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Attribute Constructor

Initializes a new instance of the Attribute class.

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

protected Attribute()

This constructor is only called by classes that derive from Attribute.

The following code example shows the definition of a custom parameter Attribute class with its constructor.

// Define a custom parameter attribute that takes a single message argument.
[AttributeUsage( AttributeTargets.Parameter )]
public class ArgumentUsageAttribute : Attribute
{
    // This is the attribute constructor. 
    public ArgumentUsageAttribute( string UsageMsg )
    {
        this.usageMsg = UsageMsg;
    }

    // usageMsg is storage for the attribute message. 
    protected string usageMsg;

    // This is the Message property for the attribute. 
    public string Message
    {
        get { return usageMsg; }
        set { usageMsg = value; }
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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