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  • Data binding manually update in WPF MVVM

    - by Benny
    My ViewModel: class ViewModel { public string FileName {get;set;} } and in my View I bind a label's content to ViewModel's FileName. now When I do drag-drop a file to my View, How can I update the label's Content property, so that the ViewMode's FileName also get updated via binding? Directly set the label's Content property won't work, it just simply clear the binding.

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  • LINQ: why does this query not work on an ArrayList?

    - by Benny
    public static ArrayList GetStudentAsArrayList() { ArrayList students = new ArrayList { new Student() { RollNumber = 1,Name ="Alex " , Section = 1 ,HostelNumber=1 }, new Student() { RollNumber = 2,Name ="Jonty " , Section = 2 ,HostelNumber=2 } }; return students; } The following code doesn't compile. The error is ArrayList is not IEnumerable ArrayList lstStudents = GetStudentAsArrayList(); var res = from r in lstStudents select r; This compiles: ArrayList lstStudents = GetStudentAsArrayList(); var res = from Student r in lstStudents select r; Can anybody explain what the difference is between these two snippets? Why the second works?

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  • Java CORBA Client Disconnects Immediately

    - by Benny
    I have built a Java CORBA application that subscribes to an event server. The application narrows and logs on just fine, but as soon as an event is sent to the client, it breaks with the error below. Please advise. 2010/04/25!13.00.00!E00555!enserver!EventServiceIF_i.cpp!655!PID(7390)!enserver - e._info=system exception, ID 'IDL:omg.org/CORBA/TRANSIENT:1.0' TAO exception, minor code = 54410093 (invocation connect failed; ECONNRESET), completed = NO EDIT: Please note, this only happens when running on some machines. It works on some, but not others. Even on the same platform (I've tried Windows XP/7 and CentOS linux) Some work, some don't... Here is the WireShark output...looks like the working PC is much more interactive with the network compared to the non-working PC. Working PC No. Time Source Destination Protocol Info 62 28.837255 10.10.10.209 10.10.10.250 TCP 50169 > 23120 [SYN] Seq=0 Win=8192 Len=0 MSS=1260 WS=8 63 28.907068 fe80::5de0:8d21:937e:c649 ff02::1:3 LLMNR Standard query A isatap 64 28.907166 10.10.10.209 224.0.0.252 LLMNR Standard query A isatap 65 29.107259 10.10.10.209 10.255.255.255 NBNS Name query NB ISATAP<00> 66 29.227000 10.10.10.250 10.10.10.209 TCP 23120 > 50169 [SYN, ACK] Seq=0 Ack=1 Win=32768 Len=0 MSS=1260 WS=0 67 29.227032 10.10.10.209 10.10.10.250 TCP 50169 > 23120 [ACK] Seq=1 Ack=1 Win=66560 Len=0 68 29.238063 10.10.10.209 10.10.10.250 GIOP GIOP 1.1 Request s=326 id=5 (two-way): op=logon 69 29.291765 10.10.10.250 10.10.10.209 GIOP GIOP 1.1 Reply s=420 id=5: No Exception 70 29.301395 10.10.10.209 10.10.10.250 GIOP GIOP 1.1 Request s=369 id=6 (two-way): op=registerEventStat 71 29.348275 10.10.10.250 10.10.10.209 GIOP GIOP 1.1 Reply s=60 id=6: No Exception 72 29.405250 10.10.10.209 10.10.10.250 TCP 50170 > telnet [SYN] Seq=0 Win=8192 Len=0 MSS=1260 WS=8 73 29.446055 10.10.10.250 10.10.10.209 TCP telnet > 50170 [SYN, ACK] Seq=0 Ack=1 Win=32768 Len=0 MSS=1260 WS=0 74 29.446128 10.10.10.209 10.10.10.250 TCP 50170 > telnet [ACK] Seq=1 Ack=1 Win=66560 Len=0 75 29.452021 10.10.10.209 10.10.10.250 TELNET Telnet Data ... 76 29.483537 10.10.10.250 10.10.10.209 TELNET Telnet Data ... 77 29.483651 10.10.10.209 10.10.10.250 TELNET Telnet Data ... 78 29.523463 10.10.10.250 10.10.10.209 TCP telnet > 50170 [ACK] Seq=4 Ack=5 Win=32768 Len=0 79 29.554954 10.10.10.209 10.10.10.250 TCP 50169 > 23120 [ACK] Seq=720 Ack=505 Win=66048 Len=0 Non-working PC No. Time Source Destination Protocol Info 1 0.000000 10.10.10.209 10.10.10.250 TCP 64161 > 23120 [SYN] Seq=0 Win=8192 Len=0 MSS=1260 WS=8 2 2.999847 10.10.10.209 10.10.10.250 TCP 64161 > 23120 [SYN] Seq=0 Win=8192 Len=0 MSS=1260 WS=8 3 4.540773 Cisco_3c:78:00 Cisco-Li_55:87:72 ARP Who has 10.0.0.1? Tell 10.10.10.209 4 4.540843 Cisco-Li_55:87:72 Cisco_3c:78:00 ARP 10.0.0.1 is at 00:1a:70:55:87:72 5 8.992284 10.10.10.209 10.10.10.250 TCP 64161 > 23120 [SYN] Seq=0 Win=8192 Len=0 MSS=1260

