid Grid.Row =10Grid.Column =4> 
< Grid.ColumnDefinitions> 
< ColumnDefinition Width =*/> 
< ColumnDefinition Width =Auto/> 
< ColumnDefinition Width =10/> 
< ColumnDefinition Width =Auto/> 
< /Grid.ColumnDefinitions> 
 
< Button Grid.Column =1Content =保存
 Command ={Binding DataContext.EditSaveCommand，RelativeSource = {RelativeSource Mode = FindAncestor，AncestorType = {x：Type页}}}/> 
< Button Grid.Column =3Content =取消HorizontalAlignment =Left
 Command ={Binding DataContext.EditCancelCommand，RelativeSource = {RelativeSource Mode = FindAncestor，AncestorType = {x：键入页面}}}/> 
 
< / Grid> 
 
< / Grid> 
 
< / Page>

ViewModel：

 命名空间MiniAccountWPF.ViewModels.Masters 
 {
 public class SalesAccountsViewModel：ViewModelBase，IModule 
 {
 public SalesAccountsViewModel（）
 {
 
 SessionViewModel.Instance.ModulesOpen.Add（（IModule）this）; 
 
 using（MiniAccountDBEntities db = new MiniAccountDBEntities（））
 {
 Ledgers = new ObservableCollection< Ledger>（db.Ledgers.Where（x => x.LedgerType.LedgerTypeName ==客户））; 
} 
 
 EditCommand = new RelayCommand（Edit_Click）; 
 EditSaveCommand = new RelayCommand（Edit_Save_Click）; 
 EditCancelCommand = new RelayCommand（Edit_Cancel_Click）; 
} 
 
〜SalesAccountsViewModel（）
 {
 SessionViewModel.Instance.ModulesOpen.Remove（（IModule）this）; 
} 
 
 private ObservableCollection< Ledger> _ledgers; 
 public ObservableCollection< Ledger> Ledgers 
 {
 get 
 {
 return _ledgers; 
} 
 set 
 {
 _ledgers = value; 
 OnPropertyChanged（Ledgers）; 
} 
} 
 
 private Ledger _selectedLedger; 
 public Ledger SelectedLedger 
 {
 get 
 {
 return _selectedLedger; 
} 
 set 
 {
 _selectedLedger = value; 
 OnPropertyChanged（SelectedLedger）; 
} 
} 
 
 public ICommand EditCommand {get;组; 
 
 private void Edit_Click（object obj）
 {
 var mainWindowVM = SessionViewModel.GetModuleInstance（MainWindow，MiniAccountWPF.ViewModels.MainWindowViewModel）; 
（（MainWindowViewModel）mainWindowVM）.InnerSourcePage =（（MainWindowViewModel）mainWindowVM）.SelectedChildMenuItem.EditFrameNavigationURL; 
} 
 
 public ICommand EditSaveCommand {get;组; 
 
 private void Edit_Save_Click（object obj）
 {
 using（MiniAccountDBEntities db = new MiniAccountDBEntities（））
 {
 Ledger分类帐= db.Ledgers .Single（x => x.LedgerID == SelectedLedger.LedgerID）; 
 ledger.LedgerName = SelectedLedger.LedgerName; 
 ledger.City = SelectedLedger.City; 
 ledger.MobileNo1 = SelectedLedger.MobileNo1; 
 ledger.MobileNo2 = SelectedLedger.MobileNo2; 
 ledger.OpeningBalance = SelectedLedger.OpeningBalance; 
 db.SaveChanges（）; 
 
 var mainWindowVM = SessionViewModel.GetModuleInstance（MainWindow，MiniAccountWPF.ViewModels.MainWindowViewModel）; 
（（MainWindowViewModel）mainWindowVM）.InnerSourcePage =（（MainWindowViewModel）mainWindowVM）.SelectedChildMenuItem.SelectFrameNavigationURL; 
} 
} 
 
 public ICommand EditCancelCommand {get;组; 
 
