[mono-android] Reflection - Cannot find default constructor

[Andrew Sinclair]

Willem,

 

This sounds like another variant of the "you need PreserveAttribute on your
constructor" that was mentioned earlier on today (see thread about
Activator.CreateInstance, excerpt from Jon's reply below)

 

Andy

-----

You're missing a [Android.Runtime.PreserveAttribute] on your constructor.

 

My apologies, as we need to better document this, but Mono for Android is
following the design of MonoTouch here:

 

      http://monotouch.net/Documentation/API_Design#PreserveAttribute

 

 

From: monodroid-bounces at lists.ximian.com
[mailto:monodroid-bounces at lists.ximian.com] On Behalf Of Willem Meints
Sent: 25 March 2011 12:51
To: monodroid at lists.ximian.com
Subject: [mono-android] Reflection - Cannot find default constructor

 

Hi,

 

Before I start firing up a browser and send a bugreport about this it's
probably a good idea to check with you guys first. 

 

The problem I'm experiencing is that the Newton JSON library cannot find a
default constructor on a type I'm trying to deserialize. Since it works fine
on other platforms I thought that it might be a problem with MonoDroid
behaving incorrectly. So here's what I've tried:

 

Type type = typeof(IdentityProviderInformation);

ConstructorInfo constructor = type.GetConstructor(BindingFlags.Public |
BindingFlags.Instance,null,new Type[0], null);

 

if(constructor != null)

{

  Log.Info("MyApp","Constructor found");

}

 

The result is that the app doesn't find the constructor and doesn't print
the message into the log. The type has a default constructor, so it should
find it.

 

Can someone confirm this behavior?

 

Best regards,

 

Willem Meints

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