C#合并兩個Dictionary的方法

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直接代碼：

 1  public Dictionary<string, string> MergeDictionary(Dictionary<string, string> first, Dictionary<string, string> second) 2         { 3             if (first == null) first = new Dictionary<string, string>(); 4             if (second == null) return first; 5  6             foreach (var item in second) 7             { 8                  if (!first.ContainsKey(item.Key)) 9                      first.Add(item.Key, item.Value);                10             }11 12             return first;13         }

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第二種：

 1  public Dictionary<string, string> MergeDictionary(Dictionary<string, string> first, Dictionary<string, string> second) 2         { 3             if (first == null) first = new Dictionary<string, string>(); 4             if (second == null) return first; 5  6             //相對於第一種只是修改了遍曆的方法 7             foreach (string key in second.Keys) 8             { 9                 if (!first.ContainsKey(key))10                     first.Add(key,second[key]);11             }12             return first;13         }

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C#合并兩個Dictionary的方法