使用GetEnumerator进行字典初始化C＃

Question

I have a class Cluster.cs defined as:

public class Cluster
{
        protected int _clusterID = -1;
        private static int _clusterCount = 0;

        protected int _attributeCount;
        // _clusterObjects contains EvoObjects in this cluster. 
        protected List<EvoObject> _clusterObjects = new List<EvoObject>();

        /** _nkA[_i] is the total occurrences of the attribute _i in this cluster*/
        protected Int32[] _nkA;

        // For each attribute, record their values as KeyValuePair.

        protected Dictionary<Int32, UtilCS.KeyCountMap<Int32>> _attributeValues = new Dictionary<Int32, UtilCS.KeyCountMap<Int32>>();

        public Cluster(int _clusterID, int _attributeCount)
        {
            this._clusterID = _clusterID;
            this._attributeCount = _attributeCount;
            _nkA = new Int32[_attributeCount];
        }

        // Initialize _attributeValues
        IEnumerable<Int32>  _range = Enumerable.Range(0, _attributeCount).GetEnumerator(_i => {_attributeValues[_i] = new UtilCS.KeyCountMap<Int32>()});
}  

while initializing _attributeValues , I got error as:

"No overloaded method for GetEnumerator takes 1 argument"

whereas I've only 1 argument to initialize ie _attributeValues which is actually a dictionary that's why have to enumerate at it.

Also if I declare _attributeCount static, I'm unable to use it in constructor and if I declar it non-static, I'm unable to use it Range method of Enumberable.

How will I initialize _attributeValues then?
How to declare _attributeCount static or non-static?

Answer 1

Enumerable.Range(0, _attributeCount).ToList().ForEach(x => _attributeValues.Add(x, new UtilCS.KeyCountMap<Int32>()));

Answer 2

It looks like your trying to initialize the Dictionary by using a variable (_range) that is set at object creation. This should be moved into the constructor. It appears you are attempting to create three new attributes with keys 0,1,2 and values of new UtilCS.KeyCountMap().

If this is correct, then I would suggest using this as your constructor.

public Cluster(int _clusterID, int _attributeCount)
{
  this._clusterID = _clusterID;
  this._attributeCount = _attributeCount;
  _nkA = new Int32[_attributeCount];

  for (var i = 0; i < 3; i++)
  {
    _attributeValues.Add(i, new UtilCS.KeyCountMap<int>());
  }
}

However, since you are sending in _attributeCount I would say you could use that instead of 3.

public Cluster(int _clusterID, int _attributeCount)
{
  this._clusterID = _clusterID;
  this._attributeCount = _attributeCount;
  _nkA = new Int32[_attributeCount];

  for (var i = 0; i < _attributeCount; i++)
  {
    _attributeValues.Add(i, new UtilCS.KeyCountMap<int>());
  }
}