GetField from arbitrary value, not just scripts

[bcristian]

Hello

I’ve created an action to read a field from a variable of arbitrary type, not just scripts (MonoBehaviour’s) into a blackboard variable.
One for reading a property is very similar.
Handles the case of transforming an array to a BB list parameter.

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using System; using System.Collections.Generic; using System.Linq; using System.Reflection; using NodeCanvas.Framework; using NodeCanvas.Framework.Internal; using ParadoxNotion; using ParadoxNotion.Design; using UnityEngine;   namespace NodeCanvas.Tasks.Actions {       [Category("✫ Blackboard")]     [Description("Copy the value of a member to a blackboard variable")]     public class GetFieldFromValue : ActionTask     { [SerializeField]         BBObjectParameter from;           [SerializeField]         string fieldName;           [SerializeField]         [BlackboardOnly]         BBObjectParameter saveAs;           FieldInfo field;         bool arrayToList;         MethodInfo collectionClear;         MethodInfo collectionAdd;           protected override string info         {             get             {                 if (string.IsNullOrEmpty(fieldName))                     return "No Field Selected";                 return string.Format("{0} = {1}.{2}", saveAs.ToString(), from.ToString(), fieldName);             }         }           protected override string OnInit()         {             if (from.value == null)                 return "No input value";             field = from.varType.RTGetField(fieldName);             if (field == null)                 return "Missing Field: " + fieldName;               if (arrayToList = field.FieldType.IsArray)             {                 var elementType = field.FieldType.GetElementType();                 var collectionType = typeof(ICollection<>).RTMakeGenericType(elementType);                 collectionClear = collectionType.GetMethod("Clear");                 collectionAdd = collectionType.GetMethod("Add");             }               return null;         }           protected override void OnExecute()         {             if (arrayToList)             {                 collectionClear.Invoke(saveAs.value, null);                 var arr = field.GetValue(from.value) as Array;                 if (arr != null && arr.Length > 0)                 {                     var args = new System.Object[1];                     foreach (var item in arr)                     {                         args[0] = item;                         collectionAdd.Invoke(saveAs.value, args);                     }                 }             }             else             {                 saveAs.value = field.GetValue(from.value);             }             EndAction();         }           ////////////////////////////////////////         ///////////GUI AND EDITOR STUFF/////////         //////////////////////////////////////// #if UNITY_EDITOR           protected override void OnTaskInspectorGUI()         {               if (!Application.isPlaying && GUILayout.Button("Select Field"))             {                   System.Action<FieldInfo> FieldSelected = (field) => {                     from.SetType(field.DeclaringType);                     fieldName = field.Name;                     var targetType = field.FieldType;                     if (targetType.IsArray)                         targetType = typeof(List<>).RTMakeGenericType(targetType.GetElementType());                     saveAs.SetType(targetType);                 };                   var menu = new UnityEditor.GenericMenu();                 foreach (var t in UserTypePrefs.GetPreferedTypesList(typeof(System.Object), true))                     menu = EditorUtils.GetFieldSelectionMenu(t, typeof(object), FieldSelected, menu);                   if (Editor.NCPrefs.useBrowser)                     menu.ShowAsBrowser("Select Field", GetType());                 else                     menu.ShowAsContext();                   Event.current.Use();             }               if (!string.IsNullOrEmpty(fieldName))             {                 GUILayout.BeginVertical("box");                 UnityEditor.EditorGUILayout.LabelField("Type", from.varType.FriendlyName());                 UnityEditor.EditorGUILayout.LabelField("Field", fieldName);                 UnityEditor.EditorGUILayout.LabelField("Field Type", saveAs.varType.FriendlyName());                 GUILayout.EndVertical();                 EditorUtils.BBParameterField("From", from, false);                 EditorUtils.BBParameterField("Save As", saveAs, true);             }         }   #endif     } }

[Gavalakis]

That’s great!
Thanks a lot for sharing! 🙂

Join us on Discord: https://discord.gg/97q2Rjh

[bcristian]

oops, a bug slipped through…
line 81 should be:

saveAs.value = field.GetValue(from.value);

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