两个视图引用相同的viewmodel属性和命令，但记录仅显示在第一个视图上而不显示在第二个视图上

Question

标题

以下是我的观点。第一个是主视图，第二个是另一个视图 它使用相同的视图模型和数据。它从excel获取数据并存储在网格中。问题是，在第一个主视图中，数据网格上的值正确显示，但是当我单击第一个视图上的可用按钮时，打开第二个视图，不显示记录但显示空白。我想在视图2上显示相同的记录。

在此处输入代码主视图： -

<Window x:Class="Main.View.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:PrestoControls="clr-namespace:PrestoControls;assembly=PrestoControls"
        xmlns:local="clr-namespace:Main.ViewModel"
        xmlns:localControls="clr-namespace:Main.View"
        x:Name="Window"
        Title="{Binding Scenario}"
        Width="1400"
        Height="800"
        WindowStartupLocation="CenterScreen"
        WindowState="Maximized">

    <Grid>

        <DataGrid x:Name="datagrid_sku_part_details"
            Grid.Row="0"
            Margin="10,5,0,5"
            ItemsSource="{Binding SKUPartDetailsSubset,
                                Mode=TwoWay,
                                UpdateSourceTrigger=PropertyChanged}"
            SelectedItem="{Binding SelectedSku,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
            SelectionUnit="FullRow"
            Style="{StaticResource style_main_datagrid}">

            <DataGrid.Columns>
                <DataGridTextColumn x:Name="col_sku_part_details_class"
                    Width="60"
                    Binding="{Binding Class}"
                    Header="{Binding RelativeSource={RelativeSource Self},
                                        Converter={StaticResource string_converter},
                                        ConverterParameter='col_sku_part_details_class'}"
                    IsReadOnly="true" />
                <DataGridTextColumn x:Name="col_sku_part_details_range"
                    Width="100"
                    Binding="{Binding Range}"
                    Header="{Binding RelativeSource={RelativeSource Self},
                                        Converter={StaticResource string_converter},
                                        ConverterParameter='col_sku_part_details_range'}"
                    IsReadOnly="true" />
                <DataGrid.Columns>

        </DataGrid>
        <Button x:Name="btn_run_Demand_multipliers_in_budget_years1"
                         Margin="10,10,-9,10"
                         DockPanel.Dock="Bottom"
                         Style="{StaticResource style_btn_run_ranges}"
                         Content="Demand multipliers in budget years"  
                         Command="{Binding DemandMultiplierInBudgetYear, Mode=TwoWay}" >
        </Button>
        <Grid>

第二视图

    <Window x:Class="Main.View.MultiplierForBudgetReport"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MultiplierForBudgetReport" Height="500" Width="900"
        xmlns:PrestoControls="clr-namespace:PrestoControls;assembly=PrestoControls"
        xmlns:local="clr-namespace:Main.ViewModel"
        xmlns:localControls="clr-namespace:Main.View"
        xmlns:sync="clr-namespace:Main.ViewModel.Synchronisation"
        x:Name="Window"

        >

                <Grid>
                    <Grid x:Name="grid_sku_part_details">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="16*"/>
                            <ColumnDefinition Width="489*"/>
                        </Grid.ColumnDefinitions>

                        <Grid.RowDefinitions>
                            <RowDefinition Height="*" />
                            <RowDefinition Height="50" />
                        </Grid.RowDefinitions>

                        <DataGrid x:Name="datagrid_sku_part_details"
                                Grid.Row="0"
                                Margin="10,5,0,5"
                                ItemsSource="{Binding SKUPartDetailsSubset,
                                                    Mode=TwoWay,
                                                    UpdateSourceTrigger=PropertyChanged}"
                                SelectedItem="{Binding SelectedSku,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"

                                SelectionUnit="FullRow"
                                Style="{StaticResource style_main_datagrid}" Grid.ColumnSpan="2" SelectionChanged="datagrid_sku_part_details_SelectionChanged">

                            <DataGrid.Columns>
                                <DataGridTextColumn x:Name="col_sku_part_details_class"
                                    Width="60"
                                    Binding="{Binding Class}"
                                    Header="{Binding RelativeSource={RelativeSource Self},
                                                        Converter={StaticResource string_converter},
                                                        ConverterParameter='col_sku_part_details_class'}"
                                    IsReadOnly="true" />
                                <DataGridTextColumn x:Name="col_sku_part_details_range"
                                    Width="100"
                                    Binding="{Binding Range}"
                                    Header="{Binding RelativeSource={RelativeSource Self},
                                                        Converter={StaticResource string_converter},
                                                        ConverterParameter='col_sku_part_details_range'}"
                                    IsReadOnly="true" />
                                <DataGridTextColumn x:Name="col_sku_part_details_sku_reference"
                                    Width="150"
                                    Binding="{Binding SKUReference}"
                                    Header="{Binding RelativeSource={RelativeSource Self},
                                                        Converter={StaticResource string_converter},
                                                        ConverterParameter='col_sku_part_details_sku_reference'}"
                                    IsReadOnly="true" />
                                <DataGridTextColumn x:Name="col_sku_part_details_part_reference"
                                    Width="150"
                                    Binding="{Binding PartReference}"
                                    Header="{Binding RelativeSource={RelativeSource Self},
                                                        Converter={StaticResource string_converter},
                                                        ConverterParameter='col_sku_part_details_part_reference'}"
                                    IsReadOnly="true" />
                                <DataGridTextColumn x:Name="col_sku_part_details_part_name"
                                    Width="250"
                                    Binding="{Binding PartName}"
                                    Header="{Binding RelativeSource={RelativeSource Self},
                                                        Converter={StaticResource string_converter},
                                                        ConverterParameter='col_sku_part_details_part_name'}"
                                    IsReadOnly="true" />
                            </DataGrid.Columns>
                        </DataGrid>

                    </Grid>
                </Grid> enter code here
            </Window>

下面是用于按钮的命令： -

public class DemandMultiplierBudYearCommand : ICommand
{

    #region Fields

    private MainWindowViewModel m_ViewModel;

    #endregion

    #region Constructor

    public DemandMultiplierBudYearCommand(MainWindowViewModel viewModel)
    {
        m_ViewModel = viewModel;
    }

    #endregion

    #region ICommand Members

    /// <summary>
    /// Whether the command is enabled.
    /// </summary>
    public bool CanExecute(object parameter)
    {
        return true;
    }

    /// <summary>
    /// Actions to take when CanExecute() changes.
    /// </summary>
    public event EventHandler CanExecuteChanged
    {
        add { CommandManager.RequerySuggested += value; }
        remove { CommandManager.RequerySuggested -= value; }
    }

    /// <summary>
    /// Executes the command
    /// </summary>
    public void Execute(object parameter)
    {

        View.MultiplierForBudgetReport Mfbg = new View.MultiplierForBudgetReport();
        Mfbg.DataContext = m_ViewModel;
        Mfbg.ShowDialog();
    }

    #endregion
}