Статья
11/18/2011

DefaultValueAttribute Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Specifies the default value for a property.

Inheritance Hierarchy

System.Object
System.Attribute
System.ComponentModel.DefaultValueAttribute

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

Syntax

'Declaration
<AttributeUsageAttribute(AttributeTargets.All)> _
Public Class DefaultValueAttribute _
    Inherits Attribute

[AttributeUsageAttribute(AttributeTargets.All)]
public class DefaultValueAttribute : Attribute

The DefaultValueAttribute type exposes the following members.

Constructors

	Name	Description
	DefaultValueAttribute(Boolean)	Initializes a new instance of the DefaultValueAttribute class using a Boolean value.
	DefaultValueAttribute(Byte)	Initializes a new instance of the DefaultValueAttribute class using an 8-bit unsigned integer.
	DefaultValueAttribute(Char)	Initializes a new instance of the DefaultValueAttribute class using a Unicode character.
	DefaultValueAttribute(Double)	Initializes a new instance of the DefaultValueAttribute class using a double-precision floating point number.
	DefaultValueAttribute(Int16)	Initializes a new instance of the DefaultValueAttribute class using a 16-bit signed integer.
	DefaultValueAttribute(Int32)	Initializes a new instance of the DefaultValueAttribute class using a 32-bit signed integer.
	DefaultValueAttribute(Int64)	Initializes a new instance of the DefaultValueAttribute class using a 64-bit signed integer.
	DefaultValueAttribute(Object)	Initializes a new instance of the DefaultValueAttribute class.
	DefaultValueAttribute(Single)	Initializes a new instance of the DefaultValueAttribute class using a single-precision floating point number.
	DefaultValueAttribute(String)	Initializes a new instance of the DefaultValueAttribute class using a String.
	DefaultValueAttribute(Type, String)	Initializes a new instance of the DefaultValueAttribute class, converting the specified value to the specified type, and using an invariant culture as the translation context.

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Properties

	Name	Description
	Value	Gets the default value of the property this attribute is bound to.

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Methods

	Name	Description
	Equals	Returns whether the value of the given object is equal to the current DefaultValueAttribute. (Overrides Attribute.Equals(Object).)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Returns the hash code for this instance. (Overrides Attribute.GetHashCode().)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	Match	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	SetValue	Sets the default value for the property to which this attribute is bound.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

You can create a DefaultValueAttribute with any value. A member's default value is typically its initial value. A visual designer can use the default value to reset the member's value. Code generators can use the default values also to determine whether code should be generated for the member.

Topic	Location
Developing Custom Data-Bound Web Server Controls for ASP.NET 1.1	Authoring ASP.NET Controls
Walkthrough: Developing and Using a Custom Server Control	Authoring ASP.NET Controls
Developing Custom Data-Bound Web Server Controls for ASP.NET 2.0	Authoring ASP.NET Controls
Walkthrough: Creating a Custom Data-Bound ASP.NET Web Control for ASP.NET 2.0	Authoring ASP.NET Controls
Walkthrough: Creating a Custom Data-Bound ASP.NET Web Control for ASP.NET 1.1	Authoring ASP.NET Controls
Developing Custom Data-Bound Web Server Controls for ASP.NET 1.1	Authoring ASP.NET Controls
Walkthrough: Developing and Using a Custom Server Control	Authoring ASP.NET Controls
Developing Custom Data-Bound Web Server Controls for ASP.NET 2.0	Authoring ASP.NET Controls
Walkthrough: Creating a Custom Data-Bound ASP.NET Web Control for ASP.NET 2.0	Authoring ASP.NET Controls
Walkthrough: Creating a Custom Data-Bound ASP.NET Web Control for ASP.NET 1.1	Authoring ASP.NET Controls
Walkthrough: Developing and Using a Custom Server Control	Authoring ASP.NET Controls
Walkthrough: Developing and Using a Custom Server Control	Authoring ASP.NET Controls
Developing Custom Data-Bound Web Server Controls for ASP.NET 1.1	Authoring ASP.NET Controls
Developing Custom Data-Bound Web Server Controls for ASP.NET 2.0	Authoring ASP.NET Controls
Walkthrough: Creating a Custom Data-Bound ASP.NET Web Control for ASP.NET 2.0	Authoring ASP.NET Controls
Walkthrough: Creating a Custom Data-Bound ASP.NET Web Control for ASP.NET 1.1	Authoring ASP.NET Controls

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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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