c# - Force WCF XML Serializer to include empty strings -

i have following property in struct being returned wcf service:

[xmlattribute] public string batchid;   

in cases value of batchid empty string, serialization excludes property resulting xml if never included in object begin with. how can force serializer include property, if empty string?

edit: using base xml serializer , not datacontract serializer emitdefaultvalues not option.

try use datamemberattribute emitdefaultvalue = true:

[xmlattribute, datamember(emitdefaultvalue=true)] public string batchid_sched; 

the emitdefaultvalue cannot used xml serializer.

i think way implement ixmlserializable interface , manually serialize/deserialize fields/properties of class:

public class test:ixmlserializable {     public string prop;      public void writexml (xmlwriter writer)     {         writer.writeattributestring("prop", prop ?? "");     }      public void readxml (xmlreader reader)     {         if(reader.hasattributes)         {             prop = reader.getattribute("prop");         }     }      public xmlschema getschema()     {         return null;     } }