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• How to port C# code which uses a callback to VB.NET?

  - by Bob

  I need to port the following from the ASP.NET MVC 2 sourcecode from C# to VB.NET. It's from AuthorizeAttribute.cs beginning on line 86: HttpCachePolicyBase cachePolicy = filterContext.HttpContext.Response.Cache; cachePolicy.SetProxyMaxAge(new TimeSpan(0)); cachePolicy.AddValidationCallback(CacheValidateHandler, null /* data */); where CacheValidateHandler is: private void CacheValidateHandler(HttpContext context, object data, ref HttpValidationStatus validationStatus) { validationStatus = OnCacheAuthorization(new HttpContextWrapper(context)); } The VB.NET port from http://converter.telerik.com doesn't quite work for this line: cachePolicy.AddValidationCallback(CacheValidateHandler, Nothing) ' Error where CacheValidateHandler is: Private Sub CacheValidateHandler(ByVal context As HttpContext, ByVal data As Object, _ ByRef validationStatus As HttpValidationStatus) validationStatus = OnCacheAuthorization(New HttpContextWrapper(context)) End Sub VS2008 complains that CacheValidateHandler does not specify its arguments for context, data, and validationStatus. Any ideas how to port this code?

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• C++ Scoping and ambiguity in constructor overloads

  - by loarabia

  I've tried the following code snippet in 3 different compilers (G++, clang++, CL.exe) and they all report to me that they cannot disambiguate the overloaded constructors. Now, I know how I could modify the call to the constructor to make it pick one or the other (either make explicit that the second argument is a unsigned literal value or explicitly cast it). However, I'm curious why the compiler would be attempting to choose between constructors in the first place given that one of the constructors is private and the call to the constructor is happening in the main function which should be outside the class's scope. Can anyone enlighten me? class Test { private: Test(unsigned int a, unsigned int *b) { } public: Test(unsigned int a, unsigned int b) { } }; int main() { Test t1 = Test(1,0); // compiler is confused }

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• Why is my (Type).GetFields(BindingFlags.Instance | BindingFlags.Public) not working?

  - by granadaCoder

  My code can see the NonPublic members, but not the Public ones. (???) Full sample code below. FieldInfo[] publicFieldInfos = t.GetFields(BindingFlags.Instance | BindingFlags.Public); is returning nothing. Note, I'm trying to get at the properties on the abstract class as well as the 1 concrete class. (And read the attributes as well). I'm going bonkers on this one....the msdn example works with the 2 flags (BindingFlags.Instance | BindingFlags.Public).....but my mini inheritance example below is not. THANKS in advance. /////////////START CODE private void RunTest1() { try { textBox1.Text = string.Empty; Type t = typeof(MyInheritedClass); //Look at the BindingFlags *** NonPublic *** int fieldCount = 0; while (null != t) { fieldCount += t.GetFields(BindingFlags.Instance | BindingFlags.NonPublic).Length; FieldInfo[] nonPublicFieldInfos = t.GetFields(BindingFlags.Instance | BindingFlags.NonPublic); foreach (FieldInfo field in nonPublicFieldInfos) { if (null != field) { Console.WriteLine(field.Name); } } t = t.BaseType; } Console.WriteLine("\n\r------------------\n\r"); //Look at the BindingFlags *** Public *** t = typeof(MyInheritedClass); FieldInfo[] publicFieldInfos = t.GetFields(BindingFlags.Instance | BindingFlags.Public); foreach (FieldInfo field in publicFieldInfos) { if (null != field) { Console.WriteLine(field.Name); object[] attributes = field.GetCustomAttributes(t, true); if (attributes != null && attributes.Length > 0) { foreach (Attribute att in attributes) { Console.WriteLine(att.GetType().Name); } } } } } catch (Exception ex) { ReportException(ex); } } private void ReportException(Exception ex) { Exception innerException = ex; while (innerException != null) { Console.WriteLine(innerException.Message + System.Environment.NewLine + innerException.StackTrace + System.Environment.NewLine + System.Environment.NewLine); innerException = innerException.InnerException; } } public abstract class MySuperType { public MySuperType(string st) { this.STString = st; } public string STString { get; set; } public abstract string MyAbstractString {get;set;} } public class MyInheritedClass : MySuperType { public MyInheritedClass(string ic) : base(ic) { this.ICString = ic; } [Description("This is an important property"),Category("HowImportant")] public string ICString { get; set; } private string _oldSchoolPropertyString = string.Empty; public string OldSchoolPropertyString { get { return _oldSchoolPropertyString; } set { _oldSchoolPropertyString = value; } } [Description("This is a not so importarnt property"), Category("HowImportant")] public override string MyAbstractString { get; set; } }

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• does anyone see any issues with this thread pattern?

