Export (0) Print
Expand All
Expand Minimize
1 out of 1 rated this helpful - Rate this topic

CA2201: Do not raise reserved exception types

TypeName

DoNotRaiseReservedExceptionTypes

CheckId

CA2201

Category

Microsoft.Usage

Breaking Change

Breaking

A method raises an exception type that is too general or that is reserved by the runtime.

The following exception types are too general to provide sufficient information to the user:

The following exception types are reserved and should be thrown only by the common language runtime:

Do Not Throw General Exceptions

If you throw a general exception type, such as Exception or SystemException in a library or framework, it forces consumers to catch all exceptions, including unknown exceptions that they do not know how to handle.

Instead, either throw a more derived type that already exists in the framework, or create your own type that derives from Exception.

Throw Specific Exceptions

The following table shows parameters and which exceptions to throw when you validate the parameter, including the value parameter in the set accessor of a property:

Parameter Description

Exception

null reference 

System.ArgumentNullException

Outside the allowed range of values (such as an index for a collection or list)

System.ArgumentOutOfRangeException

Invalid enum value

System.ComponentModel.InvalidEnumArgumentException

Contains a format that does not meet the parameter specifications of a method (such as the format string for ToString(String))

System.FormatException

Otherwise invalid

System.ArgumentException

When an operation is invalid for the current state of an object    throw System.InvalidOperationException

When an operation is performed on an object that has been disposed    throw System.ObjectDisposedException

When an operation is not supported (such as in an overridden Stream.Write in a Stream opened for reading)    throw System.NotSupportedException

When a conversion would result in an overflow (such as in a explicit cast operator overload)    throw System.OverflowException

For all other situations, consider creating your own type that derives from Exception and throw that.

To fix a violation of this rule, change the type of the thrown exception to a specific type that is not one of the reserved types.

Do not suppress a warning from this rule.

Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

ADD
Show:
© 2014 Microsoft. All rights reserved.