Concatenate string properties of an object with lambda

Question

Please consider the following:

public class MyObject
{
   public bool B;
   public string Txt;
}

List<MyObject> list; //list of a bunch of MyObject's 

With lambda expression, how can I produce a string consisting of comma separated values of Txt of those objects, where B is true?

Thank you.

Solution 1

for .net 3.5:

string.Join(",", list.Where(o => o.B).Select(o => o.Txt).ToArray())

for .net 4.0:

string.Join(",", list.Where(o => o.B).Select(o => o.Txt))

Solution 2

string myString = string.Join(",", list.Where(x => x.B).Select(x=>x.Txt));

Comments

[B Bulfin]

with .net 4, you don't need .ToArray().

[Luis Tellez]

I need this but for visual Basic .net

[Diego]

@Luis String.Join(",", list.Where(Function(x) x.B).Select(Function(x) x.Txt))