  - by prmatta

  Here is a simple thread pattern that I use when writing a class that needs just one thread, and needs to a specific task. The usual requirements for such a class are that it should be startable, stopable and restartable. Does anyone see any issues with this pattern that I use? public class MyThread implements Runnable { private boolean _exit = false; private Thread _thread = null; public void start () { if (_thread == null) { _thread = new Thread(this, "MyThread"); _thread.start(); } } public void run () { while (_exit) { //do something } } public void stop () { _exit = true; if (_thread != null) { _thread.interrupt(); _thread = null; } } } I am looking for comments around if I am missing something, or if there is a better way to write this.

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• How to create a generic C# method that can return either double or decimal?

  - by CrimsonX

  I have a method like this: private static double ComputePercentage(ushort level, ushort capacity) { double percentage; if(capacity == 1) percentage = 1; // do calculations... return percentage; } Is it possible to make it of a generic type like "type T" where it can return either decimal or double, depending on the type of method expected (or the type put into the function?) I tried something like this and I couldn't get it to work, because I cannot assign a number like "1" to a generic type. I also tried using the "where T :" after ushort capacity) but I still couldn't figure it out. private static T ComputePercentage<T>(ushort level, ushort capacity) { T percentage; if(capacity == 1) percentage = 1; // error here // do calculations... return percentage; } Is this even possible? I wasn't sure, but I thought this post might suggest that what I'm trying to do is just plain impossible.

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• C#, working with files, "Unauthorized Access"?

  - by Rob

  Hi, I'm learning about opening and saving files with C# and it seems that vista won't let my program save to a file on the root of C:\ , unless I run it in administrator mode. Any ideas how to allow my program to play around with whatever files it wants? Thanks! string name; private void button2_Click(object sender, EventArgs e) ///// OPEN ///// { if (openFileDialog1.ShowDialog() == DialogResult.OK) { name = openFileDialog1.FileName; textBox1.Clear(); textBox1.Text = File.ReadAllText(name); textBox2.Text = name; } } private void button1_Click(object sender, EventArgs e) ///// SAVE ///// { File.WriteAllText(name, textBox1.Text); }

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• Export Certificate Windows Server 2008

  - by user1432032

  I need to export the private key of a self-created SSL-certificate on a Windows Server 2008. However at Microsoft Management Console (the certificate is located, if it matter, in Personal-Certificate folder) the option "Yes, export the private key" is greyed out. Reading the provided help section it tells that the certificate needed to "be made exportable" during creation. However it also says that it is ONLY a limitation if it was created using Windows Server 2003. It doesn´t say anything how to fix it though on a Windows 2008 Server. The certificate is self-signed. I want to export to PKCS12 format. I´m accessing MMC as administrator so there should not be any permission issues. How can I make this certificate "exportable"?

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• MySqlConnection really not close

  - by stighy

  Hi guys, i've a huge problem. Take a look to this sample code private sub FUNCTION1() dim conn as new mysqlconnection(myconnstring) conn.open ---- do something FUNCTION2() ---- conn.close end sub private sub FUNCTION2() dim conn as new mysqlconnection(myconnstring) .... conn.open -- do something conn.close end sub Despite i close regulary all my connection, they remains "open" on the mysql server. I know this because i'm using MySQL Administration tool to check how many connection i open "line by line" of my source code. In fact i get a lot of time "user has exceeded the 'max_user_connections' resource (current value: 5)" My hoster permit ONLY 5 connection, but i think that if i write GOOD source code, this cannot be a problem. So my question is: why that "damn" connections remain open ?? Thank you in advance!

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• How to bind WPF TreeView to a List<Drink> programmatically?