 private void Edit_Cancel_Click（object obj）
 {
 var mainWindowVM = SessionViewModel.GetModuleInstance（MainWindow，MiniAccountWPF.ViewModels.MainWindowViewModel）; 
（（MainWindowViewModel）mainWindowVM）.InnerSourcePage =（（MainWindowViewModel）mainWindowVM）.SelectedChildMenuItem.SelectFrameNavigationURL; 
} 
 
 public string ModuleFriendlyName 
 {
 get {returnSalesAccountsViewModel; } 
} 
 
 public string ModuleName 
 {
 get {returnSalesAccounts; } 
} 
} 
}

适用于DataGrid的样式ResourceDictionary：

 < Style TargetType ={x：Type DataGrid}> 
< Setter Property =GridLinesVisibilityValue =Vertical/> 
< Setter Property =RowHeaderWidthValue =0/> 
< / Style> 
 
< Style TargetType ={x：Type DataGridColumnHeader}> 
< Setter Property =BackgroundValue ={StaticResource BrushHeaderBackground}/> 
< Setter Property =ForegroundValue =White/> 
< Setter Property =PaddingValue =10/> 
< Setter Property =FontSizeValue =16/> 
< Setter Property =FontWeightValue =SemiBold/> 
< Setter Property =HorizontalContentAlignmentValue =Center/> 
< Setter Property =BorderBrushValue =White/> 
< Setter Property =BorderThicknessValue =1,0/> 
 
< Style.Triggers> 
< MultiTrigger> 
< MultiTrigger.Conditions> 
< Condition Property =IsMouseOverValue =True/> 
< Condition Property =CanUserSortValue =True/> 
< /MultiTrigger.Conditions> 
< MultiTrigger.Setters> 
< Setter Property =BackgroundValue ={StaticResource BrushOrangeSelector}/> 
< /MultiTrigger.Setters> 
< / MultiTrigger> 
< MultiTrigger> 
< MultiTrigger.Conditions> 
< Condition Property =IsPressedValue =True/> 
< Condition Property =CanUserSortValue =True/> 
< /MultiTrigger.Conditions> 
< MultiTrigger.Setters> 
< Setter Property =BackgroundValue ={StaticResource BrushBlueSelector}/> 
< /MultiTrigger.Setters> 
< / MultiTrigger> 
< /Style.Triggers> 
< / Style> 
 
< Style TargetType ={x：Type DataGridCell}> 
 
< Setter属性=模板> 
< Setter.Value> 
< ControlTemplate TargetType ={x：Type DataGridCell}> 
< Grid Background ={TemplateBinding Background}> 
< ContentPresenter VerticalAlignment =CenterHorizontalAlignment =Center/> 
< / Grid> 
< / ControlTemplate> 
< /Setter.Value> 
< / Setter> 
 
< Setter Property =BackgroundValue =Gray/> 
< Setter Property =ForegroundValue =White/> 
< Setter Property =PaddingValue =10/> 
< Setter Property =FontSizeValue =16/> 
 
< Style.Triggers> 
< Trigger Property =IsSelectedValue =True> 
< Setter Property =BackgroundValue ={StaticResource BrushBlueSelector}/> 
< / Trigger> 
< /Style.Triggers> 
 
< / Style> 
 
< Style TargetType ='{x：Type DataGridRow}'> 
< Setter Property =BackgroundValue =Gray/> 
< Setter Property =HorizontalContentAlignmentValue =Center/> 
< Style.Triggers> 
< Trigger Property =IsSelectedValue =True> 
< Setter Property =BackgroundValue ={StaticResource BrushBlueSelector}/> 
< / Trigger> 
< /Style.Triggers> 
< / Style>

解决方案

问题是视图模型，每个视图，导致人事收藏的多个副本

所以我确实为单实例在ServiceLocator中为虚拟机添加了一个属性，并初始化了相同的

  public ListViewModel ListViewModel {get; set;}

然后我从列表视图中替换视图模型的声明，以指向此属性

  DataContext ={Binding ListViewModel，Source = {x：Static vm：ServiceLocator.Instance}}

