How to Search a String in List> in C#

Question

I am having a

        List<Tuple<string,string>> tr = new List<Tuple<string,string>>();
        tr.Add(new Tuple<string, string>("Test","Add");
        tr.Add(new Tuple<string, string>("Welcome","Update");

        foreach (var lst in tr)
         {
             if(lst.Contains("Test"))
              MessageBox.Show("Value Avail");

          }

I failed while doing this ,....

Your code posted here has a lot of compilation errors. Missing ')' and lst obviously does not contain a definition for Contains. You should post code which can compile and then shows your problem. Konstantin's answer below solves your issue. — Ravi Y, Jan 03 '13 at 06:42

score 16 · Answer 1 · answered Jan 03 '13 at 06:50

If you'd like to use LINQ:

if(tr.Any(t => t.Item1 == "Test" || t.Item2 == "Test"))
    MessageBox.Show("Value Avail");

This will also have the benefit of only showing the message box once if the text is found multiple times (if that is what is desired).

horgh · Accepted Answer · 2013-01-03T06:59:55.087

10

Probably this should work:

foreach (var lst in tr)
{        
    if (lst.Item1.Equals("Test"))        
        MessageBox.Show("Value Avail");
}

or this

if (lst.Item1.Equals("Test") || lst.Item2.Equals("Test"))

Read Tuple Class; you'll need to access values of the tuple through Item1 and/or Item2 properties.

And why use Tuple at all? Maybe this is easier:

Dictionary<string, string> dict = new Dictionary<string, string>
{
    {"Test", "Add"},
    {"Welcome", "Update"}
};

if (dict.ContainsKey("Test"))
{
    MessageBox.Show("Value Avail:\t"+dict["Test"]);
}

edited Jan 03 '13 at 06:59

answered Jan 03 '13 at 06:38

horgh

17,918
22
68
123

Applies to `List<(string A, string B)>` ? – Kiquenet Nov 22 '22 at 07:49

score 2 · Answer 3 · answered Jul 20 '16 at 04:25

List<Tuple<string,string>> tr = new List<Tuple<string,string>>();
tr.Add(new Tuple<string, string>("Test","Add");
tr.Add(new Tuple<string, string>("Welcome","Update");
var index = tr.FindIndex(s=>s.Item1 == "Test" || s.Item2 == "Test");
if(index != -1)
MessageBox.Show("Value Avail");

Using FindIndex, you can check the availability and index of element at the same time.

score 1 · Answer 4 · answered Jan 03 '13 at 06:38

1

it should be foreach (var lst in tr) not lstEvntType and you should test for the tuple's Item1 field instead.

answered Jan 03 '13 at 06:38

Ameen

2,576
1
14
17

score 1 · Answer 5 · edited May 23 '17 at 12:26

1

Maybe this might help someone else. Here is the method I went with:

List<Tuple<string,string>> tr = new List<Tuple<string,string>>();
tr.Add(new Tuple<string, string>("Test","Add");
tr.Add(new Tuple<string, string>("Welcome","Update");

if(lst.Any(c => c.Item1.Contains("Test")))
    MessageBox.Show("Value Avail");

(credit goes here)

edited May 23 '17 at 12:26

Community

1
1

answered Jan 17 '16 at 19:43

SunsetQuest

8,041
2
47
42

score 0 · Answer 6 · answered Jan 03 '13 at 06:41

Why are you iterating over lstEvntType and not tr? You should try this:

List<Tuple<string,string>> tr = new List<Tuple<string,string>>();
tr.Add(new Tuple<string, string>("Test","Add"));
tr.Add(new Tuple<string, string>("Welcome","Update"));
List<Tuple<string,string>>  lstEvntType = new List<Tuple<string,string>>();

    foreach (var lst in tr)
    {
        if(lst.Item1.Equals("Test"))
            MessageBox.Show("Value Avail");
    }

score 0 · Answer 7 · edited May 23 '17 at 10:34

0

Change

if(lst.Contains("Test"))

To

 if(lst.Item1.Contains("Test") ||  lst.Item2.Contains("Test"))

If tuple has more items, you need to add condition for all items.

If you want to make it common for all tuples, you need to use Reflection (and the quirky way).

edited May 23 '17 at 10:34

Community

1
1

answered Jan 03 '13 at 06:48

Tilak

30,108
19
83
131

How to Search a String in List> in C#

7 Answers7