LINQ 查询以从对象列表中返回不同的字段值

Question

class obj
{
    int typeId; //10 types  0-9 
    string uniqueString; //this is unique
}

Assume there is a list with 100 elements of objs, but only 10 unique typeIDs.

Is it possible to write a LINQ query that returns the 10 unique ints from the list of objs?

Answer 1

class obj
{
    int typeId; //10 types  0-9 
    string uniqueString; //this is unique
}

Assume there is list with 100 elements of obj, but only 10 unique typeIDs.
Is it possible to do write a LINQ query return the 10 unique ints from the list of objs?

Answer 2

class obj
{
    int typeId; //10 types  0-9 
    string uniqueString; //this is unique
}

Assume there is list with 100 elements of obj, but only 10 unique typeIDs.
Is it possible to do write a LINQ query return the 10 unique ints from the list of objs?

Answer 3

class obj
{
    int typeId; //10 types  0-9 
    string uniqueString; //this is unique
}

Assume there is list with 100 elements of obj, but only 10 unique typeIDs.
Is it possible to do write a LINQ query return the 10 unique ints from the list of objs?

Answer 4

class obj
{
    int typeId; //10 types  0-9 
    string uniqueString; //this is unique
}

Assume there is list with 100 elements of obj, but only 10 unique typeIDs.
Is it possible to do write a LINQ query return the 10 unique ints from the list of objs?

Answer 5

class obj
{
    int typeId; //10 types  0-9 
    string uniqueString; //this is unique
}

Assume there is list with 100 elements of obj, but only 10 unique typeIDs.
Is it possible to do write a LINQ query return the 10 unique ints from the list of objs?

Answer 6

class obj
{
    int typeId; //10 types  0-9 
    string uniqueString; //this is unique
}

Assume there is list with 100 elements of obj, but only 10 unique typeIDs.
Is it possible to do write a LINQ query return the 10 unique ints from the list of objs?

Answer 7

class obj
{
    int typeId; //10 types  0-9 
    string uniqueString; //this is unique
}

Assume there is list with 100 elements of obj, but only 10 unique typeIDs.
Is it possible to do write a LINQ query return the 10 unique ints from the list of objs?

Answer 8

If you want to get the distinct objects themselves, use a linq query like this:

List<Person> distinctPersons = allPersons.GroupBy(p => new { p.Email } ).Select(g => g.First()).ToList();