public static string GetThumbsPath(string originalImagePath, string thumbnailPath)
{
string str = thumbnailPath;
string uploadDir = SiteConfig.SiteOption.UploadDir;
int thumbsWidth = SiteConfig.ThumbsConfig.ThumbsWidth;
int thumbsHeight = SiteConfig.ThumbsConfig.ThumbsHeight;
int thumbsMode = SiteConfig.ThumbsConfig.ThumbsMode;
string addBackColor = SiteConfig.ThumbsConfig.AddBackColor;
ThumbsMode byHeightAndWidth = ThumbsMode.ByHeightAndWidth;
if (thumbsWidth <= 0)
{
if (thumbsHeight > 0)
{
byHeightAndWidth = ThumbsMode.ByHeight;
}
}
else if (thumbsHeight <= 0)
{
byHeightAndWidth = ThumbsMode.ByWidth;
}
else
{
switch (thumbsMode)
{
case 0:
byHeightAndWidth = ThumbsMode.ByHeightAndWidth;
goto Label_007A;
case 1:
byHeightAndWidth = ThumbsMode.CutByHeightOrWidth;
goto Label_007A;
case 2:
byHeightAndWidth = ThumbsMode.AddBackColor;
goto Label_007A;
}
}
Label_007A:
if (!uploadDir.EndsWith("/", StringComparison.Ordinal))
{
uploadDir = uploadDir + @"\";
}
string str4 = HttpContext.Current.Server.MapPath("~/");
originalImagePath = str4 + uploadDir + originalImagePath;
thumbnailPath = str4 + uploadDir + thumbnailPath;
MakeThumbnail(originalImagePath, thumbnailPath, thumbsWidth, thumbsHeight, byHeightAndWidth, addBackColor);
return(str);
}
/// <summary>
/// 生成缩略图，并返回图片调用URL。
/// 返回格式：/uploads/123_S_50_50.jpg
/// </summary>
/// <param name="originalImagePath">原图Url(如：/uploads/123.jpg)</param>
/// <param name="isRebuild">存在同名的缩略图时，是否重新生成。（true：是；false：否；）</param>
/// <returns></returns>
public static string GetThumbUrl(string originalImagePath, bool isRebuild)
{
ThumbsConfig thumbConfig = ConfigHelper.Get <ThumbsConfig>();
int thumbsWidth = thumbConfig.ThumbsWidth;
int thumbsHeight = thumbConfig.ThumbsHeight;
int thumbsMode = thumbConfig.ThumbsMode;
string addBackColor = thumbConfig.AddBackColor;
ThumbsMode byHeightAndWidth = ThumbsMode.ByHeightAndWidth;
switch (thumbsMode)
{
case 0:
byHeightAndWidth = ThumbsMode.ByHeightAndWidth;
break;
case 1:
byHeightAndWidth = ThumbsMode.CutByHeightOrWidth;
break;
case 2:
byHeightAndWidth = ThumbsMode.AddBackColor;
break;
}
originalImagePath = originalImagePath.TrimStart('~');
string strOriImagePhysical = FileHelper.MapPath(FileHelper.WebRootPath + FileHelper.DirectorySeparatorChar + originalImagePath.Replace("/", FileHelper.DirectorySeparatorChar));
string strImageDir = Path.GetDirectoryName(strOriImagePhysical) + Path.DirectorySeparatorChar.ToString();
string strImageName = Path.GetFileNameWithoutExtension(strOriImagePhysical);
string strImageExtension = Path.GetExtension(strOriImagePhysical);
string strThumbFileName = strImageName + "_S" + "_" + thumbsWidth.ToString() + "_" + thumbsHeight.ToString() + strImageExtension;
string strResult = originalImagePath.Substring(0, originalImagePath.LastIndexOf("/") + 1) + strThumbFileName;
if (!isRebuild)
{
if (File.Exists(strImageDir + strThumbFileName))
{
return(strResult);
}
}
MakeThumbnail(strOriImagePhysical, strImageDir + strThumbFileName, thumbsWidth, thumbsHeight, byHeightAndWidth, addBackColor);
return(strResult);
}
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, ThumbsMode thumbsMode, string bgColor)
{
Image image = null;
try
{
image = Image.FromFile(originalImagePath);
}
catch (FileNotFoundException)
{
CustomException.ThrowBllException("生成缩略图的源图片未找到");
}
int num = width;
int num2 = height;
int x = 0;
int y = 0;
int num5 = image.Width;
int num6 = image.Height;
switch (thumbsMode)
{
case ThumbsMode.ByWidth:
num2 = (image.Height * width) / image.Width;
break;
case ThumbsMode.ByHeight:
num = (image.Width * height) / image.Height;
break;
case ThumbsMode.CutByHeightOrWidth:
if (num == 0)
{
num = 1;
}
if (num2 == 0)
{
num2 = 1;
}
if ((((double)image.Width) / ((double)image.Height)) > (((double)num) / ((double)num2)))
{
num6 = image.Height;
num5 = (image.Height * num) / num2;
y = 0;
x = (image.Width - num5) / 2;
}
else
{
num5 = image.Width;
num6 = (image.Width * height) / num;
x = 0;
y = (image.Height - num6) / 2;
}
break;
case ThumbsMode.AddBackColor:
{
double num7 = GetThumbsPercent(image.Width, image.Height, width, height);
if (width == 0)
{
width = 1;
}
if (height == 0)
{
height = 1;
}
num = Convert.ToInt32((double)(((double)image.Width) / num7));
num2 = Convert.ToInt32((double)(((double)image.Height) / num7));
x = (width - num) / 2;
y = (height - num2) / 2;
num5 = x + num;
num6 = y + num2;
break;
}
}
if (num == 0)
{
num = 1;
}
if (num2 == 0)
{
num2 = 1;
}
Image image2 = new Bitmap(num, num2);
if (thumbsMode == ThumbsMode.AddBackColor)
{
image2 = new Bitmap(width, height);
}
Graphics graphics = Graphics.FromImage(image2);
graphics.InterpolationMode = InterpolationMode.High;
graphics.SmoothingMode = SmoothingMode.HighQuality;
if ((thumbsMode == ThumbsMode.AddBackColor) && !string.IsNullOrEmpty(bgColor))
{
ColorConverter converter = new ColorConverter();
Color color = (Color)converter.ConvertFromString(bgColor);
graphics.Clear(color);
}
else
{
graphics.Clear(Color.Transparent);
}
if (thumbsMode == ThumbsMode.AddBackColor)
{
graphics.DrawImage(image, new Rectangle(x, y, num, num2), new Rectangle(0, 0, image.Width, image.Height), GraphicsUnit.Pixel);
}
else
{
graphics.DrawImage(image, new Rectangle(0, 0, num, num2), new Rectangle(x, y, num5, num6), GraphicsUnit.Pixel);
}
try
{
image2.Save(thumbnailPath, ImageFormat.Jpeg);
}
catch
{
throw new ExternalException("该图像以错误的图像格式保存。- 或 - 该图像被保存到创建该图像的文件");
}
finally
{
image.Dispose();
image2.Dispose();
graphics.Dispose();
}
}
