WPF在MVVMLIGHT框架下单击事件无响应

Ada-Wong 2017-05-12 04:50:20

view代码：

[code=text]<Grid Background="{Binding GridColors}">

        <Grid.ColumnDefinitions>

            <ColumnDefinition Width="30"/>

            <ColumnDefinition Width="*"/>

        </Grid.ColumnDefinitions>

        

        <i:Interaction.Triggers>

            <i:EventTrigger EventName="MouseLeftButtonDown">

                <cmd:EventToCommand Command="{Binding MouseDownCommand}"/>

            </i:EventTrigger>

        </i:Interaction.Triggers>

</Grid>

[/code]
view后台代码：

namespace PEIMS.Client.UserControls

{

    /// <summary>

    /// ucSamplePoint.xaml 的交互逻辑

    /// </summary>

    public partial class ucSamplePoint : UserControl

    {

        public ucSamplePoint(SampleEntity sample)

        {

            InitializeComponent();

            this.DataContext = new SamplePointViewModel(sample);

        }

    }

}

viewmodel代码：

public SamplePointViewModel(SampleEntity _sample)

        {

            MouseDownCommand = new RelayCommand(() =>

            {

                if (!_sample.Equals(GlobalVariable.SelectedSample))

                {

                    GlobalVariable.SelectedSample = _sample; ;

                    Messenger.Default.Send<bool>(true, "SelectedChanged");

                }

            });

        }

这个控件会添加多个，作为切换使用，单击这个grid后无任何响应，无法切换

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