这解决了集合的多个实例的问题，但是再次datagrid有一些问题重做选择，所以我添加了一个datatrigger的样式重新应用选择

 < DataGrid.RowStyle> 
< Style TargetType =DataGridRow> 
< Style.Triggers> 
< Trigger Property =IsSelected
 Value =true> 
< Setter Property =Background
 Value ={DynamicResource {x：Static SystemColors.HighlightBrushKey}}/> 
< Setter Property =Foreground
 Value ={DynamicResource {x：Static SystemColors.HighlightTextBrushKey}}/> 
< / Trigger> 
< /Style.Triggers> 
< / Style> 
< /DataGrid.RowStyle>

此触发器将确保即使重新加载该页面也会选择行。

 
 
 这里是工作示例 
 
 
 
 
 
  编辑 
 
 
 这里是一个解决方案在将ListView中DataGrid中的Metro.xaml 
 
 
  remove  DataGrid.RowStyle 在Metro.xaml中，这些
 < Style TargetType ={x：Type DataGridCell}> 
< Setter Property =Template> 
< Setter.Value> 
< ControlTemplate TargetType ={x：Type DataGridCell}> 
< ContentPresenter VerticalAlignment =CenterHorizontalAlignment =Center/> 
< / ControlTemplate> 
< /Setter.Value> 
< / Setter> 
< Setter Property =FontSizeValue =16/> 
< Style.Triggers> 
< Trigger Property =IsSelectedValue =True> 
< Setter Property =ForegroundValue =Black/> 
< / Trigger> 
< /Style.Triggers> 
< / Style> 
 
< Style TargetType ='{x：Type DataGridRow}'> 
< Setter Property =TextElement.ForegroundValue =White/> 
< Setter Property =BackgroundValue =Gray/> 
< Setter Property =HeightValue =50/> 
< Setter Property =HorizontalContentAlignmentValue =Center/> 
< Style.Triggers> 
< Trigger Property =IsSelectedValue =True> 
< Setter Property =BackgroundValue =＃FFE1AF4D/> 
< Setter Property =TextElement.ForegroundValue =Black/> 
< / Trigger> 
< /Style.Triggers> 
< / Style> 
  
 
I have two different Pages called Select and Edit. Both of them shares same ViewModel named SalesAccountsViewModel.

I have a DataGrid in Select Page as follows:



Then I select it any Item from the DataGrid :



Then I click on edit button on selected row as shown below:



After that I am redirected to another Page as shown below:



When I click on save button:



I am again redirected to the Previous Page but can you see the first row? It is not Highlighted fully:



Here is Select Page that I use:
<Page x:Class="MiniAccountWPF.Views.Pages.Masters.SalesAccounts.Select"
      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:vm="clr-namespace:MiniAccountWPF.ViewModels.Masters"
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
    Title="Select" DataContext="{StaticResource salesAccountsViewModel}">

    <Grid>

        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <Button Grid.Row="0" Margin="0,10" HorizontalAlignment="Left" 
                Content="{Binding SelectedChildMenuItem.MenuItemName, Converter={StaticResource createButtonContentConverter}, Source={StaticResource mainWindowViewModel}}" />

        <DataGrid Grid.Row="1" ItemsSource="{Binding Ledgers}" SelectedValue="{Binding SelectedLedger}" 
                  IsReadOnly="True" AutoGenerateColumns="False" SelectionMode="Single" SelectionUnit="FullRow">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Customer Name" Binding="{Binding LedgerName}" />
                <DataGridTextColumn Header="City" Binding="{Binding City}" />
                <DataGridTemplateColumn Header="Mobile Numbers">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock>
                                    <Run Text="{Binding MobileNo1, Converter={StaticResource mobileNumberFormatConverter}, ConverterParameter=N}" />
                                    <Run Text="{Binding MobileNo1, Converter={StaticResource mobileNumberFormatConverter}, ConverterParameter=S}" FontFamily="Consolas"/>
                                    <Run Text="   " FontFamily="Consolas"/>
                                    <Run Text="{Binding MobileNo2, Converter={StaticResource mobileNumberFormatConverter}, ConverterParameter=N}" />
                                    <Run Text="{Binding MobileNo2, Converter={StaticResource mobileNumberFormatConverter}, ConverterParameter=S}" FontFamily="Consolas"/>
                            </TextBlock>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTextColumn Header="Opening Balance" Binding="{Binding OpeningBalance}" />
                <DataGridTemplateColumn Header="Edit">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Button Content="Edit" Style="{StaticResource EditButton}" 
                                    Command="{Binding DataContext.EditCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Page}}}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="Delete">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Button Content="Delete" Style="{StaticResource DeleteButton}" />
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>

    </Grid>

</Page>
Here is the Edit Page:
<Page x:Class="MiniAccountWPF.Views.Pages.Masters.SalesAccounts.Edit"
      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:vm="clr-namespace:MiniAccountWPF.ViewModels.Masters"
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
    Title="Edit" DataContext="{StaticResource salesAccountsViewModel}">

    <Grid DataContext="{Binding SelectedLedger}">
        <Grid.RowDefinitions>
            <RowDefinition Height="40" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="10" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="10" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="10" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="10" />
            <RowDefinition Height="30" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="50" />
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="20" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="350" />
        </Grid.ColumnDefinitions>

        <TextBlock Grid.Row="1" Grid.Column="1" Text="Name" Style="{StaticResource txtBlock}"/>
        <TextBlock Grid.Row="1" Grid.Column="1" Text=" : " HorizontalAlignment="Right" Style="{StaticResource txtBlock}"/>
        <TextBox Grid.Row="1" Grid.Column="2" Grid.ColumnSpan="3" Text="{Binding LedgerName}"/>

        <TextBlock Grid.Row="3" Grid.Column="1" Text="City" Style="{StaticResource txtBlock}"/>
        <TextBlock Grid.Row="3" Grid.Column="1" Text=" : " HorizontalAlignment="Right" Style="{StaticResource txtBlock}"/>
        <TextBox Grid.Row="3" Grid.Column="2" Text="{Binding City}"/>

        <TextBlock Grid.Row="5" Grid.Column="1" Text="Mobile No." Style="{StaticResource txtBlock}"/>
        <TextBlock Grid.Row="5" Grid.Column="1" Text=" : " HorizontalAlignment="Right" Style="{StaticResource txtBlock}"/>
        <TextBox Grid.Row="5" Grid.Column="2" Text="{Binding MobileNo1}"/>
        <TextBox Grid.Row="5" Grid.Column="4" Text="{Binding MobileNo2}"/>

        <TextBlock Grid.Row="7" Grid.Column="1" Text="Opening Balance    " Style="{StaticResource txtBlock}"/>
        <TextBlock Grid.Row="7" Grid.Column="1" Text=" : " HorizontalAlignment="Right" Style="{StaticResource txtBlock}"/>
        <TextBox Grid.Row="7" Grid.Column="2" Text="{Binding OpeningBalance}"/>

        <Grid Grid.Row="10" Grid.Column="4">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="10" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>

            <Button Grid.Column="1" Content="Save" 
                    Command="{Binding DataContext.EditSaveCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Page}}}"/>
            <Button Grid.Column="3" Content="Cancel" HorizontalAlignment="Left" 
                    Command="{Binding DataContext.EditCancelCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Page}}}"/>

        </Grid>

    </Grid>

</Page>
The ViewModel:
namespace MiniAccountWPF.ViewModels.Masters
{
    public class SalesAccountsViewModel: ViewModelBase, IModule
    {
        public SalesAccountsViewModel()
        {

            SessionViewModel.Instance.ModulesOpen.Add((IModule)this);

            using (MiniAccountDBEntities db = new MiniAccountDBEntities())
            {
                Ledgers = new ObservableCollection<Ledger>(db.Ledgers.Where(x => x.LedgerType.LedgerTypeName == "Customer"));
            }

