mysql - "The given key was not present in the dictionary" when Execute the mysqldatareader in C# -


i have run command without error in mysql. other command run fine code not work. know happen code.

 private static user getuser(mysqlcommand cmd)         {             user usr = new user();              mysqldatareader rdr = cmd.executereader();             if (rdr.hasrows)             {                 while (rdr.read())                 {                     usr.id = convert.toint32(rdr["id"]);                     usr.level = (level)enum.parse(typeof(level), rdr["level"].tostring());                     usr.email = rdr["email"].tostring();                     usr.createddate = convert.todatetime(rdr["createddate"].tostring());                     usr.lastlogindate = convert.todatetime(rdr["lastlogindate"].tostring());                 }             }             return usr;         }   public static user getuserfromid(int userid)         {             string qry = "select * user id = ?userid";              user user = new user();             mysqlconnection cnn = new mysqlconnection(globals.connstring);             cnn.open();              using (cnn)             {                 mysqlcommand cmd = new mysqlcommand(qry, cnn);                 cmd.parameters.addwithvalue("userid", userid);                  user = getuser(cmd);              }             cnn.close();             return user;         }

the code paste here gave me error

"the given key not present in dictionary."

on line of line 158:

mysqldatareader rdr = cmd.executereader();

do know wrong happen code? have added charset=utf8; in connectionstring people suggest in so.

the database use mariadb , connector mysql latest connector. know if have trouble.

i have no problem while run other function. problem happen in single function use mysqldatareader execution.

you use @ instead of ? calling parameter sql should called in sql as: @userid (whatever type is, varchar, int etc)

so sql proc should this

select * (tablename) userid = @userid

so in form call @userid parameter passed in sql.


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