How to use Java-style throws keyword in C#?

Question

In Java, the throws keyword allows for a method to declare that it will not handle an exception on its own, but rather throw it to the calling method.

Is there a similar keyword/attribute in C#?

If there is no equivalent, how can you accomplish the same (or a similar) effect?

Answer 1

The op is asking about the C# equivalent of Java's throws clause - not the throw keyword. This is used in method signatures in Java to indicate a checked exception can be thrown.

In C#, there is no direct equivalent of a Java checked exception. C# has no equivalent method signature clause.

// Java - need to have throws clause if IOException not handled public void readFile() throws java.io.IOException {   ...not explicitly handling java.io.IOException... } 

translates to

// C# - no equivalent of throws clause exceptions are unchecked public void ReadFile()  {   ...not explicitly handling System.IO.IOException... } 

Answer 2

In Java, you must either handle an exception or mark the method as one that may throw it using the throws keyword.

C# does not have this keyword or an equivalent one, as in C#, if you don't handle an exception, it will bubble up, until caught or if not caught it will terminate the program.

If you want to handle it then re-throw you can do the following:

try {   // code that throws an exception } catch(ArgumentNullException ex) {   // code that handles the exception   throw; }