Web API optional parameters

Question

I have a controller with the following signature    Route  products filter  apc apc   xpc xpc   sku sku     public IHttpActionResult Get string apc  string xpc  int  sku            I call this method with following URIs      api products filter apc AA amp xpc BB   api products filter sku 7199123   The first URI works without issue  The second one has a strange side effect  Even though the default values for apc and xpc should be null when not provided  the parameters are actually their names  I can overcome this by adding the additional logic   apc    apc     apc     null   apc  xpc    xpc     xpc     null   xpc    This seems like a hack  and would be problematic if value passed was ever equal to the parameter name    Is there a way to define the Route without this side effect

User · Answer

Sku is an int  can t be defaulted to string  sku   Please check Optional URI Parameters and Default Values

User · Answer

I figured it out  I was using a bad example I found in the past of how to map query string to the method parameters    In case anyone else needs it  in order to have optional parameters in a query string such as      api products filter apc AA amp xpc BB    api products filter sku 7199123   you would use    Route  products filter  apc    xpc    sku      public IHttpActionResult Get string apc   null  string xpc   null  int  sku   null            It seems odd to have to define default values for the method parameters when these types already have a default

User · Answer

you need only set default value to parameters you do not need the Route attribute    public IHttpActionResult Get string apc   null  string xpc   null  int  sku   null

[c#] Web API optional parameters

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