Parsing a string into a numeric or other type fails because the format is invalid.
Thrown when the format of an argument does not meet the parameter specifications of the invoked method (most commonly during Int32.Parse or Double.Parse).
Passing non-numeric strings, currency symbols, or whitespace to standard parsing methods.
1using System;2 3public class Program {4 public static void Main() {5 string input = "123.45$";6 int count = int.Parse(input); // Throws System.FormatException7 }8}1using System;2 3public class Program {4 public static void Main() {5 string input = "123.45$";6 7 // Fix: Use Int32.TryParse which returns boolean status rather than throwing exception8 if (int.TryParse(input, out int result)) {9 Console.WriteLine($"Parsed successfully: {result}");10 } else {11 Console.WriteLine($"Invalid numeric format: '{input}'");12 }13 }14}Simulate standard system builds to trigger compiler trace records and track memory crashes locally.
The int.Parse method expects a pure integer format. The trailing symbol '$' and decimal point violate integer formats, causing the parsing operation to throw FormatException.