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Visual Studio 2010
Visual Studio Application Lifecycle Management
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Analyzing Application Quality by Using Code Analysis Tools
Analyzing Managed Code Quality by Using Code Analysis
Code Analysis for Managed Code Warnings
Usage Warnings
CA1801: Review unused parameters
CA1806: Do not ignore method results
CA1816: Call GC.SuppressFinalize correctly
CA2200: Rethrow to preserve stack details
CA2201: Do not raise reserved exception types
CA2202: Do not dispose objects multiple times
CA2204: Literals should be spelled correctly
CA2205: Use managed equivalents of Win32 API
CA2207: Initialize value type static fields inline
CA2208: Instantiate argument exceptions correctly
CA2211: Non-constant fields should not be visible
CA2212: Do not mark serviced components with WebMethod
CA2213: Disposable fields should be disposed
CA2214: Do not call overridable methods in constructors
CA2215: Dispose methods should call base class dispose
CA2216: Disposable types should declare finalizer
CA2217: Do not mark enums with FlagsAttribute
CA2218: Override GetHashCode on overriding Equals
CA2219: Do not raise exceptions in exception clauses
CA2220: Finalizers should call base class finalizer
CA2221: Finalizers should be protected
CA2222: Do not decrease inherited member visibility
CA2223: Members should differ by more than return type
CA2224: Override equals on overloading operator equals
CA2225: Operator overloads have named alternates
CA2226: Operators should have symmetrical overloads
CA2227: Collection properties should be read only
CA2228: Do not ship unreleased resource formats
CA2229: Implement serialization constructors
CA2230: Use params for variable arguments
CA2231: Overload operator equals on overriding ValueType.Equals
CA2232: Mark Windows Forms entry points with STAThread
CA2233: Operations should not overflow
CA2234: Pass System.Uri objects instead of strings
CA2235: Mark all non-serializable fields
CA2236: Call base class methods on ISerializable types
CA2237: Mark ISerializable types with SerializableAttribute
CA2238: Implement serialization methods correctly
CA2239: Provide deserialization methods for optional fields
CA2240: Implement ISerializable correctly
CA2241: Provide correct arguments to formatting methods
CA2242: Test for NaN correctly
CA2243: Attribute string literals should parse correctly
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CA2226: Operators should have symmetrical overloads

Visual Studio 2010

TypeName

OperatorsShouldHaveSymmetricalOverloads

CheckId

CA2226

Category

Microsoft.Usage

Breaking Change

Non Breaking

A type implements the equality or inequality operator and does not implement the opposite operator.

There are no circumstances where either equality or inequality is applicable to instances of a type, and the opposite operator is undefined. Types typically implement the inequality operator by returning the negated value of the equality operator.

The C# compiler issues an error for violations of this rule.

To fix a violation of this rule, implement both the equality and inequality operators, or remove the one that is present.

Do not suppress a warning from this rule. Your type will not work in a manner that is consistent with the .NET Framework.

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