Moq + Unit Testing + System.Reflection.TargetParameterCountException: Parameter Count mismatch -

i getting "system.reflection.targetparametercountexception: parameter count mismatch" exception when attempting mock our apiclient.

i using following code setup moq response

private void setupapiclientforgetzones(ienumerable<zone> zone) {     this.mockhubapiclient.setup(x => x.getasync<ienumerable<zone>>(it.isany<string>(), it.isany<idictionary<string, string>>()))                 .returns(                     (string name) =>                     {                         return zone == null ? task.fromresult<ienumerable<zone>>(null) : task.run(() => zone);                     });              this.mockapiclientfactory.setup(x => x.createclient(it.isany<string>()))                 .returns(this.mockhubapiclient.object);         } 

the iapiclient interface attempting mock is

public interface iapiclientasync : iapiclient     {         task<string> getasync(string apicontroller);          task<t> getasync<t>(string apicontroller) t : class;          task<string> getasync(string apicontroller, idictionary<string, string> param, string querystring);          task<t> getasync<t>(string apicontroller, idictionary<string, string> param) t : class; } 

my unit test is

[test] public void getzonesnotcached() {     var data = new list<zone> { new zone { zoneid = 1, zonename = "test zone 1" }, new zone { zoneid = 2, zonename = "test zone 2" } };      this.setupapiclientforgetzones(data);      this.mockcache.setup(x => x.getitemfromcache<ienumerable<zone>>(it.isany<string>()));      var organisationservice = new organisationservice(this.mockunitofworkasync.object, this.mockapiclientfactory.object, this.mockcache.object);      var results = organisationservice.getzones(1, 1).tolist();      assert.isnotnull(results);     assert.areequal(3, results.count, "there should 3 records returned");      this.mockcache.verify(x => x.getitemfromcache<ienumerable<zone>>(it.isany<string>()), times.once());     this.mockhubapiclient.verify(x => x.getasync<ienumerable<zone>>(it.isany<string>(), it.isany<idictionary<string, string>>()), times.once()); } 

i have found numerous other posts same exception none of solutions or examples same mine.

i have been able mock response when calling getasync method has single string paramter.

    private void setupapiclientforalldealerdetails(ienumerable<dealerdetail> dealerdetails)     {         this.mockhubapiclient.setup(             x => x.getasync<ienumerable<dealerdetail>>(it.isany<string>()))             .returns(                 (string name) =>                 {                     return dealerdetails == null ? task.fromresult<ienumerable<dealerdetail>>(null) : task.run(() => dealerdetails);                 });          this.mockapiclientfactory.setup(x => x.createclient(it.isany<string>()))             .returns(this.mockhubapiclient.object);     } 

any ideas anyone?

if use expression in .returns instead of value, expression's parameters must match of method signature mocking.

for example, found in setupapiclientforgetzones:

this.mockhubapiclient.setup(x => x.getasync<ienumerable<zone>>(it.isany<string>(), it.isany<idictionary<string, string>>()))                 .returns(                     (string name) =>                       {                         return zone == null ? task.fromresult<ienumerable<zone>>(null) : task.run(() => zone);                       }); 

when should be:

this.mockhubapiclient.setup(x => x.getasync<ienumerable<zone>>(it.isany<string>(), it.isany<idictionary<string, string>>()))                 .returns<string, idictionary<string, string>>(                     (name, dict) =>                       {                         return zone == null ? task.fromresult<ienumerable<zone>>(null) : task.run(() => zone);                       });