【.NET】上传文件，生成缩略图

类名：Upload

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.Web.Util;

namespace Tools

{

    /// <summary>

    /// UploadPic 的摘要说明。

    /// </summary>

    public class UploadPic

    {

        #region 构造函数

        public UploadPic()

        {

            //

            // TODO: 在此处添加构造函数逻辑

            //

        }

        #endregion

        #region 上传图片，并生成缩略图

        public string upload(System.Web.UI.HtmlControls.HtmlInputFile UploadFile, int tWidth, int tHeight)

        {

            string result = "";

            //检查上传文件的格式是否有效

            if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )

            {

                result = "上传图片格式无效!";

                return result;

            }

            //生成原图

            Byte[] oFileByte = new byte[UploadFile.PostedFile.ContentLength];

            System.IO.Stream oStream = UploadFile.PostedFile.InputStream;

            System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);

            int oWidth = oImage.Width; //原图宽度

            int oHeight = oImage.Height; //原图高度

            if(oWidth < tWidth && oHeight < tHeight)

            {

                result = "smaller";

                return result;

            }

            //按比例计算出缩略图的宽度和高度

            if(oWidth >= oHeight)

            {

                tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));

            }

            else

            {

                tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));

            }

            //生成缩略原图

            Bitmap tImage = new Bitmap(tWidth, tHeight);

            Graphics g = Graphics.FromImage(tImage);

            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法

            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度

            g.Clear(Color.Transparent); //清空画布并以透明背景色填充

            g.DrawImage(oImage, new Rectangle(, , tWidth, tHeight), new Rectangle(, , oWidth, oHeight), GraphicsUnit.Pixel);

            string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg";

            string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径

            string tFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file; //保存缩略图的物理路径

            result = file;

            try

            {

                //以JPG格式保存图片

                oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);

                tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg);

            }

            catch(Exception ex)

            {

                throw ex;

            }

            finally

            {

                //释放资源

                oImage.Dispose();

                g.Dispose();

                tImage.Dispose();

            }

            return result;

        }

        public string uploadPNGSIZE(System.Web.UI.HtmlControls.HtmlInputFile UploadFile, int tWidth, int tHeight)

        {

            string result = "";

            //检查上传文件的格式是否有效

            if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )

            {

                result = "上传图片格式无效!";

                return result;

            }

            //生成原图

            Byte[] oFileByte = new byte[UploadFile.PostedFile.ContentLength];

            System.IO.Stream oStream = UploadFile.PostedFile.InputStream;

            System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);

            int oWidth = oImage.Width; //原图宽度

            int oHeight = oImage.Height; //原图高度

            if(oWidth < tWidth && oHeight < tHeight)

            {

                result = "smaller";

                return result;

            }

            //按比例计算出缩略图的宽度和高度

            if(oWidth >= oHeight)

            {

                tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));

            }

            else

            {

                tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));

            }

            //生成缩略原图

            Bitmap tImage = new Bitmap(tWidth, tHeight);

            Graphics g = Graphics.FromImage(tImage);

            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法

            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度

            g.Clear(Color.Transparent); //清空画布并以透明背景色填充

            g.DrawImage(oImage, new Rectangle(, , tWidth, tHeight), new Rectangle(, , oWidth, oHeight), GraphicsUnit.Pixel);

            string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg";

            string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../images/") + file;//保存原图的物理路径

            string tFullName = System.Web.HttpContext.Current.Server.MapPath("../../images/") + file; //保存缩略图的物理路径

            result = file;

            try

            {

                //以JPG格式保存图片

                oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);

                tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Png);

            }

            catch(Exception ex)

            {

                throw ex;

            }

            finally

            {

                //释放资源

                oImage.Dispose();

                g.Dispose();

                tImage.Dispose();

            }

            return result;

        }

        #endregion

        public string upload_watermark(System.Web.UI.HtmlControls.HtmlInputFile UploadFile, int tWidth, int tHeight)

        {

            string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);

            string result = "";

            //检查上传文件的格式是否有效

            if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )

            {

                result = "上传图片格式无效!";

                return result;

            }

            //生成原图

            Byte[] oFileByte = new byte[UploadFile.PostedFile.ContentLength];

            System.IO.Stream oStream = UploadFile.PostedFile.InputStream;

            System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);

            //加水印

            System.Drawing.Image copyImage = System.Drawing.Image.FromFile(System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + "watermark.png");

            Graphics g_water = Graphics.FromImage(oImage);

            g_water.DrawImage(copyImage, new Rectangle(oImage.Width - copyImage.Width, , copyImage.Width, copyImage.Height), , , copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);

            g_water.Dispose();

            int oWidth = oImage.Width; //原图宽度

            int oHeight = oImage.Height; //原图高度

            if(oWidth < tWidth && oHeight < tHeight)

