C# Upload

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Web;
using Bo_myCommon;

public class Upload
{
    #region 上传图片

    /// <summary>
    /// 上传图片
    /// </summary>
    /// <param name="imgBuffer">字节数组</param>
    /// <param name="uploadpath">保存路径。绝对或虚拟路径</param>
    /// <param name="imgformat">图片保存格式</param>
    /// <returns>上传成功后返回的新的文件名</returns>
    public static string UploadImage(byte[] imgBuffer, string uploadpath, ImageFormat imgformat)
    {
        try
        {
            System.IO.MemoryStream m = new MemoryStream(imgBuffer);

            if (!Directory.Exists(HttpContext.Current.Server.MapPath(uploadpath)))
                Directory.CreateDirectory(HttpContext.Current.Server.MapPath(uploadpath));

            string imgname = StringHelper.CreateIDCode() + "." + imgformat.ToString().ToLower();

            string _path = HttpContext.Current.Server.MapPath(uploadpath) + imgname;

            Image img = System.Drawing.Image.FromStream(m);
            img.Save(_path, imgformat);
            m.Close();

            return uploadpath + imgname;
        }
        catch (Exception ex)
        {
            return ex.Message;
        }
    }

    /// <summary>
    /// 上传图片
    /// </summary>
    /// <param name="stream">Stream</param>
    /// <param name="uploadpath">保存路径。绝对或虚拟路径</param>
    /// <param name="imgformat">图片保存格式</param>
    /// <returns>上传成功后返回的新的文件名</returns>
    public static string UploadImage(Stream stream, string uploadpath, ImageFormat imgformat)
    {
        try
        {
            Image img = Image.FromStream(stream);
            string filename = StringHelper.CreateIDCode() + "." + imgformat.ToString().ToLower();
            filename = HttpContext.Current.Server.MapPath(uploadpath) + filename;
            img.Save(filename, imgformat);
            return filename;
        }
        catch (Exception ex)
        {
            return ex.Message;
        }
    }

    /// <summary>
    /// 上传图片
    /// </summary>
    /// <param name="postfile">客户端上传的文件</param>
    /// <param name="uploadpath">保存地址</param>
    /// <param name="imgformat">图片格式</param>
    /// <returns></returns>
    public static string UploadImage(HttpPostedFile postfile, string uploadpath, ImageFormat imgformat)
    {
        switch (imgformat.ToString().ToLower())
        {
            case "jpeg":
                return UploadImageForJPEG(postfile, uploadpath);
            case "bmp":
                return UploadImageForBMP(postfile, uploadpath);
            case "png":
                return UploadImageForPNG(postfile, uploadpath);
            case "gif":
                return UploadImageForGIF(postfile, uploadpath);
            default:
                return UploadImageForJPEG(postfile, uploadpath);
        }
    }

    /// <summary>
    /// 上传图片，保存为JPEG格式
    /// </summary>
    /// <param name="postfile">HttpPostedFile</param>
    /// <param name="uploadpath">保存文件地址</param>
    /// <returns>返回上传后的路径</returns>
    public static string UploadImage(HttpPostedFile postfile, string uploadpath, bool autoImageName)
    {
        if (autoImageName)
        {
            switch (Path.GetExtension(postfile.FileName).ToLower())
            {
                case ".jpg":
                    return UploadImageForJPEG(postfile, uploadpath);
                case ".gif":
                    return UploadImageForGIF(postfile, uploadpath);
                case ".png":
                    return UploadImageForPNG(postfile, uploadpath);
                default:
                    return UploadImageForJPEG(postfile, uploadpath);
            }
        }
        else
        {
            Image img = Image.FromStream(postfile.InputStream);
            ImageHelper.ZoomAuto(postfile, uploadpath, img.Width, img.Height, "", "", null);
            return uploadpath;
        }
    }

    /// <summary>
    /// 自动生成新的图片名称
    /// </summary>
    /// <param name="postfile"></param>
    /// <param name="uploadpath"></param>
    /// <returns></returns>
    public static string UploadImage(HttpPostedFile postfile, string uploadpath)
    {
        return UploadImage(postfile, uploadpath, true);
    }