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  • string <-> int/float conversion pain in .net winform

    - by Benny
    the Text property of control on winform is always string type, so if i wanna expose property of other type for custom control, i have to do the conversion as following, if i have dozens of properties to expose, it will be such pain for me. public int ImageGroupLength { get { return int.Parse(this.imageGroupLength.Text); } set { this.imageGroupLength.Text = value.ToString(); } } so, is there any elegant way to do the conversion?

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  • Silverlight Socket Constantly Returns With Empty Buffer

    - by Benny
    I am using Silverlight to interact with a proxy application that I have developed but, without the proxy sending a message to the Silverlight application, it executes the receive completed handler with an empty buffer ('\0's). Is there something I'm doing wrong? It is causing a major memory leak. this._rawBuffer = new Byte[this.BUFFER_SIZE]; SocketAsyncEventArgs receiveArgs = new SocketAsyncEventArgs(); receiveArgs.SetBuffer(_rawBuffer, 0, _rawBuffer.Length); receiveArgs.Completed += new EventHandler<SocketAsyncEventArgs>(ReceiveComplete); this._client.ReceiveAsync(receiveArgs); if (args.SocketError == SocketError.Success && args.LastOperation == SocketAsyncOperation.Receive) { // Read the current bytes from the stream buffer int bytesRecieved = this._client.ReceiveBufferSize; // If there are bytes to process else the connection is lost if (bytesRecieved > 0) { try { //Find out what we just received string messagePart = UTF8Encoding.UTF8.GetString(_rawBuffer, 0, _rawBuffer.GetLength(0)); //Take out any trailing empty characters from the message messagePart = messagePart.Replace('\0'.ToString(), ""); //Concatenate our current message with any leftovers from previous receipts string fullMessage = _theRest + messagePart; int seperator; //While the index of the seperator (LINE_END defined & initiated as private member) while ((seperator = fullMessage.IndexOf((char)Messages.MessageSeperator.Terminator)) > 0) { //Pull out the first message available (up to the seperator index string message = fullMessage.Substring(0, seperator); //Queue up our new message _messageQueue.Enqueue(message); //Take out our line end character fullMessage = fullMessage.Remove(0, seperator + 1); } //Save whatever was NOT a full message to the private variable used to store the rest _theRest = fullMessage; //Empty the queue of messages if there are any while (this._messageQueue.Count > 0) { ... } } catch (Exception e) { throw e; } // Wait for a new message if (this._isClosing != true) Receive(); } } Thanks in advance.

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  • Running Java CORBA Client on Unix

    - by Benny
    I'm trying to run a Java application I wrote to subscribe to a CORBA event service. It runs OK on my Windows machine, but as soon as I deploy it to the UNIX server, it gives me an org.omg.CORBA.NO_IMPLEMENT exception. Any ideas as to why this might be happening? I'm using JacORB on my Windows machine and passing VM arguments to initialize the client ORB, but I'm not sure how to do that on UNIX and if it's even necessary. Thanks in advance!

