Member Avatar for Saanvi

Is there a function in c# that returns x times of given char or string. Or I must code it?

Thank you
Saanvi sharma

Edited by Reverend Jim because: stripped link
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The original question from can be read two ways: either "create a new string that repeats a given char/string N times" or "count how many times a char/string appears inside another string." Several replies (notably and ) provide counting-style solutions; pointed to external Q&A. The snippets below assume the intent is to produce a repeated value; a short counting alternative is shown after.

For repeating values in C#:

// repeat a single char (built-in)
string fiveXs = new string('x', 5); // "xxxxx"

// repeat an arbitrary string (compact)
using System.Linq;
string RepeatString(string s, int count)
{
    if (s == null) throw new ArgumentNullException(nameof(s));
    if (count <= 0) return string.Empty;
    return string.Concat(Enumerable.Repeat(s, count));
}

// repeat an arbitrary string efficiently for large sizes
using System.Text;
string RepeatWithBuilder(string s, int count)
{
    if (s == null) throw new ArgumentNullException(nameof(s));
    if (count <= 0 || s.Length == 0) return string.Empty;
    var sb = new StringBuilder(s.Length * count);
    for (int i = 0; i < count; i++) sb.Append(s);
    return sb.ToString();
}

Notes and a small counting tip: use new string(char, count) for single-char repetition (fast and allocation-efficient). For repeating a multi-character string, string.Concat(Enumerable.Repeat(...)) is concise; switch to StringBuilder with a pre-sized capacity when count or the fragment length is large to avoid extra allocations. Always validate count (negative should usually throw or be treated as zero) and treat null/empty inputs explicitly. If the intent was counting occurrences (as in and ), a concise char-count is int occ = input.Count(c => c == 'a'); (LINQ).

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Member Avatar for pty

Unfortunately there's not a function that drives traffic to your crappy website either!

Member Avatar for Begginnerdev

Below you will find a very brute force way or measuring this:

   Private Function CountChar(ByVal c As Char, ByVal sSource As String, ByVal bCaseSensitive As Boolean) As Integer
    Try
        If Not bCaseSensitive Then
            sSource = sSource.ToLower
            c = Char.ToLower(c)
        End If
        Dim istart As Integer = InStr(sSource, c)
        Dim istop As Integer = InStrRev(sSource, c)
        Dim count As Integer = 0

        For i = istart To istop
            'add 1 for index
            If sSource.Contains(c) Then count += 1
            If sSource(i) = c Then
                count += 1
            End If
        Next

        Return count
    Catch ex As Exception
        MsgBox(ex.Message, MsgBoxStyle.Critical, "Error!")
        Return 0
    End Try
End Function

You will call the code like so:

iCount = CountChar("a"c, sMyString, True)

This will return the number of lower case a's in the string sMyString.

Member Avatar for Begginnerdev

Below you will find a very brute force way or measuring this:

      int CountChars(char cChar, string sString, bool bCaseSensitive)
    {
        if (!bCaseSensitive)
        {
            cChar = Char.ToLower(cChar);
            sString = sString.ToLower();
        }

        if (sString.IndexOf(cChar) == -1)
        {
            return 0;
        }
        else
        {
            int i;
            int iCount = 0;
            int iStart = sString.IndexOf(cChar);

            for (i = iStart; iStart == sString.Length - 1; iStart++)
            {
                if (sString[i] == cChar)
                {
                    iCount++;
                }
            }
            return iCount;
        }   
    }

You can chose to tell the function to check for case sensitivity or not.

EDIT Once I posted this code, I saw it was the C# forum. I have fixed the code.

Member Avatar for xrjf

searchStringA.PNG searchStringB.PNG
The function you're asking for may well be Regex's class:

Imports System.Text.RegularExpressions

Public Class SearchCharOrString
    Private Sub btnGo_Click(sender As Object, e As EventArgs) Handles btnGo.Click
        Try
            Dim cnt As Int32 = countCharOrString(
                tbSearch.Text, tbIn.Text, chkSens.Checked)
            lblCount.Text = "Count: " + cnt.ToString
        Catch ex As Exception

        End Try
    End Sub
    Function countCharOrString(search As String, inString As String, bCaseSensitive As Boolean)

        Dim re As Regex = Nothing
        If bCaseSensitive Then
            re = New Regex(Regex.Escape(search))
        Else
            re = New Regex(Regex.Escape(search), RegexOptions.IgnoreCase)
        End If
        Dim count As Int32 = re.Matches(inString).Count
        Return count
    End Function
Edited by xrjf
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