Question

我正在使用Caliburn.Micro构建桌面MVVM应用程序，但无法更新ListView。

这是我的模特

 public class Answer
    {
        public int AnswerType { get; set; }
        public string CorrectAnswer { get; set; }
    }

    public class TestCaseConfig
    {
        public float MaxReactionTime { get; set; }
        public List<Answer> Answers { get; set; }
    }

并且我正在使用ObservableDictionary通知视图集合已更改（http://blogs.microsoft.co.il/shimmy/2010/12/26/observabledictionarylttkey-tvaluegt-c/）

public ObservableDictionary<string, TestCaseConfig> testCaseConfigs { get; set; }

但是当我更新（在List<Answer> Answers中添加或删除项目）时，我的视图什么也没做

我发现这个问题是由于当我们更改集合中的某些内容时也会更改其内存地址，但是Caliburn不对此更改做出反应并继续显示以前的列表。

这是我的view.xaml：

<UserControl x:Class="Gillie.Barney.Views.ExaminationAnswerSetupView"
             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:localization="clr-namespace:Gillie.Barney.Properties"
             xmlns:cal="http://www.caliburnproject.org"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">

    <UserControl.Resources>
        <ResourceDictionary>
            <Style TargetType="ListViewItem">
                <Setter Property="HorizontalContentAlignment"
                            Value="Stretch" />
                <Style.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter Property="IsSelected" Value="True"/>
                    </Trigger>
                </Style.Triggers>
            </Style>
        </ResourceDictionary>
    </UserControl.Resources>

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition Height="39*"/>
            <RowDefinition Height="5*"/>
        </Grid.RowDefinitions>
        <ListView 
            Name="BaseListView"
            Margin="10" 
            Grid.Row="1" 
            ItemsSource="{Binding testCaseConfigs}"
            HorizontalContentAlignment="Center" Grid.ColumnSpan="2"
            SelectedItem ="{Binding TestCasesConfigSelectedItem, Mode=TwoWay}">
            <ListView.View>
                <GridView>
                    <GridViewColumn 
                        Header="{x:Static localization:Resources.TestCaseNameLable}" 
                        DisplayMemberBinding="{Binding Key}" />
                    <GridViewColumn Header="Reaction Time">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <TextBox Text="{Binding Value.MaxReactionTime}"/>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                    <GridViewColumn Header="Correct Answers">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="auto"/>
                                        <ColumnDefinition Width="*"/>
                                    </Grid.ColumnDefinitions>
                                    <ListView 
                                        ItemsSource="{Binding Value.Answers, Mode=TwoWay}" 
                                        Grid.Column="0">
                                        <ListView.ItemTemplate>
                                            <DataTemplate>
                                                <Grid>
                                                    <Grid.ColumnDefinitions>
                                                        <ColumnDefinition Width="150"/>
                                                        <ColumnDefinition Width="150"/>
                                                        <ColumnDefinition Width="25"/>
                                                    </Grid.ColumnDefinitions>
                                                    <ComboBox 
                                                        Grid.Column="0" 
                                                        SelectedIndex="{Binding AnswerType}" 
                                                        Margin="5,0,5,0">
                                                        <ComboBoxItem Content="{x:Static localization:Resources.ScriptsLabel}"/>
                                                        <ComboBoxItem Content="{x:Static localization:Resources.AllObjectionsLabel}"/>
                                                        <ComboBoxItem Content="{x:Static localization:Resources.QuickAnswersLabel}"/>
                                                    </ComboBox>
                                                    <TextBox 
                                                        Grid.Column="1" 
                                                        Text="{Binding CorrectAnswer}"/>
                                                    <Button 
                                                        Grid.Column="2" 
                                                        HorizontalAlignment="Center"
                                                        Width="20" 
                                                        Height="20" 
                                                        Margin="5,0,0,0"
                                                        cal:Message.Attach="DeleteItem($dataContext)">
                                                        <Button.Content>
                                                            <Image Source="/Resources/delete.ico"/>
                                                        </Button.Content>
                                                    </Button>
                                                </Grid>
                                            </DataTemplate>
                                        </ListView.ItemTemplate>
                                    </ListView>
                                    <Button 
                                        VerticalAlignment="Bottom" 
                                        Width="20" Height="20" 
                                        Grid.Column="1" 
                                        Margin="5,0,0,2"
                                        cal:Message.Attach="AddItem()">
                                        <Button.Content>
                                            <Image Source="/Resources/add.ico"/>
                                        </Button.Content>
                                    </Button>
                                </Grid>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>
        <Button 
            Content="{x:Static localization:Resources.SettingsSaveButtonContent}" 
            Margin="10,0,10,10" 
            Grid.Row="2" 
            Grid.Column="1"
            cal:Message.Attach="Save()"/>
        <Button 
            Content="{x:Static localization:Resources.CancelButtonContent}" 
            Margin="10,0,10,10" 
            Grid.Row="2"  
            Grid.Column="0"
            cal:Message.Attach="Cancel()"/>
    </Grid>
</UserControl>

Answer 1

自从我使用caliburn micro以来已经有一段时间了，所以请带些盐：）

ObservableDictionary<string, TestCaseConfig>

仅直接在字典上侦听更改，这意味着在字典中添加或删除项目时。对于您而言，您不需要这样做，而是在字典中已有的项目中进行更改。

所以，您需要更改您的

public List<Answer> Answers { get; set; }

列出了可以观察到的列表，例如ObservableList<Anwer>（或类似的名称-不记得Caliburn.Micro术语）。

听写更改后，Caliburn.Micro不会更新ListView

1 个答案: