Get a List<String> from List<Object> in C#

Question

Is there a way to extract the Color type as a list from this List?

    public List<object1> Color1 = new List<object1>() 
    { new object1{Color=(Color)new ColorConverter().ConvertFrom("#FF016864"), Offset=0, Name="Color1"},
      new object1{Color=(Color)new ColorConverter().ConvertFrom("#FF01706B"), Offset=20, Name="Color2"},
      new object1{Color=(Color)new ColorConverter().ConvertFrom("#FF017873"), Offset=40, Name="Color3"},
      new object1{Color=(Color)new ColorConverter().ConvertFrom("#FF018781"), Offset=60, Name="Color4"},
      new object1{Color=(Color)new ColorConverter().ConvertFrom("#FF31A7A3"), Offset=80, Name="Color5"}
    };

i.e. I want this:

public List<string> ColorNames ...

I need the string member of my Color1 List, how can I do this?

@JeppeStigNielsen I renamed my original class to object1 just for the question — Naty Bizz
– Naty Bizz, Commented Nov 25, 2013 at 13:29

Jon Skeet · Accepted Answer · 2013-11-25 13:25:05Z

7

LINQ is your friend:

List<string> names = Color1.Select(x => x.Name).ToList();

Or using List<T>.ConvertAll:

List<string> names = Color1.ConvertAll(x => x.Name);

Personally I prefer using LINQ as it then works for non-lists as well, but ConvertAll is very slightly more efficient as it knows the size of the destination list from the start.

It's worth learning more about LINQ - it's a fabulously useful set of technologies for data transformations. See the MSDN introduction page as a good starting point.

answered Nov 25, 2013 at 13:25

Jon Skeet

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Dmytro Rudenko · Accepted Answer · 2013-11-25 13:25:02Z

0

var result = Color1.Select(x => x.Name).ToList()

Did you mean this list of strings?

answered Nov 25, 2013 at 13:25

Dmytro Rudenko

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Thomas Levesque · Accepted Answer · 2013-11-25 13:25:02Z

0

List<string> ColorNames = Color1.Select(c => c.Name).ToList();

answered Nov 25, 2013 at 13:25

Thomas Levesque

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Jens Kloster · Accepted Answer · 2013-11-25 13:25:11Z

0

try using a select:

public List<string> ColorNames = Color1.Select(c => c.Name).ToList();

answered Nov 25, 2013 at 13:25

Jens Kloster

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