问题描述
我有一个类映射对象到对象,但不像字典,它映射他们的方式。我现在正试图实现一个定制的IEnumerator接口,通过这些值进行迭代。
public class Mapper< K,T& :IEnumerable< T>,IEnumerator< T>
{
C5.TreeDictionary< K,T& KToTMap = new TreeDictionary< K,T>();
C5.HashDictionary< T,K> TToKMap = new HashDictionary< T,K>();
public void Add(K key,T value)
{
KToTMap.Add(key,value);
TToKMap.Add(value,key);
}
public int Count
{
get {return KToTMap.Count; }
}
public K this [T obj]
{
get
{
return TToKMap [obj];
}
}
public T this [K obj]
{
get
{
return KToTMap [obj];
}
}
public IEnumerator< T> GetEnumerator()
{
return KToTMap.Values.GetEnumerator();
}
public T当前
{
get {throw new NotImplementedException(); }
}
public void Dispose()
{
throw new NotImplementedException();
}
对象System.Collections.IEnumerator.Current
{
get {throw new NotImplementedException(); }
}
public bool MoveNext()
{
;
}
public void Reset()
{
throw new NotImplementedException();
}
}
,不要使你的集合对象实现IEnumerator<>。这导致错误。 (考虑两个线程在同一个集合上迭代的情况)。
正确实现枚举器是非常重要的,因此C#2.0基于'yield return'语句增加了特殊语言支持。
Raymond Chen最近的一系列博客文章(C#中的迭代器及其后果的实现)是加快速度的好地方。
- 第1部分:
- 部分2:
- 第3部分:
- 第4部分:
I have a class that map objects to objects, but unlike dictionary it maps them both ways. I am now trying to implement a custom IEnumerator interface that iterates through the values.
public class Mapper<K,T> : IEnumerable<T>, IEnumerator<T>
{
C5.TreeDictionary<K,T> KToTMap = new TreeDictionary<K,T>();
C5.HashDictionary<T,K> TToKMap = new HashDictionary<T,K>();
public void Add(K key, T value)
{
KToTMap.Add(key, value);
TToKMap.Add(value, key);
}
public int Count
{
get { return KToTMap.Count; }
}
public K this[T obj]
{
get
{
return TToKMap[obj];
}
}
public T this[K obj]
{
get
{
return KToTMap[obj];
}
}
public IEnumerator<T> GetEnumerator()
{
return KToTMap.Values.GetEnumerator();
}
public T Current
{
get { throw new NotImplementedException(); }
}
public void Dispose()
{
throw new NotImplementedException();
}
object System.Collections.IEnumerator.Current
{
get { throw new NotImplementedException(); }
}
public bool MoveNext()
{
;
}
public void Reset()
{
throw new NotImplementedException();
}
}
First, don't make your collection object implement IEnumerator<>. This leads to bugs. (Consider the situation where two threads are iterating over the same collection).
Implementing an enumerator correctly turns out to be non-trivial, so C# 2.0 added special language support for doing it, based on the 'yield return' statement.
Raymond Chen's recent series of blog posts ("The implementation of iterators in C# and its consequences") is a good place to get up to speed.
- Part 1: http://blogs.msdn.com/oldnewthing/archive/2008/08/12/8849519.aspx
- Part 2: http://blogs.msdn.com/oldnewthing/archive/2008/08/13/8854601.aspx
- Part 3: http://blogs.msdn.com/oldnewthing/archive/2008/08/14/8862242.aspx
- Part 4: http://blogs.msdn.com/oldnewthing/archive/2008/08/15/8868267.aspx
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