在DataGrid SelectedItem中更改属性时，DataTrigger不会触发

Question

当我在DataGrid上更新SelectedItem的属性时，我试图触发数据触发器。有人能告诉我我需要改变什么才能让它发挥作用吗？

当用户选择网格中的项目时，其Connected属性将设置为true。我在DataGrid中的标签应该从红色变为绿色。它保持红色。

我知道这种风格是有效的，因为如果我开始将属性Connected设置为true，它们都会变成绿色。当用户在DataGrid中选择一个项时，它似乎不会触发。

// Style set in Resources of my control
<Style x:Key="ConnectedStyle" TargetType="{x:Type Label}" 
BasedOn="{StaticResource FontAwesome}">
    <Setter Property="Foreground" Value="Red" />    // I added this last 
minute thinking it might need to be initialized but still nothing.
    <Style.Triggers>
        <DataTrigger Binding="{Binding Connected}" Value="True">
            <Setter Property="Foreground" Value="Green" />
        </DataTrigger>
        <DataTrigger Binding="{Binding Connected}" Value="False">
            <Setter Property="Foreground" Value="Red" />
        </DataTrigger>
    </Style.Triggers>
</Style>


<DataGrid Grid.Row="1" Grid.Column="1"
    ItemsSource="{Binding AvailablePorts}"
    SelectedItem="{Binding SelectedPort}"
    HorizontalAlignment="Stretch"
    SelectionMode="Single"
    Style="{StaticResource PlainGrid}"
    AutoGenerateColumns="False" ColumnHeaderHeight="30">
    <DataGrid.Columns>
        <DataGridTemplateColumn Header=" Status" Width="55">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Label Style="{StaticResource ConnectedStyle}" 
                     Content="&#xf111;" FontSize="12" Margin="5,0,0,0"
                     Padding="0" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTemplateColumn Header=" Port" Width="*">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Port}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

查看模型

public class EMSViewModel : ViewModelDetailBase<EMSViewModel, EMSModel>
{

    public ObservableCollection<AvailablePortsModel> AvailablePorts
    {
        get
        {
            return this.availablePorts;
        }

        private set
        {
            this.availablePorts = value;

            this.NotifyPropertyChanged(m => m.AvailablePorts);
        }
    }

    public AvailablePortsModel SelectedPort
    {
        get
        {
            return this.selectedPort;
        }

        set
        {
            this.selectedPort = value;

            this.NotifyPropertyChanged(m => m.SelectedPort);

            this.ConnectToPort();
        }
    }

    private void ConnectToPort()
    {
        // if the code (removed) evaluates to true, set the connected property to true.

        this.SelectedPort.Connected = true;

        this.NotifyPropertyChanged(m => m.AvailablePorts);
    }
}

模型

namespace FastV.Models
{
    using SimpleMvvmToolkit;
    public class AvailablePortsModel : ModelBase<AvailablePortsModel>
    {
        private bool connected;

        private string port;

        public bool Connected
        {
            get
            {
                return this.connected;
            }

            set
            {
                this.connected = value;

                this.NotifyPropertyChanged(m => m.Connected);
            }
        }

        public string Port
        {
            get
            {
                return this.port;
            }

            set
            {
                this.port = value;

                this.NotifyPropertyChanged(m => m.Port);
            }
        }
    }
}