通过CustomDictionary访问CustomSubDictionary <tkey，tvalue> <tkey，tvalue> </tkey，tvalue> </tkey，tvalue>

Question

问题

• 如何在BindableDictionary（）中实现代码行“object System.Collections.IList.this [int index] {get {throw new NotImplementedException（）;} set {throw new NotImplementedException（）;}}”为了使下面的代码编译？
• 请继续阅读。

方案

• 我在C＃中有一个自定义BindableDictionary<TKey,TValue>()写入。
• 我使用它绑定到构成DataGrid数据源的BindingSource。
• 因此，当我更新字典时，它会自动更新网格。

问题

• 我有一个场景，我希望有一个字典，其中值是一个自定义对象，该自定义对象包含BindableDictionary作为其属性之一。

  public class MyClass
  {
      public string Name { get; set; }
      public BindableDictionary<string, string> SubDictionary { get; private set; }
      public MyClass(string name)
      {
          Name = name;
          SubDictionary = new BindableDictionary<string, string>();
      }
  }
  

我想如何使用此设置

• 然后我希望能够通过字典访问子字典，并将其绑定到我的BindingSource，如下所示。

演示实施

private BindingSource _bindingSource = new BindingSource();
private BindableDictionary<string, MyClass> myTopLevelDictionary = new BindableDictionary<string, MyClass>();



dataGridView1.DataSource = _bindingSource;

 myTopLevelDictionary.Add("Jim", new MyClass("Jim"));
            myTopLevelDictionary["Jim"].SubDictionary.Add("Height", "180cm");
            myTopLevelDictionary["Jim"].SubDictionary.Add("Weight", "12Stone");
            myTopLevelDictionary.Add("Bob", new MyClass("Bob"));
            myTopLevelDictionary["Bob"].SubDictionary.Add("Height", "170cm");
            myTopLevelDictionary["Bob"].SubDictionary.Add("Weight", "11Stone");

            _bindingSource.DataSource = myTopLevelDictionary["Jim"].SubDictionary;

此行失败

_bindingSource.DataSource = myTopLevelDictionary["Jim"].SubDictionary;

不起作用的原因

• 我不能这样做，因为我还没有在我的BindableDictionary中实现这个功能，而且我对如何做到这一点有点困惑。
• 请有人向我解释我会怎么做？
• 非常感谢。

BindableDictionary代码到目前为止

public class BindableDictionary<TKey, TValue> : IDictionary<TKey, TValue>, IBindingList
    {
        private Dictionary<TKey, TValue> source = new Dictionary<TKey, TValue>();

        void IBindingList.AddIndex(PropertyDescriptor property) { }
        object IBindingList.AddNew() { throw new NotImplementedException(); }
        bool IBindingList.AllowEdit { get { return false; } }
        bool IBindingList.AllowNew { get { return false; } }
        bool IBindingList.AllowRemove { get { return false; } }
        void IBindingList.ApplySort(PropertyDescriptor property, ListSortDirection direction) { }
        int IBindingList.Find(PropertyDescriptor property, object key) { throw new NotImplementedException(); }
        bool IBindingList.IsSorted { get { return false; } }
        void IBindingList.RemoveIndex(PropertyDescriptor property) { }
        void IBindingList.RemoveSort() { }
        ListSortDirection IBindingList.SortDirection { get { return ListSortDirection.Ascending; } }
        PropertyDescriptor IBindingList.SortProperty { get { return null; } }
        bool IBindingList.SupportsChangeNotification { get { return true; } }
        bool IBindingList.SupportsSearching { get { return false; } }
        bool IBindingList.SupportsSorting { get { return false; } }
        int System.Collections.IList.Add(object value) { throw new NotImplementedException(); }
        void System.Collections.IList.Clear() { Clear(); }
        bool System.Collections.IList.Contains(object value) { if (value is TKey) { return source.ContainsKey((TKey)value); } else if (value is TValue) { return source.ContainsValue((TValue)value); } return false; }
        int System.Collections.IList.IndexOf(object value) { return -1; }
        void System.Collections.IList.Insert(int index, object value) { throw new NotImplementedException(); }
        bool System.Collections.IList.IsFixedSize { get { return false; } }
        bool System.Collections.IList.IsReadOnly { get { return true; } }
        void System.Collections.IList.Remove(object value) { if (value is TKey) { Remove((TKey)value); } }
        void System.Collections.IList.RemoveAt(int index) { throw new NotImplementedException(); }
        object System.Collections.IList.this[int index] { get { throw new NotImplementedException(); } set { throw new NotImplementedException(); } }

