查找使用过图片的预制体

using UnityEngine;
using UnityEditor;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using System.Collections.Generic;

public class FindReferences : EditorWindow
{
    [MenuItem("自定义工具/检查图片资源/替换通用资源")]
    public static void ShowWindow()
    {
        EditorWindow.GetWindow(typeof(FindReferences), false, "替换通用资源");
    }

    private UnityEngine.Object OnCheckFolder;                           //检测模型文件夹目录
    private UnityEngine.Object Pictures;                                //需要查找的图片
    private List