The difference between c#ref and out

ref: You need to assign a value before calling to pass a reference to a parameter, not a value. (there are in and out)

out: The method is assigned a value , and the value is passed to the method from within the method. (only out of the input)

Both of them belong to reference passing;

1         #regionThe difference between ref and out2         /*3 Ref: You need to assign a value before calling to pass a reference to a parameter, not a value. (There are in and out)4 5 Out : The method is assigned a value, and the value is passed to the method from within the method. (only out of the input)6 7 both of them belong to reference passing;8         */9             stringUID ="Admin";Ten             stringPWD ="111111"; //The correct login password is "666666", here is the wrong password  One             stringmsg = null; A             if(Checklogin (UID, PWD, outmsg)) -             { -Console.WriteLine ("Login Successful"); the             } -             Else -             { -Console.WriteLine ("logon Failure, error reason is"+msg); +             } -              +             #endregion

1          Public Static BOOLChecklogin (stringUidstringPwd out stringmsg)2         {3             if(UID = ="Admin"&& pwd = ="666666") //account password is correct, msg is empty, login successful 4             {5msg =NULL;6                 return true;7             }8             Else9             {Tenmsg ="incorrect user name or password"; One                 return false; A             } -}

Convert out to ref results.

The difference between c#ref and out