How do you use an extension method in an InvokeMethod workflow? -

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i have system.activities.statements.invokemethod activity. i'm trying activate with

targettype: (null) targetobject: licxfiles //an icollection<string> methodname: storeifhasvalue

the storeifhasvalue:

public static void storeifhasvalue(this icollection<string> collection, string value)     {         if (value.isnullorempty( )==false)             collection.add(value);     }

the param i'm passing workflow designer :

direction: in type: string value: licxutilities.checkforlicx(projectpath,doc)

checkforlicx:

        public static string checkforlicx(string projpath, xdocument proj)     {          var ns=proj.root.name.namespace;         var q = refs in proj.root.elements(ns+"itemgroup").descendants(ns+"embeddedresource")                 refs.attribute("include").value.endswith(".licx", stringcomparison.currentcultureignorecase)                 select refs.attribute("include").value;         var licx=q.firstordefault( ); //assume there 1 .licx file reference in project         if (licx.isnullorempty( ))             return null;         return system.io.path.combine(projpath, licx);     }

is problem i'm using method call param? or why give error

'icollection`1' not have public instance method named 'storeifhasvalue' matching parameter types, generic type arguments, , generic type constraints supplied invokemethod 'check , store'.

never tried suspect need treat static method call, is, , pass object first parameter. empty targetobject property , set targettype class implements extension method.


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