C#合并两个Dictionary的方法

绝代码农

直接代码：

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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第二种：

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       //相对于第一种只是修改了遍历的方法
 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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