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• Business and data layer in ASP.NET MVC

  - by Shetty

  Hi, I am new to ASP.net MVC architecture. I have read in some articles that Model will contain business and data access logic. So does this mean that i have to implement the business and data access layrers in side model folder? And it is obviously not possible to add class libraries (business layer and Data access layer of n tier) in Model folder. SO please let me know how to design business and data layer if i dont want to include my LINQ queries in Controller. Thanks, Amith

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• Cannot use String.Empty as a default value for an optional parameter in C# - then what's the point?

  - by Mikeyg36

  I am reading Effective C# by Bill Wagner. In Item 14 - Minimize Duplicate Initialization Logic, he shows the following example of using the new optional parameters feature in a constructor: public MyClass(int initialCount = 0, string name = "") Notice that he used "" instead of string.Empty. He comments: You'll note [in an example above] that the second constructor specified "" for the default value on the name parameter, rather than the more customary string.Empty. That's because string.Empty is not a compile-time constant. It is a static property defined in the string class. Because it is not a compile constant, you cannot use it for the default value for a parameter. If we cannot use the string.Empty static in all situations, then doesn't that defeat the purpose of it? I thought that we would use it to be sure that we have a system-independent means of referring to the empty string. Is my understanding wrong? Thanks.

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• How to deal with multiple Facebook requests simultaneously

  - by Peter Warbo

  I'm using the Facebook SDK for my app. I have created a singleton class FacebookHelper to deal with all Facebook related logic. Whenever I make a Facebook request (i.e download friends) I set an enum i.e FacebookRequestDownloadFriends so that FacebookHelper knows how to handle errors and success for that request (since handling can be different between the different requests) This solution has worked out fine until now, because now I'm doing 2 Facebook Requests at the same time so when I set the enum for the first request i.e FacebookRequestDownloadFriends and then it will be overwritten just shortly with another request FacebookRequestDownloadEvents, so there will be confusion obviously. How can I deal with this issue without having to refactor too much code?

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• In html <a href> tag, how to call servlet before opening file dialog for download (save as)?

  - by deepthinker121

  Hi All, I am developing a web-app where I want to provide a download link to users - so they can download a zip file from my server. Now, my requirement is that I want to execute some processing logic contained in a servlet before displaying the file dialog to the user for 'zip' files. So If I write <a href="abc.zip".......> then it opens a file dialog asking the user to select the location where this file can be saved But if I want a servlet's doGet method to do some preprocessing - say like building the zip file , then how can I first call the servlet and then open the file dialog. Will the following snippet work? <a href="MyHandlerServlet;abc.zip".......> Thanks for your help !!

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• Page inheritance in mixed asp.net Forms and MVC application

  - by Rising Star

  I'm working on a web application. One of my co-workers has written some asp.net forms pages. The page classes all inherit from BasePageClass, which of course inherits from the Page class. I wish to add some MVC controllers that I've been told need to use the same logic implemented in the BasePageClass. Ordinarily, I would want to inherit the functions in the BasePageClass in the controller classes, but this breaks the inheritance heirarchy. What is the best practice for solving this problem?

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• Really lost with OpenID and ASP.NET MVC

  - by Stacey

  I'm attempting to implement OpenID with ASP.NET MVC (Yeah, we haven't heard that one before I'm sure!) That really isn't the big problem, though. My huge problem is that I am exceedingly confused about how to do this alongside an application that will need to store a lot of information about the logged in users (profiles, histories, etc) It seems to me that OpenID takes away the site-centric logic and makes it, well, open. This is all well and good if you just make an authentication ticket to be seen as a 'validated' user - but in all seriousness I am completely lost. Is it possible to implement OpenID such that logging in with it will allow users to 'exist' on my own application as if they had gone through normal registration?

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• How can I run a function anytime anything is animated with jQuery?

