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  • Bad idea to have the same object, have a different side effect after method call.

    - by Nathan W
    Hi all, I'm having a bit of a gesign issue(again). Say I have this Buttonpad object: now this object is a wrapper object over one in a com object. At the moment it has a method on it called CreateInto(IComObject). Now to make a new button pad in the Com Object. You do: ButtonPad pad = new ButtonPad(); pad.Title = "Hello"; // Set some more properties. pad.CreateInto(Cominstance); The createinfo method will excute the right commands to buid the button pad in the com object. After it has been created it any calls against it are foward to the underlying object for change so: pad.Title = "New title"; will call the com object to set the title and also set the internal title variable. Basically any calls before the CreateInfo method only affect the .NET object anything after has the side effect of calling the com object also. I'm not very good at sequence diagrams but here is my attempt to explain whats going on: This doesn't feel good to me, it feels like I'm lying to the user about what the button pad does. I was going to have a object called WrappedButtonPad, which is returned from CreateInto and the user could make calls against that to make changes to the Com Object, but I feel having two objects that almost do the same thing but only differ by names might be even worse. Are these valid designs, or am I right to be worried? How else would you handle a object the can create and query a com object?

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  • 2 bucks for !! java basic question

    - by Max
    How can I get a specific value from an object? I'm trying to get a value of an instance for eg. ListOfPpl newListOfPpl = new ListOfPpl(id, name, age); Object item = newListOfPpl; How can I get a value of name from an Object item?? Even if it is easy or does not interest you can anyone help me?? Edited: I was trying to build a binary tree contains the node of ListOfPpl, and need to sort it in the lexicographic. Here's my code for insertion on the node. Any clue?? public void insert(Object item){ Node current = root; Node follow = null; if(!isEmpty()){ root = new Node(item, null, null); return; }boolean left = false, right = false; while(current != null){ follow = current; left = false; right = false; //I need to compare and sort it if(item.compareTo(current.getFighter()) < 0){ current = current.getLeft(); left = true; }else { current = current.getRight(); right = true; } }if(left) follow.setLeft(new Node(item, null, null)); else follow.setRight(new Node(item, null, null)); }

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  • What else I must do allow my method to handle any type of objects

    - by NewHelpNeeder
    So to allow any type object I must use generics in my code. I have rewrote this method to do so, but then when I create an object, for example Milk, it won't let me pass it to my method. Ether there's something wrong with my generic revision, or Milk object I created is not good. How should I pass my object correctly and add it to linked list? This is a method that causes error when I insert an item: public void insertFirst(T dd) // insert at front of list { Link newLink = new Link(dd); // make new link if( isEmpty() ) // if empty list, last = newLink; // newLink <-- last else first.previous = newLink; // newLink <-- old first newLink.next = first; // newLink --> old first first = newLink; // first --> newLink } This is my class I try to insert into linked list: class Milk { String brand; double size; double price; Milk(String a, double b, double c) { brand = a; size = b; price = c; } } This is test method to insert the data: public static void main(String[] args) { // make a new list DoublyLinkedList theList = new DoublyLinkedList(); // this causes: // The method insertFirst(Comparable) in the type DoublyLinkedList is not applicable for the arguments (Milk) theList.insertFirst(new Milk("brand", 1, 2)); // insert at front theList.displayForward(); // display list forward theList.displayBackward(); // display list backward } // end main() } // end class DoublyLinkedApp Declarations: class Link<T extends Comparable<T>> {} class DoublyLinkedList<T extends Comparable<T>> {}

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  • LitJSON's JsonMapper.ToJson error: Max allowed object depth reached while trying to export from type

    - by dev.e.loper
    I have an object that I would like to convert to json inside one of the object's methods. I'm using LitJson library. Like so: protected override void Render(HtmlTextWriter writer) { ... writer.AddAttribute(HtmlTextWriterAttribute.Value, JsonMapper.ToJson(this)); .... } However JsonMapper.ToJson(this) produces a server error "Max allowed object depth reached while trying to export from type System.Drawing.Color". My guess is that because its trying to convert an object inside itself its going into some kind of infinite loop. Just curious what is actually happening.