  - by Joan Venge

  So I am very new to WPF and trying to bind or assign a list of Drink values to a wpf treeview, but don't know how to do that, and find it really hard to find anything online that just shows stuff without using xaml. struct Drink { public string Name { get; private set; } public int Popularity { get; private set; } public Drink ( string name, int popularity ) : this ( ) { this.Name = name; this.Popularity = popularity; } } List<Drink> coldDrinks = new List<Drink> ( ){ new Drink ( "Water", 1 ), new Drink ( "Fanta", 2 ), new Drink ( "Sprite", 3 ), new Drink ( "Coke", 4 ), new Drink ( "Milk", 5 ) }; } } How can I do this in code? For example: treeview1.DataItems = coldDrinks; and everything shows up in the treeview.

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• How can I put the results of Cursor into String[]. For more detail, please refer to the code below

  - by Hicen

  public class DisplayCustomersActivity extends Activity implements Button.OnClickListener { private SalesDB sdb; private ListView lvDCList; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.displaycustomers); lvDCList = (ListView) findViewById(R.id.lvDCList); sdb = new SalesDB(this); SQLiteDatabase db = sdb.getReadableDatabase(); Cursor results = db.query(sdb.TABLE_CUSTOMER, new String[] {sdb.CUSTOMER_ID, sdb.CUSTOMER_NAME, sdb.CUSTOMER_GENDER}, null, null, null, null, null); int resultCount = results.getCount(); String[] customers = new String[resultCount]; if (resultCount == 0 || !results.moveToFirst()) { customers = null; } else { for(int i=0; i<resultCount; i++) { //Process results to String array here ... ... results.moveToNext(); } } }

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• .net equivalent for php preg_replace

  - by Hath

  What is the c#.net equivalent for php's preg_replace function? php code is like this: const ALLOW_VALUES = '[^a-z0-9àáâäèéêëìíîïòóôöùûwýÿyÁÂÄÈÉÊËÌÎÏÒÓÔÖÙÛÜWYÝ]'; public function streetTownHash($data, $hashCheck = false, $updateRecord = false) { foreach($data as $key=>$value){ try{ $value = mb_convert_case($value, MB_CASE_LOWER, "UTF-8"); } catch(Exception $e) { echo "Requires extension=php_mbstring.dll enabled ! - $e"; } $valueConcat .= preg_replace('/'.self::ALLOW_VALUES.'/','',$value); # Remove punctuation etc } $streetTownHash = sha1($valueConcat); .... this is as far as i've got but not sure about it.. private SHA1 hash = SHA1.Create(); private string hashAllowed = "[^a-z0-9àáâäèéêëìíîïòóôöùûwýÿyÁÂÄÈÉÊËÌÎÏÒÓÔÖÙÛÜWYÝ]"; public string HashString(string value) { value = // = regex not sure this part var bytes = ASCIIEncoding.UTF8.GetBytes(value); var hashed = hash.ComputeHash(bytes); return ASCIIEncoding.UTF8.GetString(hashed); }

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• JPA: Database Generated columns

  - by jpanewbie

  Hello, I am facing an issue with Hiebrnate and JPA. My requirement is column CreatedDTTM and LastUPDATEDDTTM should be populated at the DB level. I have tried following but no use. My columns are set NOT NULL. I get a "cannot insert Null into LastUpdatedDttm" exception. Any guidance is appreciated. @Column(name="LAST_UPDATED_DTTM", insertable=false, updatable=false, columnDefinition="Date default SYSDATE") @org.hibernate.annotations.Generated(value=GenerationTime.INSERT) @Temporal(javax.persistence.TemporalType.DATE) private Date lastUpdDTTM; @Column(name="CREATED_DTTM”, insertable=false, updatable=false) @org.hibernate.annotations.Generated(value=GenerationTime.ALWAYS) @Temporal(javax.persistence.TemporalType.DATE) private Date createdDTTM;

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• Get the value of a selected java field in a eclipse view.

  - by user325489

  Hi, I making a eclipse view that is working with selected elements from other views. Let say I have opened a java file in the editor that has the following fields in it: private String world = " world!" private String hello = "hello" + world; When I select "hello" in the Outline view I'm able to get IFiled selection and I have access to it's properties, but what i need is the true value of the field ("hello world!"). Any idea how can I do that? Thanks.

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• How can I create an enum using numbers?

  - by Jordan S

  Is it possible to make an enum using just numbers in C#? In my program I have a variable, Gain, that can only be set to 1, 2, 4, and 8. I am using a propertygrid control to display and set this value. If I were to create an enum like this... private enum GainValues {One, Two, Four, Eight} and I made my gain variable of type GainValues then the drop-down list in the propertygrid would only show the available values for the gain variable. The problem is I want the gain values to read numerically an not as words. But I can not create an enum like this: private enum GainValues {1,2,4,8} So is there another way of doing this? Perhaps creating a custom type?

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• Full automatic application trace for .net v4

  - by JL

  I would like to implement a way to trace every line of code in an application that is written for .net v4.0. An example would be. If I had the following function. private bool hasValue(string value) { if(string.isnullorempty(value) { return false; } else { return true; }} Then when the function is called I want detailed trace logs to contain something like this: Function called |Line 10 |Signature private bool hasValue(string value)|ValuesPassed hasValue("") Line Evaluated | Line 11 | if(string.isnullorempty(value) |ValuesPassed if(string.isnullorempty("") - evaluation returned true entered line 13 |signature return false|return action taken. This tracing can be done manually, but its a lot of work, and would dirty the code. Isn't there a way to get this level of tracing automatically with .net or 3rd party plugin? Thank you

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• Object reference not set to an instance of an object

  - by Ste

  I have this function that create runtime textbox: int i = 0; private TextBox[] addressBox = new TextBox[100]; private void appendNewTab() { addressBox[i] = new TextBox(); addressBox[i].KeyPress += new KeyPressEventHandler(this.addressBox_KeyPress); i++; } void addressBox_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == (char)13) { MessageBox.Show(addressBox[i].Text); } } but i have Object reference not set to an instance of an object here MessageBox.Show(addressBox[i].Text); any suggestion?

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• How to test that action uses argument?

  - by Caster Troy

  I am supposed to be using test-driven development but in this particular case, as I am having trouble, I implemented the action method first. It looks like this: public ViewResult Index(int pageNumber = 1) { var posts = repository.All(); var model = new PagedList<Post>(posts, pageNumber, PageSize); return View(model); } Both the repository and the PagedList<> have been tested already. Now I want to verify that when the action is given a page number that the page number is actually considered. private Mock<IPostsRepository> repository; private HomeController controller; [Test] public void Index_Doohickey() { var actual = controller.Index(2); // .. How do I test that the controller actually uses the page number here? }

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• Constructors + Dependency Injection

  - by Sunny

  If I am writing up a class with more than 1 constructor parameter like: class A{ public A(Dependency1 d1, Dependency2 d2, ...){} } I usually create a "argument holder"-type of class like: class AArgs{ public Dependency1 d1 { get; private set; } public Dependency2 d2 { get; private set; } ... } and then: class A{ public A(AArgs args){} } Typically, using a DI-container I can configure the constructor for dependencies & resolve them & so there is minimum impact when the constructors need to change. Is this considered an anti-pattern and/or any arguments against doing this?

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• java: useful example of a shutdown hook?

  - by Jason S

  I'm trying to make sure my Java application takes reasonable steps to be robust, and part of that involves shutting down gracefully. I am reading about shutdown hooks and I don't actually get how to make use of them in practice. Is there a practical example out there? Let's say I had a really simple application like this one below, which writes numbers to a file, 10 to a line, in batches of 100, and I want to make sure a given batch finishes if the program is interrupted. I get how to register a shutdown hook but I have no idea how to integrate that into my application. Any suggestions? package com.example.test.concurrency; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.PrintWriter; public class GracefulShutdownTest1 { final private int N; final private File f; public GracefulShutdownTest1(File f, int N) { this.f=f; this.N = N; } public void run() { PrintWriter pw = null; try { FileOutputStream fos = new FileOutputStream(this.f); pw = new PrintWriter(fos); for (int i = 0; i < N; ++i) writeBatch(pw, i); } catch (FileNotFoundException e) { e.printStackTrace(); } finally { pw.close(); } } private void writeBatch(PrintWriter pw, int i) { for (int j = 0; j < 100; ++j) { int k = i*100+j; pw.write(Integer.toString(k)); if ((j+1)%10 == 0) pw.write('\n'); else pw.write(' '); } } static public void main(String[] args) { if (args.length < 2) { System.out.println("args = [file] [N] " +"where file = output filename, N=batch count"); } else { new GracefulShutdownTest1( new File(args[0]), Integer.parseInt(args[1]) ).run(); } } }

