How to use C# string IndexOf
The IndexOf method in string Class in C# returns the index of the first occurrence of the specified substring.
int string.IndexOf(string str)
Parameters: - str - The parameter string to check its occurrences.
- Integer - If the parameter String occurred as a substring in the specified String.
it returns position of the first character of the substring .
If it does not occur as a substring, -1 is returned.
Exceptions:- System.ArgumentNullException: If the Argument is null.
example:
- "This is a test".IndexOf("Test") returns 10
- "This is a test".IndexOf("vb") returns -1
using System;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string str = null;
str = "CSharp TOP 10 BOOKS";
MessageBox.Show(str.IndexOf("BOOKS").ToString());
}
}
}
When you execute this C# program you will get the number 14 in the message box. That means the substring "BOOKS" occurred and start in the position 14.
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