Foreach Loop. Distinct

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From: shapper on 21 Jan 2010 20:10

---

Hello,

I have a list of objects: IList<Center> centers. Each Center has two
properties: Place and Name.

I need to create a loops through the distinct Places in all centers
and for each Place displays the centers names.

My problem is how here:

foreach (Place p in centers. ???

Thanks,
Miguel

From: Arne Vajhøj on 21 Jan 2010 20:33

---

On 21-01-2010 20:10, shapper wrote:
> I have a list of objects: IList<Center> centers. Each Center has two
> properties: Place and Name.
>
> I need to create a loops through the distinct Places in all centers
> and for each Place displays the centers names.
>
> My problem is how here:
>
> foreach (Place p in centers. ???

Untested:

foreach (Place p in centers.Select(c => c.Place).Distinct())

Arne

From: Family Tree Mike on 21 Jan 2010 20:55

---

On 1/21/2010 8:33 PM, Arne Vajh�j wrote:
> On 21-01-2010 20:10, shapper wrote:
>> I have a list of objects: IList<Center> centers. Each Center has two
>> properties: Place and Name.
>>
>> I need to create a loops through the distinct Places in all centers
>> and for each Place displays the centers names.
>>
>> My problem is how here:
>>
>> foreach (Place p in centers. ???
>
> Untested:
>
> foreach (Place p in centers.Select(c => c.Place).Distinct())
>
> Arne
>

Just adding to what Arne started: (sorry about the formatting).

List<Center> centers = new List<Center>();
centers.Add(new Center("Tennessee", "Knoxville"));
centers.Add(new Center("Arizona", "Tuscon"));
centers.Add(new Center("New Mexico", "Albuquerque"));
centers.Add(new Center("Arizona", "Phoenix"));

foreach (string UniquePlace in centers.OrderBy(c => c.Place).Select(c =>
c.Place).Distinct())
{
Console.WriteLine(UniquePlace);

foreach (string UniqueCenterInPlace in centers.OrderBy(c =>
c.Name).Where(c => (c.Place == UniquePlace)).Select(c => c.Name))

Console.WriteLine("\t{0}", UniqueCenterInPlace);
}



--
Mike

From: kndg on 21 Jan 2010 21:20

---

On 1/22/2010 9:10 AM, shapper wrote:
> Hello,
>
> I have a list of objects: IList<Center> centers. Each Center has two
> properties: Place and Name.
>
> I need to create a loops through the distinct Places in all centers
> and for each Place displays the centers names.
>
> My problem is how here:
>
> foreach (Place p in centers. ???
>
> Thanks,
> Miguel

I take Mike data as example:

public class Center
{
public string Place { get; private set; }
public string Name { get; private set; }

public Center(string place, string name)
{
Place = place;
Name = name;
}
}

static void Main(string[] args)
{
var centers = new List<Center>();
centers.Add(new Center("Tennessee", "Knoxville"));
centers.Add(new Center("Arizona", "Tuscon"));
centers.Add(new Center("New Mexico", "Albuquerque"));
centers.Add(new Center("Arizona", "Phoenix"));

var query = centers.GroupBy(c => c.Place);

foreach (var g in query)
{
Console.WriteLine(g.Key);

foreach (var n in g)
{
Console.WriteLine("\t{0}", n.Name);
}
}
}


Output:

Tennessee
Knoxville
Arizona
Tuscon
Phoenix
New Mexico
Albuquerque

Regards.

From: shapper on 21 Jan 2010 22:27

---

On Jan 22, 2:20 am, kndg <re...(a)this.newsgroup> wrote:
> On 1/22/2010 9:10 AM, shapper wrote:
>
> > Hello,
>
> > I have a list of objects: IList<Center>  centers. Each Center has two
> > properties: Place and Name.
>
> > I need to create a loops through the distinct Places in all centers
> > and for each Place displays the centers names.
>
> > My problem is how here:
>
> > foreach (Place p in centers. ???
>
> > Thanks,
> > Miguel
>
> I take Mike data as example:
>
> public class Center
> {
>    public string Place { get; private set; }
>    public string Name { get; private set; }
>
>    public Center(string place, string name)
>    {
>      Place = place;
>      Name = name;
>    }
>
> }
>
> static void Main(string[] args)
> {
>    var centers = new List<Center>();
>    centers.Add(new Center("Tennessee", "Knoxville"));
>    centers.Add(new Center("Arizona", "Tuscon"));
>    centers.Add(new Center("New Mexico", "Albuquerque"));
>    centers.Add(new Center("Arizona", "Phoenix"));
>
>    var query = centers.GroupBy(c => c.Place);
>
>    foreach (var g in query)
>    {
>      Console.WriteLine(g.Key);
>
>      foreach (var n in g)
>      {
>        Console.WriteLine("\t{0}", n.Name);
>      }
>    }
>
> }
>
> Output:
>
> Tennessee
>          Knoxville
> Arizona
>          Tuscon
>          Phoenix
> New Mexico
>          Albuquerque
>
> Regards.

Thank You.

That Group approach is really great. I am just using it.

But thank you all. The other approach was good to.

Thanks,
Miguel

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