ArgumentNullException

[radu]

I’m trying to create and bind a blackboard property. I have a view called GuardView which has this

public bool HeroVisible { get; private set; }

Once I add a bool blackboard property and bind it to this HeroVisible property and try to run the project, I get this:

ArgumentNullException: Argument cannot be null.
Parameter name: method
System.Delegate.CreateDelegate (System.Type type, System.Object firstArgument, System.Reflection.MethodInfo method, Boolean throwOnBindFailure) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System/Delegate.cs:173)
System.Delegate.CreateDelegate (System.Type type, System.Object firstArgument, System.Reflection.MethodInfo method) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System/Delegate.cs:276)
NodeCanvas.NCReflection.NCCreateDelegate (System.Reflection.MethodInfo method, System.Type type, System.Object instance) (at Assets/NodeCanvas/Core/Other/NCReflection.cs:252)
NodeCanvas.NCReflection.NCCreateDelegate[Action1] (System.Reflection.MethodInfo method, System.Object instance) (at Assets/NodeCanvas/Core/Other/NCReflection.cs:245)
NodeCanvas.Variables.VariableData1[System.Boolean].InitBinding (UnityEngine.GameObject go) (at Assets/NodeCanvas/Core/Blackboard/VariableData.cs:121)
NodeCanvas.Blackboard.Awake () (at Assets/NodeCanvas/Core/Blackboard/Blackboard.cs:137)

For now I’m using ScriptControl->CheckProperty instead of BlackBoard->CheckBoolean as a workaround.

Am I missing something?

[Gavalakis]

Hello,

I wasn’t checking for whether or not the accessor is private. Here is the fix.

Please replace VariableData.cs InitBinding method at line #111 with the following:

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///Set the gameobject target for property binding. public override void InitBinding(GameObject go){ if (hasBinding && Application.isPlaying){ getter = null; setter = null; var arr = _propertyPath.Split('.'); var comp = go.GetComponent( arr[0] ); if (comp != null){ var prop = comp.GetType().NCGetProperty(arr[1]); if (prop != null){ if (prop.CanRead){ MethodInfo getMethod = null; #if NETFX_CORE getMethod = prop.GetMethod; #else getMethod = prop.GetGetMethod(); #endif if (getMethod != null){ getter = getMethod.NCCreateDelegate<System.Func<T>>(comp); } else { Debug.Log(string.Format("Binded Property '{0}' on '{1}' get accessor is private. Get binding ignored", prop.Name, comp.GetType().Name)); } } if (prop.CanWrite){ MethodInfo setMethod = null; #if NETFX_CORE setMethod = prop.SetMethod; #else setMethod = prop.GetSetMethod(); #endif if (setMethod != null){ setter = setMethod.NCCreateDelegate<System.Action<T>>(comp); } else { Debug.Log(string.Format("Binded Property '{0}' on '{1}' set accessor is private. Set binding ignored", prop.Name, comp.GetType().Name)); } } } } } }

Cheers!

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