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  • How do I return a nested table from an oracle function using Java?

    - by Benny
    I have the following type declaration and Oracle function: CREATE OR REPLACE TYPE var_outcomes_results IS TABLE OF VARCHAR2(80); CREATE OR REPLACE FUNCTION getValuesAbove(in_nodeID IN table1.KEY_SL%TYPE, in_variable IN VARCHAR2) RETURN var_outcomes_results IS currentID table1.KEY_SL%TYPE; results var_outcomes_results; currentIndex integer := 0; BEGIN currentID := in_nodeID; WHILE currentID != null LOOP FOR outcomeRecord IN (select distinct a.PARENT, b.NAME, c.OUTCOME from table1 a left outer join table2 b on a.KEY_SL = b.KEY_SL left outer join table3 c on b.VAR_ID = c.VAR_ID where a.KEY_SL = currentID) LOOP currentID := outcomeRecord.PARENT; IF lower(outcomeRecord.NAME) = lower(in_variable) AND outcomeRecord.OUTCOME != null THEN currentIndex := currentIndex + 1; results(currentIndex) := outcomeRecord.OUTCOME; END IF; END LOOP; END LOOP; RETURN results; END; I have the following Java function: public List<Object> getAboveValues(String variable, Integer nodeID) { Connection connection = null; CallableStatement callableStatement = null; try { connection = dataSource.getConnection(); callableStatement = connection.prepareCall("begin ? := getValuesAbove(?,?); end;"); callableStatement.registerOutParameter(1, OracleTypes.ARRAY); callableStatement.setInt(2, nodeID); callableStatement.setString(3, variable); callableStatement.execute(); System.out.println(callableStatement.getObject(1)); } catch( SQLException e ) { logger.error("An Exception was thrown in getAboveValues: " + e); } finally { closeDataResources(callableStatement, connection); } } However, when I execute the function, I get the following error message: "ORA-03115: unsupported network datatype or representation" What am I doing wrong? Any ideas/suggestions would be appreciated. Thanks, B.J.

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  • LINQ to group objects according to timestamp

    - by Benny
    I have a serial of object defined as: public class Foo { public DateTime Time {get;set;} } now I want to group objects(IEnumerable<Foo>) according to the time, e.g. I want to group them according to hour or day or month. for example (group into hour): group 1(13:00-14:00) : foo1, foo2, foo3 group 2(14:00-15:00): foo4, foo5 How to write LINQ over this? hope I made myself clear.

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  • Silverlight 4 IN Browser Socket

    - by Benny
    I need to use a TCP socket connecting to a port outside of 4502-4532 while running in browser. I know it is possible to do out of browser with allowing full access, but how can I do it inside the browser? I am connecting to an old Unix system so I would prefer not to host a web site hosting a clientaccesspolicy.xml file. Thanks in advance!

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  • Ajax request using mootools not working

    - by benny
    Hi everyone, I try loading content into a div with this tutorial. Unfortunately, this simply loads the HTML file as a new page. This is the javascript that should do the job window.addEvent('domready', function() {      $('runAjax').addEvent('click', function(event) {          event.stop();          var req = new Request({              method: 'get',              url: $('runAjax').get('href'),              data: { 'do' : '1' },              onRequest: function() { alert('The request has been made, please wait until it has finished.'); },   onComplete: function(response) { alert('Response received.); $('container').set('html', response); }          }).send(); $('runAjax').removeEvent('click');      }); }); this is the link that should initiate the function <a href="about.html" id="runAjax" class="panel">Profil</a> and this is the div-structure of index.html. i want the content to be loaded into the "container"-div <div id="view"> <div id="sidebar"> mib </div> <div id="container"> <div id="logo"> <!--img src="img/logo.png"--> </div> <div align="center" id="tagline"> content </div> </div> </div> I dont really care what script i use as long as its compatible with MooTools 1.2, because i need it for a sliding top panel and it would be a lot more work to change it to a jquery panel for example.

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  • What's the order of execution in property setters when using IDataErrorInfo?

