.NET将图片上传到服务器指定的目录下

js中将上传的图片转化成base64并传值到后台

$("#pc_file1").change(function () {
                var file = $("#pc_file1").get(0).files[0];
                var reader = new FileReader();
                reader.readAsDataURL(file);
                reader.onload = function (e) {
                    // 图片格式为 base64
                    var base64 = e.target.result;
                    MachineInspection.base64 = base64;
                }
            });

将参数base64传入后台

        string Dfile = "";
        //服务器地址
        string path = "D:\FUSE\UPLOAD_CJ_IMAGES";
        int count = Directory.GetFiles(path).Count();
        string name= DateTime.Now.ToString("yyyyMMddHHmmss");
        string pathname = DateTime.Now.ToString("yyyyMMdd");
        //log为原本图片文件后缀名
        string filename = name+ log;
        string fileno = "";
        //判斷文件夾是否存在
        if (!Directory.Exists(path + "\" + pathname))
        {
            Directory.CreateDirectory(path + "\" + pathname);
            Dfile = path + "\" + pathname + "\" + filename;
        }
        else
        {
            //一个文件夹下最多放500张图片
            int count1 = Directory.GetFiles(path + "\" + pathname).Count();
            if (count1 >= 500)
            {
                count += 1;
                Directory.CreateDirectory(path + "\" + (count).ToString());
                Dfile = path + "\" + (count).ToString() + "\" + filename;
            }
            else
            Dfile = path + "\" + pathname + "\" + filename;
        }
        try
        {
            //上传文件
            GetPicThumbnail(base64, Dfile);
        }
        catch
        {
            Dfile = "";
            return "err";
        }

public void GetPicThumbnail(string Base64, string dFile)
    {
        byte[] buffer = Convert.FromBase64String(Base64.Substring(Base64.IndexOf(',') + 1));
        int flag = 20;
        MemoryStream stream = new MemoryStream(buffer);
        Image iSource = Image.FromStream(stream);
        ImageFormat tFormat = iSource.RawFormat;
        int sW = 0, sH = 0;
        int dHeight = iSource.Height, dWidth = iSource.Width;

        Size tem_size = new Size(iSource.Width, iSource.Height);

        if (tem_size.Width > dHeight || tem_size.Width > dWidth)
        {
            if ((tem_size.Width * dHeight) > (tem_size.Width * dWidth))
            {
                sW = dWidth;
                sH = (dWidth * tem_size.Height) / tem_size.Width;
            }
            else
            {
                sH = dHeight;
                sW = (tem_size.Width * dHeight) / tem_size.Height;
            }
        }
        else
        {
            sW = tem_size.Width;
            sH = tem_size.Height;
        }

        Bitmap ob = new Bitmap(dWidth, dHeight);
        Graphics g = Graphics.FromImage(ob);

        g.Clear(Color.WhiteSmoke);
        g.CompositingQuality = CompositingQuality.HighQuality;
        g.SmoothingMode = SmoothingMode.HighQuality;
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;

        g.DrawImage(iSource, new Rectangle((dWidth - sW) / 2, (dHeight - sH) / 2, sW, sH), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);

        g.Dispose();

        EncoderParameters ep = new EncoderParameters();
        long[] qy = new long[1];
        qy[0] = flag;
        EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
        ep.Param[0] = eParam;
        try
        {
            ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
            ImageCodecInfo jpegICIinfo = null;
            for (int x = 0; x < arrayICI.Length; x++)
            {
                if (arrayICI[x].FormatDescription.Equals("JPEG"))
                {
                    jpegICIinfo = arrayICI[x];
                    break;
                }
            }
            if (jpegICIinfo != null)
            {
                ob.Save(dFile, jpegICIinfo, ep);//dFile
            }
            else
            {
                ob.Save(dFile, tFormat);
            }
        }
        finally
        {
            iSource.Dispose();
            ob.Dispose();
        }
    }