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• Is there an free (or cheap) issue tracking software that allow you hide some issues to some member g

  - by Andrea Francia

  I need a Issue Tracking System that allow me to share information on a selective manner. I would be able to define these groups: supplier (my company) subcontractors customer Then, I would be able to define three type of permissions for issues: Issue that can be viewed only by supplier Issue that can be viewed only by supplier and subcontractors Issue that can be viewed by all (supplier, subcontractors, customer) I tried redmine but I didn't find a way of hide some issues, they are always visible. There is an open issue and a patch for that but I not sure if it suit well for my situation. With this patch you need always to remember to make it private and there is only a level of permission: private or not. I need something more flexible. EDIT: I need a software that works on Fedora Linux.

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• How to get value from Java object

  - by JSF User

  I have this Java object private List<NewAccountObj> dataList; public class NewAccountObj { private int userid; public NewAccountObj(int userid) { this.userid = userid; } public int getUserid() { return userid; } public void setUserid(int userid) { this.userid = userid; } public List<NewAccountObj> getdataList() { return dataList; } What is the proper way to access a value from the object? Is this correct? <h:inputText id="userid" value="#{NewAccountController.dataList.userid}" validator="#{ValidatorAccountController.validateUserID}" autocomplete="off"> <f:ajax event="blur" render="useridvalidator" /> </h:inputText> Is there any other solution?

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• Problems with capturing an event in child object in Actionscript

  - by Raigomaru

  I have two classes. The first one (the starting class): package { import flash.display.Sprite; import flash.events.KeyboardEvent; import tetris.*; public class TetrisGame extends Sprite { private var _gameWell:Well; public function TetrisGame() { _gameWell = new Well(); addChild(_gameWell); } } } The second: package tetris { import flash.display.Sprite; import flash.events.KeyboardEvent; public class Well extends Sprite { public function Well() { super(); addEventListener(KeyboardEvent.KEY_DOWN, onKeyboard); } private function onKeyboard():void { //some code is here } } } But when I press any buttons on my keyboard, the child class Well doesn't have any reaction. What's the problem?

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• I cannot get mlocManager.removeUpdates(mlocListener); to work

  - by Colin

  I have an app that uses the LocationManage functions which works well until the app is stopped or paused. The location listener function is still carrying on in the background. Relevant bits of code follow. When I click home or back the onstop() function is being triggered correctly. package uk.cr.anchor; import android.app.Activity; import android.content.Context; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.media.MediaPlayer; import android.media.RingtoneManager; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.TableRow; import android.widget.Toast; import android.widget.ToggleButton; import android.content.SharedPreferences; import android.graphics.Color; public class main extends Activity { /** Called when the activity is first created. */ private LocationManager mlocManager; private LocationListener mlocListener; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); LocationManager mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); LocationListener mlocListener = new MyLocationListener(); mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener); } @Override protected void onStop(){ stoplistening(); super.onStop(); } /* Class My Location Listener */ public class MyLocationListener implements LocationListener { @Override public void onLocationChanged(Location loc) { loc.getLatitude(); loc.getLongitude(); etc etc etc } private void stoplistening() { if (mlocManager != null) { Toast.makeText( getApplicationContext(), "kill", Toast.LENGTH_SHORT ).show(); mlocManager.removeUpdates(mlocListener); } else { Toast.makeText( getApplicationContext(), " not kill", Toast.LENGTH_SHORT ).show(); } } } I always get the "not kill" message. Can anyone help me!

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• how to get the rate(top/ps) of cpu and the usage of memory?

  - by ben

  Can i do that? or It's a private API?

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• JPA Bidirectional OneToMany and ManyToOne?

  - by PhoenixJon

  I'm using Oracle JDeveloper 11g Release 2. I created two tables A and B using SQL developer. Table A has a FK to table B. Using the Entities from Tables function, I created two JPA files from it. A has @ManyToOne annotation on FK. And also B has @OneToMany annotation to A. I don't want this. Can I remove this @OneToMany annotation automatically? public class A implements Serializable { ... @ManyToOne @JoinColumn(name = "FIELD_B") private B b; ... } public class B implements Serializable { ... @OneToMany(mappedBy = "B") private List<A> assetList; ... } I don't need @OneToMany mapping.

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