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  • 构建反转排序的泛型字典类8—实现Dictionary接口

制作者:剑锋冷月 单位:无忧统计网,www.51stat.net
  完整代码下载:http://file.ddvip.com/2008_10/1224750546_ddvip_1916.rar
  8. 实现IDictionary<TKey, TValue>接口
  由于前面实现了IDictionary接口,现在实现IDictionary<TKey, TValue>也就没什么困难的了,照葫芦画瓢。
  首先改变类声明:
public class ReversibleSortedList<TKey, TValue> :IDictionary<TKey, TValue>
  IDictionary, IEnumerable<KeyValuePair<TKey, TValue>>, ICollection,
IEnumerable, ICollection<KeyValuePair<TKey, TValue>>
  然后实现ICollection<KeyValuePair<TKey, TValue>>接口成员:
bool ICollection<KeyValuePair<TKey, TValue>>.IsReadOnly
  {
    get
    {
      return false;
    }
  }
  void ICollection<KeyValuePair<TKey, TValue>>.Add(
    KeyValuePair<TKey, TValue> keyValuePair)
  {
    this.Add(keyValuePair.Key, keyValuePair.Value);
  }
  bool ICollection<KeyValuePair<TKey, TValue>>.Contains(
    KeyValuePair<TKey, TValue> keyValuePair)
  {
    int num1 = this.IndexOfKey(keyValuePair.Key);
    if ((num1 >= 0) && EqualityComparer<TValue>.Default.Equals(this.values[num1],
      keyValuePair.Value))
    {
      return true;
    }
    return false;
  }
  void ICollection<KeyValuePair<TKey, TValue>>.CopyTo(
    KeyValuePair<TKey, TValue>[] array, int arrayIndex)
  {
    if (array == null)
    {
      throw new ArgumentNullException("array");
    }
    if ((arrayIndex < 0) || (arrayIndex > array.Length))
    {
      throw new ArgumentOutOfRangeException(
         "arrayIndex", "Need a non-negative number");
    }
    if ((array.Length - arrayIndex) < this.Count)
    {
      throw new ArgumentException("ArrayPlusOffTooSmall");
    }
    for (int num1 = 0; num1 < this.Count; num1++)
    {
      KeyValuePair<TKey, TValue> pair1;
      pair1 = new KeyValuePair<TKey, TValue>(
            this.keys[num1], this.values[num1]);
      array[arrayIndex + num1] = pair1;
    }
  }
  bool ICollection<KeyValuePair<TKey, TValue>>.Remove(
    KeyValuePair<TKey, TValue> keyValuePair)
  {
    int num1 = this.IndexOfKey(keyValuePair.Key);
    if ((num1 >= 0) && EqualityComparer<TValue>.Default.Equals(
      this.values[num1], keyValuePair.Value))
    {
      this.RemoveAt(num1);
      return true;
    }
    return false;
}
  需要注意,Count属性和Clear方法都是共用方法,不需要再次实现。
  接下来实现IDictionary<TKey, TValue>接口,它是最主要的接口,所有成员均为公有的,前面我们已经实现了Add、ContainsKey方法,这里不再列出:
  ICollection<TKey> IDictionary<TKey, TValue>.Keys
  {
    get
    {
      return this.GetKeyListHelper();
    }
  }
  ICollection<TValue> IDictionary<TKey, TValue>.Values
  {
    get
    {
      return this.GetValueListHelper();
    }
  }
  public TValue this[TKey key] //Item属性,就是索引器
  { 
    get
    {
      TValue local1;
      int num1 = this.IndexOfKey(key);
      if (num1 >= 0)
      {
        return this.values[num1];
      }
      else
      {
        local1 = default(TValue);
        return local1;
      }
    }
    set
    {
      if (key == null)
      {
        throw new ArgumentNullException("key");
      }
      int num1 = Array.BinarySearch<TKey>(this.keys, 0, this._size, key,
        this._sortDirectionComparer);
      if (num1 >= 0)
      {
        this.values[num1] = value;
        this.version++;
      }
      else
      {
        this.Insert(~num1, key, value);
      }
    }