  - by WillyCornbread

  Hi - I have some jQuery animations in my code to slide divs up and down in response to some mouse clicks and other logic. This is all working just peachy, however in IE 6 some of the smaller icon images on the page don't slide along with the rest of the div for some strange reason. They kind of stay put then flicker into the new position and I've chalked this up to an IE6 'feature'. Considering that I have to support IE6, I wanted to just hide the icons anytime an animation started, and show them again when the queue was empty. I couldn't find a reference to any kind of events or hooks into the queue itself and I'd rather not add the hide code, then the show code to every animation as a callback. Thanks if you can help- b

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• Multiple operations depending on the type of the object passed

  - by mixm

  Assuming I create a method which is passed an object and that method would perform an action depending on the object passed. How should I identify the object? I thought of using the class name to identify the object, but that may be impractical since I could easily change the class name of objects, and generate headaches during future development. Am I right? edit: for example, i have objects ball and bomb. if i have another object called wall, and the wall has the method to resolve collisions with the wall (e.g. the coordinates of the colliding ball and bomb) but have different logic depending on the colliding object (i.e. ball and bomb)

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• MonoRail - Clearing value on edit form submission doesn't trigger validation

  - by Justin

  Hey, In a MonoRail app I have an add/edit view. On add if I don't pick a value for a dropdown I get a validation error and am forced to pick a value. However, if I then edit that same item and reset the dropdown back to the first item ("Select an Item", "0"), it saves and doesn't say it was invalid. Debugging the entity sent back to the server, I can see that it's sending the original value for the dropdown instead of the new value of "0". What's going on here? The first thing I would expect is that it would trigger the validation since the dropdown value isn't set. The second thing I would expect is that it would send the new value I send, not the original. It does send the new value if I change it to another value, but it's as if it has internal logic that says - "I'm updating this entity and a new value was not passed, just don't change the entity value." Thanks, Justin

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• PL/SQL exception and Java programs

  - by edwards

  Hi Business logic is coded in pl/sql packages procedures and functions. Java programs call pl/sql packages procedures and functions to do database work. pl/sql programs store exceptions into Oracle tables whenever an exception is raised. How would my java programs get the exceptions since the exception instead of being propagated from pl/sql to java is getting persisted to a oracle table and the procs/functions just return 1 or 0. Sorry folks i should have added this constraint much earlier and avoided this confusion. As with many legacy projects we don't have the freedom to modify the stored procedures.

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• Multiple Table Joins to Improve Performance?

  - by EdenMachine

  If I have a table structure like this: Transaction [TransID, ...] Document [DocID, TransID, ...] Signer [SignerID, ...] Signature [SigID, DocID, SignerID, ...] And the business logic is like this: Transactions can have multiple documents Documents can have multiple signatures And the same signer can have multiple signatures in multiple documents within the same transaction So, now to my actual question: If I wanted to find all the documents in a particular transaction, would it be better, performance-wise, if I also stored the TransID and the DocID in the Signer table as well so I have smaller joins. Otherwise, I'd have to join through the Signature Document Transaction Documents to get all the documents in the transaction for that signer. I think it's really messy to have that many relationships in the Signer table though and it doesn't seem "correct" to do it that way (also seems like an update nightmare) but I can see that it might be better performance for direct joins. Thoughts? TIA!

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• What is the best practice in C# to propagate an exception thrown in a finally block without loosing an exception from a catch block?

  - by Sergey Smolnikov

  When an exception is possible to be thrown in a finally block how to propagate both exceptions - from catch and from finally? As a possible solution - using an AggregateException: internal class MyClass { public void Do() { Exception exception = null; try { //example of an error occured in main logic throw new InvalidOperationException(); } catch (Exception e) { exception = e; throw; } finally { try { //example of an error occured in finally throw new AccessViolationException(); } catch (Exception e) { if (exception != null) throw new AggregateException(exception, e); throw; } } } }

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• JavaScript - question regarding data structure

  - by orokusaki

  I'm trying to calculate somebody's bowel health based on a points system. I can edit the data structure, or logic in any way. I'm just trying to write a function and data structure to handle this ability. Pseudo calculator function: // Bowel health calculator var points = 0; If age is from 30 and 34: points += 1 If age is from 35 and 40: points += 2 If daily BMs is from 1 and 3: points -= 1 If daily BMs is from 4 and 6: points -= 2 return points; Pseudo data structure: var points_map = { age: { '30-34': 1, '35-40': 2 }, dbm: { '1-3': -1, '4-6': -2 } }; I have a full spreadsheet of data like this, and I am trying to write a DRY version of code and a DRY version of this data (ie, probably not a string for the '30-34', etc) in order to handle this sort of thing without a humongous number of switch statements.

