How to build a new dictionary with values from two different dictionaries having same keys

问题

Let's say we have two dictionaries with the following key pair values:

Dictionary 1 : [ {1,abc} {2,cde} {3,efg} ]
Dictionary 2: [ {1,123} {2,234} {3,345} ]

I want to create a dictionary as follows: Dictionary 3 : [ {abc,123} {cde,234} {efg,345} ]

    fieldValues = new List<List<string>>();
    docFieldKey = new List<List<string>>();
    docFieldValueDict = new Dictionary<string, List<string>>();
    docKeyDict = new Dictionary<string, List<string>>();
    iterateDocKeyDict = new List<string>();
    iterateDocFldValueDict = new List<string>();

    //To read row wise and store key and all values
    for (limit = 0; limit < docNames.Count; limit++)
    {
        for (row = 0; row < excelData.Count; row++)
        {
            if (excelData[row] == docNames[limit])
            {
                for (colLimit = row + 1; colLimit < fieldNames.Count; colLimit++)
                {
                    flag = true;
                    fieldValues.Add(new List<string>());
                    fieldValues[limit].Add(excelData[colLimit]);
                }
                if (flag == true)
                {
                    docFieldValueDict.Add(docNames[limit], fieldValues[limit]);                          
                }
            }
        }

    }

    //To add concatenated key for each docName
    for (limit = 0; limit < docNames.Count; limit++)
    {
        for (colLimit = 0; colLimit < concatKey.Count; colLimit++)
        {
            if (concatKey[colLimit].Contains(docNames[limit]))
            {
                for (col = colLimit; col < fieldNames.Count - 1; col++)
                {
                    flag = true;
                    docFieldKey.Add(new List<string>());
                    docFieldKey[limit].Add(concatKey[col]);
                }
                if (flag == true)
                {
                    docKeyDict.Add(docNames[limit], docFieldKey[limit]);
                }
            }
        }

    }

    //to merge the key and the value from both dictionaries
    for (limit = 0; limit <docKeyDict.Count; limit++)
    {
        var docKeyDictCompare = docKeyDict.ElementAt(limit);
        var docFldValueDictCompare = docFieldValueDict.ElementAt(limit);
        iterateDocKeyDict = docKeyDictCompare.Value;
        iterateDocFldValueDict = docFldValueDictCompare.Value;
        if (docKeyDictCompare.Key == docFldValueDictCompare.Key)
        {
            for (col = 0; col < fieldNames.Count - 1; col++)
            {
                if ((iterateDocKeyDict.ElementAt(col)!=string.Empty) && (iterateDocFldValueDict.ElementAt(col)!=string.Empty))
                {
                    flag = true;
                }
            }

            if (flag == true)
            {
                keyValuePairDict.Add(iterateDocKeyDict.ElementAt(col), iterateDocFldValueDict.ElementAt(col));
            }
        }
    }

I tried the above but I get index out of range exception at

if ((iterateDocKeyDict.ElementAt(col)!=string.Empty) &&(iterateDocFldValueDict.ElementAt(col)!=string.Empty)) Error msg displayed in Console

回答1:

Just looking at your sample dictionaries I would suggest this:

var dic1 = /* [ {1,abc} {2,cde} {3,efg} ] */;
var dic2 = /* [ {1,123} {2,234} {3,345} ] */;
var dic3 = dic1.ToDictionary(x => x.Value, x => dic2[x.Key]);

But looking at your fairly long code sample I'm not sure it is enough.

回答2:

Try it like this:

var dictionaryC = dictionaryA.ToDictionary(dicA => dicA.Value, dicA => dictionaryB[dicA.Key]);

来源：https://stackoverflow.com/questions/39351583/how-to-build-a-new-dictionary-with-values-from-two-different-dictionaries-having

标签

dictionary

indexoutofrangeexception