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  • does Entity Framework have a caching mechanism like DataSet/DataTables have?

    - by Greg
    Hi, does Entity Framework have a caching mechanism like DataSet/DataTables have? In other words if you start using EF is it really just a way to easily get data in/out of the database without providing an additional caching layer like DataSet/DataTables did where you have an in-memory representation (on-line/off-line) and which at some point you could say to "persist all changes to database"

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  • ComboBox wpf not item not being selected

    - by Greg R
    I am trying to bind a combo box to a list of objects, and it works great, besides the selected value, am I missing somethign? <ComboBox ItemsSource="{Binding OrderInfoVm.AllCountries}" SelectedValuePath="country_code" DisplayMemberPath="country_name" SelectedValue="{Binding OrderInfoVm.BillingCountry}" /> Basically I want to bind value to country codes and set the selected value to the country code bound to OrderInfoVm.BillingCountry (which implements INotifyPropertyChanged) Initially when the control loads selected value is empty, but on click BillingCountry is populated. Selected value does not seem to change. How can I remedy that?

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  • Why does a user have to enter "Profile" data to enter data into other tables?

    - by Greg McNulty
    EDIT It appears the user has to enter some data for his profile, otherwise I get this error below. I guess if there is no profile data, the user can not continue to enter data in other tables by default? I do not want to make entering user profile data a requirement to use the rest of the sites functionality, how can I get around this? Currently I have been testing everything with the same user and everything has been working fine. However, when I created a new user for the very first time and tried to enter data into my custom table, I get the following error. The INSERT statement conflicted with the FOREIGN KEY constraint "FK_UserData_aspnet_Profile". The conflict occurred in database "C:\ISTATE\APP_DATA\ASPNETDB.MDF", table "dbo.aspnet_Profile", column 'UserId'. The statement has been terminated. Not sure why I am getting this error. I have the user controls set up in ASP.NET 3.5 however all I am using is my own table or at least that I am aware of. I have a custom UserData table that includes the columns: id, UserProfileID, CL, LL, SL, DateTime (id is the auto incremented int) The intent is that all users will add their data in this table and as I mentioned above it has been working fine for my original first user I created. However, when i created a new user I am getting this problem. Here is the code that updates the database. protected void Button1_Click(object sender, EventArgs e) { //connect to database MySqlConnection database = new MySqlConnection(); database.CreateConn(); //create command object Command = new SqlCommand(queryString, database.Connection); //add parameters. used to prevent sql injection Command.Parameters.Add("@UID", SqlDbType.UniqueIdentifier); Command.Parameters["@UID"].Value = Membership.GetUser().ProviderUserKey; Command.Parameters.Add("@CL", SqlDbType.Int); Command.Parameters["@CL"].Value = InCL.Text; Command.Parameters.Add("@LL", SqlDbType.Int); Command.Parameters["@LL"].Value = InLL.Text; Command.Parameters.Add("@SL", SqlDbType.Int); Command.Parameters["@SL"].Value = InSL.Text; Command.ExecuteNonQuery(); } Source Error: Line 84: Command.ExecuteNonQuery();

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  • Silverlight with Visual Studio 2010 Isolated Storage Error

    - by Greg Finzer
    I am getting an error when trying to access isolated storage when running a Silverlight unit test project in VS2010. Test method Silverlight_Binary_Serialization_Tests.SerializationTests.SerializeBytesTest threw exception: System.IO.IsolatedStorage.IsolatedStorageException: Unable to determine application identity of the caller. Here is the line it is failing on: private readonly IsolatedStorageFile _store = IsolatedStorageFile.GetUserStoreForApplication();

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  • Problem with multiple event handling in JQuery