    - by Benny Jobigan
    Situation: Many times with WPF, we use INotifyPropertyChanged and IDataErrorInfo to enable binding and validation on our data objects. I've got a lot of properties that look like this: public SomeObject SomeData { get { return _SomeData; } set { _SomeData = value; OnPropertyChanged("SomeData"); } } Of course, I have an appropriate overridden IDataErrorInfo.this[] in my class to do validation. Question: In a binding situation, when does the validation code get executed? When is the property set? When is the setter code executed? What if the validation fails? For example: User enters new data. Binding writes data to property. Property set method is executed. Binding checks this[] for validation. If the data is invalid, the binding sets the property back to the old value. Property set method is executed again. This is important if you are adding "hooks" into the set method, like: public string PathToFile { get { return _PathToFile; } set { if (_PathToFile != value && // prevent unnecessary actions OnPathToFileChanging(value)) // allow subclasses to do something or stop the setter { _PathToFile = value; OnPathToFileChanged(); // allow subclasses to do something afterwards OnPropertyChanged("PathToFile"); } } }

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  • Convert Office Documents without Office

    - by Benny
    We are in need of converting all MS Office documents to PDF, TIF, or any similar image format with no loss in formatting (these are official documents that cannot have tampering). Is there any way to do this without installing Office on the machine that would do this? Ideally, this would go on a server and run multi-threaded without the overhead of Office Automation. Thanks in advance!

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  • With Maven, how would I prevent Maven from filtering certain properties but allowing others?

    - by Benny
    The problem is that I'm trying to build a project that has in its resources a build.xml file. Basically, I package my project as a jar with Maven2, and then use ant installer to install my project. There is a property in the build.xml file that I need to filter called build.date, but there are other properties that I don't want to filter, like ${basedir}, because it's used by the ant installer but gets replaced by Maven's basedir variable. So, I need to somehow tell Maven to filter ${build.date}, but not ${basedir}. I tried creating a properties file as a filter with "basedir=${basedir}" as one of the properties, but I get the following error: Resolving expression: '${basedir}': Detected the following recursive expression cycle: [basedir] Any suggestions would be much appreciated. Thanks, B.J.

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  • drag-drop and data binding in MVVM

    - by Benny
    My ViewModel: class ViewModel { public string FileName {get;set;} } and in my View I bind a label's content to ViewModel's FileName. now When I do drag-drop a file to my View, How can I update the label's Content property, so that the ViewMode's FileName also get updated via binding? Directly set the label's Content property won't work, it just simply clear the binding.

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  • How would MVVM be for games?

    - by Benny Jobigan
    Particularly for 2d games, and particularly silverlight/wpf games. If you think about it, you can divide a game object into its view (the graphic on the screen) and a view-model/model (the state, ai, and other data for the object). In silverlight, it seems common to make each object a user control, putting the model and view into a single object. I suppose the advantage of this is simplicity. But, perhaps it's less clean or has some disadvantages in terms of the underlying "game engine". What are your thoughts on this matter? What are some advantages and disadvantages of using the MVVM pattern for game development? How about performance? All thoughts are welcome.

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  • Asterisk TDM Out Channel Not Recording

    - by Benny
    I am trying to use the monitor command to record a TDM extension, but only the in chnnnel is being recorded. The out channel is 44 bytes and obviously no audio within. However, when monitoring a SIP or IAX phone, no problems exist. Is there some configuration I'm missing for distinguishing between TDM and SIP/IAX for recording? Thanks in advance!

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  • Help me understand Dispose() implementation code from MSDN

    - by Benny
    the following code is from MSDN: Idisposable pattern protected virtual void Dispose(bool disposing) { // If you need thread safety, use a lock around these // operations, as well as in your methods that use the resource. if (!_disposed) { if (disposing) { if (_resource != null) _resource.Dispose(); Console.WriteLine("Object disposed."); } // Indicate that the instance has been disposed. _resource = null; _disposed = true; } } why the following statement: _resource = null; _disposed = true; are not enclosed by if (disposing) statement block? for me i would probably write like this: if (disposing) { if (_resource != null) { _resource.Dispose(); _resource = null; _disposed = true; } Console.WriteLine("Object disposed."); } anything wrong with my version?

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