            {

                result = "smaller";

                return result;

            }

            //按比例计算出缩略图的宽度和高度

            if(oWidth >= oHeight)

            {

                tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));

            }

            else

            {

                tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));

            }

            //生成缩略原图

            Bitmap tImage = new Bitmap(tWidth, tHeight);

            Graphics g = Graphics.FromImage(tImage);

            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法

            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度

            g.Clear(Color.Transparent); //清空画布并以透明背景色填充

            g.DrawImage(oImage, new Rectangle(, , tWidth, tHeight), new Rectangle(, , oWidth, oHeight), GraphicsUnit.Pixel);

            string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;

            string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径

            string tFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file; //保存缩略图的物理路径

            result = file;

            try

            {

                //以不同格式保存图片

                if(filetype.Trim().ToLower().CompareTo(".png") == )

                {

                    oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);

                    tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Png);

                }

                else

                {

                    oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);

                    tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg);

                }

            }

            catch(Exception ex)

            {

                throw ex;

            }

            finally

            {

                //释放资源

                oImage.Dispose();

                g.Dispose();

                tImage.Dispose();

            }

            return result;

        }

        public string upload_watermark_origin(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)

        {

            int tWidth = , tHeight = ;

            string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);

            string result = "";

            //检查上传文件的格式是否有效

            if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )

            {

                result = "上传图片格式无效!";

                return result;

            }

            //生成原图

            Byte[] oFileByte = new byte[UploadFile.PostedFile.ContentLength];

            System.IO.Stream oStream = UploadFile.PostedFile.InputStream;

            System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);

            //加水印

            System.Drawing.Image copyImage = System.Drawing.Image.FromFile(System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + "watermark.png");

            Graphics g_water = Graphics.FromImage(oImage);

            g_water.DrawImage(copyImage, new Rectangle(oImage.Width - copyImage.Width, , copyImage.Width, copyImage.Height), , , copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);

            g_water.Dispose();

            int oWidth = oImage.Width; //原图宽度

            tWidth = oWidth;

            int oHeight = oImage.Height; //原图高度

            tHeight = oHeight;

            if(oWidth < tWidth && oHeight < tHeight)

            {

                result = "smaller";

                return result;

            }

            //按比例计算出缩略图的宽度和高度

            if(oWidth >= oHeight)

            {

                tHeight = (int)Math.Floor(Convert.ToDouble(oHeight) * (Convert.ToDouble(tWidth) / Convert.ToDouble(oWidth)));

            }

            else

            {

                tWidth = (int)Math.Floor(Convert.ToDouble(oWidth) * (Convert.ToDouble(tHeight) / Convert.ToDouble(oHeight)));

            }

            //生成缩略原图

            Bitmap tImage = new Bitmap(tWidth, tHeight);

            Graphics g = Graphics.FromImage(tImage);

            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法

            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度

            g.Clear(Color.Transparent); //清空画布并以透明背景色填充

            g.DrawImage(oImage, new Rectangle(, , tWidth, tHeight), new Rectangle(, , oWidth, oHeight), GraphicsUnit.Pixel);

            string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;

            string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径

            string tFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file; //保存缩略图的物理路径

            result = file;

            try

            {

                //以不同格式保存图片

                if(filetype.Trim().ToLower().CompareTo(".png") == )

                {

                    oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);

                    tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Png);

                }

                else

                {

                    oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);

                    tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg);

                }

            }

            catch(Exception ex)

            {

                throw ex;

            }

            finally

            {

                //释放资源

                oImage.Dispose();

                g.Dispose();

                tImage.Dispose();

            }

            return result;

        }

        #region 上传图片

        public string uploadDirect(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)

        {

            string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);

            string result = "";

            //检查上传文件的格式是否有效

            if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") >= )

            {

                if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )

                {

                    result = "上传图片格式无效!";

                    return result;

                }

                //生成原图

                System.IO.Stream oStream = UploadFile.PostedFile.InputStream;

                System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);

                string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;

                string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径

                result = file;

                try

                {

                    //以不同格式保存图片

                    if(filetype.Trim().ToLower().CompareTo(".png") == )

                    {

                        oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);

                    }

                    else

                    {

                        oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);

                    }

                }

                catch(Exception ex)

                {

                    //抛出异常

                    throw ex;

                }

                finally

                {

                    //释放资源

                    oImage.Dispose();

                }

            }

            else

            {

                string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;

                string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存原图的物理路径

                result = file;