    - by Greg
    Hi everyone, I have a strange jquery problem with multiple event handlers. What I'm trying to achieve is this: User selects some text on the page If the selection is not empty - show a context menu If user clicks somewhere else - the context menu should disappear I'm having troubles with the above i.e. sometimes the context menu appears correctly, sometimes it appears and disappears straight after user makes a selection. Please help. See the relevant parts of my code below. Also when user selects a paragraph or a word by double clicking - context menu appears and quickly disappears again. var ContextMenu = { ... show: function(e) { var z = this; if (!this.shown) { if (this.contextMenu) { this.contextMenu.css({ left: e.pageX, top: e.pageY }).slideDown('fast'); this.shown = true; } var hideHandler = function() { z.hide(this); }; $(document.body).bind("click", hideHandler); } }, hide: function(hideHandler) { if (this.contextMenu && this.shown) { this.contextMenu.slideUp('fast'); this.shown = false; $(document.body).unbind("click", hideHandler); } } }; // Context menu display logic $(document.body).bind("mousedown mouseup", function(e) { if ((window.getSelection().toString() != "") && (!ContextMenu.shown)) { ContextMenu.show(e); } });

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  • Any hosted versions of jQuery that have the 'Access-Control-Allow-Origin: *' header set?

    - by Greg Bray
    I have been working with jQuery recently and ran into a problem where I couldn't include it in a userscript because xmlhttpRequest uses the same origin policy. After further testing I found that most browsers also support the Cross-Origin Resource Sharing access control defined by W3C as a workaround for issues with same origin policy. I tested this by hosting the jQuery script on a local web server that included the Access-Control-Allow-Origin: * http header, which allowed the script to be downloaded using xmlhttpRequest so that it could be included in my userscript. I'd like to use a hosted version of jQuery when releasing the script, but so far testing with tools like http://www.seoconsultants.com/tools/headers I have not found any sites that allow cross-origin access to the jQuery script. Here is the list I have tested so far: http://www.asp.net/ajaxlibrary/CDN.ashx http://code.google.com/apis/ajaxlibs/documentation/index.html#jquery http://docs.jquery.com/Downloading_jQuery#CDN_Hosted_jQuery Are there any other hosted versions of jQuery that do allow cross origin access?

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  • How do you traverse and store XML in Blackberry Java app?

    - by Greg
    I'm having a problem accessing the contents of an XML document. My goal is this: Take an XML source and parse it into a fair equivalent of an associative array, then store it as a persistable object. the xml is pretty simple: <root> <element> <category_id>1</category_id> <name>Cars</name> </element> <element> <category_id>2</category_id> <name>Boats</name> </element> </root> Basic java class below. I'm pretty much just calling save(xml) after http response above. Yes, the xml is properly formatted. import java.io.IOException; import java.util.Hashtable; import org.w3c.dom.Document; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import java.util.Vector; import net.rim.device.api.system.PersistentObject; import net.rim.device.api.system.PersistentStore; import net.rim.device.api.xml.parsers.DocumentBuilder; import net.rim.device.api.xml.parsers.DocumentBuilderFactory; public class database{ private static PersistentObject storeVenue; static final long key = 0x2ba5f8081f7ef332L; public Hashtable hashtable; public Vector venue_list; String _node,_element; public database() { storeVenue = PersistentStore.getPersistentObject(key); } public void save(Document xml) { venue_list = new Vector(); storeVenue.setContents(venue_list); Hashtable categories = new Hashtable(); try{ DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory. newInstance(); DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder(); docBuilder.isValidating(); xml.getDocumentElement ().normalize (); NodeList list=xml.getElementsByTagName("*"); _node=new String(); _element = new String(); for (int i=0;i<list.getLength();i++){ Node value=list.item(i).getChildNodes().item(0); _node=list.item(i).getNodeName(); _element=value.getNodeValue(); categories.put(_element, _node); } } catch (Exception e){ System.out.println(e.toString()); } venue_list.addElement(categories); storeVenue.commit(); } The code above is the work in progress, and is most likely heavily flawed. However, I have been at this for days now. I can never seem to get all child nodes, or the name / value pair. When I print out the vector as a string, I usually end up with results like this: [{ = root, = element}] and that's it. No "category_id", no "name" Ideally, I would end up with something like [{1 = cars, 2 = boats}] Any help is appreciated. Thanks

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  • UIImagePickerController image editing not working

