Question

所以我尝试使用以下XAML将TextBlock绑定到ObserverableCollection的Count属性

<TextBlock x:Name="inactiveCount">
    <TextBlock.Text>
        <Binding Path="(sockets:Manager.inactiveCollection.Count)" Mode="OneWay" StringFormat="Inactive: {0}" />
    </TextBlock.Text>
</TextBlock>

但是我在运行程序时收到异常：

Type reference cannot find type named '{clr-namespace:MyProgram.Net.Sockets;assembly=MyProgram}Manager.inactiveCollection'.

绑定到Manager类中的其他属性可以正常工作，而inactiveCollection肯定作为静态属性存在。我究竟做错了什么？

修改

因此，根据fmunkert的建议，我已将其更改为

<TextBlock x:Name="inactiveCount">
    <TextBlock.Text>
        <Binding Path="Count" Source="(sockets:Manager.inactiveCollection)" Mode="OneWay" StringFormat="Inactive: {0}" />
    </TextBlock.Text>
</TextBlock>

它有点工作。它显示错误的计数数字，52当集合中有233个对象在Manager的静态构造函数中初始化时。当对象从集合中删除时，它永远不会更新

修改2

namespace MyProgram.Net.Sockets
{
//technically this is ProxyClientManager but I renamed it here to make the code smaller
    class Manager
    {
        public static ObservableCollection<ProxyClient> inactiveCollection { get; set; }

        static Manager()
        {
            inactiveCollection = new ObservableCollection<ProxyClient>();
            //do stuff to populate inactiveCollection with 233 objects
            //do other stuff like start threads to add/remove objects from the collection
        }
    }
}

Answer 1

使用{x:Static}作为绑定源，例如像这样：

<TextBlock Text="{Binding Path=Count, Source={x:Static sockets:Manager.inactiveCollection}, Mode=OneWay, StringFormat='Inactive: {0}'}"/>

Answer 2

所以fmunkert部分正确，我需要指定一个源，但我还需要在Window.Resources中为该类指定一个StaticResource。以下XAML为我工作：

<Window.Resources>
    <sockets:Manager x:Key="Manager"/>
</Window.Resources>
<TextBlock x:Name="inactiveCount" Text="{Binding Path='inactiveCollection.Count', Source='{StaticResource Manager}', StringFormat='Inactive: {0}'}"/>

.NET 4.5 / WPF - 绑定到静态属性的属性

2 个答案: