dispose

问题 When my stateless widget built I play some sounds in sequence order by using this code: await _audioPlayer.play(contentPath1, isLocal: true); await Future.delayed(Duration(seconds: 4)); await _audioPlayer.play(contentPath2, isLocal: true); await Future.delayed(Duration(seconds: 4)); await _audioPlayer.play(contentPath3, isLocal: true); when the user closes the current widget before finish playing the sounds, The sounds still work even after closing the current route by using this code:

问题 Is Close() same as Dispose() or using statement. Is it necessary to call using statement even if Close is called?. I know before disposing of an object, close should be called, so we close the resource and may it available to Dispose . https://msdn.microsoft.com/en-us/library/aa355056(v=vs.110).aspx says Close is same as Dispose . 回答1: Close() has no relation to IDisposable interface, see: https://msdn.microsoft.com/en-us/library/system.idisposable(v=vs.110).aspx using only applies to

问题 Is Close() same as Dispose() or using statement. Is it necessary to call using statement even if Close is called?. I know before disposing of an object, close should be called, so we close the resource and may it available to Dispose . https://msdn.microsoft.com/en-us/library/aa355056(v=vs.110).aspx says Close is same as Dispose . 回答1: Close() has no relation to IDisposable interface, see: https://msdn.microsoft.com/en-us/library/system.idisposable(v=vs.110).aspx using only applies to

问题 Is Close() same as Dispose() or using statement. Is it necessary to call using statement even if Close is called?. I know before disposing of an object, close should be called, so we close the resource and may it available to Dispose . https://msdn.microsoft.com/en-us/library/aa355056(v=vs.110).aspx says Close is same as Dispose . 回答1: Close() has no relation to IDisposable interface, see: https://msdn.microsoft.com/en-us/library/system.idisposable(v=vs.110).aspx using only applies to

问题 Let's say I have a class that has a MyCustomDatabaseAccess as a data member. MyCustomDatabaseAccess has a Dispose() method. MyCustomDatabaseAccess is the middleware class that accesses the database. public class MyClass { private MyCustomDatabaseAccess db_access; } Does MyClass need to implement IDisposable interface? My solution right now is to have do something like this: public class MyClass { private MyCustomDatabaseAccess db_access; public void GetDBResults () { db_access = new

问题 When can i cleanup objects stored in static variables in C#? I have a static variable that is lazily initialized: public class Sqm { private static Lazy<Sqm> _default = new Lazy<Sqm>(); public static Sqm Default { get { return _default.Value; } } } Note : That i've just changed Foo to be a static class. It doesn't change the question in any way if Foo is static or not. But some people are convinced that there is no way that an instance of Sqm could be constructed without first constructing an

问题 The start of story is here. I have a component and I want it to clean up timers (managed resources, right?): public class MyPictureBox : PictureBox, IDisposable { private Timer _timer1 = new Timer(); private Timer _timer2 = new Timer(); public MyPictureBox(): base() { _timer1.Interval = 100; _timer1.Start(); _timer2.Interval = 250; _timer2.Start(); } // ... all sort of code new void Dispose() { base.Dispose(); _timer1.Dispose(); _timer2.Dispose(); } void IDisposable.Dispose() { _timer1

问题 What is better, the using directive, or the dispose directive when finished with an object? using(FileStream fileStream = new FileStream( "logs/myapp.log", FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) { using(StreamReader streamReader = new StreamReader(fileStream)) { this.textBoxLogs.Text = streamReader.ReadToEnd(); } } On the other hand, when I'm dealing with System.Net.Mail, I'm told I need to Dispose() of the object to release any stray locks. Is there any consistent guidance?

问题 I've had a suspicion that a database connection used in one of our applications is not always closed. I went to see the code and I've found a class DataProvider that has SqlConnection object. The connection is opened in the constructor of this class and closed in it's Dispose method (don't judge that, I know keeping an open connection is evil, it's just not my code and it's not the point of the question anyway). The Dispose method is implemented like this: protected virtual void Dispose(bool

问题 I have this code :- using (System.Security.Cryptography.SHA256 sha2 = new System.Security.Cryptography.SHA256Managed()) { .. } Do I need to put this line of code, just BEFORE I leave that dispose scope .. or does the dispose 'call' that already. sha2.Clear(); 回答1: Since AFAIK the Clear() method just calls Dispose, the using block should be enough to ensure that the resources used are released. 回答2: IMHO if calling Dispose() is not enough to dispose off an object then either there is a serious