    #region 水印

    #region 上传图片，不缩放，并添加文字水印

    /// <summary>
    /// 上传图片，不缩放，并添加文字水印
    /// </summary>
    /// <param name="postedfile">HTTPPOSTEDFILE</param>
    /// <param name="uploadpath">保存的全路径，包括文件名</param>
    /// <param name="text">水印文字</param>
    /// <param name="waterTextFont">文字水印字体</param>
    public static void UploadImageWithWaterText(HttpPostedFile postedfile, string uploadpath, string text, Font waterTextFont)
    {
        Image img = Image.FromStream(postedfile.InputStream);
        ImageHelper.ZoomAuto(postedfile, uploadpath, img.Width, img.Height, text, "", waterTextFont);
    }

    /// <summary>
    /// 上传图片，不缩放，并添加文字水印
    /// </summary>
    /// <param name="postedfile">HTTPPOSTEDFILE</param>
    /// <param name="uploadpath">保存的全路径，包括文件名</param>
    /// <param name="text">水印文字</param>
    public static void UploadImageWithWaterText(HttpPostedFile postedfile, string uploadpath, string text)
    {
        Image img = Image.FromStream(postedfile.InputStream);
        ImageHelper.ZoomAuto(postedfile, uploadpath, img.Width, img.Height, text, "", null);
    }

    #endregion 上传图片，不缩放，并添加文字水印

    #region 上传图片，不缩放，并添加图片水印

    /// <summary>
    /// 上传图片，不缩放，并添加图片水印
    /// </summary>
    /// <param name="postedfile">源图</param>
    /// <param name="uploadpath">保存的路径，包含上传后的文件名</param>
    /// <param name="waterimg">水印图片的虚拟路径</param>
    public static void UploadImageWithWaterImage(HttpPostedFile postedfile, string uploadpath, string waterimg)
    {
        Image img = Image.FromStream(postedfile.InputStream);
        waterimg = HttpContext.Current.Server.MapPath(waterimg);
        ImageHelper.ZoomAuto(postedfile, uploadpath, img.Width, img.Height, "", waterimg, null);
    }

    #endregion 上传图片，不缩放，并添加图片水印

    /// <summary>
    /// 图片等比缩放
    /// </summary>
    /// <param name="postfile">源图</param>
    /// <param name="uploadpath">保存路径及文件名</param>
    /// <param name="width">宽度</param>
    /// <param name="height">高度</param>
    public static void CutImageAutoZoom(HttpPostedFile postfile, string uploadpath, int width, int height)
    {
        ImageHelper.ZoomAuto(postfile, uploadpath, width, height, "", "", null);
    }

    #endregion 水印

    private static byte[] GetPostFileByte(HttpPostedFile postfile)
    {
        int filelength = postfile.ContentLength;
        byte[] buffer = new byte[filelength];
        postfile.InputStream.Read(buffer, , filelength);
        return buffer;
    }

    private static string UploadImageForBMP(HttpPostedFile postfile, string uploadpath)
    {
        byte[] buffer = GetPostFileByte(postfile);
        return UploadImage(buffer, uploadpath, ImageFormat.Bmp);
    }

    private static string UploadImageForGIF(HttpPostedFile postfile, string uploadpath)
    {
        byte[] buffer = GetPostFileByte(postfile);
        return UploadImage(buffer, uploadpath, ImageFormat.Gif);
    }

    private static string UploadImageForJPEG(HttpPostedFile postfile, string uploadpath)
    {
        byte[] buffer = GetPostFileByte(postfile);
        return UploadImage(buffer, uploadpath, ImageFormat.Jpeg);
    }

    private static string UploadImageForPNG(HttpPostedFile postfile, string uploadpath)
    {
        byte[] buffer = GetPostFileByte(postfile);
        return UploadImage(buffer, uploadpath, ImageFormat.Png);
    }

    #endregion 上传图片

    #region 上传任何文件

    /// <summary>
    /// 上传文件
    /// </summary>
    /// <param name="postfile">上传的原始文件</param>
    /// <param name="uploadpath">保存地址,如：'/upload/images/aaaa.jpg'</param>
    /// <returns>返回上传后的文件名</returns>
    public static string UploadFile(HttpPostedFile postfile, string uploadpath)
    {
        try
        {
            string savepath = HttpContext.Current.Server.MapPath(uploadpath);
            if (!Directory.Exists(uploadpath))
                Directory.CreateDirectory(uploadpath);

            string ext = Path.GetExtension(postfile.FileName);
            string filename = StringHelper.CreateIDCode() + ext;
            if (uploadpath.IndexOf(ext) == -) //判断
            {
                savepath = savepath + filename;
            }
            postfile.SaveAs(savepath);
            return uploadpath + filename;
        }
        catch (Exception ex)
        {
            return ex.Message;
        }
    }

    #endregion 上传任何文件
}