#INSTAL THE NEW FOR IOS SQLPRO STUDIO UPDATE#

What the event is doing doesn’t really matter. In this case, we have a window which subscribes to the dispatcherTimer_Tick event when opened. To demonstrate the insight, we will do a walkthrough debugging of a sample WPF app to find an event handler leak:įigure 3: Sample code of a WPF application This is where the Memory Analyzer can come in and help developers fix these issues. The trivial solution here is to simply call the unsubscribe method, but in more complex applications, it is difficult to track an object’s subscriptions and when to unsubscribe. The issue with this is that if Subscriber forgets to unsubscribe, these references remain on the heap, thus leaking Subscriber. When Subscriber calls Subscribe(publisher), MyEvent will link Publisher and Subscriber in the heap: In this example, we have a Publisher and Subscriber class. This is because event handlers create a direct reference between an object and the event it has subscribed to.įigure 1: UML of pub/sub model with events in C# Event handlers are notorious for causing this scenario. This means that it will unintentionally remain alive in memory. What is an Event Handler Leak?Īn object leaks on the heap when it is functionally out of use, but not identified for Garbage Collection. It provides information on which objects are leaking and the event it subscribed to.

#INSTAL THE NEW FOR IOS SQLPRO STUDIO UPDATE#

The new insight added to the Visual Studio Managed Memory Usage Tool introduced in update 17.9 Preview 1 significantly trivializes the process of spotting/fixing these leaks.

Additionally, they are quite difficult to spot and even trickier to fix.

You might be thinking: What makes event handler leaks so important? Event handler leaks are easy to cause, all it takes is to forget to unsubscribe to an event. Event handler leaks have been around for a long time, and they are one of the peskiest issues WPF (Windows Presentation Foundation) developers regularly deal with.

Instal the new for ios SQLPro Studio