Use LINQ to concatenate multiple rows into single row (CSV property)

Question

I\'m looking for the LINQ equivalent to the Sybase\'s LIST() or MySQL\'s group_concat()

It\'ll convert:

User  Hobby
--------------
Bob   Football 
Bo         


        

Answer 1

re the _concat aspect of your question, using:

static class EnumerableExtensions 
{  
    public static String AsJoined( this IEnumerable enumerable )
    {
        return AsJoined( enumerable, "," );
    }

    public static String AsJoined( this IEnumerable enumerable, String separator )
    {
        return String.Join( separator, enumerable.ToArray() );
    }
}

The outputting foreach in bruno conde and Jon Skeet's answers can become:

Console.WriteLine( "User:\tHobbies");
foreach ( var group in groupedUsers )
    Console.WriteLine( "{0}:\t{1}", group.Key, group.Select( g => g.Hobby ).AsJoined( ", " ) );

... and you'll get the precise result output format you asked for (yes, I know the others have already solved your problem, but its hard to resist!)