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  • (Database Design - products attributes): What is better option for product attribute database design

    - by meyosef
    Hi, I new in database design. What is better option for product attribute database design for cms?(Please suggest other options also). option 1: 1 table products{ id product_name color price attribute_name1 attribute_value1 attribute_name2 attribute_value2 attribute_name3 attribute_value3 } option 2: 3 tables products{ id product_name color price } attribute{ id name value } products_attribute{ products_id attribute_id } Thanks, Yosef

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  • OO design - car rental

    - by gkid123
    AnHow would you implement the following car hierarchy along with the accessor functions and a CarRental class which contains the container to store them? A car rental company wants to keep track of its cars. Each vehicle has a license plate and a brand. Currently the company has SUV and Sedans. SUV have an optional third row seat, sedan’s have an optional sport package. Each car can be queried to inquire the number of passengers it can carry.

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  • Error converting JSON to .Net object in asp.net

    - by Vinni
    Hello Guys, I am unable to convert JSON string to .net object in asp.net. I am sending JSON string from client to server using hidden field (by keeping the JSON object.Tostring() in hidden field and reading the hidden field value in code behind file) Json string/ Object: [[{"OfferId":"1","OrderValue":"11","HostingTypeID":"3"}, {"OfferId":"1","OrderValue":"11","HostingTypeID":"3"}, {"OfferId":"1","OrderValue":"11","HostingTypeID":"3"}, {"OfferId":"1","OrderValue":"2","HostingTypeID":"3"}, {"OfferId":"1","OrderValue":"2","HostingTypeID":"3"}, {"OfferId":"1","OrderValue":"67","HostingTypeID":"3"}, {"OfferId":"1","OrderValue":"67","HostingTypeID":"3"}], [{"OfferId":"1","OrderValue":"99","HostingTypeID":"6"}], [{"OfferId":"1","OrderValue":"10","HostingTypeID":"8"}]] .Net Object public class JsonFeaturedOffer { public string OfferId { get; set; } public string OrderValue { get; set; } public string HostingTypeID { get; set; } } Converstion code in code behind file byte[] byteArray = Encoding.ASCII.GetBytes(HdnJsonData.Value); MemoryStream stream = new MemoryStream(byteArray); DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(JsonFeaturedOffer)); object result= serializer.ReadObject(stream); JsonFeaturedOffer jsonObj = result as JsonFeaturedOffer; While converting i am getting following error: Expecting element 'root' from namespace ''.. Encountered 'None' with name '', namespace ''.

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  • Help with a compiler warning: Initialization from distinct Objective-C type when types match

    - by Alex Gosselin
    Here is the function where I get the compiler warning, I can't seem to figure out what is causing it. Any help is appreciated. -(void)displaySelector{ //warning on the following line: InstanceSelectorViewController *controller = [[InstanceSelectorViewController alloc] initWithCreator:self]; [self.navController pushViewController:controller animated:YES]; [controller release]; } Interface and implementation for the initWithCreator: method -(InstanceSelectorViewController*)initWithCreator:(InstanceCreator*)creator; -(InstanceSelectorViewController*)initWithCreator:(InstanceCreator*)crt{ if (self = [self initWithNibName:@"InstanceSelectorViewController" bundle:nil]) { creator = crt; } return self; }

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  • Reattaching an object graph to an EntityContext: "cannot track multiple objects with the same key"

    - by dkr88
    Can EF really be this bad? Maybe... Let's say I have a fully loaded, disconnected object graph that looks like this: myReport = {Report} {ReportEdit {User: "JohnDoe"}} {ReportEdit {User: "JohnDoe"}} Basically a report with 2 edits that were done by the same user. And then I do this: EntityContext.Attach(myReport); InvalidOperationException: An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key. Why? Because the EF is trying to attach the {User: "JohnDoe"} entity TWICE. This will work: myReport = {Report} {ReportEdit {User: "JohnDoe"}} EntityContext.Attach(myReport); No problems here because the {User: "JohnDoe"} entity only appears in the object graph once. What's more, since you can't control how the EF attaches an entity, there is no way to stop it from attaching the entire object graph. So really if you want to reattach a complex entity that contains more than one reference to the same entity... well, good luck. At least that's how it looks to me. Any comments? UPDATE: Added sample code: // Load the report Report theReport; using (var context1 = new TestEntities()) { context1.Reports.MergeOption = MergeOption.NoTracking; theReport = (from r in context1.Reports.Include("ReportEdits.User") where r.Id == reportId select r).First(); } // theReport looks like this: // {Report[Id=1]} // {ReportEdit[Id=1] {User[Id=1,Name="John Doe"]} // {ReportEdit[Id=2] {User[Id=1,Name="John Doe"]} // Try to re-attach the report object graph using (var context2 = new TestEntities()) { context2.Attach(theReport); // InvalidOperationException }

