Web Service Method with Optional Parameters

c# .net web-services optional-parameters
Steve Kiss picture Steve Kiss · Sep 27, 2011 · Viewed 60.4k times · Source

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

Answer

Markis picture Markis · Sep 27, 2011

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

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