AssetDatabase.IsDirectoryMonitoringEnabled

Returns

bool Returns true when Directory Monitoring is enabled. Returns false otherwise.

Description

Reports whether Directory Monitoring is enabled.

Turn Directory Monitoring on or off in Preferences settings or in script with EditorPrefs.SetBool("DirectoryMonitoring", boolValue).
Directory Monitoring can be disabled with command line flag [[-DisableDirectoryMonitor]] and Directory Monitoring is automatically disabled when Unity detects symlinks in the project.

using UnityEngine;
using UnityEditor;
using UnityEngine.Profiling;
using System.IO;

public class DirectoryMonitoringTest
{
    [MenuItem("AssetDatabase/Directory Monitoring Test")]
    static void DirectoryMonitoringBenchmark()
    {
        var BenchmarkCount = 1;

        //Disabling the Directory Monitoring will use a brute force scanning method to evaluate which files in the project have been changed, and is much slower
        EditorPrefs.SetBool("DirectoryMonitoring", false);
        Debug.Log("Is Directory Monitoring Enabled? - " + AssetDatabase.IsDirectoryMonitoringEnabled());

        Benchmark(BenchmarkCount);
        BenchmarkCount++;

        EditorPrefs.SetBool("DirectoryMonitoring", true);
        Debug.Log("Is Directory Monitoring Enabled? - " + AssetDatabase.IsDirectoryMonitoringEnabled());
        Benchmark(BenchmarkCount);
    }

    //This test will show faster scan time when using Directory Monitoring
    static void Benchmark(int BenchmarkCount)
    {
        var relativePath = "Assets/test_file01.txt";
        if (!File.Exists(relativePath))
        {
            using (StreamWriter sw = File.CreateText(relativePath))
            {
                sw.WriteLine("Hello");
                sw.WriteLine("And");
                sw.WriteLine("Welcome");
            }
        }

        Profiler.BeginSample("Benchmark " + BenchmarkCount); ;
        AssetDatabase.ImportAsset(relativePath);
        Profiler.EndSample();

        AssetDatabase.DeleteAsset(relativePath);
        AssetDatabase.Refresh();
    }
}