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• jquery disable rule validation on a single field

  - by shake

  I am using mvc to create forms that are generated at runtime. For validation, I am trying my hand at the jquery validation library which is very convenient to use. I have the validation expression of each field in the cdata attribute of the tag <input type="text" name="xyz" id="xyz" class="defaultTextBox" cdata="{validate:{required:true, decimal:true, messages: {required:'Please enter an decimal value', decimal:'Please enter a valid decimal'}}}"> This works beautifully. Now one more requirement I have is that some fields are being shown and hidden according to the logic on the page and I need to disable the validation on the hidden fields such that they do not interfere with the form submission. Just toggling the required:true to false and back to true should be enough. Only i do not know how. Anyone has any experience with that?

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• Unnecessary 'else' statement

  - by Vitalii Fedorenko

  As you know, in Eclipse you can turn on "Unnecessary 'else' statement" check that will trigger on if-then-else with premature return. And, from my experience, there are two most possible situations when use such statement: 1) Pre-check: if (validate(arg1)) { return false; } doLotOfStuff(); 2) Post-check: doLotOfStuff(); if (condition) { return foo; } else { return bar; } In the second case, if the trigger is on, Eclipse will suggest you to change the code to: doLotOfStuff(); if (condition) { return foo; } return bar; However, I think that the return with else statement is more readable as it is like direct mapping of business logic. So I am curios if this "Unnecessary 'else' statement" code convention is widespread or else statement is more preferable?

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• Design pattern for extending Android's activities?

  - by Carl

  While programming on Android, I end up writing a parent activity which is extended by several others. A bit like ListActivity. My parent activity extends Activity. if I intend to use a Map or a List, I can't use my parent activity as superclass - the child activity can only extend one activity obviously. As such I end up writing my parent activities with the same logic for Activity, ListActivity, MapActivity and so forth. What am I looking for is some sort of trait functionality/design pattern which would help in this case. Any suggestions?

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• Proper error handling in a custom Zend_Autoloader?

  - by Pekka

  I'm building a custom autoloader based on Zend Framework's autoloading (related question here). The basic approach, taken from that question, is class My_Autoloader implements Zend_Loader_Autoloader_Interface { public function autoload($class) { // add your logic to find the required classes in here } } and then binding the new autoloader class to a class prefix. Now what I'm unsure about is how to handle errors inside the autoload method (for example, "class file not found") in a proper, ZF compliant way. I'm new to the framework, its conventions and style. Do I quietly return false and let the class creation process crash? Do I output an error or log message somehow (which would be nice to pinpoint the problem) and return false? If so, what is the Zend way of doing that? Do I trigger an error? Do I throw an exception? If so, what kind?

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• How to use a delay in a swing application

  - by M.R.

  I am building a swing application. At some point, I have to start an "animation": ... jpanel1.setBackground(Color.Black); Delay(milli) jpanel1.setBackground(Color.White); ... and so on. The gui itself and all the logic behind it work.It is just this time depended color-changing that does not. I have read, that swing is not thread safe, but all the examples I found showed me how to start another thread (for example in the background) but never how to stop the current swing-gui thread.

