效果如下:
public void plAddSY(object sender, EventArgs e)
{
//C#遍歷指定文件夾中的所有文件
DirectoryInfo TheFolder = new DirectoryInfo(Request.PhysicalApplicationPath + "images\\Product");
//DirectoryInfo TheFolder = new DirectoryInfo("D:\\WebFiles\\Newb2c\\images\\Product");
//遍歷文件夾
foreach (DirectoryInfo NextFolderfirst in TheFolder.GetDirectories())
{
foreach (DirectoryInfo NextFolder in NextFolderfirst.GetDirectories())
{
if (NextFolder.Name == "-2" || NextFolder.Name == "-1" || NextFolder.Name == "0" || NextFolder.Name == "1" || NextFolder.Name == "2" || NextFolder.Name == "3" || NextFolder.Name == "IsBoolImg")
{
//遍歷文件
foreach (FileInfo NextFile in NextFolder.GetFiles())
{
if (NextFile.Name.Contains("SY800SY"))
{
File.Delete(NextFile.FullName);
}
else if (!NextFile.Name.Contains("SY.") && !NextFile.Name.Contains("SY800."))
{
if (!NextFile.Name.Contains("47-47_")&&!NextFile.Name.Contains("50-50_")&&!NextFile.Name.Contains("80-80_")&&!NextFile.Name.Contains("100-100_")&&!NextFile.Name.Contains("120-120_")&&!NextFile.Name.Contains("140-140_")&&!NextFile.Name.Contains("160-160_")&&!NextFile.Name.Contains("380-380_"))
{
MarkWater(NextFile.FullName, Request.PhysicalApplicationPath + "images\\" + "logo-back.png");
//MarkWater(NextFile.FullName, "D:\\WebFiles\\Newb2c\\images\\" + "logo-back.png");
}
}
}
}
}
}
}
/// <summary>
/// 給圖片上水印
/// </summary>
/// <param name="filePath">原圖片地址</param>
/// <param name="waterFile">水印圖片地址</param>
public void MarkWater(string filePath, string waterFile)
{
int i = filePath.LastIndexOf(".");
string ex = filePath.Substring(i, filePath.Length - i);
if (string.Compare(ex, ".gif", true) == 0)
{
return;
}
int newp = filePath.LastIndexOf(".");
string newpo = filePath.Substring(0, newp);
string newpolast = filePath.Substring(newp + 1);
string newlastimg = newpo + "SY800" + "." + newpolast;
BitmapHelper.MakeThumbnail(filePath, newlastimg, 800, 800, "DB", "JPG");
string ModifyImagePath = newlastimg;
int lucencyPercent = 25;
System.Drawing.Image modifyImage = null;
System.Drawing.Image drawedImage = null;
Graphics g = null;
try
{
modifyImage = System.Drawing.Image.FromFile(ModifyImagePath, true);
drawedImage = System.Drawing.Image.FromFile(waterFile, true);
g = Graphics.FromImage(modifyImage);
int x = (modifyImage.Width - drawedImage.Width)/2;
int y = (modifyImage.Height - drawedImage.Height)/2;
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)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), 10, 10, drawedImage.Width, drawedImage.Height, GraphicsUnit.Pixel, imgAttr);
string[] allowImageType = { ".jpg", ".gif", ".png", ".bmp", ".tiff", ".wmf", ".ico" };
FileInfo fi = new FileInfo(ModifyImagePath);
ImageFormat imageType = ImageFormat.Gif;
switch (fi.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;
fs = new FileStream(ModifyImagePath.Replace("SY800.", "SY."), FileMode.Create, FileAccess.Write);
if (fs != null)
{
fs.Write(imgData, 0, imgData.Length);
fs.Close();
}
}
finally
{
try
{
drawedImage.Dispose();
modifyImage.Dispose();
g.Dispose();
}
catch
{
}
}
}
public class BitmapHelper
{
/// <summary>
/// 生成縮略圖
/// </summary>
/// <param name="originalImagePath">源圖路徑（物理路徑）</param>
/// <param name="thumbnailPath">縮略圖路徑（物理路徑）</param>
/// <param name="width">縮略圖寬度</param>
/// <param name="height">縮略圖高度</param>
/// <param name="mode">生成縮略圖的方式</param>
/// <param name="type">縮略圖的圖片類型</param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode, string type)
{
Image originalImage = Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case "HW"://指定高寬縮放（可能變形）
break;
case "W"://指定寬，高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case "H"://指定高，寬按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case "Cut"://指定高寬裁減（不變形）
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
case "DB"://等比縮放（不變形，如果高大按高，寬大按寬縮放）
if ((double)originalImage.Width / (double)towidth < (double)originalImage.Height / (double)toheight)
{
toheight = height;
towidth = originalImage.Width * height / originalImage.Height;
}
else
{
towidth = width;
toheight = originalImage.Height * width / originalImage.Width;
}
break;
default:
break;
}
//新建一個bmp圖片
Image bitmap = new Bitmap(towidth, toheight);
//新建一個畫板
Graphics g = Graphics.FromImage(bitmap);
//設置高質量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//設置高質量,低速度呈現平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空畫布並以透明背景色填充
g.Clear(Color.Transparent);
//在指定位置並且按指定大小繪制原圖片的指定部分
g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
try
{
//保存縮略圖
if (type.ToUpper() == "JPG")
{
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
if (type.ToUpper() == "BMP")
{
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Bmp);
}
if (type.ToUpper() == "GIF")
{
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Gif);
}
if (type.ToUpper() == "PNG")
{
bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Png);
}
}
catch (System.Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}}
