C# Substring Operations
The Substring() method in C# is used to extract parts of a string. You can provide a starting index and an optional length to retrieve a substring.
Key Topics
1. Basic Usage
Example: Extracting Substring from Index
string message = "Hello, World!";
string subMessage = message.Substring(7);
Console.WriteLine(subMessage); // Outputs: World!Output:
World!
2. Substring with Length
Example: Extracting Substring with Start Index and Length
string message = "Hello, World!";
string subMessage = message.Substring(7, 5);
Console.WriteLine(subMessage); // Outputs: WorldOutput:
World
3. Handling Edge Cases
Using invalid indices can cause exceptions.
Example: Avoiding Exceptions
string message = "Hello";
// This will throw an ArgumentOutOfRangeException
string subMessage = message.Substring(10);Explanation: The starting index exceeds the length of the string, resulting in an exception. Always ensure indices are within the valid range.
Key Takeaways
- The
Substring()method extracts parts of a string starting from a specified index. - You can optionally specify the length of the substring to extract.
- Ensure that the starting index and length are within the bounds of the string to prevent exceptions.