c#高效比对大量图片的实例代码

public bool CheckImg(string filePath1, string filePath2)
        {

          
            MemoryStream ms1 = new MemoryStream();
            Image image1 = Image.FromFile(filePath1);
            image1.Save(ms1, System.Drawing.Imaging.ImageFormat.Jpeg);

            string img1 = Convert.ToBase64String(ms1.ToArray());

            Image image2 = Image.FromFile(filePath2);
            image2.Save(ms1, System.Drawing.Imaging.ImageFormat.Jpeg);
            string img2 = Convert.ToBase64String(ms1.ToArray());

            if (img1.Equals(img2))
            {
               return true;
            }
            else
            {
                return false;
            }
        }

public static List<Dictionary<string, string>> chekImgss(string filePath)
        {

            List<Dictionary<string, string>> liststr = new List<Dictionary<string, string>>();
            DirectoryInfo dir = new DirectoryInfo(filePath);
            FileInfo[] files = dir.GetFiles();
            foreach (FileInfo fileInfo in files)
            {
                Dictionary<string, string> dic = new Dictionary<string, string>();
                string ex = fileInfo.Extension;
                if (ex == ".jpg" || ex == ".png")
                {
                    MemoryStream ms1 = new MemoryStream();
                    Image image2 = Image.FromFile(filePath + fileInfo.Name);
                    image2.Save(ms1, System.Drawing.Imaging.ImageFormat.Jpeg);

                    string imgBase64 = Convert.ToBase64String(ms1.ToArray());

                    dic["base64"] = imgBase64;
                    dic["imgName"] = fileInfo.Name;
                    liststr.Add(dic);
                }
            }

            return liststr;
        }

/// <summary>
        /// 对数组进行深拷贝
        /// </summary>
        /// <param name="files"></param>
        /// <returns></returns>
        public static List<Dictionary<string, string>> CopyList(List<Dictionary<string, string>> files)
        {
            MemoryStream ms = new MemoryStream();//序列化
            BinaryFormatter bf = new BinaryFormatter();
            bf.Serialize(ms, files);
            ms.Position = 0;

            List<Dictionary<string, string>> array3 = (List<Dictionary<string, string>>)bf.Deserialize(ms);  //反序列化
            return array3;
        }

        /// <summary>
        /// 比较图片
        /// </summary>
        /// <param name="listDic"></param>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static List<Dictionary<object, string>> chekImg2(List<Dictionary<string, string>> listDic,string filePath)
        {
            List<Dictionary<object, string>> list = new List<Dictionary<object, string>>();

            DirectoryInfo dir = new DirectoryInfo(filePath);
            var files = dir.GetFiles().ToList();

            for (int j = 0; j < listDic.Count; j++)
            {
                var file = listDic[j];

               
                var fileList = CopyList(listDic);
                var index = 0;
                var isFirst = false;
                Dictionary<object, string> dic = new Dictionary<object, string>();
                for (int i = 0; i < fileList.Count; i++)
                {
                    var fileInfo = fileList[i];

                    if (file["imgName"] == fileInfo["imgName"])
                    {
                        fileList.Remove(fileInfo);
                        i -= 1;
                        continue;
                    }
                    //使用equals比普通的，string==string 高效很多倍
                    if (file["base64"].Equals(fileInfo["base64"]))
                    {
                        if (!isFirst)
                        {
                            dic[++index] = file["imgName"];
                            isFirst = true;
                        }
                        dic[++index] = fileInfo["imgName"];

                        fileList.Remove(fileInfo);

                        listDic.Remove(listDic.Where(c => c.Values.Contains(fileInfo["imgName"])).FirstOrDefault());
                        i -= 1;
                    }
                    else
                    {
                        fileList.Remove(fileInfo);
                        i -= 1;
                    }

                }

                if (dic.Keys.Count > 0)
                {
                    list.Add(dic);
                    listDic.Remove(file);
                    j -= 1;
                }
                else
                {
                    listDic.Remove(file);
                    j -= 1;
                }
            }
            return list;
        }