单击每个 ListViewItem 的 Button 时修改 TextBlock 值

modify the TextBlock value when click on Button of each ListViewItem

我的 ListView 有以下代码:

 <ListView  x:Name="listme">
 <ListView.ItemTemplate >
   <DataTemplate >
     <Grid>
       ...
      <Button Background="{Binding ButtonColor}"  x:Name="btnStar" 
Click="btnStar_Click" Tag={Binding}>
           <Image/>
          <TextBlock Text="{Binding Path=all_like}" x:Name="liketext" />
      </Button>
     </Grid>
   </DataTemplate >
 </ListView.ItemTemplate >
</ListView >

我有 2 个 ListviewItems,每个都有一个 "BtnStar" Button,每个 Button 都有一个 "liketext" TextBlock,其中一个 TextBlocks 只能工作,例如,当我点击 ListViewItem1 的 btnStar 时,它会修改ListViewItem2的TextBlock的TextBlock值,当我点击ListViewItem1的BtnStar时,我无法修改ListViewItem1的TextBlock的Text,这是我的代码:

 ObservableCollection<Locals> Locals = new ObservableCollection<Locals>();
     public async void getListePerSearch()
    {
        try
        {
            UriString2 = "URL";
            var http = new HttpClient();
            http.MaxResponseContentBufferSize = Int32.MaxValue;
            var response = await http.GetStringAsync(UriString2);
            var rootObject1 = JsonConvert.DeserializeObject<NvBarberry.Models.RootObject>(response);

           foreach (var item in rootObject1.locals)
                {
                    Item listItem = new Item();
                    if (listItem.all_like == null)
                        {
                            listItem.all_like = "0";
                        }

                listme.ItemsSource = Locals;
   }
        private void Button_Click(object sender, RoutedEventArgs e)
                {
                    var btn = sender as Button;
                    var item = btn.Tag as Locals;
                    item.all_like = liketext.Text;
                    liketext.Text = (int.Parse(item.all_like) + 1).ToString();
                    }

Locals.cs:

public class Locals : INotifyPropertyChanged
{
    public int id_local { get; set; }
    public string all_like { get; set; }


    public event PropertyChangedEventHandler PropertyChanged;
    public void NotifyPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this,
                new PropertyChangedEventArgs(propertyName));
        }
    }
}

那么,当我点击每个 ListViewItem 的 BtnStar 按钮时,如何修改 TextBlock 的值 感谢帮助

嗯。首先,您需要在 xaml 个应用程序中使用绑定方法。

您的 class 当地人实施了 INotifyPropertyChanged 但实施不当。 请检查此示例:

public string someProperty {get;set;}
public string SomeProperty 

{

get
 {
   return someProperty;
 }
 set
 {
   someProperty =value;
   NotifyPropertyChanged("SomeProperty");
 }
}

在你的文本块中你有 Text={Binding SomeProperty}

你需要添加 Mode= TwoWay

文本={绑定某些属性,模式=双向}

终于在您的点击方法中 btnStar_Click

你需要做这样的事情:

var btn = sender as Button;
var local= btn.DataContext as Local;
local.SomeProperty= "my new value"

如果您在模型中正确实施了 INotifyPropertyChanged,您将在 UI 中看到更改。

就这些了。

如果对您有用,请标记此答案!

此致。