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• Second Unit Test Not Running

  - by TomJ

  I am having trouble getting my Method B test to run. The logic is fine, but when the unit tests are run, only Method A will run. If Method A and B are switched in terms of spots, only Method B will run. So clearly the code is wrong at some point. Do I need to call method B's test from inside method A in order to get both unit tests to run? I'm pretty new to C#, so forgive my basic question. using redacted; using Microsoft.VisualStudio.TestTools.UnitTesting; using System; namespace UnitTests { [TestClass()] public class ClassTest { public TestContext TestContext{get;set;} [TestMethod()] public void MethodATest() { the unit test } [TestMethod()] public void MethodBTest() { the unit test } } }

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• MySQL, return only rows where there are duplicates among two columns.

  - by Richard Waite

  I have a table in MySQL of contact information ; first name, last name, address, etc. I would like to run a query on this table that will return only rows with first and last name combinations which appear in the table more than once. I do not want to group the "duplicates" (which may only be duplicates of the first and last name, but not other information like address or birthdate) - I want to return all the "duplicate" rows so I can look over the results and determine if they are dupes or not. This seemed like it would be a simple thing to do, but it has not been. Every solution I can find either groups the dupes and gives me a count only (which is not useful for what I need to do with the results) or doesn't work at all. Is this kind of logic even possible in a query ? Should I try and do this in Python or something?

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• How to copy an object by value, not by reference

  - by Blankman

  I want to make a copy of an object, then after some logic, re-assign the original object the value of the copy. example: User userCopy = //make a copy foreach(...) { user.Age = 1; user.ID = -1; UserDao.Update(user) user = userCopy; } I don't want a copy by reference, it has to be a copy by value. The above is just a sample, not how I really want to use it but I need to learn how to copy by value.

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• Disable the Go button in the Keyboard for a UITextfield in iphone app.

  - by coder net

  Hi, My app has a screen where keyboard is always visible. The main element of the screen is a UITextfield. For easy data entering, keyboard is always made visible. When the user finishes entering data and hits Go, the app performs a 4,5 seconds action which is done in the background thread in order to show UIActivityIndicatorView. My problem is that the Go button on the keyboard still shows as enabled since the logic is performed in the background. The user could potentially hit the Go again causing it to run again. I am not able to set editable/userinteraction properties to No because then the keyboard disappears. Is there anyway just to disable the Go button or freeze the keyboard until the background thread returns?

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• save changes problem

  - by ognjenb

  // GET: /Transporter/Edit/5 public ActionResult Edit(int id) { var FilesQueryEdit = (from i in FilesEntities.transporter where i.Id == id select i).First(); return View(FilesQueryEdit); } // // POST: /Transporter/Edit/5 [HttpPost] public ActionResult Edit(int id, transporter trn) { try { // TODO: Add update logic here FilesEntities.AddTotransporter(trn); FilesEntities.SaveChanges(); return RedirectToAction("Transporters"); } catch { return View(); } } This code inserts new row after post edited data. How to modify post action result to save changes in edited row without inserting new row

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• add extra data to response object to render in template

  - by mp0int

  I ned to write a code sniplet that enables to disable connection to some parts of a site. Admin and the mainpage will be displayable, but user section (which uses ajax) will be displayed, but can not be used (vith a transparent div set over the page). Also there is a few pages which will be disabled. my logic is that, i write a middleware, def process_request(self, request): if ayar.tonline_kapali: url_parcalari = request.path.split('/') if url_parcalari[0] not in settings.BAGIMSIZ_URLLER: if not request.is_ajax(): return render_to_response('bakim_modu.html') else: return None that code let me to display a "site closed" message for the urls not in BAGIMSIZ_URLLER (which contains urls that will be accessible) But i do not figure out how can i solve the problem about ajax pages... i need to set a header or something to the response and need to check it in the template.

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• Why does UITableViewCell have a contentView property?

  - by mystify

  What's the point of this contentView property? I mean: Why aren't all the subviews just added to self? Let me get that right: Every cell is a view (UITabvleViewCell is a UIView subclass). And this fat view has another fat view with same bounds sitting on top of it, called contentView. That contentView then carries all those other subviews. Now why didn't they save that extra chunk of memory? Is there any genius logic behind this decision? Would love to understand the reason for this.

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