c# - Invalid expression term error in the code -


  • error 1 best overloaded method match 'int.tryparse(string, out int)' has invalid arguments

  • error 2 argument 1: cannot convert 'int' 'string'

    it gives me error in "int.tryparse(surveys.first(), out id);" 

       l       var surveys = (from su in dbcontext.surveys                                su.username == su.username                                 select su.id); if(surveys.count() > 0)             {              int id = 0;              int.tryparse(surveys.first(), out id);                return id;              }              return 0;

remove int tryparse();

int.tryparse(surveys.first(), out int id);

should be

int.tryparse(surveys.first(), out id);

change :-

list<surveycontext> surveys = (from su in dbcontext.surveys                                           su.username == su.username                                            select su.id).tolist();

to 

list<string> surveys = (from su in dbcontext.surveys                                           su.username == su.username                                            select su.id);

you trying select string type in linq , putting in list<sometype> should list<int>. 

  var surveys = (from su in dbcontext.surveys                                               su.username == su.username                                                select su.id);    //code follows   int.tryparse(surveys.first(), out id);

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