1、首先需要先了解兩個知識點: Unity內建的檔案路徑獲取方式、windows的Directory.GetFiles檔案獲取方式:

　  1>Unity內建的檔案路徑獲取方式,一下是官方解釋:https://docs.unity3d.com/ScriptReference/AssetDatabase.FindAssets.html

　　以下是自己對AssetDatabase類中一些方法的簡單測試:

 1 using System.Collections;
 2 using System.Collections.Generic;
 3 using UnityEngine;
 
 4 using UnityEditor;
 5 
 6 using UnityEngine;
 7 using UnityEditor;
 8 
 9 public class TestAssetDatabase : Editor
10 {
11     const string TestMatPath = @"Assets/Materials/";
12     const string TestMatName = "TestMaterial.mat";
13 
14     static string MatPath = string.Format("{0}{1}", TestMatPath, TestMatName);
 
15 
16     [MenuItem("Tools/Create Asset")]
17     static void CreateMaterial()
18     {
19         var material = new Material(Shader.Find("Specular"));
20         AssetDatabase.CreateAsset(material, MatPath);  //Materials資料夾 需要手動建立
21     }
22 
23     [MenuItem("Tools/Delete Asset")]
24     static void
 
 DeleteMaterial()
25     {
26         AssetDatabase.DeleteAsset(MatPath);
27     }
28 
29     [MenuItem("Tools/Copy Asset")]
30     static void CopyMaterial()
31     {
32         AssetDatabase.CopyAsset(MatPath, "Assets/NewMaterials/TestMaterial.mat");  //NewMaterials資料夾 需要手動建立
33     }
34 
35     [MenuItem("Tools/Load Asset")]
36     static void LoadMaterial()
37     {
38         //載入資源兩種不同的寫法，需要些資源字尾的
39         //Material mat = AssetDatabase.LoadAssetAtPath<Material>(MatPath);
40         Material mat = AssetDatabase.LoadAssetAtPath(MatPath, typeof(Material)) as Material;
41         Debug.Log(mat.color);
42     }
43 
44 
45     //Filter可以是:Name、Lable、Type(內建的、自定義)
46 
47     //Type 關鍵字 t:
48     static string fliterMat = "t:Material";             //單個
49     static string filterPrefab = "t:Prefab";
50     static string fliterMatPre = "t:Material t:Prefab";    //多個
51     static string filterCustomDefine = "t:CustomDefine";   //自定義的型別，需要是ScriptableObject建立的資源
52 
53     //Label 關鍵字 l:
54     static string filterLabel = "l:lgs";
55 
56     static string filterMixed = "Cube l:lgs";   //混合過濾---名字中有Cube，Label為 lgs
57 
58     [MenuItem("Tools/Find Asset")]
59     static void FindAsset()
60     {
61         string[] guidArray = AssetDatabase.FindAssets(filterMixed); 
62         foreach (string item in guidArray)
63         {
64             Debug.Log(AssetDatabase.GUIDToAssetPath(item)); //轉換來的資源路徑是帶有後綴名字的
65         }
66     }
67 }

　　 2>windows的Directory.GetFiles檔案獲取方式,官方解釋:https://docs.microsoft.com/zh-cn/dotnet/api/system.io.directory.getfiles?view=netframework-4.7.2#System_IO_Directory_GetFiles_System_String_System_String_System_IO_SearchOption_

　　以下是官方程式碼示例(指定以字母開頭的檔案數):

 1 using System;
 2 using System.IO;
 3 
 4 class Test 
 5 {
 6     public static void Main() 
 7     {
 8         try 
 9         {
10             // Only get files that begin with the letter "c."
11             string[] dirs = Directory.GetFiles(@"c:\", "c*");
12             Console.WriteLine("The number of files starting with c is {0}.", dirs.Length);
13             foreach (string dir in dirs) 
14             {
15                 Console.WriteLine(dir);
16             }
17         } 
18         catch (Exception e) 
19         {
20             Console.WriteLine("The process failed: {0}", e.ToString());
21         }
22     }
23 }

在獲取不同資源的時候，只需要對不同型別的資源加以不同的過濾標籤，
例如：
過濾器，若以t:開頭，表示用unity的方式過濾；若以f:開頭，表示用windows的SearchPattern方式過濾；若以r:開頭，表示用正則表示式的方式過濾
再根據過濾標籤，獲取不同的資源路徑即可