C# how do I combine string in a group of 3 in for loop

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I have a text file as shown below.

NO: 1
ITEM: Device A
MESSAGE: This item was selected.
NO: 2
ITEM: Device B
MESSAGE: Exception: Could not find the item.

Exception thrown : 
System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

NO: 3
ITEM: Device C
MESSAGE: This item was selected.

In this program, I need to remove the info that not starts with the specific word and
make it in a group of 3. I stuck at here after remove the info that did not start with specific word. I try to use string.Join but I cant get the result that I want.

Final result should look like this:

NO: 1,ITEM: Device A,MESSAGE: This item was selected.
NO: 2,ITEM: Device B,MESSAGE: Exception: Could not find the item.
NO: 3,ITEM: Device C,MESSAGE: This item was selected.

What I have tried:

string[] lines = myInput.Split(new[] { "\n" }, StringSplitOptions.None);
for (int i = 0; i < lines.Count(); i++)
{                   
    if (lines[i].StartsWith("NO:") | lines[i].StartsWith("ITEM:") | lines[i].StartsWith("MESSAGE:"))
         {
             log.Info(lines[i]);             
            //NO: 1
            //ITEM: Device A
            //MESSAGE: This item was selected.
            //...
            //NO: 3
            //ITEM: Device C
            //MESSAGE: This item was selected.
             var r = lines[i].Split(new[] { "" }, StringSplitOptions.None);
             for (int m = 0; m < lines[i].Length; m += 3)
              {
                  var r = string.Join(" ", lines.Skip(m).Take(3));
                  log.Info(r);
              }         
          }
}

I have no idea how to continue with the line[i] and join it together as a group of 3. Please advise.

Posted 19-Jan-22 22:04pm

Member 14771626

Updated 19-Jan-22 22:18pm

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Comments

PIEBALDconsult 20-Jan-22 8:28am

How is this significantly different from
https://www.codeproject.com/Questions/5322721/Csharp-merge-lines-of-strings-into-groups-of-3-at
?

2 solutions

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OriginalGriff · Accepted Answer · 2022-01-19T22:18:00

I'd use a Regex:

C#

Regex reg = new Regex(@"(^NO:.*?\n)(.*?\n)(.*?\n)", RegexOptions.Multiline);
string input = File.ReadAllText(@"D:\Test data\Logging.dat");
MatchCollection matches = reg.Matches(input);
foreach (Match m in matches)
    {
    Console.WriteLine(m.Value.Replace("\r\n", " "));
    }

Richard Deeming · Accepted Answer · 2022-01-19T22:09:00

Try:

C#

string no = null, item = null, message = null;

string[] lines = myInput.Split(new[] { "\n" }, StringSplitOptions.RemoveEmptyEntries);
foreach (string line in lines)
{
    if (line.StartsWith("NO:"))
    {
        if (no != null)
        {
            log.LogInfo($"{no}, {item}, {message}");
            item = null;
            message = null;
        }
        
        no = line;
    }
    else if (line.StartsWith("ITEM:"))
    {
        item = line;
    }
    else if (line.StartsWith("MESSAGE:"))
    {
        message = line;
    }
}

if (no != null)
{
    log.LogInfo($"{no}, {item}, {message}");
}

C# how do I combine string in a group of 3 in for loop

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