Question

有人可以帮助我使用网格列表视图。我想当你点击一个调用函数的元素时，我得到当前项目。我已经有以下XAML代码：

<ListView Name="lstView" ItemsSource="{Binding Path=SimResults}" >
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="SelectionChanged">
            <i:InvokeCommandAction Command="{Binding SelectedItemCommand}" CommandParameter="{Binding SelectedItem, ElementName=lstView}" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
        </Style>
    </ListView.ItemContainerStyle>
    <ListView.View>
        <GridView>
            <GridView.Columns>
                <GridViewColumn Header="FileUniqueID" Width="Auto" DisplayMemberBinding="{Binding Path=FileUniqueID}" />
                <GridViewColumn Header="XML" Width="Auto" DisplayMemberBinding="{Binding Path=XML}" />
                <GridViewColumn Header="Request" Width="Auto" HeaderStringFormat="" DisplayMemberBinding="{Binding Path=RequestShort}" />
                <GridViewColumn Header="RequestDate" Width="Auto" DisplayMemberBinding="{Binding Path=RequestDate}" />
                <GridViewColumn Header="Response" Width="Auto" DisplayMemberBinding="{Binding Path=ResponseShort}" />
                <GridViewColumn Header="ResponseDate" Width="Auto" DisplayMemberBinding="{Binding Path=ResponseDate}" />
                <GridViewColumn Header="ResendCounter" Width="Auto" DisplayMemberBinding="{Binding Path=ResendCounter}" />
            </GridView.Columns>
        </GridView>
    </ListView.View>
</ListView>

在cs文件中，我有以下功能：

private Item selectedItem;
private RelayCommand selectedItemCommand;
this.selectedItemCommand = new RelayCommand(this.SelectedItems);

        public Item SelectedItem
        {
            get { return selectedItem; }
            set { selectedItem = value; OnPropertyChanged("SelectedTrends"); }
        }

        public RelayCommand SelectedItemCommand
        {
            get
            {
                return this.selectedItemCommand;
            }

        }

        private void SelectedItems(object obj)
        {
            this.requestXml = this.selectedItem.DisplayName;
        }

当我选择 selectedItems 元素时，我可以获得该项目。

您好，我测试了上面的代码，它工作正常。但我有问题。我有不同的选项卡，当我单击左键单击其他选项卡时，它始终运行SelectionChanged事件，我得到一个Null引用异常。

Answer 1

请确保在ctor中的InitializeComponent（）之前初始化selectedItemCommand，例如：

public MainWindow()
{
    this.selectedItemCommand = new RelayCommand(this.SelectedItems);

    InitializeComponent();
}

Answer 2

一种解决方案是从listView创建“SelectedItem”的属性。

所以，在你的VM中：

private YourType _selectedResult;
public YourType SelectedResult
{
    get { return _selectedResult; }
    set { _selectedResult= value; OnPropertyChanged("SelectedResult"); }
}

并在ListView上绑定此属性：

<ListView Name="lstView" ItemsSource="{Binding Path=SimResults}" SelectedItem="{Binding SelectedResult}">

C＃ListView中继命令绑定

2 个答案: