ExpectedExceptionAttribute Class
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ExpectedExceptionAttribute Class

Indicates that an exception is expected during test method execution. This class cannot be inherited.


Namespace:  Microsoft.VisualStudio.TestTools.UnitTesting
Assembly:  Microsoft.VisualStudio.QualityTools.UnitTestFramework (in Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll)

[AttributeUsageAttribute(AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public sealed class ExpectedExceptionAttribute : ExpectedExceptionBaseAttribute

The ExpectedExceptionAttribute type exposes the following members.

Public methodExpectedExceptionAttribute(Type)Initializes a new instance of the ExpectedExceptionAttribute class with an expected exception.
Public methodExpectedExceptionAttribute(Type, String)Initializes a new instance of the ExpectedExceptionAttribute class with and expected exception type and a message that describes the exception.

Public propertyAllowDerivedTypes
Public propertyExceptionTypeGets the expected exception type.
Protected propertyNoExceptionMessageInfrastructure. (Inherited from ExpectedExceptionBaseAttribute.)
Protected propertyTestContextInfrastructure. (Inherited from ExpectedExceptionBaseAttribute.)
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)

Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Protected methodVerifyInfrastructure. (Inherited from ExpectedExceptionBaseAttribute.)

Explicit interface implemetationPrivate methodSystem#Runtime#InteropServices#_Attribute#GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate methodSystem#Runtime#InteropServices#_Attribute#GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate methodSystem#Runtime#InteropServices#_Attribute#GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate methodSystem#Runtime#InteropServices#_Attribute#InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)

This attribute is used to test whether an expected exception is thrown. The test method will pass if the expected exception is thrown. The test will fail if the thrown exception inherits from the expected exception.

If a test has both an ExpectedException attribute and an Assert statement, either one can cause the test to fail. To determine whether the attribute or the statement caused the test to fail, double-click the test result to open the Results Details page for the test. For more information about test results, see Test Results Reported.

This attribute can be specified on a method. There can be only one instance of this attribute on a method.

For more information about how to use attributes, see Extending Metadata Using Attributes.

The following class contains the method to test:

using System;

namespace MyCSNamespace
    public class DivisionClass
        public int Divide(int numerator, int denominator)
            return numerator / denominator;

The following test method tests the Divide method of the DivisionClass object. It tests for the existence of a DivideByZeroException.

using Microsoft.VisualStudio.TestTools.UnitTesting;
using MyCSNamespace;

namespace MyCSTestProject
    public class DivisionClassTest
        public void DivideTest()
            DivisionClass target = new DivisionClass();
            int numerator = 4;
            int denominator = 0;
            int actual;
            actual = target.Divide(numerator, denominator);

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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