C＃从列表创建字典<Dictionary>

Question

I has a list of dictionaries, like:

dic1.Add("A_key1","A_val11"); dic1.Add("B_key1","B_val11")
dic1.Add("C","C"); dic1.Add("D","D");

dic2.Add("A_key1","A_val21");  dic1.Add("B_key1","B_val21");
dic2.Add("C","C");  dic1.Add("D","D");
dic2.Add("A_key2","A_val22");  dic1.Add("B_key2","B_val22");
dic2.Add("A_key3","A_val23");  dic1.Add("B_key3","B_val23");

List<Dictionary<string,string>> tempList = new List<Dictionary<string,string>>{dic1, dic2};

I need to create a Dictionary from tempList follow rule: key = "A_key*" value, val = "B_key*" value from all original Dictionaries in list. Eg, In above example:

expectDic = {("A_val11","B_val11"),
              ("A_val21","A_val21"),
              ("A_val22","A_val22"),
              ("A_val23","A_val23")}

Can I resolve it with Linq?

Answer 1

Your question is unclear so I'm going to make a few assumptions. If these assumptions are incorrect, then let me know and ill modify as appropriate.

Going off your test data, because the keys will be the same, merging the dictionaries will not be possible, hence the list.

Finally, your test data in itself is incorrect as it throws an exception. Thus, I made the assumption that the test data was the following:

        Dictionary<string, string> dic1 = new Dictionary<string, string>();
        Dictionary<string, string> dic2 = new Dictionary<string, string>();

        dic1.Add("A_1", "A_val11");
        dic1.Add("B_1", "B_val11");
        dic1.Add("C", "C");
        dic1.Add("D", "D");


        dic2.Add("A_1", "A_val21");
        dic2.Add("A_2", "A_val22");
        dic2.Add("A_3", "A_val23");
        dic2.Add("B_1", "B_val21");
        dic2.Add("B_2", "B_val22");
        dic2.Add("B_3", "B_val23");
        dic2.Add("C", "C");
        dic2.Add("D", "D");


        List<Dictionary<string, string>> tempList = new List<Dictionary<string, string>> { dic1, dic2 };

Here is some code which will work for the given example:

Dictionary<string, string> expectDic = new Dictionary<string, string>();
        for (int i = 0; i < tempList.Count; i++)
        {
            Dictionary<string, string> onedic = tempList[i];
            while (onedic.Values.ToList().Where(x => x.Contains("A_")).FirstOrDefault() != null)
            {
                expectDic.Add(onedic.Select(x => x.Value).Where(x => x.Contains("A_") && !expectDic.Keys.Contains(x)).First(), onedic.Select(x => x.Value).Where(x => x.Contains("B_") && !expectDic.Values.Contains(x)).First());
                onedic.Remove(onedic.Select(x => x.Key).Where(x => x.Contains("A_")).FirstOrDefault());
                onedic.Remove(onedic.Select(x => x.Key).Where(x => x.Contains("B_")).FirstOrDefault());
            }
        }

However, what you are asking for is very complicated and I would recommend exception handling for the LINQ.