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DataMemberAttribute.EmitDefaultValue Property

Gets or sets a value that specifies whether to serialize the default value for a field or property being serialized.

Namespace:  System.Runtime.Serialization
Assembly:  System.Runtime.Serialization (in System.Runtime.Serialization.dll)

public bool EmitDefaultValue { get; set; }

Property Value

Type: System.Boolean
true if the default value for a member should be generated in the serialization stream; otherwise, false. The default is true.

In .NET Framework, types have a concept of default values. For example, for any reference type the default value is null (Nothing in Visual Basic), and for an integer type it is 0. It is occasionally desirable to omit a data member from the serialized data when it is set to its default value. To do this, set the EmitDefaultValue property to false (it is true by default).

NoteNote:

Setting the EmitDefaultValue property to false is not a recommended practice. It should be done only if there is a specific requirement to do so (such as for interoperability or to reduce data size).


	    // Define the data contract.
    	[DataContract(Name = "Customer" , Namespace = "http://www.contoso.com" ) ]
    	public class User
    	{
        	[DataMember(Name = "Last" , EmitDefaultValue = true , IsRequired = true , Order = 2 )]
       		public string Name { get; set; }

        	[DataMember(Order = 1)]
        	public int Age { get; set; }

        	public User() { }

        	public User(string newName, int newAge)
        	{
            		Name = newName;
            		Age = newAge;
        	}
    	}


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: Windows Phone OS 7.0

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

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