C# 点击标签各自的父项（listview的项）后，如何更改标签的文本颜色？

我有一个使用ItemTemplate的ListView。我想在点击项目时更改相应的标签文本颜色

我的代码的相关部分：

public class Especialidade
{
            public string id { get; set; }
            public string especialidade { get; set; }
            public Color color { get; set; }
}

public List<Especialidade> ListaEspecs;

应更改颜色的代码（颜色应自动绑定）

Xaml

<ListView x:Name="ListViewEspecs" ItemTapped="ListViewEspecs_ItemTapped" Grid.Column="0" Grid.Row="1" SelectionMode="None" BackgroundColor="Transparent" SeparatorVisibility="None" HorizontalOptions="FillAndExpand" VerticalOptions="StartAndExpand" VerticalScrollBarVisibility="Never" SeparatorColor="Transparent">
    <ListView.ItemTemplate>
         <DataTemplate>
             <ViewCell>
                <Grid Margin="0,0,0,5"> 
                     <Grid.RowDefinitions>
                          <RowDefinition Height="40" />
                     </Grid.RowDefinitions>

                     <Label Text="{Binding especialidade}" Grid.Column="1" Grid.Row="0" FontSize="16" HorizontalTextAlignment="Start" HorizontalOptions="StartAndExpand" VerticalOptions="CenterAndExpand" TextColor="{Binding color}" />
                </Grid> 
             </ViewCell> 
          </DataTemplate> 
      </ListView.ItemTemplate>
</ListView>

---

标签文本按预期绑定，但当我点击该项时，应用程序会毫无例外地冻结。我该怎么做？

同意@Jason您需要在模型中实现接口INotifyPropertyChanged

public class Especialidade : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    public string id { get; set; }
    public string especialidade { get; set; }

    Color _color;
    public Color color
    {
        get { return _color; }

        set {

             if(_color!=value)
            {
                _color = value;
                NotifyPropertyChanged("color");
            }

        }
    }

}

---

此外，由于您使用了MVVM，因此最好将所有逻辑处理放在ViewModel中。

尤其是数据需要实现INotifyPropertyChanged@Jason你能回答这个问题吗？我会将它标记为正确的，因为它解决了问题。@Jason客户将绑定设置为颜色。

<ListView x:Name="ListViewEspecs" ItemTapped="ListViewEspecs_ItemTapped" Grid.Column="0" Grid.Row="1" SelectionMode="None" BackgroundColor="Transparent" SeparatorVisibility="None" HorizontalOptions="FillAndExpand" VerticalOptions="StartAndExpand" VerticalScrollBarVisibility="Never" SeparatorColor="Transparent">
    <ListView.ItemTemplate>
         <DataTemplate>
             <ViewCell>
                <Grid Margin="0,0,0,5"> 
                     <Grid.RowDefinitions>
                          <RowDefinition Height="40" />
                     </Grid.RowDefinitions>

                     <Label Text="{Binding especialidade}" Grid.Column="1" Grid.Row="0" FontSize="16" HorizontalTextAlignment="Start" HorizontalOptions="StartAndExpand" VerticalOptions="CenterAndExpand" TextColor="{Binding color}" />
                </Grid> 
             </ViewCell> 
          </DataTemplate> 
      </ListView.ItemTemplate>
</ListView>

public class Especialidade : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    public string id { get; set; }
    public string especialidade { get; set; }

    Color _color;
    public Color color
    {
        get { return _color; }

        set {

             if(_color!=value)
            {
                _color = value;
                NotifyPropertyChanged("color");
            }

        }
    }

}