SuppressMessageAttribute Class

Suppresses reporting of a specific static analysis tool rule violation, allowing multiple suppressions on a single code artifact.

Namespace:   System.Diagnostics.CodeAnalysis
Assembly:  mscorlib (in mscorlib.dll)

Inheritance Hierarchy

[AttributeUsageAttribute(AttributeTargets.All, Inherited = false, 
	AllowMultiple = true)]
public sealed class SuppressMessageAttribute : Attribute
[AttributeUsageAttribute(AttributeTargets::All, Inherited = false, 
	AllowMultiple = true)]
public ref class SuppressMessageAttribute sealed : Attribute
[<AttributeUsageAttribute(AttributeTargets.All, Inherited = false,
    AllowMultiple = true)>]
type SuppressMessageAttribute = 
        inherit Attribute
<AttributeUsageAttribute(AttributeTargets.All, Inherited := False,
	AllowMultiple := True)>
Public NotInheritable Class SuppressMessageAttribute
	Inherits Attribute
System_CAPS_pubmethod SuppressMessageAttribute

Initializes a new instance of the SuppressMessageAttribute class, specifying the category of the static analysis tool and the identifier for an analysis rule.


Gets the category identifying the classification of the attribute.


Gets the identifier of the static analysis tool rule to be suppressed.


Gets or sets the justification for suppressing the code analysis message.


Gets or sets an optional argument expanding on exclusion criteria.


Gets or sets the scope of the code that is relevant for the attribute.


Gets or sets a fully qualified path that represents the target of the attribute.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)

System_CAPS_pubmethod Equals

This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod GetHashCode

Returns the hash code for this instance.(Inherited from Attribute.)

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethod IsDefaultAttribute

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)

System_CAPS_pubmethod Match

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod ToString

Returns a string that represents the current object.(Inherited from Object.)

Explicit Interface Implementations
System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetIDsOfNames

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfo

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfoCount

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeInvoke

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)


This attribute can be applied to any application element. For a complete list of the violations that can be suppressed, see Code Analysis for Managed Code Warnings.


The ConditionalAttribute is applied to this class, specifying the preprocessing symbol "CODE_ANALYSIS" as the conditional symbol that determines whether the attribute call is included or omitted. If the symbol is defined, the attribute call is included; otherwise, the call is omitted.

When you right-click a Code Analysis warning in the Visual Studio Error List and then click Suppress Message(s), a SuppressMessage attribute is added either in your code or to the project's global suppressions file. For more information about the SuppressMessage attribute and its use in Visual Studio, see In Source Suppression Overview.


The following code example shows the use of the SuppressMessageAttribute attribute to suppress performance warning messages.

using System;
using System.Diagnostics.CodeAnalysis;

namespace CodeAnalysisSample
    class Library
        [SuppressMessage("Microsoft.Performance", "CA1801:ReviewUnusedParameters", MessageId = "isChecked")]
        [SuppressMessage("Microsoft.Performance", "CA1804:RemoveUnusedLocals", MessageId = "fileIdentifier")]
        static void FileNode(string name, bool isChecked)
            string fileIdentifier = name;
            string fileName = name;
            string version = String.Empty;

Imports System
Imports System.Diagnostics.CodeAnalysis

Class Library

    <SuppressMessage("Microsoft.Performance", "CA1801:ReviewUnusedParameters", MessageId:="isChecked"), _
     SuppressMessage("Microsoft.Performance", "CA1804:RemoveUnusedLocals", MessageId:="fileIdentifier")> _
    Shared Sub FileNode(ByVal name As String, ByVal isChecked As Boolean)
        Dim fileIdentifier As String = name
        Dim fileName As String = name
        Dim version As String = String.Empty

    End Sub 'FileNode
End Class 'Library 
Version Information
Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Thread Safety

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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