The name `UnityEditor' does not exist in the current context

Questions & Answers
1

Hi there,

In one of my C# files I call the UnityEditor.EditorUtility.InstanceIDToObject() method.
When compiling and running in the editor everything runs fine, however, when I try to build to a windows stand-alone application I am presented with the error “The name `UnityEditor’ does not exist in the current context”

If I use the Unity Editor Name space instead,

Using UnityEditor;
EditorUtility.InstanceIDToObject()

Once again, works fine playing in the editor, stand alone build fails with error:
“The type or namespace name `UnityEditor’ could not be found. Are you missing a using directive or an assembly reference?”

UnityEditor.dll has been referenced in all of my visible MonoDevelop projects by default.

How do we fix this problem?

2

The UnityEditor assembly isn’t packaged up with a built out project, it’s 100% for Unity’s IDE or editor.

wrap your usings and methods from UnityEngine with a compiler directive.

Example:

#if UNITY_EDITOR
using UnityEditor;
#endif
// other code, class definition blah blah
#if UNITY_EDITOR
EditorUtility.InstanceIDToObject();
#endif

etc, etc

3

You can either place these scripts in a folder named Editor or just add on the very top of the script #if UNITY_EDITOR and at the very bottom #end if

4

So like my previous comment guessed at actually using #if UNITY_EDITOR (basically telling unity to ignore the script UNLESS it is using the unity editor) breaks my game and throws more compile errors, I want to use this function during stand alone gameplay. I have tried using compiler directives to include the script and it’s dependencies like

#if UNITY_STANDALONE
#if UNITY_64
#if UNITY_4_5_1

all to no avail, any answers?