        private ListChangedEventHandler listChanged;

        event ListChangedEventHandler IBindingList.ListChanged
        {
            add { listChanged += value; }
            remove { listChanged -= value; }
        }

        protected virtual void OnListChanged(ListChangedEventArgs e)
        {
            var evt = listChanged;

            if (evt != null) evt(this, e);
        }

        public void Add(TKey key, TValue value)
        {
            source.Add(key, value);

            OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
        }

        public bool Remove(TKey key)
        {
            if (source.Remove(key))
            {
                OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));

                return true;
            }

            return false;
        }

        public TValue this[TKey key]
        {
            get
            {
                return source[key];
            }
            set
            {
                source[key] = value;

                OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
            }
        }

        void ICollection<KeyValuePair<TKey, TValue>>.Add(KeyValuePair<TKey, TValue> item)
        {
            ((ICollection<KeyValuePair<TKey, TValue>>)source).Add(item);

            OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
        }

        bool ICollection<KeyValuePair<TKey, TValue>>.Remove(KeyValuePair<TKey, TValue> item)
        {
            if (((ICollection<KeyValuePair<TKey, TValue>>)source).Remove(item))
            {
                OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));

                return true;
            }

            return false;
        }

        public bool ContainsKey(TKey key) { return source.ContainsKey(key); }
        public ICollection<TKey> Keys { get { return source.Keys; } }
        public bool TryGetValue(TKey key, out TValue value) { return source.TryGetValue(key, out value); }
        public ICollection<TValue> Values { get { return source.Values; } }
        public void Clear() { source.Clear(); }
        bool ICollection<KeyValuePair<TKey, TValue>>.Contains(KeyValuePair<TKey, TValue> item) { return ((ICollection<KeyValuePair<TKey, TValue>>)source).Contains(item); }
        void ICollection<KeyValuePair<TKey, TValue>>.CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex) { ((ICollection<KeyValuePair<TKey, TValue>>)source).CopyTo(array, arrayIndex); }
        public int Count { get { return source.Count; } }
        bool ICollection<KeyValuePair<TKey, TValue>>.IsReadOnly { get { return ((ICollection<KeyValuePair<TKey, TValue>>)source).IsReadOnly; } }
        public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator() { return source.GetEnumerator(); }
        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return GetEnumerator(); }
        bool ICollection.IsSynchronized { get { return false; } }
        object ICollection.SyncRoot { get { return null; } }
        void ICollection.CopyTo(Array array, int arrayIndex) { ((ICollection)source).CopyTo(array, arrayIndex); } 
    }

Answer 1

您需要实现这些方法，而不是抛出NotImplementedException。由于这些方法来自IBindingList，因此它们需要使字典看起来像列表，因此它们应该返回并获取KeyValuePair对象。或者他们可以返回并获取更适合在网格中显示的其他类型的对象。无论哪种方式，它们都必须实现，并且必须返回有用的对象。

Answer 2

正确执行如下

public class BindableDictionary<TKey, TValue> : IDictionary<TKey, TValue>, IBindingList
    {
        private Dictionary<TKey, TValue> source = new Dictionary<TKey, TValue>();
        private Dictionary<int, TKey> sourceKey = new Dictionary<int, TKey>();

