DataMemberAttribute.IsRequired Property

Property Value

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

        ' Define the data contract.
        <DataContract(Name := "Customer", Namespace := "https://www.contoso.com")> _
        Public Class User
            Private privateName As String
            <DataMember(Name := "Last", EmitDefaultValue := True, IsRequired := True, Order := 2)> _
            Public Property Name() As String
                Get
                    Return privateName
                End Get
                Set(ByVal value As String)
                    privateName = value
                End Set
            End Property

            Private privateAge As Integer
            <DataMember(Order := 1)> _
            Public Property Age() As Integer
                Get
                    Return privateAge
                End Get
                Set(ByVal value As Integer)
                    privateAge = value
                End Set
            End Property

            Public Sub New()
            End Sub

            Public Sub New(ByVal newName As String, ByVal newAge As Integer)
                    Name = newName
                    Age = newAge
            End Sub
        End Class

        // Define the data contract.
        [DataContract(Name = "Customer" , Namespace = "https://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;
            }
        }