实现简单向量空间模型VSM进行文本相似度计算

public class TestSimilar
    { 
     public  double Similarity(string text1, string text2)
        {
            double similarity = 0.0, numerator = 0.0, denominator1 = 0.0, denominator2 = 0.0;
            int temp1, temp2;
            Dictionary<string, int> dictionary1 = GetDictionary(text1);
            Dictionary<string, int> dictionary2 = GetDictionary(text2);
            if ((dictionary1.Count < 1) || (dictionary2.Count < 1))//如果任一篇文章中不含有汉字
            {
                return 0.0;
            }
            Dictionary<string, int>.KeyCollection keys1 = dictionary1.Keys;
            foreach (string key in keys1)
            {
                dictionary1.TryGetValue(key, out temp1);
                if (!dictionary2.TryGetValue(key, out temp2))
                {
                    temp2 = 0;
                }
                dictionary2.Remove(key);
                numerator += temp1 * temp2;
                denominator1 += temp1 * temp1;
                denominator2 += temp2 * temp2;
            }
            Dictionary<string, int>.KeyCollection keys2 = dictionary2.Keys;
            foreach (string key in keys2)
            {
                dictionary2.TryGetValue(key, out temp2);
                denominator2 += temp2 * temp2;