Web Service Method with Optional Parameters

Question

Possible Duplicate:
Can I have an optional parameter for an ASP.NET SOAP web service

I have tried looking around for this but I really cannot find the right solution for what I want to do. Sorry for the repetition since I know this has been asked before. I have a Web Service Method in which I want to have an optional parameter such as:

public void MyMethod(int a, int b, int c = -3)

I already know I cannot use nullable parameters, so I am just trying to use a default value. Problem is when I call this method without supplying argument c is still get an exception. Is there somewhere I have to specify it is in fact optional?

Thanksю

This is not a duplicate i guess.. especially because of the answer. The old question(2009) metions workaround without overload (possible older version of ASP.NET).. and current thread(2011) answer shows real overloads are possible. — , Apr 02 '13 at 20:31

score 30 · Answer 1 · edited Jun 02 '16 at 13:46

30

You can achieve optional parameters by overloads and using the MessageName property.

[WebMethod(MessageName = "MyMethodDefault")]
public void MyMethod(int a, int b)
{
      MyMethod( a, b, -3);
}

[WebMethod(MessageName = "MyMethod")]
public void MyMethod(int a, int b, int c)

For this to work, you may also need to change

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

to

[WebServiceBinding(ConformsTo = WsiProfiles.None)]

if you haven't done so already, as WS-I Basic Profile v1.1 does not allow overloads

edited Jun 02 '16 at 13:46

Inspector Squirrel

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answered Sep 27 '11 at 08:08

Markis

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7

To make this work, you may also need to change [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] to [WebServiceBinding(ConformsTo = WsiProfiles.None)] as WS-I Basic Profile v1.1 does not allow overloads – ShibbyUK Aug 21 '15 at 08:45
I have a perfect solution here https://stackoverflow.com/a/71273352/3715484 – Mohsin Feb 26 '22 at 01:24

abatishchev · Answer 2 · 2013-06-06T17:28:47.183

10

Use methods overloading:

[WebMethod(MessageName = "MyMethod1")]
public void MyMethod(int a, int b)
{
    return MyMethod(a, b, -3);
}

[WebMethod(MessageName = "MyMethod2")]
public void MyMethod(int a, int b, int c)
{
}

edited Jun 06 '13 at 17:28

answered Sep 27 '11 at 08:07

abatishchev

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How would I call it from the service? – Si8 Jan 19 '17 at 17:15
@Si8 do you mean how to call this service now? The easiest way would be to generate a proxy class using Visual Studio – abatishchev Jan 20 '17 at 17:10
I was able to figure it out. Thank you. – Si8 Jan 20 '17 at 17:12
I have the perfect solution here https://stackoverflow.com/a/71273352/3715484 – Mohsin Feb 26 '22 at 01:25

score 3 · Answer 3 · edited May 23 '17 at 12:16

3

I've looked into optional parameters etc. before, and straight asmx web services don't support this (with default generated WSDLs). With WCF however, you can mark parameters in your datacontract as IsRequired=false - see Optional parameters in ASP.NET web service

edited May 23 '17 at 12:16

Community

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answered Sep 27 '11 at 08:00

Chris Pont

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Web Service Method with Optional Parameters

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