新手求助：如何复制一张已知的图片（在服务器上了）另存为其他名称！

Question

我正在弄一个上传并生成水印的方法，找到一个比较简洁可用的，但有一个问题，就是源图片和最后生成带有水印的图片不能是同一张，所以想考虑先复制原图，再用复制的原图生成水印，最后删掉原图！不知我这个思路正不正确，请高人指点这是我在网上找来生成水印的函数，感觉很不错，如果能改成我上面说的问题，就很完美了！
代码如下：
/// <summary>
    /// 给图片加水印
    /// </summary>
    /// <param name="strPath">原始文件</param>
    /// <param name="strPathSyp">水印文件</param>
    /// <param name="strPathSypf">加水印后的结果文件</param>
    ///        public static void AddWaterPic(string strPath, string strPathSyp, string strPathSypf)
    {
        
        
        System.Drawing.Image image = System.Drawing.Image.FromFile(strPath);
        Bitmap bm = new Bitmap(image);        System.Drawing.Image copyImage = System.Drawing.Image.FromFile(strPathSyp);        System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bm);        //如果要使水印居中显示，只要更改bm.Width - copyImage.Width, bm.Height - copyImage.Height，这两个值        //就可以了，在实际项目中，我用的是Convert.ToInt32(image.Width * 0.3), Convert.ToInt32(image.Height * 0.3)        g.DrawImage(copyImage, new System.Drawing.Rectangle(bm.Width - copyImage.Width, bm.Height - copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, System.Drawing.GraphicsUnit.Pixel);
        g.Dispose();
        copyImage.Dispose();
        bm.Save(strPathSypf);
        bm.Dispose();
    }

Answer 1

可以
private void importPhoto() 
    { 
        string strPhotoPath= Server.MapPath("../UploadFile/"); 
        if (string.IsNullOrEmpty(File1.PostedFile.FileName)) 
        { 
            string strPath = File1.PostedFile.FileName; 
            try 
            { 
                string extension = Path.GetExtension(File1.PostedFile.FileName).ToUpper(); 
                string fileName = DateTime.Now.ToString("yyyyMMddhhmmss"); 
                strPath = strPath.Substring(strPath.LastIndexOf("\\") + 1); 
                File1.PostedFile.SaveAs(strPhotoPath + strPath); 
                PicMark wm = new PicMark(); 
                wm.PMark(new PicMark(), Server.MapPath("../ffy_images/") + ".png", strPhotoPath + strPath, strPhotoPath + fileName + extension); 
              strPath = fileName + extension; 
            } 
            catch () 
            { 
                
            } 
        }     } 
public class pic 
{ 
    private string modifyImagePath = null; 
    private string drawedImagePath = null; 
    private int rightSpace; 
    private int bottoamSpace; 
    private int lucencyPercent = 70; 
    private string outPath = null; 
    public pic() 
    { 
          } 
    public string ModifyImagePath 
    { 
        get { return this.modifyImagePath; } 
        set { this.modifyImagePath = value; } 
    } 
    public string DrawedImagePath 
    { 
        get { return this.drawedImagePath; } 
        set { this.drawedImagePath = value; } 
    } 
  
    public int RightSpace 
    { 
        get { return this.rightSpace; } 
        set { this.rightSpace = value; } 
    } 
    public int BottoamSpace 
    { 
        get { return this.bottoamSpace; } 
        set { this.bottoamSpace = value; } 
    } 
    public int LucencyPercent 
    { 
        get { return this.lucencyPercent; } 
        set 
        { 
            if (value >= 0 && value <= 100) 
                this.lucencyPercent = value; 
        } 
    } 
  
    public string OutPath 
    { 
        get { return this.outPath; } 
        set { this.outPath = value; } 
    } 
    
    public void DrawImage() 
    { 
        Image modifyImage = null; 
        Image drawedImage = null; 
        Graphics g = null; 
        try 
        { 
            modifyImage = Image.FromFile(this.ModifyImagePath); 
            drawedImage = Image.FromFile(this.DrawedImagePath); 
            g = Graphics.FromImage(modifyImage); 
            int x = modifyImage.Width - this.rightSpace; 
            int y = modifyImage.Height - this.BottoamSpace; 
            float[][] matrixItems ={ 
  new float[] {1, 0, 0, 0, 0}, 
  new float[] {0, 1, 0, 0, 0}, 
  new float[] {0, 0, 1, 0, 0}, 
  new float[] {0, 0, 0, (float)this.LucencyPercent/100f, 0}, 
  new float[] {0, 0, 0, 0, 1}}; 
            ColorMatrix colorMatrix = new ColorMatrix(matrixItems); 
            ImageAttributes imgAttr = new ImageAttributes(); 
            imgAttr.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); 
            g.DrawImage( 
                drawedImage, 
                new Rectangle(x, y, drawedImage.Width, drawedImage.Height), 
                0, 0, drawedImage.Width, drawedImage.Height, 
                GraphicsUnit.Pixel, imgAttr); 
            string[] allowImageType ={ ".jpg", ".gif", ".png", ".bmp", ".tiff", ".wmf", ".ico" }; 
            FileInfo file = new FileInfo(this.ModifyImagePath); 
            ImageFormat imageType = ImageFormat.Gif; 
            switch (file.Extension.ToLower()) 
            { 
                case ".jpg": 
                    imageType = ImageFormat.Jpeg; 
                    break; 
                case ".gif": 
                    imageType = ImageFormat.Gif; 
                    break; 
                case ".png": 
                    imageType = ImageFormat.Png; 
                    break; 
                case ".bmp": 
                    imageType = ImageFormat.Bmp; 
                    break; 
                case ".tif": 
                    imageType = ImageFormat.Tiff; 
                    break; 
                case ".wmf": 
                    imageType = ImageFormat.Wmf; 
                    break; 
                case ".ico": 
                    imageType = ImageFormat.Icon; 
                    break; 
                default: 
                    break; 
            } 
            MemoryStream ms = new MemoryStream(); 
            modifyImage.Save(ms, imageType); 
            byte[] imgData = ms.ToArray(); 
            modifyImage.Dispose(); 
            drawedImage.Dispose(); 
            g.Dispose(); 
            FileStream fs = null; 
            if (this.OutPath == null || this.OutPath == "") 
            { 
                File.Delete(this.ModifyImagePath); 
                fs = new FileStream(this.ModifyImagePath, FileMode.Create, FileAccess.Write); 
            } 
            else 
            { 
                fs = new FileStream(this.OutPath, FileMode.Create, FileAccess.Write); 
            } 
            if (fs != null) 
            { 
                fs.Write(imgData, 0, imgData.Length); 
                fs.Close(); 
            } 
        } 
        finally 
        { 
            try 
            { 
                drawedImage.Dispose(); 
                modifyImage.Dispose(); 
                g.Dispose(); 
            } 
            catch { ;} 
        } 
    } 
}