Optional Parameters In WCF Service URI Template

This section shows how we can pass optional parameters in WCF Servuce URI.

  1. WebGet(UriTemplate = "TestMessage/{p1}?firstname={firstname}&lastname={lastname}", ResponseFormat = WebMessageFormat.Json, RequestFormat = WebMessageFormat.Xml)]  
  2. [OperationContract]  
  3. string TestMessage(string message, string firstname = "", string lastname = "");  
Whereas TestMessage is my service name and p1 parameter is compulsory whereas firstname and lastname parameters are optional but u have to specify in the URI Template but keep one thing in mind while declaring the parameters as optional u have to first preceed them with ? and then parameter name and then use & to assign the second parameter as option as per your requirement. If u see in the function declaration also i have used the optional parameter feature of .Net 4.0

Step 2 - Function Definition
  1. public string TestMessage(string message,string firstname="",string lastname="")  
  2. {  
  3.    string responsedata = string.Empty;   
  4.    responsedata = message + "" + "FirstName: " + firstname + "" + "LastName: " + lastname;  
  5.    return responsedata;  
  6. }  
Note
How to call the Service,

Input1

http://localhost:49785/Service.svc/parameter1

Output1 - parameter1 Firstname: LastName
 
In the above output, only parameter1 will be returned as u didnot specify the other 2 parameters so they will get their value as "Empty"

Input2
 
http://localhost:49785/Service.svc/parameter1?firstname=kamal&lastname=rawat

Output2 - parameter1 Firstname:kamal LastName:rawat
 
so u will see in the above output u passed both the parameters so you got all the values.

Input2
 
http://localhost:49785/Service.svc/parameter1?firstname=kamal

Output2 - 
parameter1 Firstname:kamal LastName:

In the above output parameter1 is passed i.e firstname=kamal but you wont get lastname parameter, bcoz you didn't pass and its optional if u dont pass the parameter value and will take value as empty.

Thanks for reading..