C# 绑定到viewmodel不起作用

我有一个名为

ChannelControls

的用户控件，它在另一个名为CMiX的控件中实例化了6次。我想将一个

ChannelControls

属性绑定到一个名为cmixdata的单例类

datacontext是在XAML中设置的：

<UserControl
        x:Class="CMiX.CMiX_UI"
        DataContext="{x:Static CMiX:CMiXData.Instance}"

ChannelControls

名为

ChannelSpriteCount

的属性绑定到

cmixdata

类，其定义如下：

[Serializable]
public class CMiXData : DependencyObject, INotifyPropertyChanged
{
    private static CMiXData _instance = null;
    public static CMiXData Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = new CMiXData();
            }
            return _instance;
        }
    }
    private CMiXData() { } //prevent instantiation from outside the class


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

    private ObservableCollection<ChannelData> _ChData = new ObservableCollection<ChannelData>(new ChannelData[] { new ChannelData { SpriteCount = "1" }, new ChannelData { SpriteCount = "1" }, new ChannelData { SpriteCount = "1" }, new ChannelData { SpriteCount = "1" }, new ChannelData { SpriteCount = "1" }, new ChannelData { SpriteCount = "1" } });
    public ObservableCollection<ChannelData> ChData
    {
        get { return _ChData; }
        set
        {
            if (_ChData != value)
            {
                _ChData = value;
                RaisePropertyChanged("ChData");
            }
        }
    }

尽管所有类都实现INotifyPropertyChange，但当

ChannelSpriteCount

更改时，绑定不会在cmixdata中更新，它仍然是构造函数中设置的默认值…

尝试以这种方式绑定

"{Binding Source={x:Static CMiXData.Instance}, Mode=TwoWay, Path=ChData[0].SpriteCount}"

---

UPD:正如@lecloneur所建议的那样，

Mode=TwoWay

是它工作所必需的。

请不要忘记提及当前DataContext已设置为

CMiXData.Instance

。您是否也在ChannelControl的XAML中的绑定上设置了

Mode=TwoWay

？尝试将依赖项属性声明为SpriteCountProperty=DependencyProperty.Register（“ChannelSpriteCount”、typeof（string）、typeof（ChannelControls）、new FrameworkPropertyMetadata（null，FrameworkPropertyMetadata Options.AffectsRender，OnPriteCallChanged））；然后看看它是否会在一个月内发生变化。幸运的是，它不起作用。singleton类未更新为新值。ChData[0]。SpriteCount不会触发其属性已更改。

public class ChannelData : INotifyPropertyChanged
{
    public ChannelData() { }

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

    private string _SpriteCount;
    public string SpriteCount
    {
        get { return _SpriteCount; }
        set
        {
            if (_SpriteCount != value)
            {
                _SpriteCount = value;
                RaisePropertyChanged("SpriteCount");
            }
        }
    }

"{Binding Source={x:Static CMiXData.Instance}, Mode=TwoWay, Path=ChData[0].SpriteCount}"