    - by Greg Reichow
    I am having a problem with implementing UIImagePickerController. When the controller loads, it displays modally, and allows the user to select the image. Good so far. Yet, then when it moves to the editing phase, it often displays somewhat corrupted view (the image cropping box is halfway off the top of the screen) and their is no image. It does not crash, but all UI interaction is blocked. The strange part is that this only happens when I compile with Release settings. Under debug compile settings, the image editing works fine! I have tried checking for memory warnings during this time, but none are showing up. Here is the code calling the image picker controller for reference. When I use the camera (the first method), it always works fine. It is just when selecting images from the Library (called from the second method below) does it fail as described above. And again, only on release build, and with various different types of images. - (IBAction) showCameraController:(id)sender { self.imagePicker =[[UIImagePickerController alloc] init]; self.imagePicker.sourceType=UIImagePickerControllerSourceTypeCamera; self.imagePicker.delegate=self; self.imagePicker.allowsEditing=YES; [self presentModalViewController:self.imagePicker animated:YES]; } - (IBAction) showPictureAlbumController:(id)sender { self.imagePicker =[[UIImagePickerController alloc] init]; self.imagePicker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary; self.imagePicker.delegate=self; self.imagePicker.allowsEditing=YES; [self presentModalViewController:self.imagePicker animated:YES]; } The delegate methods are properly implemented, yet, during the problem I am describing, the controller is not yet calling those methods. It is failing when displaying the editing screen before the user is able to select cancel or save. It is just locking up with no crash. Please help!

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  • Detect file creation date on iPhone OS?

    - by Greg Maletic
    I was planning on writing some code whose logic was based upon testing the creation date of a particular file in my app's Documents folder. Turns out, when I call -[NSFileManager attributesOfItemAtPath:error:], NSFileCreationDate isn't one of the provided attributes. Is there no way to discover a file's creation date? Thanks.

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  • How do I export a PFX Code Signing Key to SPC and PVK under Windows 7?

    - by Greg Finzer
    I have a code signing key in PFX format that I need to export into SPC and PVK files. I tried to install the OpenSSL from Shining light but the install fails under Windows 7. http://www.shininglightpro.com/products/Win32OpenSSL.html Here are the instructions I am using from Comodo as a basis: https://support.comodo.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=1089 Anyone know of an alternate way to do this?

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  • Rails Enterprise Edition crashes in gc_sweep

    - by Greg
    My Rails application crashes intermittently with the following message: /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/multibyte/utils.rb:52: [BUG] gc_sweep(): unknown data type 0x0(0xbdc2ca0) ruby 1.8.7 (2009-12-24 patchlevel 248) [i686-linux], MBARI 0x8770, Ruby Enterprise Edition 2010.01 I am running the app on Nginx / Passenger. Ruby 1.8.7, Rails Enterprise Edition 2.3.5, Ubuntu 9.10 32bit. Does anybody have an idea how to fix this?

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  • How Do I Programmatically Set a File Tag

    - by Greg Bishop
    When using Windows Explorer to view files, I'm given the option to set a "tag", "category", or other attributes. For a JPEG a different set of attributes (including "tag") are options. I'd like to be able to set these programmatically. How do I programmatically set a file tag and other file attributes using Delphi (I have Delphi 2010 Pro)?

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  • Proper way to implement IXmlSerializable?

    - by Greg
    Once a programmer decides to implement IXmlSerializable, what are the rules and best practices for implementing it? I've heard that GetSchema() should return null and ReadXml should move to the next element before returning. Are these true? And what about WriteXml: should it write a root element for the object or is it assumed that the root is already written? How should child objects be treated and written. Here's a sample of what I have now. I'll update it as I get good responses. public class Calendar: IEnumerable<Gvent>, IXmlSerializable { public XmlSchema GetSchema() { return null; } public void ReadXml(XmlReader reader) { if (reader.MoveToContent() == XmlNodeType.Element && reader.LocalName == "Calendar") { _Name = reader["Name"]; _Enabled = Boolean.Parse(reader["Enabled"]); _Color = Color.FromArgb(Int32.Parse(reader["Color"])); if (reader.ReadToDescendant("Event")) { while (reader.MoveToContent() == XmlNodeType.Element && reader.LocalName == "Event") { var evt = new Event(); evt.ReadXml(reader); _Events.Add(evt); } } reader.Read(); } } public void WriteXml(XmlWriter writer) { writer.WriteAttributeString("Name", _Name); writer.WriteAttributeString("Enabled", _Enabled.ToString()); writer.WriteAttributeString("Color", _Color.ToArgb().ToString()); foreach (var evt in _Events) { writer.WriteStartElement("Event"); evt.WriteXml(writer); writer.WriteEndElement(); } } } public class Event : IXmlSerializable { public XmlSchema GetSchema() { return null; } public void ReadXml(XmlReader reader) { if (reader.MoveToContent() == XmlNodeType.Element && reader.LocalName == "Event") { _Title = reader["Title"]; _Start = DateTime.FromBinary(Int64.Parse(reader["Start"])); _Stop = DateTime.FromBinary(Int64.Parse(reader["Stop"])); reader.Read(); } } public void WriteXml(XmlWriter writer) { writer.WriteAttributeString("Title", _Title); writer.WriteAttributeString("Start", _Start.ToBinary().ToString()); writer.WriteAttributeString("Stop", _Stop.ToBinary().ToString()); } }

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  • MS SQL Bridge Table Constraints

    - by greg
    Greetings - I have a table of Articles and a table of Categories. An Article can be used in many Categories, so I have created a table of ArticleCategories like this: BridgeID int (PK) ArticleID int CategoryID int Now, I want to create constraints/relationships such that the ArticleID-CategoryID combinations are unique AND that the IDs must exist in the respective primary key tables (Articles and Categories). I have tried using both VS2008 Server Explorer and Enterprise Manager (SQL-2005) to create the FK relationships, but the results always prevent Duplicate ArticleIDs in the bridge table, even though the CategoryID is different. I am pretty sure I am doing something obviously wrong, but I appear to have a mental block at this point. Can anyone tell me please how should this be done? Greaty appreciated!

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  • Modulo operator in Objective-C returns the wrong result

    - by Greg Maletic
    I'm a little freaked out by the results I'm getting when I do modulo arithmetic in Objective-C. -1 % 3 is coming out to be -1, which isn't the right answer: according to my understanding, it should be 2. -2 % 3 is coming out to -2, which also isn't right: it should be 1. Is there another method I should be using besides the % operator to get the correct result?

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  • Rails: keeping DRY with ActiveRecord models that share similar complex attributes

    - by Greg
    This seems like it should have a straightforward answer, but after much time on Google and SO I can't find it. It might be a case of missing the right keywords. In my RoR application I have several models that share a specific kind of string attribute that has special validation and other functionality. The closest similar example I can think of is a string that represents a URL. This leads to a lot of duplication in the models (and even more duplication in the unit tests), but I'm not sure how to make it more DRY. I can think of several possible directions... create a plugin along the lines of the "validates_url_format_of" plugin, but that would only make the validations DRY give this special string its own model, but this seems like a very heavy solution create a ruby class for this special string, but how do I get ActiveRecord to associate this class with the model attribute that is a string in the db Number 3 seems the most reasonable, but I can't figure out how to extend ActiveRecord to handle anything other than the base data types. Any pointers? Finally, if there is a way to do this, where in the folder hierarchy would you put the new class that is not a model? Many thanks.

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  • iPhone: Set the title of a UIButton with a single method invocation?

    - by Greg Maletic
    I'd like to set the title of a UIButton via code. I find myself having to call -[UIButton setTitle:forState:] for UIControlStateNormal, UIControlStateHighlighted, UIControlStateDisabled, UIControlStateSelected. And that doesn't even take into account all of the combinations of these states together. Needless to say, this is tiresome. Is there a single call I can make that will set one string as the title for all of the states? (Since, I assume that in 95% of the cases, that's the desired behavior?)

