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C# / .NET - replace part of string from given index

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Created by:

Zeeshan-Peel

850

In this article, we would like to show you how to replace part of string from given index in C#.

Quick solution:

xxxxxxxxxx
 
string text = "ABCD";
string replacement = "xy";
​
int position = 1;
int numberOfCharacters = 2;
​
string result = text.Remove(position, numberOfCharacters).Insert(position, replacement);
​
Console.WriteLine(result); // Output: AxyD

Practical example

Edit

In this example, we use Remove() and Insert() methods to replace part of string from given position (index).

xxxxxxxxxx
 
using System;
​
public class TestClass
{
    public static void Main()
    {
        string text = "ABCD";
        string replacement = "xy";
​
        int position = 1;            // start at index 1
        int numberOfCharacters = 2;  // number of characters to replace
​
        string result = text.Remove(position, numberOfCharacters).Insert(position, replacement);
​
        Console.WriteLine(result); // Output: AxyD
    }
}

Output:

xxxxxxxxxx
 
AxyD

Alternative solution using StringBuilder

Edit

In this example, we present how to replace part of string from given index using StringBuilder.

xxxxxxxxxx
 
using System;
using System.Text;
​
public class TestClass
{
    public static void Main()
    {
        string text = "ABCD";
        string replacement = "xy";
​
        int position = 1;            // start at index 1
        int numberOfCharacters = 2;  // number of characters to replace
​
        var stringBuilder = new StringBuilder(text);
​
        stringBuilder.Remove(position, numberOfCharacters);
        stringBuilder.Insert(position, replacement);
​
        text = stringBuilder.ToString();
​
        Console.WriteLine(text);
    }
}