The issue with your code The problem with the above approach is that if you forget releasing the connection after every single time you perform getDb you have a resource leak that might freeze your app eventually when it runs out of the resource you’re leaking. You might, in one place do: var users = … Read more
The fact that you need to ensure that the object is disposed indicates a design flaw. It’s fine if disposing is the polite or efficient thing to do, but it should not be semantically necessary. There is no way to enforce that an object is disposed of via the using statement. However, what you can … Read more
I struggled with this problem and found the example here to be very helpful. I’ll post the code for a quick view: using (Stream stream = new FileStream(“file.txt”, FileMode.OpenOrCreate)) { using (StreamWriter writer = new StreamWriter(stream)) { // Use the writer object… } } Replace the outer using statement with a try/finally making sure to … Read more
The static variable of your class are not garbage collected until the app domain hosting your class is unloaded. The Dispose() method will not be called, because it is an instance method, and you said that you wouldn’t create any instances of your class. If you would like to make use of the Dispose() method, … Read more
IDisposable has nothing to do with freeing memory. IDisposable is a pattern for freeing unmanaged resources — and memory is quite definitely a managed resource. The links pointing to GC.Collect() are the correct answer, though use of this function is generally discouraged by the Microsoft .NET documentation. Edit: Having earned a substantial amount of karma … Read more
When you add non-UI components to the form (such as a Timer component), components will be the parent of those compoments. The code in the designer file makes sure that these components are disposed of when the form is disposed. If you have not added any such components to the form in design time, components … Read more
The full pattern including a finalizer, introduction of a new virtual method and “sealing” of the original dispose method is very general purpose, covering all bases. Unless you have direct handles on unmanaged resources (which should be almost never) you don’t need a finalizer. If you seal your class (and my views on sealing classes … Read more
It seems like this is by (the very dumb) design. You must have this exception thrown and caught in your code. MSDN looks silent about it indeed, but if you look at the documentation of another asynchronous socket method, BeginConnect(), here’s what we find: To cancel a pending call to the BeginConnect() method, close the … Read more
Generally speaking you should always dispose of disposable resources. I certainly would be looking to in the case you outline above. If you implement IDisposable on the class that implements the timer you can then use the class in a using statement, meaning resources will be explicitly released when your class is disposed.
I assume the problem is caused by the response from the server arrives after the widget is disposed. Check if the widget is mounted before you call setState. This should prevent the error you are seeing: // Before calling setState check if the state is mounted. if (mounted) { setState (() => _noDataText=”No Data”); }