How can I get more than one property from an object list to an array?

Question

Is there a LINQ statemant to transfer a List of a class like

private class ToSelectMany
{
  public string SelectMe1 { get; set; }
  public string SelectMe2 { get; set; }
  public string IgnoreMeString { get; set; }
  public bool IgnoreMeBool { get; set; }
}

to an array like

[0] "list element 1 - SelectMe1"
[1] "list element 1 - SelectMe2"
[2] "list element 2 - SelectMe1"
[3] "list element 2 - SelectMe2"
[4] "list element 3 - SelectMe1"
[5] "list element 3 - SelectMe2"
...

I tried

List<ToSelectMany> elements = GetElements();
string[] elementArray = elements.SelectMany(a => a.ToSelect1, b => b.ToSelect2);

and some similar things, but it won't work.

René Vogt · Accepted Answer · 2016-05-30 10:53:59Z

2

You need to build an array of the two strings foreach element and then use SelectMany to concatinate them:

string[] elementArray = elements.Select(
     (a, i) => new string[] { 
                 "list elment " + (i + 1) + " - " + a.SelectMe1, 
                 "list elment " + (i + 1) + " - " + a.SelectMe2
     }).SelectMany(x => x).ToArray();

or for a better looking c# 6 version:

string[] elementArray = elements.Select(
     (a, i) => new string[] { 
                 $"list elment {i+1} - {a.SelectMe1}", 
                 $"list elment {i+1} - {a.SelectMe2}"
     }).SelectMany(x => x).ToArray();

edited May 30, 2016 at 10:53

answered May 30, 2016 at 10:42

René Vogt

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Comments

Gene R · Accepted Answer · 2016-05-30 10:45:51Z

0

var i = 0;
var list = new List<string>();
elements.ForEach(p=>{
    i++;
    list.Add("list element " + i + " - " + p.SelectMe1);
    list.Add(("list element " + i + " - " + p.SelectMe2);
});

answered May 30, 2016 at 10:45

Gene R

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