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DataMemberAttribute.IsRequired Property

Gets or sets a value that instructs the serialization engine whether the member must be present in the serialized data when it is being deserializing.

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

public bool IsRequired { get; set; }

Property Value

Type: System.Boolean
true, if the member is required; otherwise, false. The default is false.

ExceptionCondition
SerializationException

The member is not present or the member is present but it has a default value with EmitDefaultValue set to true.

The property is used for ensuring compatibility with future versions of a type.


	    // 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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