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  • C# How to add an entry to LDAP with multiple object classes

    - by Jarmo
    I'm trying to create a new user record into OpenLDAP with object classes person and uidObject. The problem seems to be that with System.DirectoryServices.DirectoryEntry I've found only a way to add a new entry with one object class, but not a way to add multiple object classes. This C# code DirectoryEntry nRoot = new DirectoryEntry(path); nRoot.AuthenticationType = AuthenticationTypes.None; nRoot.Username = username; nRoot.Password = pwd; try { DirectoryEntry newUser = nRoot.Children.Add("CN=" + "test", "person"); newUser.Properties["cn"].Add("test"); newUser.Properties["sn"].Add("test"); newUser.Properties["objectClass"].Add("uidObject"); // this doesnt't make a difference newUser.Properties["uid"].Add("testlogin"); // this causes trouble newUser.CommitChanges(); } catch (COMException ex) { Console.WriteLine(ex.ErrorCode + "\t" + ex.Message); } ...results in error: -2147016684 The requested operation did not satisfy one or more constraints associated with the class of the object. (Exception from HRESULT: 0x80072014)

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  • What topic in computer science is this?

    - by jasonbogd
    Hi, I am trying to figure out what 'topic' this is called, so I can learn more about it. Basically, I'm talking about designing my applications's architecture. I'm not talking about algorithms. More like -- this class should have these methods and these instance variables, and communicate with this class in this way, this class should have these responsibilities etc. Can anybody tell me what the name of this topic is called and how I can get better at doing this? Thanks.

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  • How to delete child object in NHibernate?

    - by Mark Struzinski
    I have a parent object which has a one to many relationship with an IList of child objects. What is the best way to delete the child objects? I am not deleting the parent. My parent object contains an IList of child objects. Here is the mapping for the one to many relationship: <bag name="Tiers" cascade="all"> <key column="mismatch_id_no" /> <one-to-many class="TGR_BL.PromoTier,TGR_BL"/> </bag> If I try to remove all objects from the collection using clear(), then call SaveOrUpdate(), I get this exception: System.Data.SqlClient.SqlException: Cannot insert the value NULL into column If I try to delete the child objects individually then remove them from the parent, I get an exception: deleted object would be re-saved by cascade This is my first time dealing with deleting child objects in NHibernate. What am I doing wrong? edit: Just to clarify - I'm NOT trying to delete the parent object, just the child objects. I have the relationship set up as a one to many on the parent. Do I also need to create a many-to-one relationship on the child object mapping?

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  • Single Table Inheritance (Database Inheritance design options) pros and cons and in which case it us

    - by Yosef
    Hi, I study about today about 2 database design inheritance approaches: 1. Single Table Inheritance 2. Class Table Inheritance In my student opinion Single Table Inheritance make database more smaller vs other approaches because she use only 1 table. But i read that the more favorite approach is Class Table Inheritance according Bill Karwin. My Question is: Single Table Inheritance pros and cons and in which case it used? thanks, Yosef

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  • JS onclick triggers wrong object

    - by Clemens Prerovsky
    Hi guys, what I'm trying to do here is to associate a DOM object with an instance of a JS object, which will provide some meaningfol methods later on ;) At this point I just want to handle my JS object the click event, whilst keeping it's references intact. <?xml version="1.0" encoding="ISO-8859-1" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> <title>Insert title here</title> <script type="text/javascript"> // my object, which will hold a reference to a single DOM object obj = function(domobj) { this.o = domobj; my = this; var ref = my.click; this.o.onclick = ref; } // my objects click function obj.prototype.click = function() { alert(my.o.innerHTML); } // create objects with references $(document).ready(function() { o1 = new obj(document.getElementById('b1')); o2 = new obj(document.getElementById('b2')); }); </script> </head> <body> <button id="b1">button 1</button> <button id="b2">button 2</button> </body> </html> Expected result: when clicking on button 1, the text "button 1" should be alerted. Current result: when clicking button 1, the text "button 2" is alerted. What I found out so far is that the wrong instance of obj is triggered from the click event, even though o1 and o2 maintain correct references to their corresponding DOM object. Any ideas how to solve this? Thanks for your help! Best regards, Clemens

