Entity Framework select distinct name

Question

How can I do this SQL query with Entity Framework?

SELECT DISTINCT NAME FROM TestAddresses

Answer 1

The way that @alliswell showed is completely valid, and there's another way! :)

var result = EFContext.TestAddresses
    .GroupBy(ta => ta.Name)
    .Select(ta => ta.Key);

I hope it'll be useful to someone.

Answer 2

Entity-Framework Select Distinct Name:

Suppose if you are want every first data of particular column of each group ;

 var data = objDb.TableName.GroupBy(dt => dt.ColumnName).Select(dt => new { dt.Key }).ToList();

            foreach (var item in data)
            {
                var data2= objDb.TableName.Where(dt=>dt.ColumnName==item.Key).Select(dt=>new {dt.SelectYourColumn}).Distinct().FirstOrDefault();

               //Eg.
                {
                       ListBox1.Items.Add(data2.ColumnName);                    
                }

            }

Answer 3

Try this:

var results = (from ta in context.TestAddresses
               select ta.Name).Distinct();

This will give you an IEnumerable<string> - you can call .ToList() on it to get a List<string>.

Answer 4

Using lambda expression..

 var result = EFContext.TestAddresses.Select(m => m.Name).Distinct();

Answer 5

Entity-Framework Select Distinct Name:

Suppose if you are using Views in which you are using multiple tables and you want to apply distinct in that case first you have to store value in variable & then you can apply Distinct on that variable like this one....

public List<Item_Img_Sal_VIEW> GetItemDescription(int ItemNo) 
        {
            var Result= db.Item_Img_Sal_VIEW.Where(p => p.ItemID == ItemNo).ToList();
            return Result.Distinct().ToList();
        }

Or you can try this Simple Example

Public Function GetUniqueLocation() As List(Of Integer)
          Return db.LoginUsers.Select(Function(p) p.LocID).Distinct().ToList()
End Function

Answer 6

DBContext.TestAddresses.Select(m => m.NAME).Distinct();

if you have multiple column do like this:

DBContext.TestAddresses.Select(m => new {m.NAME, m.ID}).Distinct();

In this example no duplicate CategoryId and no CategoryName i hope this will help you