                UploadFile.PostedFile.SaveAs(oFullName);

            }

            return result;

        }

        public string uploadArticle(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)

        {

            string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);

            string result = "";

            //检查上传文件的格式是否有效

            if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") >= )

            {

                if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )

                {

                    result = "上传图片格式无效!";

                    return result;

                }

                //生成原图

                System.IO.Stream oStream = UploadFile.PostedFile.InputStream;

                System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);

                string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;

                string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径

                result = file;

                try

                {

                    //以不同格式保存图片

                    if(filetype.Trim().ToLower().CompareTo(".png") == )

                    {

                        oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);

                    }

                    else

                    {

                        oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);

                    }

                }

                catch(Exception ex)

                {

                    throw ex;

                }

                finally

                {

                    //释放资源

                    oImage.Dispose();

                }

            }

            else

            {

                string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;

                string oFullName = System.Web.HttpContext.Current.Server.MapPath("File/") + file;//保存原图的物理路径

                result = file;

                UploadFile.PostedFile.SaveAs(oFullName);

            }

            return result;

        }

        public string uploadDirectWeb(System.Web.UI.WebControls.FileUpload UploadFile)

        {

            string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);

            string result = "";

            //检查上传文件的格式是否有效

            if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("pdf") < )

            {

                if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )

                {

                    result = "上传图片格式无效!";

                    return result;

                }

                //生成原图

                System.IO.Stream oStream = UploadFile.PostedFile.InputStream;

                System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);

                string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;

                string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径

                result = file;

                try

                {

                    //以不同格式保存图片

                    if(filetype.Trim().ToLower().CompareTo(".png") == )

                    {

                        oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);

                    }

                    else

                    {

                        oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg);

                    }

                }

                catch(Exception ex)

                {

                    throw ex;

                }

                finally

                {

                    //释放资源

                    oImage.Dispose();

                }

            }

            else

            {

                string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".pdf";

                string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存原图的物理路径

                result = file;

                UploadFile.PostedFile.SaveAs(oFullName);

            }

            return result;

        }

        public string uploadPNG(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)

        {

            string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);

            string result = "";

            //检查上传文件的格式是否有效

            if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("pdf") < )

            {

                if(UploadFile.PostedFile.ContentType.ToLower().IndexOf("image") < )

                {

                    result = "上传图片格式无效!";

                    return result;

                }

                //生成原图

                System.IO.Stream oStream = UploadFile.PostedFile.InputStream;

                System.Drawing.Image oImage = System.Drawing.Image.FromStream(oStream);

                string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;

                string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../UploadImg/") + file;//保存原图的物理路径

                result = file;

                try

                {

                    //以JPG格式保存图片

                    oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Png);

                }

                catch(Exception ex)

                {

                    throw ex;

                }

                finally

                {

                    //释放资源

                    oImage.Dispose();

                }

            }

            else

            {

                string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".pdf";

                string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存原图的物理路径

                result = file;

                UploadFile.PostedFile.SaveAs(oFullName);

            }

            return result;

        }

        public string uploadFlv(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)

        {

            string result = "";

            //检查上传文件的格式是否有效

            string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".flv";

            string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存文件的物理路径

            result = file;

            UploadFile.PostedFile.SaveAs(oFullName);

            return result;

        }

        public string uploadFile(System.Web.UI.HtmlControls.HtmlInputFile UploadFile)

        {

            string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);

            string result = "";

            string file = DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;

            string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存文件的物理路径

            result = file;

            UploadFile.PostedFile.SaveAs(oFullName);

            return result;

        }

        public string uploadProjectFile(System.Web.UI.HtmlControls.HtmlInputFile UploadFile, string filename)

        {

            string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);

            string result = "";

            string file = filename + "_" + DateTime.Now.ToShortDateString().Replace("-", "").Replace("/", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + filetype;

            string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../file/") + file;//保存文件的物理路径

            result = file;

            UploadFile.PostedFile.SaveAs(oFullName);

            return result;

        }

        public string uploadAdvertisement(System.Web.UI.HtmlControls.HtmlInputFile UploadFile, string filename)

        {

            string filetype = System.IO.Path.GetExtension(UploadFile.PostedFile.FileName);

            string result = "";

            if(filetype.Trim().CompareTo(".flv") != )

            {

                result = "wrongformat";

            }

            else

            {

                string file = filename + filetype;

                string oFullName = System.Web.HttpContext.Current.Server.MapPath("../../flash/") + file;//保存文件的物理路径

                result = file;

                UploadFile.PostedFile.SaveAs(oFullName);

            }

            return result;

        }

        #endregion

    }

}

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