Reactive Extensions bug on Windows Phone
Compiled with VS 2012 , with project type WP 8.0 the following code will fail if debugger is not attached.
Somehow, if debugger not attached, compiler optimizations ruins the code inside Crash() - see comments in code.
Tested on Lumia 1520 (8.1) and Lumia 630 (8.0) .
Any ideas why this is occurring?
public partial class MainPage : PhoneApplicationPage
{
public MainPage()
{
InitializeComponent();
Button.Tap += (sender, args) => new A<B, string>(new B(), "string").Crash();
}
}
public class B
{
public void Foo<T>(T val) { }
}
public class A<T1, T2> where T1 : B
{
private T1 _t1;
private T2 _t2;
public A(T1 t1, T2 t2)
{
_t2 = t2;
_t1 = t1;
}
public void Crash()
{
var obs = Observable.Return(_t2);
obs.Subscribe(result =>
{
//CLR is expecting T2 to be System.String here,
//but somehow, after passing through Observable
//T2 here is not a string, it's A<T1, T2>
new List<T2>().Add(result);
});
//Will run normally if commented
_t1.Foo(new object());
}
}
_t1.Foo<type>(type);
You are missing the type declaration. The compiler is guessing (and guessing wrong). Strictly type everything and it should run.
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