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我的问题在这里:我有一些课

public class Component
{
    ...
    private ServiceController service;

    ...
    public int ServiceStatus
    {
        get
        {
            switch(service.Status)
            {
                case ServiceControllerStatus.Stopped:
                    return 0;

                case ServiceControllerStatus.Running:
                    return 1;

                default:
                    return 2;
            }
        }
    }
    public void QueryService()
    {
        service.Refresh();
    }
}

和组件的集合,在另一个类中声明:

public class Motivation
{
    // Downloaded data
    ...
    private ObservableCollection<Component> components;
    public ObservableCollection<Component> Components
    {
        get { return components; }
    }

    public bool CheckServices()
    {
        bool changed = false;
        foreach (Component C in components)
        {
            int prevStatus = C.ServiceStatus;
            C.QueryService();

            if (prevStatus != C.ServiceStatus)
                changed = true;
        }

        return changed;
    }

此组件列表显示在 WPF DataGrid 中。我的想法:运行服务的绿色背景色,红色 - 停止。工作正常,但仅在开始时。计时器调用 CheckServices(),如果返回值为 True,我想重新渲染我的网格,尊重新的服务状态。这是 XAML:

<Style x:Key="ServiceStateStyle" TargetType="z:DataGridRow">
        <Setter Property="Background" Value="Gray" />
        <Style.Triggers>
            <DataTrigger Binding="{Binding Path=ServiceStatus}" Value="0">
                <Setter Property="Background" Value="LightCoral" />
            </DataTrigger>
            <DataTrigger Binding="{Binding Path=ServiceStatus}" Value="1">
                <Setter Property="Background" Value="LightGreen" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
    <z:DataGrid Grid.Row="0"
                Grid.ColumnSpan="4"
                AutoGenerateColumns="False"
                x:Name="DataGridComponents"
                ItemContainerStyle="{DynamicResource ServiceStateStyle}">
                <z:DataGrid.Columns>
                        <z:DataGridTextColumn IsReadOnly="True"
                            Header="Component" Width="80"
                            Binding="{Binding Path=DisplayName}"/>
                    </z:DataGrid.Columns>
                </z:DataGrid>

我应该调用任何显式方法来使 DataGrid 无效吗?我尝试过使用 InvalidateProperty、InvalidateVisual、GetBindingExpression(ItemContainerStyleProperty).UpdateTarget(),但没有任何效果。任何人都可以帮忙吗?

4

1 回答 1

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Component 类必须实现 INotifyPropertyChanged 并在其某些属性更改时引发事件。

于 2009-12-18T07:44:38.593 回答