            EditCommand = new RelayCommand(Edit_Click);
            EditSaveCommand = new RelayCommand(Edit_Save_Click);
            EditCancelCommand = new RelayCommand(Edit_Cancel_Click);
        }

        ~SalesAccountsViewModel()
        {
            SessionViewModel.Instance.ModulesOpen.Remove((IModule)this);
        }

        private ObservableCollection<Ledger> _ledgers;
        public ObservableCollection<Ledger> Ledgers
        {
            get
            {
                return _ledgers;
            }
            set
            {
                _ledgers = value;
                OnPropertyChanged("Ledgers");
            }
        }

        private Ledger _selectedLedger;
        public Ledger SelectedLedger
        {
            get
            {
                return _selectedLedger;
            }
            set
            {
                _selectedLedger = value;
                OnPropertyChanged("SelectedLedger");
            }
        }

        public ICommand EditCommand { get; set; }

        private void Edit_Click(object obj)
        {
            var mainWindowVM = SessionViewModel.GetModuleInstance("MainWindow", "MiniAccountWPF.ViewModels.MainWindowViewModel");
            ((MainWindowViewModel)mainWindowVM).InnerSourcePage = ((MainWindowViewModel)mainWindowVM).SelectedChildMenuItem.EditFrameNavigationURL;
        }

        public ICommand EditSaveCommand { get; set; }

        private void Edit_Save_Click(object obj)
        {
            using (MiniAccountDBEntities db = new MiniAccountDBEntities())
            {
                Ledger ledger = db.Ledgers.Single(x => x.LedgerID == SelectedLedger.LedgerID);
                ledger.LedgerName = SelectedLedger.LedgerName;
                ledger.City = SelectedLedger.City;
                ledger.MobileNo1 = SelectedLedger.MobileNo1;
                ledger.MobileNo2 = SelectedLedger.MobileNo2;
                ledger.OpeningBalance = SelectedLedger.OpeningBalance;
                db.SaveChanges();

                var mainWindowVM = SessionViewModel.GetModuleInstance("MainWindow", "MiniAccountWPF.ViewModels.MainWindowViewModel");
                ((MainWindowViewModel)mainWindowVM).InnerSourcePage = ((MainWindowViewModel)mainWindowVM).SelectedChildMenuItem.SelectFrameNavigationURL;
            }
        }

        public ICommand EditCancelCommand { get; set; }

        private void Edit_Cancel_Click(object obj)
        {
                var mainWindowVM = SessionViewModel.GetModuleInstance("MainWindow", "MiniAccountWPF.ViewModels.MainWindowViewModel");
                ((MainWindowViewModel)mainWindowVM).InnerSourcePage = ((MainWindowViewModel)mainWindowVM).SelectedChildMenuItem.SelectFrameNavigationURL;
        }

        public string ModuleFriendlyName
        {
            get { return "SalesAccountsViewModel"; }
        }

        public string ModuleName
        {
            get { return "SalesAccounts"; }
        }
    }
}
Styles applied to DataGrid in ResourceDictionary:
<Style TargetType="{x:Type DataGrid}">
    <Setter Property="GridLinesVisibility" Value="Vertical" />
    <Setter Property="RowHeaderWidth" Value="0" />
</Style>

<Style TargetType="{x:Type DataGridColumnHeader}">
    <Setter Property="Background" Value="{StaticResource BrushHeaderBackground}" />
    <Setter Property="Foreground" Value="White" />
    <Setter Property="Padding" Value="10" />
    <Setter Property="FontSize" Value="16" />
    <Setter Property="FontWeight" Value="SemiBold" />
    <Setter Property="HorizontalContentAlignment" Value="Center"/>
    <Setter Property="BorderBrush" Value="White" />
    <Setter Property="BorderThickness" Value="1,0" />