        void IBindingList.AddIndex(PropertyDescriptor property) { }
        object IBindingList.AddNew() { throw new NotImplementedException(); }
        bool IBindingList.AllowEdit { get { return false; } }
        bool IBindingList.AllowNew { get { return false; } }
        bool IBindingList.AllowRemove { get { return false; } }
        void IBindingList.ApplySort(PropertyDescriptor property, ListSortDirection direction) { }
        int IBindingList.Find(PropertyDescriptor property, object key) { throw new NotImplementedException(); }
        bool IBindingList.IsSorted { get { return false; } }
        void IBindingList.RemoveIndex(PropertyDescriptor property) { }
        void IBindingList.RemoveSort() { }
        ListSortDirection IBindingList.SortDirection { get { return ListSortDirection.Ascending; } }
        PropertyDescriptor IBindingList.SortProperty { get { return null; } }
        bool IBindingList.SupportsChangeNotification { get { return true; } }
        bool IBindingList.SupportsSearching { get { return false; } }
        bool IBindingList.SupportsSorting { get { return false; } }
        int System.Collections.IList.Add(object value) { throw new NotImplementedException(); }
        void System.Collections.IList.Clear() { Clear(); }
        bool System.Collections.IList.Contains(object value) { if (value is TKey) { return source.ContainsKey((TKey)value); } else if (value is TValue) { return source.ContainsValue((TValue)value); } return false; }
        int System.Collections.IList.IndexOf(object value) { return -1; }
        void System.Collections.IList.Insert(int index, object value) { throw new NotImplementedException(); }
        bool System.Collections.IList.IsFixedSize { get { return false; } }
        bool System.Collections.IList.IsReadOnly { get { return true; } }
        void System.Collections.IList.Remove(object value) { if (value is TKey) { Remove((TKey)value); } }
        void System.Collections.IList.RemoveAt(int index) { throw new NotImplementedException(); }

        object System.Collections.IList.this[int index]
        {
            get
            {
                return source[sourceKey[index]];
            }
            set { throw new NotImplementedException(); }
        }

        private ListChangedEventHandler listChanged;

        event ListChangedEventHandler IBindingList.ListChanged
        {
            add { listChanged += value; }
            remove { listChanged -= value; }
        }

        protected virtual void OnListChanged(ListChangedEventArgs e)
        {
            var evt = listChanged;

            if (evt != null) evt(this, e);
        }

        public void Add(TKey key, TValue value)
        {
            source.Add(key, value);
            sourceKey.Add(sourceKey.Count, key);
            OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
        }

        public bool Remove(TKey key)
        {
            if (source.Remove(key))
            {
                OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));

                return true;
            }

            return false;
        }

        public TValue this[TKey key]
        {
            get
            {
                return source[key];
            }
            set
            {
                source[key] = value;

                OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
            }
        }

        void ICollection<KeyValuePair<TKey, TValue>>.Add(KeyValuePair<TKey, TValue> item)
        {
            ((ICollection<KeyValuePair<TKey, TValue>>)source).Add(item);

            OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
        }

        bool ICollection<KeyValuePair<TKey, TValue>>.Remove(KeyValuePair<TKey, TValue> item)
        {
            if (((ICollection<KeyValuePair<TKey, TValue>>)source).Remove(item))
            {
                OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));

                return true;
            }

            return false;
        }

        public bool ContainsKey(TKey key) { return source.ContainsKey(key); }
        public ICollection<TKey> Keys { get { return source.Keys; } }
        public bool TryGetValue(TKey key, out TValue value) { return source.TryGetValue(key, out value); }
        public ICollection<TValue> Values { get { return source.Values; } }
        public void Clear() { source.Clear(); }
        bool ICollection<KeyValuePair<TKey, TValue>>.Contains(KeyValuePair<TKey, TValue> item) { return ((ICollection<KeyValuePair<TKey, TValue>>)source).Contains(item); }
        void ICollection<KeyValuePair<TKey, TValue>>.CopyTo(KeyValuePair<TKey, TValue>[] array, int arrayIndex) { ((ICollection<KeyValuePair<TKey, TValue>>)source).CopyTo(array, arrayIndex); }
        public int Count { get { return source.Count; } }
        bool ICollection<KeyValuePair<TKey, TValue>>.IsReadOnly { get { return ((ICollection<KeyValuePair<TKey, TValue>>)source).IsReadOnly; } }
        public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator() { return source.GetEnumerator(); }
        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return GetEnumerator(); }
        bool ICollection.IsSynchronized { get { return false; } }
        object ICollection.SyncRoot { get { return null; } }
        void ICollection.CopyTo(Array array, int arrayIndex) { ((ICollection)source).CopyTo(array, arrayIndex); }
    }