pass optional parameter in wcf service

Question

I had a function in WCF that takes one parameter and is being called from another application. Now, I want to add a optional parameter in the WCF so that it does not affect the method being called in the previous code.

getData(int number, int type=0)

I tried using default value in the second parameter, setting [WebGet(UriTemplate but no success. If I use IsRequired property of DataMember then it will change the method call of previous code as well.

I don't want to create another WCF method. Is there any other workaround for it ?

score 3 · Answer 1 · edited May 23 '17 at 12:08

3

You can't use optional parameters when implementing an interface for a WCF.Can't use optional parameters when implementing an interface for a WCF

Use function overloading

getData(int number)
getData(int number, int type)

edited May 23 '17 at 12:08

Community

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answered Dec 24 '15 at 12:26

Narek Arzumanyan

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It will lead to duplicate methods. I have 100+ wcf methods and don't want to duplicate them for optional parameter – AshishJindal Dec 24 '15 at 12:59
http://forums.asp.net/t/1608437.aspx?can+we+use+optional+params+in+C+while+defining+service+contracts+ – Narek Arzumanyan Dec 24 '15 at 13:11

score 0 · Answer 2 · answered Nov 18 '16 at 09:17

You can't pass optional parameters in a Wcf service method, also you can't overload method in Wcf service with same Name. If you want to overload method you can use Name property to overload methods this way:

[OperationContract (Name = "MethodName")]

I resolved this issue by setting default null value in the URI so that made this parameter optional if user provided e.g: "type" value, i received it but if user didn't provide any value, in that case default value was null so that solved my problem.

Hope this answers your question.

pass optional parameter in wcf service

2 Answers2