C# SystemException

In C#, SystemException is the base class for all exceptions that are defined in the core .NET Framework and provides the basic functionality of an exception. In this tutorial, we'll discuss how to use SystemException in C#.

Syntax

The syntax for using SystemException in C# is as follows:

try {
   // code that may throw an exception
} catch (SystemException e) {
   // code to handle the exception
}

The SystemException class is caught in the catch block, with its reference variable named e.

Example

Let's say we want to create a method that accepts a string argument and throws an exception if the string is null or empty. Here's how we can implement it:

public void ValidateString(string input) {
   if (string.IsNullOrEmpty(input)) {
      throw new SystemException("String is null or empty!");
   }
}

Now, we can call the ValidateString method and handle the SystemException:

try {
   ValidateString(null);
} catch (SystemException e) {
   Console.WriteLine(e.Message); // Output: String is null or empty!
}

Output

When we run the example code above, the output will be:

String is null or empty!

This is because the ValidateString method was called with a null string argument, which throws a SystemException. The SystemException is then caught in the catch block and its message is printed to the console.

Explanation

In the example above, we created a method called ValidateString that accepts a string argument and throws a SystemException if the string is null or empty. We then called the ValidateString method with a null string argument, which threw a SystemException. The SystemException was then caught in the catch block and its message was printed to the console.

Use

SystemException can be used to handle any type of exception that is defined in the core .NET Framework. You can use it to catch exceptions that are thrown by other methods, classes, or libraries.

Important Points

• SystemException is the base class for all exceptions that are defined in the core .NET Framework.
• Always catch the specific exception type when possible, instead of catching SystemException.
• Use SystemException to catch exceptions that are not specific to any particular type of exception.

Summary

In this tutorial, we discussed how to use SystemException in C#. We covered the syntax, example, output, explanation, use, and important points of SystemException in C#. With this knowledge, you can now catch exceptions that are defined in the core .NET Framework with SystemException and handle them in your code.