CODEWITHSUNDEEP
c#linq
Sin5k4
Sin5k4

Reputation: 1626

Foreach iteration,getting same values in a class

We have objects:

Foo a = new Foo;
a.Prop1 = XX;
a.Prop2 = YY;
a.Prop3 = 12;


Foo b = new Foo;
b.Prop1 = XX;
b.Prop2 = ZZ;
b.Prop3 = 3;

Foo c = new Foo;
c.Prop1 = FF;
c.Prop2 = DD;
c.Prop3 = 3;

And we have a list = List<Foo> MyList= new List<Foo>() And all these objects are added to the list

While iterating through that list:

foreach(Foo _foo in Mylist)
{
   // I want to get the objects whose Prop1 value is
   // the same and add those to another list, what I want
   // to do exactly is actually grouping based on a property.
}

Upvotes: 1

Views: 119

Answers (4)

Daniel Hilgarth
Daniel Hilgarth

Reputation: 174309

You could use GroupBy to achieve this:

var myOtherList = list.GroupBy(x => x.Prop1)
                      .Where(x => x.Count() > 1)
                      .ToList();

myOtherList now contains one group per Prop1 that appears multiple times and all items that have this Prop1.

If you don't care about the groups but only about the items they contain, you can change the query like this:

var myOtherList = list.GroupBy(x => x.Prop1)
                      .Where(x => x.Count() > 1)
                      .SelectMany(x => x)
                      .ToList();

Upvotes: 4

Prash
Prash

Reputation: 1122

If you are free to use LINQ, this would accomplish..

        List<FooClass> originalList = new List<FooClass>(); // your original list containing the objects

        List<FooClass> newList = new List<FooClass>(); // Destination list where you want to keep adding the matching objects

        newList.AddRange(originalList.Where(el => string.Equals(el.Foo, "xx")));

Upvotes: 0

It&#39;sNotALie.
It&#39;sNotALie.

Reputation: 22794

You could do it with LINQ too:

Classlist.Where(x => x == whatever).ToList();

Upvotes: 0

DGibbs
DGibbs

Reputation: 14618

Firstly, when you say classes i think you mean objects or instances of that class. 

List<YourType> types = new List<YourType>();
List<YourType> types2 = new List<YourType>();

foreach(YourType yType in types)
{
    if(yType.Foo == "XX")
    {
       types2.Add(yType);
    }
}

Upvotes: 2

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