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  • Objective C for beginners

    - by Golfgod130
    I was just asked to talk about Objective C to a bunch of High School student for 20 minutes. They have no experience with programming at all. What topics should I cover? Should I define vocab such as Method, Class, Variable? Or should I do something else? Any comments are helpful!

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  • Dealloc on my custom objective-C

    - by VansFannel
    Hello. I'm developing an iPhone application, and I very new on iPhone development. I've created some custom classes with instance variables (NSArray, NSString, etc.). All classes inherits from NSObject. Should I create a dealloc method to release all instance variables? Thank you.

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  • Modelling class realtions

    - by phenevo
    Hi, I have a few classes: Article: Content, ID, Magazine: Name Code, And 3 tables in database: Articles, Magazines and ArticlesinMagazines (two fields: IDArticle and CodeMagazine) In App, I've got module to manage Articles, and datagridview to relate their with magazines DataGridView has twofields: MagazineCode, IsPublished. The same article can be in many magazines (1:n) How would you implement on model ? Article have to has a field : List ?? I concern because Magazine associates articles

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  • Derived class linker - is this wrong?

    - by bobobobo
    We have this situation: A B ^ ^ | / C so class A { } class B { } class C : public A, public B { } Now, B wants to access a property in C. How do you do this? The solution I came up with is to place a pointer in B to an instance of C, which is only active (not null) if this B is in fact a C.

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  • Fluent interface design and code smell

    - by Jiho Han
    public class StepClause { public NamedStepClause Action1() {} public NamedStepClause Action2() {} } public class NamedStepClause : StepClause { public StepClause Step(string name) {} } Basically, I want to be able to do something like this: var workflow = new Workflow().Configure() .Action1() .Step("abc").Action2() .Action2() .Step("def").Action1(); So, some "steps" are named and some are not. The thing I do not like is that the StepClause has knowledge of its derived class NamedStepClause. I tried a couple of things to make this sit better with me. I tried to move things out to interfaces but then the problem just moved from the concrete to the interfaces - INamedStepClause still need to derive from IStepClause and IStepClause needs to return INamedStepClause to be able to call Step(). I could also make Step() part of a completely separate type. Then we do not have this problem and we'd have: var workflow = new Workflow().Configure() .Step().Action1() .Step("abc").Action2() .Step().Action2() .Step("def").Action1(); Which is ok but I'd like to make the step-naming optional if possible. I found this other post on SO here which looks interesting and promising. What are your opinions? I'd think the original solution is completely unacceptable or is it? By the way, those action methods will take predicates and functors and I don't think I want to take an additional parameter for naming the step there. The point of it all is, for me, is to only define these action methods in one place and one place only. So the solutions from the referenced link using generics and extension methods seem to be the best approaches so far.

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  • 2D colliding n-body simulation (fast Collision Detection for large number of balls)

    - by osgx
    Hello I want to write a program for simulating a motion of high number (N = 1000 - 10^5 and more) of bodies (circles) on 2D plane. All bodies have equal size and the only force between them is elastic collision. I want to get something like but in larger scale, with more balls and more dense filling of the plane (not a gas model as here, but smth like boiling water model). So I want a fast method of detection that ball number i does have any other ball on its path within 2*radius+V*delta_t distance. I don't want to do a full search of collision with N balls for each of i ball. (This search will be N^2.) PS Sorry for loop-animated GIF. Just press Esc to stop it. (Will not work in Chrome).

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  • Windows Form: showing child object value in the DataGridView

    - by Daoming Yang
    I have a productVariant object which has child product object. I want to show the value in the DataGridView, can anyone let me know how to do this? Here is the structure of the object. I tried to bind "ProductVariant.Product.Name" to the DataProptertyName in the DataGridView, however, it did not not showing any value. Can anyone help with this? Many thanks.

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