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  • CATiledLayer blanking tiles before drawing contents

    - by Greg Plesur
    All, I'm having trouble getting behavior that I want from CATiledLayer. Is there a way that I can trigger the tiles to redraw without having the side-effect that their areas are cleared to white first? I've already subclassed CATiledLayer to set fadeDuration to return 0. To be more specific, here are the details of what I'm seeing and what I'm trying to achieve: I have a UIScrollView with a big content size...~12000x800. Its content view is a UIView backed by a CATiledLayer. The UIView is rendered with a lot of custom-drawn lines Everything works fine, but the contents of the UIView sometimes change. When that happens, I'd like to redraw the tiles as seamlessly as possible. When I use setNeedsDisplay on the view, the tiles redraw but they are first cleared to white and there's a fraction-of-a-second delay before the new content is drawn. I've already subclassed CATiledLayer so that fadeDuration is set to 0. The behavior that I want seems like it should be possible...when you zoom in on the scrollview and the content gets redrawn at a higher resolution, there's no blanking before the redraw; the new content is drawn right on top of the old one. That's what I'm looking for. Thanks; I appreciate your ideas. Update: Just to follow up - I realized that the tiles weren't being cleared to white before the redraw, they're being taken out entirely; the white that I was seeing is the color of the view that's beneath my CATiledLayer-backed view. As a quick hack/fix, I put a UIImageView beneath the UIScrollView, and before triggering a redraw of the CATiledLayer-backed view I render its visible section into the UIImageView and let it show. This smooths out the redraw significantly. If anyone has a better solution, like keeping the redraw-targeted tiles from going away before being redrawn in the first place, I'd still love to hear it.

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  • Any sample C# project that highlights separate data access layer (using EF) to business logic layer

    - by Greg
    Hi, I'm interested in having a look at a small sample project that would highlight a good technique to separate data access layer (using Entity Framework) to business logic layer. In C# would be good. That is, it would highlight how to pass data between the layer without coupling them. That is, the assumption here is not to use the EF classes in the Business Logic layer, and how to achieve this low coupling, but minimizing plumbing code.

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  • Example of configuring wxStyledTextCtrl/wxScintilla control as code editor for custom language

    - by Greg
    How do you enable actions like Goto line number Find(/Replace) There don't appear to be default triggers for these actions. There are a bunch of methods on the control, but I'm missing the first step of how to get the 'events' that would trigger these. For instance, how does one hook ctrl+f or F3/Alt+F3 in the control and make them do a find? Should I be looking at each key using EVT_STC_KEY? Would also like any examples of using this control with Custom language definition (say something similar to C++, but not C++) Auto completion (basic keywords to start, or including variables)

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  • How do you mark class with TypeConverter that is not in referenced solution?

    - by Greg McGuffey
    I have a class that I've written a TypeConverter for. I want to keep the TypeConverter separate from the main solution, as it is only needed at design time and have an extensibility project now that contains the TypeConverter. Thus, when I deploy, I don't need to deploy the extensibility assembly at all. However, I can't figure out the appropriate string to use in the attribute to actually connect the class to the converter. Note I can't use this: [TypeConverter(typeof(MyConverter)] because MyConverter is in a project that isn't referenced. I need to use the string overload, but can't figure out what to use: [TypeConverter("what the heck goes in here!")] I think I need maybe a path to the assembly, maybe a GUID, the class name...just not sure...

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  • Navigate between screens in WPF

    - by Greg R
    This should be a very basic design question, but for some reason it doesn't seem to be well documented (maybe due to its simplicity?). If I'm building a dashboard application in WPF that brig up different CRM tasks and I want to navigate between screens, is this the best way to do this, or is there a better way? So for example I have Log In Screen - Main Menu Screen - Screen to one of different utilities var orderManagerWindow = new MyXamlView(); var loginWindow = Application.Current.MainWindow; orderManagerWindow.Left = loginWindow.Left; orderManagerWindow.Top = loginWindow.Top; Application.Current.MainWindow = orderManagerWindow; orderManagerWindow.Show(); loginWindow.Close(); I would really appreciate help and suggestions!

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  • Real-time wmv video encoding in C#

    - by Greg Roberts
    How to encode video on the fly and send it trough the network from C#? Can't find a suitable library. I need to encode in WMV and don't mind if the actual encoding is made in C++ as long as the library has a .NET assembly available. Thanks

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