How do i throw an exception explicitly in c#?

Question

In Java i can explicitly specify that a method throws an exception like:

public void read() throws IOException{}

What is the c# equivalent of this?

What are the best practices for throwing custom exceptions?

I have made them serializable and provided a streaming context also .

No, that's not how you throw an exception in Java. That's how you declare a method that throws an exception. — BoltClock
– BoltClock, Commented Sep 3, 2011 at 17:34
That an exception specification. It is widely considered to be a mistake, C# doesn't have it and it is deprecated in C++. — Hans Passant
– Hans Passant, Commented Sep 3, 2011 at 17:36
my bad what i meant was how do i declare a method that throws an exception in C#..i apologise... — ashutosh raina
– ashutosh raina, Commented Sep 3, 2011 at 17:38
oki.so exception specification is a bad idea.. now for e.g. so how do i ask the caller to handle an exception that was thrown by his bad parameters ? — ashutosh raina
– ashutosh raina, Commented Sep 3, 2011 at 17:42
throw new Exception() -> throws an exception 2 caller. throw new ArgumentException() ->a standard in framework. Or you can customize this — Zenwalker
– Zenwalker, Commented Sep 3, 2011 at 17:55

Community · Accepted Answer · 2017-05-23 11:44:04Z

6

What you're referring to is the actual documentation of code that throws exceptions.

Read this thread that discusses this question: How to document thrown exceptions

edited May 23, 2017 at 11:44

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answered Sep 3, 2011 at 17:35

lysergic-acid

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2 Comments

Rune FS Over a year ago

@ashutosh What do you want then? in C# you can only document what exceptions a method throws. You can't make them a part of the signature of the method. Ie there's no way of having the compiler tell the caller of a method that he didn't handle specific exceptions. He can read the documentatio if such exist or figure it out at run time

ashutosh raina Over a year ago

@Rune FS ,@liortal yes ,i had a closer look at the exception specification for C#,it seems i just have to specify in the documentation what exceptions my method might throw and have the caller handle it . thanks for your help.

Reed Copsey · Accepted Answer · 2011-09-03 17:45:28Z

1

The topic in MSDN called Exceptions and Exception Handling covers Creating and Throwing Exceptions in detail.

However, exception specifications are not part of the C# language like they are in Java. You must rely on documentation to tell the user of your API what exceptions may be thrown. You cannot force a user to handle an exception, or document it in code.

answered Sep 3, 2011 at 17:45

Reed Copsey

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