/// <summary>
/// 创建缩略图
/// </summary>
/// <param name="oldFilePath">旧文件地址</param>
/// <param name="newFilePath">新文件地址</param>
public void CreatedImg(string oldFilePath, string newFilePath)
{
System.Drawing.Image originImage = System.Drawing.Image.FromFile(oldFilePath);
int toWidth = 210;
int toHeight = 0;
int x = 0;
int y = 0;
int ow = originImage.Width;
int oh = originImage.Height;
switch ("W")
{
case "HW":
break;
case "W":
toHeight = oh * toWidth / ow;
break;
case "H":
toWidth = ow * toHeight / oh;
break;
case "Cut":
break;
default:
break;
}
System.Drawing.Image bitmap = new Bitmap(toWidth, toHeight);
Graphics g = Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.Clear(Color.Transparent);
g.DrawImage(originImage, new Rectangle(0, 0, toWidth, toHeight), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel);
string path = Server.MapPath("https://files.cnblogs.com/ThumbnailsImage");
try
{
bitmap.Save(path + "/" + newFilePath);
}
catch
{
bitmap.Save(path + "/" + newFilePath,ImageFormat.Jpeg);
}
finally
{
originImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}