    <Style.Triggers>
        <MultiTrigger>
            <MultiTrigger.Conditions>
                <Condition Property="IsMouseOver" Value="True" />
                <Condition Property="CanUserSort" Value="True" />
            </MultiTrigger.Conditions>
            <MultiTrigger.Setters>
                <Setter Property="Background" Value="{StaticResource BrushOrangeSelector}" />
            </MultiTrigger.Setters>
        </MultiTrigger>
        <MultiTrigger>
            <MultiTrigger.Conditions>
                <Condition Property="IsPressed" Value="True" />
                <Condition Property="CanUserSort" Value="True" />
            </MultiTrigger.Conditions>
            <MultiTrigger.Setters>
                <Setter Property="Background" Value="{StaticResource BrushBlueSelector}" />
            </MultiTrigger.Setters>
        </MultiTrigger>
    </Style.Triggers>
</Style>

<Style TargetType="{x:Type DataGridCell}">

    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type DataGridCell}">
                <Grid Background="{TemplateBinding Background}">
                    <ContentPresenter VerticalAlignment="Center" HorizontalAlignment="Center" />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>

    <Setter Property="Background" Value="Gray" />
    <Setter Property="Foreground" Value="White" />
    <Setter Property="Padding" Value="10" />
    <Setter Property="FontSize" Value="16" />

    <Style.Triggers>
        <Trigger Property="IsSelected" Value="True">
            <Setter Property="Background" Value="{StaticResource BrushBlueSelector}" />
        </Trigger>
    </Style.Triggers>

</Style>

<Style TargetType='{x:Type DataGridRow}'>
    <Setter Property="Background" Value="Gray" />
    <Setter Property="HorizontalContentAlignment" Value="Center"/>
    <Style.Triggers>
        <Trigger Property="IsSelected" Value="True">
            <Setter Property="Background" Value="{StaticResource BrushBlueSelector}" />
        </Trigger>
    </Style.Triggers>
</Style>

 解决方案 
the issue was view model, which was getting created with every view, leading to multiple copies of person collection

so I did place a property for VM in ServiceLocator for single instance and initialized the same
public ListViewModel ListViewModel {get; set;}
then I replaced the declaration of view model from the list view to point to this property
DataContext="{Binding ListViewModel, Source={x:Static vm:ServiceLocator.Instance}}"
this solves the problem of multiple instance of the collection but again datagrid has some problem redoing the selection so I added a style with datatrigger to reapply the selection
    <DataGrid.RowStyle>
        <Style TargetType="DataGridRow">
            <Style.Triggers>
                <Trigger Property="IsSelected"
                         Value="true">
                    <Setter Property="Background"
                            Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}" />
                    <Setter Property="Foreground"
                            Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </DataGrid.RowStyle>
this trigger will ensure the row looks selected even if the page is reloaded.

here is a working sample



EDIT

here is a solution for the issue after merging Metro.xaml

remove DataGrid.RowStyle from the DataGrid in ListView and replace the mentioned styles in Metro.xaml with these
<Style TargetType="{x:Type DataGridCell}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type DataGridCell}">
                <ContentPresenter VerticalAlignment="Center" HorizontalAlignment="Center" />
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Setter Property="FontSize" Value="16" />
    <Style.Triggers>
        <Trigger Property="IsSelected" Value="True">
            <Setter Property="Foreground" Value="Black" />
        </Trigger>
    </Style.Triggers>
</Style>

<Style TargetType='{x:Type DataGridRow}'>
    <Setter Property="TextElement.Foreground" Value="White" />
    <Setter Property="Background" Value="Gray" />
    <Setter Property="Height" Value="50" />
    <Setter Property="HorizontalContentAlignment" Value="Center"/>
    <Style.Triggers>
        <Trigger Property="IsSelected" Value="True">
            <Setter Property="Background" Value="#FFE1AF4D" />
            <Setter Property="TextElement.Foreground" Value="Black" />
        </Trigger>
    </Style.Triggers>
</Style>


                        
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返回到同一页之后，不再选择“数据网格”的SelectedRow [英] SelectedRow of datagrid is not selected again after returning to same Page

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返回到同一页之后，不再选择“数据网格”的SelectedRow [英] SelectedRow of datagrid is not selected again after returning to same Page

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