c# example - find a substring in stringbuilder
The following asp.net c# example code demonstrate us how can we find a substring within a StringBuilder object
programmatically at run time in an asp.net application. We can explain the tutorial as 'how can we determine a
StringBuilder object contains a specified substring'.
.Net framework's StringBuilder Class represent a mutable string of characters. StringBuilder Class does not have any method or property to find a substring from it. So, we need to take help from .net framework's String Class. We can convert a StringBuilder object's value to a System.String object by using StringBuilder.ToString() method.
String Class String.Contains() method return a value indicating whether a specified substring occurs within this string. String.Contains() method require to pass a parameter named 'value' which value data type is Sysetm.String and represent the substring to seek/find/search from instance.
String.Contains() method return a Boolean value. It return 'true' if the specified substring occurs (found) within this string or parameter pass an empty string; otherwise it return 'false'.
This is the very simple way to find a substring within the StringBuilder object's sequence of characters.
.Net framework's StringBuilder Class represent a mutable string of characters. StringBuilder Class does not have any method or property to find a substring from it. So, we need to take help from .net framework's String Class. We can convert a StringBuilder object's value to a System.String object by using StringBuilder.ToString() method.
String Class String.Contains() method return a value indicating whether a specified substring occurs within this string. String.Contains() method require to pass a parameter named 'value' which value data type is Sysetm.String and represent the substring to seek/find/search from instance.
String.Contains() method return a Boolean value. It return 'true' if the specified substring occurs (found) within this string or parameter pass an empty string; otherwise it return 'false'.
This is the very simple way to find a substring within the StringBuilder object's sequence of characters.
find-a-substring-in-stringbuilder
<%@ Page Language="C#" AutoEventWireup="true"%>
<%@ Import Namespace="System.IO" %>
<!DOCTYPE html>
<script runat="server">
protected void Button1_Click(object sender, System.EventArgs e)
{
StringBuilder stringb = new StringBuilder();
stringb.Append("Snowy Owl.");
stringb.AppendLine();
stringb.Append("Tawny Owl.");
stringb.AppendLine();
stringb.Append("Jamaican Owl.");
stringb.AppendLine();
//this line find substring in stringbuilder.
Boolean result = stringb.ToString().Contains("Cave Swiftlet");
//this is a technique to find substring in stringbuilder.
Boolean result2 = stringb.ToString().Contains("Tawny Owl");
Label1.Text = stringb.ToString();
Label1.Text += "<br /><br />stringbuilder contains('Cave Swiftlet'): " + result.ToString();
Label1.Text += "<br />stringbuilder contains('Tawny Owl'): " + result2.ToString();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>c# example - find a substring in stringbuilder</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2 style="color:MidnightBlue; font-style:italic;">
c# example - find a substring in stringbuilder
</h2>
<hr width="550" align="left" color="Gainsboro" />
<br />
<asp:Label
ID="Label1"
runat="server"
Font-Size="Large"
>
</asp:Label>
<br /><br /><br />
<asp:Button
ID="Button1"
runat="server"
Text="find a substring in stringbuilder"
OnClick="Button1_Click"
Height="40"
Font-Bold="true"
/>
</div>
</form>
</body>
</html>

- How to append a string to a StringBuilder
- How to append a Tab to a StringBuilder
- How to append a newline to a StringBuilder
- How to use StringBuilder AppendFormat
- How to append another StringBuilder to a StringBuilder
- How to append double quotes in a StringBuilder
- How to get the length of a StringBuilder
- How to write a StringBuilder contents to a file
- How to check if StringBuilder contains a substring
- How to convert a StringBuilder characters to uppercase