使用WPF将ObservableCollection.Count绑定到标签

问题描述

我有一个简单的标签，它应该包括 .Count $ c> ObservableCollection 。

事情是，结果总是0（零）。

我在这里做错了什么？

这是我的代码：

 < Label ContentStringFormat =Members：{0} > 
< Label.Content> 
< Binding Path =MembersList.CountMode =OneWayUpdateSourceTrigger =Default/> 
< /Label.Content> 
< / Label> 
  

此属性如下所示：

  public static ObservableCollection< Mitglied> MembersList {get;组; } 
  

解决方案

>

MainWindow.Xaml.cs - >

  int Counter = 0; 
 private static ObservableCollection< string> _MemberList = new ObservableCollection< string>（）; 
 //假设它是String类型。我把它作为String类型检查我的case 
 public static ObservableCollection< string> MemberList 
 {
 get {return MainWindow._MemberList; } 
 set {MainWindow._MemberList = value; } 
} 
 
 MainWindow（）
 {
 InitializeComponent（）; 
 MemberList.Add（0）; 
 MemberList.Add（1）; 
 MemberList.Add（2）; 
 Label1.DataContext = this; 
} 
 
 private void Button_Click（object sender，RoutedEventArgs e）
 {
 try 
 {
 MemberList.RemoveAt（Counter）; 
 Counter ++; 
} 
 catch（Exception ex）
 {
 string strTemp = ex.Message（）; 
} 
} 
  

MainWindow.xaml - >

 < Grid> 
< Label Name =Label1ContentStringFormat =Members：{0}Margin =0,56,141,38RenderTransformOrigin =0.158,1.154Horizo​​ntalAlignment =RightWidth =183> 
< Label.Content> 
< Binding Path =MemberList.CountMode =OneWayUpdateSourceTrigger =Default/> 
< /Label.Content> 
< / Label> 
< Button Click =Button_ClickWidth =100Height =20Content =clickMargin =43,169,360,122/> 
< / Grid> 
  

I have a simple Label that should include the bound .Count value of a Property of an ObservableCollection.

The thing is, that the result is always 0 (zero). The same Property is bound to a DataGrid, which works perfectly and even updates if something has changed in the Collection.

What am I doing wrong here?

Here is my code:

<Label ContentStringFormat="Members: {0}">
    <Label.Content>
        <Binding Path="MembersList.Count" Mode="OneWay" UpdateSourceTrigger="Default" />
    </Label.Content>
</Label>

The Property looks like:

public static ObservableCollection<Mitglied> MembersList { get; set; }

解决方案

You can try This...

MainWindow.Xaml.cs->

int Counter = 0;
private static ObservableCollection<string> _MemberList = new ObservableCollection<string>();
// Suppose it is of String type..I took it as of String type to check my case
public static ObservableCollection<string> MemberList
{
    get { return MainWindow._MemberList; }
    set { MainWindow._MemberList = value; }
}

MainWindow()
{
    InitializeComponent();
    MemberList.Add("0");
    MemberList.Add("1");
    MemberList.Add("2");
    Label1.DataContext = this;
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    try
    {
        MemberList.RemoveAt(Counter);
        Counter++;
     }
     catch(Exception ex)
     {
         string strTemp=ex.Message();
     }
 }

MainWindow.xaml->

    <Grid>
        <Label Name="Label1" ContentStringFormat="Members: {0}" Margin="0,56,141,38" RenderTransformOrigin="0.158,1.154" HorizontalAlignment="Right" Width="183">
        <Label.Content>
            <Binding Path="MemberList.Count" Mode="OneWay" UpdateSourceTrigger="Default"/>
        </Label.Content>
    </Label>
        <Button Click="Button_Click" Width="100" Height="20" Content="click" Margin="43,169,360,122" />
    </Grid>

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