ConcurrentDictionary AddOrUpdate列表

Question

我正在尝试使用ConcurrentDictionary来帮助完成过滤任务.

如果列表中出现一个数字,那么我想将一个条目从一个字典复制到另一个字典.

但这部分AddOrUpdate不对 - v.Add(number)

我明白了

"无法将类型'void'隐式转换为'System.Collections.Generic.List'

还有两个错误.

class Program
{
    static void Main(string[] args)
    {
        Program p = new Program();
        List<int> filter = new List<int> {1,2};
        p.Filter(filter);
    }


    private void Filter(List<int> filter)
    {
        Dictionary<string, List<int>> unfilteredResults = new Dictionary<string, List<int>>();
        unfilteredResults.Add("key1", new List<int> { 1,2,3,4,5});

        ConcurrentDictionary<string, List<int>> filteredResults = new ConcurrentDictionary<string, List<int>>();

        foreach (KeyValuePair<string, List<int>> unfilteredResult in unfilteredResults)
        {
            foreach (int number in unfilteredResult.Value)
            {
                if (filter.Contains(number))
                {
                    filteredResults.AddOrUpdate(unfilteredResult.Key, new List<int> { number }, (k, v) => v.Add(number));
                }
            }
        }
    }
}

Answer 1

感谢Lucas Trzesniewski在评论中指出我的错误 - 他不想发表回答.

你可能的意思是:(k,v)=> {v.Add(number); 返回v; }