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What are user-defined exceptions in C#?
Like any other programming language, in C#, you can easily create a user-defined exception. User-defined exception classes are derived from the Exception class. Custom exceptions are what we call user-defined exceptions.
In the below example, the exception created is not a built-in exception; it is a custom exception −
TempIsZeroException
You can try to run the following code to learn how to create a user-defined exception in C# −
Example
using System; namespace Demo { class TestTemperature { static void Main(string[] args) { Temperature temp = new Temperature(); try { temp.showTemp(); } catch(TempIsZeroException e) { Console.WriteLine("TempIsZeroException: {0}", e.Message); } Console.ReadKey(); } } } public class TempIsZeroException: Exception { public TempIsZeroException(string message): base(message) { } } public class Temperature { int temperature = 0; public void showTemp() { if(temperature == 0) { throw (new TempIsZeroException("Zero Temperature found")); } else { Console.WriteLine("Temperature: {0}", temperature); } } }
Output
TempIsZeroException: Zero Temperature found
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