Wcf messagecontract and messagebodymember

Question

Hi, I'm looking for a way to specify that some MessageBodyMember is required,

so that the generated schema would have minOccurs=1 instead of minOccurs=0.

 

I know that the DataMember has such an option(IsRequired=true), however I prefer using the MessageContract for controlling other aspects of the message.

[MessageContract(IsWrapped = true, WrapperName = "CityRequestObject")]
public class CityInfoRequest
{
[MessageHeader]
public string UserKey { get; set; }
[MessageHeader]
public string TransactionID { get; set; }
[MessageHeader]
public string EntityCode { get; set; }
[MessageBodyMember]
[System.Xml.Serialization.XmlElementAttribute(IsNullable = true, Form = System.Xml.Schema.XmlSchemaForm.Qualified, Order = 0)]
public string Lang { get; set; } }