WPF 绑定集合 根据集合个数改变样式 INotifyCollectionChanged

 问题：当前ListBox Items 绑定 集合数据源ListA时候；ListA集合数据源中存在另外一个集合ListB，当更改或往ListB集合中添加数据的时候，通知改变？

 

实体类继承 INotifyCollectionChanged 即可实现：

 

BaseViewModel:

public class BaseViewModel : INotifyPropertyChanged, INotifyCollectionChanged, IDisposable
    {
        public event PropertyChangedEventHandler PropertyChanged;
        public event NotifyCollectionChangedEventHandler CollectionChanged;

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

        public virtual void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
        {
            if (CollectionChanged != null)
            {
                CollectionChanged(this, e);
            }
        }

        public void Dispose()
        {
            this.OnDispose();
        }

        protected void OnDispose() { }

        public void OnCollectionChanged()
        {
        }
    }

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