  }
  public bool Remove(TKey key)
  {
    int num1 = this.IndexOfKey(key);
    if (num1 >= 0)
    {
      this.RemoveAt(num1);
    }
    return (num1 >= 0);
  }
  public bool TryGetValue(TKey key, out TValue value)
  {
    int num1 = this.IndexOfKey(key);
    if (num1 >= 0)
    {
      value = this.values[num1];
      return true;
    }
    value = default(TValue);
    return false;
  }
  另外需要添加一个RemoveAt方法:
  //移除指定索引元素
  public void RemoveAt(int index)
  {
    if ((index < 0) || (index >= this._size))
    {
      throw new ArgumentOutOfRangeException("index", "Index out of range");
    }
    this._size--;
    if (index < this._size)
    {
      Array.Copy(this.keys, (int)(index + 1), this.keys, index,
            (int)(this._size - index));
      Array.Copy(this.values, (int)(index + 1), this.values, index,
            (int)(this._size - index));
    }
    this.keys[this._size] = default(TKey);
    this.values[this._size] = default(TValue);
    this.version++;
  }
  最后,进行测试,这一次不再使用int做为键,而改用string:
static void Main()
  {
    ReversibleSortedList<string, string> rs = new ReversibleSortedList<string, string>();
    //添加元素
    rs.Add("3", "a");
    rs.Add("1", "b");
    rs.Add("2", "c");
    rs.Add("6", "d");
    rs.Add("5", "e");
    rs.Add("4", "f");
    //使用DictionaryEntry打印键/值
    foreach (KeyValuePair<string, string> d in rs)
    {
      Console.WriteLine(d.Key + "  " + d.Value);
    }
    Console.WriteLine("删除索引为“2”的“5”的元素");
    rs.Remove("2");
    rs.Remove("5");
    foreach (KeyValuePair<string, string> d in rs)
    {
      Console.WriteLine(d.Key + "  " + d.Value);
    }
}
  ReversibleSortedList 0.7版本:实现IDictionary<TKey, TValue>接口
  运行结果:
1  b
2  c
3  a
4  f
5  e
6  d
  删除索引为“2”的“5”的元素
1  b
3  a
4  f
6  d
  需要注意,Count属性和Clear方法都是共用方法,不需要再次实现。
  接下来实现IDictionary<TKey, TValue>接口,它是最主要的接口,所有成员均为公有的,前面我们已经实现了Add、ContainsKey方法,这里不再列出:
  ICollection<TKey> IDictionary<TKey, TValue>.Keys
  {
    get
    {
      return this.GetKeyListHelper();
    }
  }
  ICollection<TValue> IDictionary<TKey, TValue>.Values
  {
    get
    {
      return this.GetValueListHelper();
    }
  }
  public TValue this[TKey key] //Item属性,就是索引器
  { 
    get
    {
      TValue local1;
      int num1 = this.IndexOfKey(key);
      if (num1 >= 0)
      {
        return this.values[num1];
      }
      else
      {
        local1 = default(TValue);
        return local1;
      }
    }
    set
    {
      if (key == null)
      {
        throw new ArgumentNullException("key");
      }
      int num1 = Array.BinarySearch<TKey>(this.keys, 0, this._size, key,
        this._sortDirectionComparer);
      if (num1 >= 0)
      {
        this.values[num1] = value;
        this.version++;
      }
      else
      {
        this.Insert(~num1, key, value);
      }
    }
  }
  public bool Remove(TKey key)
  {
    int num1 = this.IndexOfKey(key);
    if (num1 >= 0)
    {
      this.RemoveAt(num1);
    }
    return (num1 >= 0);
  }
  public bool TryGetValue(TKey key, out TValue value)
  {
    int num1 = this.IndexOfKey(key);
    if (num1 >= 0)
    {
      value = this.values[num1];
      return true;
    }
    value = default(TValue);
    return false;
  }
 


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