parameters

问题 Could someone please explain the difference between parameter passing in C please? According to professor notes there are 4 different ways to pass parameters Call-by-value Call-by-address (pointer) Call-by-alias Global variable / Static variable If you could please give an example, I would greatly appreciate that, and your work would be commended. 回答1: Call-by-value Passing the value to a function as a parameter. If the function modifies the variable, the actual variable won't get changed.

问题 from f in CUSTOMERS where depts.Contains(f.DEPT_ID) select f.NAME depts is a list ( IEnumerable<int> ) of department ids This query works fine until you pass a large list (say around 3000 dept ids) .. then I get this error: The incoming tabular data stream (TDS) remote procedure call (RPC) protocol stream is incorrect. Too many parameters were provided in this RPC request. The maximum is 2100. I changed my query to: var dept_ids = string.Join(" ", depts.ToStringArray()); from f in CUSTOMERS

问题 from f in CUSTOMERS where depts.Contains(f.DEPT_ID) select f.NAME depts is a list ( IEnumerable<int> ) of department ids This query works fine until you pass a large list (say around 3000 dept ids) .. then I get this error: The incoming tabular data stream (TDS) remote procedure call (RPC) protocol stream is incorrect. Too many parameters were provided in this RPC request. The maximum is 2100. I changed my query to: var dept_ids = string.Join(" ", depts.ToStringArray()); from f in CUSTOMERS

问题 I'm making an C# windows Form Application in visual studio 2010. That application is connecting to an mysql database, and I want to insert data in it. Now do I have this part of code: MySqlConnection connection; string cs = @"server=server ip;userid=username;password=userpass;database=databse"; connection = new MySqlConnection(cs); connection.Open(); MySqlCommand command = new MySqlCommand(); string SQL = "INSERT INTO `twMCUserDB` (`mc_userName`, `mc_userPass`, `tw_userName`, `tw_userPass`)

问题 I read the tutorial DIY widgets - How to embed your site on another site for XSS Widgets by Dr. Nic. I'm looking for a way to pass parameters to the script tag. For example, to make the following work: <script src="http://path/to/widget.js?param_a=1&param_b=3"></script> Is there a way to do this? Two interesting links: How to embed Javascript widget that depends on jQuery into an unknown environment (Stackoverflow discussion) An article on passing parameters to a script tag 回答1: I apologise

问题 When I saw many sites' source code, parameters were passed to the linking file (CSS/JavaScript). In the Stack Overflow source, I got <script type="text/javascript" src="http://sstatic.net/js/master.js?v=55c7eccb8e19"></script> Why is master.js?v=55c7eccb8e19 used? I am sure that JavaScript/CSS files can't get the parameters. What is the reason? 回答1: It is usually done to prevent caching. Let's say you deploy version 2 of your new application and you want to cause the clients to refresh their

问题 I give a string variable a value in the normal execution of the code ,but if an exception happen I will give it another value , the problem is that in catch block the value is still the same as i assign first . Here is my code ,first I assign page value "addUser" inside try block and in catch I give it "ErrorPage" value , I send the value of page within http request to forword method and inside it i print the value of page. I cause an error in the excution of the code an i want it to go

问题 When I saw many sites' source code, parameters were passed to the linking file (CSS/JavaScript). In the Stack Overflow source, I got <script type="text/javascript" src="http://sstatic.net/js/master.js?v=55c7eccb8e19"></script> Why is master.js?v=55c7eccb8e19 used? I am sure that JavaScript/CSS files can't get the parameters. What is the reason? 回答1: It is usually done to prevent caching. Let's say you deploy version 2 of your new application and you want to cause the clients to refresh their

问题 I am running my JavaFX application like this: public class MainEntry { public static void main(String[] args) { Controller controller = new Controller(); Application.launch(MainStage.class); } } MainStage class extends Appication . Application.launch starts my JavaFX window in a special FX-thread, but in my main method I don't even have an instance of my MainStage class. How to pass non-String parameter ( controller in my case) to MainStage instance? Is it a flawed design? 回答1: Usually, there

问题 I am running my JavaFX application like this: public class MainEntry { public static void main(String[] args) { Controller controller = new Controller(); Application.launch(MainStage.class); } } MainStage class extends Appication . Application.launch starts my JavaFX window in a special FX-thread, but in my main method I don't even have an instance of my MainStage class. How to pass non-String parameter ( controller in my case) to MainStage instance? Is it a flawed design? 回答1: Usually, there