Throwing multiple exceptions in .Net or C#

Question

Aryan Kumar · Answer

Sure, here are the ways to throw multiple exceptions in .NET and C#:

Using the throw statement: The throw statement is used to throw an exception. You can throw any exception that you want, including multiple exceptions. To throw multiple exceptions, you can use the throw statement multiple times. For example, the following code throws two exceptions:

C#

try {
  // This code might raise an exception
  throw new Exception("This is the first exception.");
} catch (Exception e) {
  throw new Exception("This is the second exception.");
}

Using the AggregateException class: The AggregateException class is a class that represents a collection of exceptions. You can use the AggregateException class to throw multiple exceptions at once. To do this, you can create an instance of the AggregateException class and then add the exceptions that you want to throw to the AggregateException object. For example, the following code throws two exceptions using the AggregateException class:

C#

try {
  // This code might raise an exception
  throw new Exception("This is the first exception.");
} catch (Exception e) {
  AggregateException ae = new AggregateException();
  ae.Add(new Exception("This is the second exception."));
  throw ae;
}

Using the when keyword: The when keyword is a new feature in C# 8 that allows you to throw multiple exceptions based on a condition. To use the when keyword, you need to wrap the code that you want to execute in a try block. Then, you need to use the when keyword to specify the condition that you want to check. If the condition is true, the code in the try block will be executed. Otherwise, the exception that you specify in the when clause will be thrown. For example, the following code throws an ArgumentNullException exception if the string argument is null:

C#

try {
  string str = null;
  // This code might raise an exception
  throw new Exception("This is the first exception.");
} catch (Exception e) {
  throw new ArgumentNullException("str", "The string argument cannot be null.");
}

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Throwing multiple exceptions in .Net or C#

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