How can I update the contents of a list with data from another list?

Question

I have a list of two properties named Kanjis :

and I would like to use that to update the contents of another list named PhraseSources

public class PhraseSource
{
    [PrimaryKey]
    public string Id { get; set; }
    public int PhraseNum { get; set; }
    public string English { get; set; }
    public string Kanji { get; set; }
    public string WordType { get; set; }
    public string FrequencyA { get; set; }
}

by matching together Kanji > Text and updating FrequencyA with Code

Is this something that can be done with LINQ or is there a better to way to do this by iterating through each of the rows of the phraseSource, checking for a matching entry in Kanjis and doing an update that way?

Here's the code suggested by Salva that I tried:

(from sa in source
         join d in psDb on sa.Text equals d.Kanji
         let temp = d.FrequencyA = sa.Code
         select 0).ToList();

gives error:

ApplyFrequency.cs(14,14): Error CS1941: The type of one of the expressions in the join clause is incorrect. Type inference failed in the call to 'Join'. (CS1941) (Download)

 source.Join(psDb, s => s.Text, d => d.Kanji, (s, d) => d.FrequencyA = s.Code).ToList();

gives error:

ApplyFrequency.cs(21,21): Error CS0411: The type arguments for method 'Enumerable.Join(IEnumerable, IEnumerable, Func, Func, Func)' cannot be inferred from the usage. Try specifying the type arguments explicitly. (CS0411) (Download)

Notes:

I had to use this code as I was asked to change FrequencyA to an int:

var source = original
                    .Select(x => new 
                    {
                        Text = x.Text,
                        Code = Convert.ToInt32(x.Code.Substring(2))
                    })
                    .ToList();

Answer 1

You can update list through LINQ only. The closest you could get is:

static void Main(string[] args)
{
  List<SomeClass> scl = new List<SomeClass>();
  List<OtherClass> ocl = new List<OtherClass>();

  foreach (var item in scl)
    item.FrequencyA = ocl.Where(i => i.Text == item.Kanji).FirstOrDefault()?.Code ?? null;
}

// sample classes that reflect relevant properties
public class SomeClass
{
  public string FrequencyA { get; set; }
  public string Kanji { get; set; }
}

public class OtherClass
{
  public string Code { get; set; }
  public string Text { get; set; }
}

Answer 2

You can do it via single linq query syntax :

var source = new List<TextCodeClass>();
var dest = new List<PhraseSource>();

(from s in source
 join d in dest on s.Text equals d.Kanji 
 let temp = d.FrequencyA = s.Code.ToString()
 select 0).ToList();

or via method syntax :

source.Join(dest, s => s.Text, d => d.Kanji, (s, d) => d.FrequencyA = s.Code.ToString())
      .ToList();